==================================================================
BUG: KASAN: slab-out-of-bounds in iov_iter_revert lib/iov_iter.c:633 [inline]
BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
Read of size 4 at addr ffff88803515b078 by task kworker/u8:7/4049
CPU: 0 UID: 0 PID: 4049 Comm: kworker/u8:7 Not tainted 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iov_iter_revert lib/iov_iter.c:633 [inline]
iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iov_iter_revert lib/iov_iter.c:633 [inline]
BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x521/0x5a0 lib/iov_iter.c:611
Read of size 4 at addr ffff88803515b068 by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iov_iter_revert lib/iov_iter.c:633 [inline]
iov_iter_revert+0x521/0x5a0 lib/iov_iter.c:611
netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iov_iter_bvec_advance lib/iov_iter.c:504 [inline]
BUG: KASAN: slab-out-of-bounds in iov_iter_advance+0x652/0x6c0 lib/iov_iter.c:576
Read of size 4 at addr ffff88803515b068 by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iov_iter_bvec_advance lib/iov_iter.c:504 [inline]
iov_iter_advance+0x652/0x6c0 lib/iov_iter.c:576
netfs_reissue_write+0x13d/0x240 fs/netfs/write_issue.c:250
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iov_iter_bvec_advance lib/iov_iter.c:504 [inline]
BUG: KASAN: slab-out-of-bounds in iov_iter_advance+0x652/0x6c0 lib/iov_iter.c:576
Read of size 4 at addr ffff88803515b078 by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iov_iter_bvec_advance lib/iov_iter.c:504 [inline]
iov_iter_advance+0x652/0x6c0 lib/iov_iter.c:576
netfs_reissue_write+0x13d/0x240 fs/netfs/write_issue.c:250
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:117 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x132f/0x15b0 lib/iov_iter.c:260
Read of size 4 at addr ffff88803515b06c by task kworker/u8:7/4049
CPU: 0 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:117 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x132f/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 12 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:118 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x1447/0x15b0 lib/iov_iter.c:260
Read of size 8 at addr ffff88803515b060 by task kworker/u8:7/4049
CPU: 0 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:118 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x1447/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:120 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x1459/0x15b0 lib/iov_iter.c:260
Read of size 4 at addr ffff88803515b068 by task kworker/u8:7/4049
CPU: 0 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:120 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x1459/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: wild-memory-access in memcpy_from_iter lib/iov_iter.c:73 [inline]
BUG: KASAN: wild-memory-access in iterate_bvec include/linux/iov_iter.h:123 [inline]
BUG: KASAN: wild-memory-access in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: wild-memory-access in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: wild-memory-access in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: wild-memory-access in _copy_from_iter+0x8c9/0x15b0 lib/iov_iter.c:260
Read of size 427 at addr 18057a000489d01b by task kworker/u8:7/4049
CPU: 0 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
kasan_report+0xe0/0x110 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
__asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
memcpy_from_iter lib/iov_iter.c:73 [inline]
iterate_bvec include/linux/iov_iter.h:123 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x8c9/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:129 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x1416/0x15b0 lib/iov_iter.c:260
Read of size 4 at addr ffff88803515b068 by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:129 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x1416/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:117 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x132f/0x15b0 lib/iov_iter.c:260
Read of size 4 at addr ffff88803515b07c by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:117 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x132f/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 5987:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 0:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x2b6/0x4d0 mm/slub.c:4841
slab_free_after_rcu_debug+0x69/0x350 mm/slub.c:4679
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2824
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3082
slab_free_hook mm/slub.c:2344 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x173/0x4d0 mm/slub.c:4744
vma_complete+0x54d/0xe30 mm/vma.c:356
commit_merge+0x5e7/0x1020 mm/vma.c:711
vma_merge_existing_range+0xc50/0x1cd0 mm/vma.c:920
vma_modify+0x87/0x510 mm/vma.c:1564
vma_modify_flags+0x212/0x2d0 mm/vma.c:1605
mprotect_fixup+0x2b3/0xb10 mm/mprotect.c:658
do_mprotect_pkey+0x9ca/0xd50 mm/mprotect.c:832
__do_sys_mprotect mm/mprotect.c:853 [inline]
__se_sys_mprotect mm/mprotect.c:850 [inline]
__x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:850
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88803515b040
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes to the right of
allocated 32-byte region [ffff88803515b040, ffff88803515b060)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3515b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5235, tgid 5235 (v4l_id), ts 50065831119, free_ts 50064634938
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab mm/slub.c:2618 [inline]
new_slab+0x244/0x340 mm/slub.c:2672
___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2332 [inline]
slab_free mm/slub.c:4642 [inline]
kmem_cache_free+0x148/0x4d0 mm/slub.c:4744
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1379
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0x69d/0xff0 mm/page_alloc.c:2725
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xd5/0x4f0 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
__mmput+0x36c/0x410 kernel/fork.c:1390
mmput+0x62/0x70 kernel/fork.c:1401
exit_mm kernel/exit.c:589 [inline]
do_exit+0x9d1/0x2c30 kernel/exit.c:940
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88803515af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88803515af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803515b000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88803515b080: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88803515b100: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-out-of-bounds in iterate_bvec include/linux/iov_iter.h:118 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
BUG: KASAN: slab-out-of-bounds in iterate_and_advance include/linux/iov_iter.h:328 [inline]
BUG: KASAN: slab-out-of-bounds in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: slab-out-of-bounds in _copy_from_iter+0x1447/0x15b0 lib/iov_iter.c:260
Read of size 8 at addr ffff88803515b070 by task kworker/u8:7/4049
CPU: 1 UID: 0 PID: 4049 Comm: kworker/u8:7 Tainted: G B 6.15.0-rc5-syzkaller-00038-g707df3375124 #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xc3/0x670 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
iterate_bvec include/linux/iov_iter.h:118 [inline]
iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
iterate_and_advance include/linux/iov_iter.h:328 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
_copy_from_iter+0x1447/0x15b0 lib/iov_iter.c:260
copy_from_iter include/linux/uio.h:228 [inline]
copy_from_iter_full include/linux/uio.h:245 [inline]
pdu_write_u net/9p/protocol.c:234 [inline]
p9pdu_vwritef+0x2da/0x1d30 net/9p/protocol.c:614
p9_client_prepare_req+0x247/0x4d0 net/9p/client.c:651
p9_client_rpc+0x1c4/0xc50 net/9p/client.c:691
p9_client_write+0x245/0x6f0 net/9p/client.c:1648
v9fs_issue_write+0xe3/0x1b0 fs/9p/vfs_addr.c:59
netfs_do_issue_write+0x95/0x110 fs/netfs/write_issue.c:239
netfs_retry_write_stream fs/netfs/write_retry.c:46 [inline]
netfs_retry_writes+0x168a/0x1a50 fs/netfs/write_retry.c:231