==================================================================
BUG: KASAN: slab-use-after-free in __list_lru_walk_one+0x40f/0x4c0 mm/list_lru.c:293
Read of size 8 at addr ffff88804c08f078 by task syz.4.967/10051
CPU: 0 UID: 0 PID: 10051 Comm: syz.4.967 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
__list_lru_walk_one+0x40f/0x4c0 mm/list_lru.c:293
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:341
list_lru_shrink_walk include/linux/list_lru.h:262 [inline]
gfs2_qd_shrink_scan+0x12a/0x330 fs/gfs2/quota.c:182
do_shrink_slab+0x42e/0x1130 mm/shrinker.c:437
shrink_slab+0x32a/0x12b0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:434 [inline]
drop_slab+0x14f/0x2d0 mm/vmscan.c:452
drop_caches_sysctl_handler fs/drop_caches.c:68 [inline]
drop_caches_sysctl_handler+0x171/0x190 fs/drop_caches.c:51
proc_sys_call_handler+0x493/0x5b0 fs/proc/proc_sysctl.c:600
do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
vfs_writev+0x35f/0xde0 fs/read_write.c:1057
do_writev+0x132/0x340 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfbbb8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcfbc9b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fcfbbde6180 RCX: 00007fcfbbb8f749
RDX: 0000000000000001 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007fcfbbc13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcfbbde6218 R14: 00007fcfbbde6180 R15: 00007ffec7ad8228
Allocated by task 8156:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857
handle_softirqs+0x219/0x950 kernel/softirq.c:622
run_ksoftirqd kernel/softirq.c:1063 [inline]
run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3119
qd_put+0x153/0x190 fs/gfs2/quota.c:337
qd_ungrab_sync fs/gfs2/quota.c:493 [inline]
gfs2_quota_sync+0x417/0x570 fs/gfs2/quota.c:1351
gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:658
sync_filesystem fs/sync.c:56 [inline]
sync_filesystem+0x111/0x290 fs/sync.c:30
generic_shutdown_super+0x74/0x390 fs/super.c:622
kill_block_super+0x3b/0x90 fs/super.c:1722
gfs2_kill_sb+0x4ab/0x590 fs/gfs2/ops_fstype.c:1797
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1318
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88804c08f000
which belongs to the cache gfs2_quotad of size 272
The buggy address is located 120 bytes inside of
freed 272-byte region [ffff88804c08f000, ffff88804c08f110)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c08f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888143ea5140 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6707, tgid 6706 (syz.1.187), ts 155857836842, free_ts 36001720921
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1857
prep_new_page mm/page_alloc.c:1865 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c3/0x430 mm/slub.c:3302
___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
__free_pages mm/page_alloc.c:5329 [inline]
free_contig_range+0x183/0x4a0 mm/page_alloc.c:7197
destroy_args+0xb95/0x14e0 mm/debug_vm_pgtable.c:983
debug_vm_pgtable+0x2220/0x38d0 mm/debug_vm_pgtable.c:1372
do_one_initcall+0x123/0x680 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x5c8/0x920 init/main.c:1688
kernel_init+0x1c/0x2b0 init/main.c:1578
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Memory state around the buggy address:
ffff88804c08ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804c08ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c08f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804c08f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804c08f100: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_trylock+0x65/0x180 kernel/locking/spinlock_debug.c:123
Read of size 4 at addr ffff88804c08f030 by task syz.4.967/10051
CPU: 0 UID: 0 PID: 10051 Comm: syz.4.967 Tainted: G B L syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:194 [inline]
kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
do_raw_spin_trylock+0x65/0x180 kernel/locking/spinlock_debug.c:123
__raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline]
_raw_spin_trylock+0x1b/0x80 kernel/locking/spinlock.c:138
spin_trylock include/linux/spinlock.h:361 [inline]
gfs2_qd_isolate+0x2e/0xd0 fs/gfs2/quota.c:159
__list_lru_walk_one+0x14f/0x4c0 mm/list_lru.c:304
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:341
list_lru_shrink_walk include/linux/list_lru.h:262 [inline]
gfs2_qd_shrink_scan+0x12a/0x330 fs/gfs2/quota.c:182
do_shrink_slab+0x42e/0x1130 mm/shrinker.c:437
shrink_slab+0x32a/0x12b0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:434 [inline]
drop_slab+0x14f/0x2d0 mm/vmscan.c:452
drop_caches_sysctl_handler fs/drop_caches.c:68 [inline]
drop_caches_sysctl_handler+0x171/0x190 fs/drop_caches.c:51
proc_sys_call_handler+0x493/0x5b0 fs/proc/proc_sysctl.c:600
do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
vfs_writev+0x35f/0xde0 fs/read_write.c:1057
do_writev+0x132/0x340 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfbbb8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcfbc9b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fcfbbde6180 RCX: 00007fcfbbb8f749
RDX: 0000000000000001 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007fcfbbc13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcfbbde6218 R14: 00007fcfbbde6180 R15: 00007ffec7ad8228
Allocated by task 8156:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857
handle_softirqs+0x219/0x950 kernel/softirq.c:622
run_ksoftirqd kernel/softirq.c:1063 [inline]
run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3119
qd_put+0x153/0x190 fs/gfs2/quota.c:337
qd_ungrab_sync fs/gfs2/quota.c:493 [inline]
gfs2_quota_sync+0x417/0x570 fs/gfs2/quota.c:1351
gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:658
sync_filesystem fs/sync.c:56 [inline]
sync_filesystem+0x111/0x290 fs/sync.c:30
generic_shutdown_super+0x74/0x390 fs/super.c:622
kill_block_super+0x3b/0x90 fs/super.c:1722
gfs2_kill_sb+0x4ab/0x590 fs/gfs2/ops_fstype.c:1797
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1318
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88804c08f000
which belongs to the cache gfs2_quotad of size 272
The buggy address is located 48 bytes inside of
freed 272-byte region [ffff88804c08f000, ffff88804c08f110)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c08f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888143ea5140 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6707, tgid 6706 (syz.1.187), ts 155857836842, free_ts 36001720921
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1857
prep_new_page mm/page_alloc.c:1865 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c3/0x430 mm/slub.c:3302
___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
__free_pages mm/page_alloc.c:5329 [inline]
free_contig_range+0x183/0x4a0 mm/page_alloc.c:7197
destroy_args+0xb95/0x14e0 mm/debug_vm_pgtable.c:983
debug_vm_pgtable+0x2220/0x38d0 mm/debug_vm_pgtable.c:1372
do_one_initcall+0x123/0x680 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x5c8/0x920 init/main.c:1688
kernel_init+0x1c/0x2b0 init/main.c:1578
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Memory state around the buggy address:
ffff88804c08ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804c08ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c08f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804c08f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804c08f100: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
BUG: KASAN: slab-use-after-free in raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
BUG: KASAN: slab-use-after-free in queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_trylock+0x162/0x180 kernel/locking/spinlock_debug.c:123
Read of size 4 at addr ffff88804c08f030 by task syz.4.967/10051
CPU: 0 UID: 0 PID: 10051 Comm: syz.4.967 Tainted: G B L syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
queued_spin_trylock include/asm-generic/qspinlock.h:92 [inline]
do_raw_spin_trylock+0x162/0x180 kernel/locking/spinlock_debug.c:123
__raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline]
_raw_spin_trylock+0x1b/0x80 kernel/locking/spinlock.c:138
spin_trylock include/linux/spinlock.h:361 [inline]
gfs2_qd_isolate+0x2e/0xd0 fs/gfs2/quota.c:159
__list_lru_walk_one+0x14f/0x4c0 mm/list_lru.c:304
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:341
list_lru_shrink_walk include/linux/list_lru.h:262 [inline]
gfs2_qd_shrink_scan+0x12a/0x330 fs/gfs2/quota.c:182
do_shrink_slab+0x42e/0x1130 mm/shrinker.c:437
shrink_slab+0x32a/0x12b0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:434 [inline]
drop_slab+0x14f/0x2d0 mm/vmscan.c:452
drop_caches_sysctl_handler fs/drop_caches.c:68 [inline]
drop_caches_sysctl_handler+0x171/0x190 fs/drop_caches.c:51
proc_sys_call_handler+0x493/0x5b0 fs/proc/proc_sysctl.c:600
do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
vfs_writev+0x35f/0xde0 fs/read_write.c:1057
do_writev+0x132/0x340 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfbbb8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcfbc9b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fcfbbde6180 RCX: 00007fcfbbb8f749
RDX: 0000000000000001 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007fcfbbc13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcfbbde6218 R14: 00007fcfbbde6180 R15: 00007ffec7ad8228
Allocated by task 8156:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857
handle_softirqs+0x219/0x950 kernel/softirq.c:622
run_ksoftirqd kernel/softirq.c:1063 [inline]
run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3119
qd_put+0x153/0x190 fs/gfs2/quota.c:337
qd_ungrab_sync fs/gfs2/quota.c:493 [inline]
gfs2_quota_sync+0x417/0x570 fs/gfs2/quota.c:1351
gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:658
sync_filesystem fs/sync.c:56 [inline]
sync_filesystem+0x111/0x290 fs/sync.c:30
generic_shutdown_super+0x74/0x390 fs/super.c:622
kill_block_super+0x3b/0x90 fs/super.c:1722
gfs2_kill_sb+0x4ab/0x590 fs/gfs2/ops_fstype.c:1797
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1318
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88804c08f000
which belongs to the cache gfs2_quotad of size 272
The buggy address is located 48 bytes inside of
freed 272-byte region [ffff88804c08f000, ffff88804c08f110)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c08f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888143ea5140 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6707, tgid 6706 (syz.1.187), ts 155857836842, free_ts 36001720921
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1857
prep_new_page mm/page_alloc.c:1865 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c3/0x430 mm/slub.c:3302
___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
__free_pages mm/page_alloc.c:5329 [inline]
free_contig_range+0x183/0x4a0 mm/page_alloc.c:7197
destroy_args+0xb95/0x14e0 mm/debug_vm_pgtable.c:983
debug_vm_pgtable+0x2220/0x38d0 mm/debug_vm_pgtable.c:1372
do_one_initcall+0x123/0x680 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x5c8/0x920 init/main.c:1688
kernel_init+0x1c/0x2b0 init/main.c:1578
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Memory state around the buggy address:
ffff88804c08ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804c08ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c08f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804c08f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804c08f100: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: slab-use-after-free in atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
BUG: KASAN: slab-use-after-free in queued_spin_trylock include/asm-generic/qspinlock.h:97 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_trylock+0xa1/0x180 kernel/locking/spinlock_debug.c:123
Write of size 4 at addr ffff88804c08f030 by task syz.4.967/10051
CPU: 0 UID: 0 PID: 10051 Comm: syz.4.967 Tainted: G B L syzkaller #0 PREEMPT(full)
Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:194 [inline]
kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_trylock include/asm-generic/qspinlock.h:97 [inline]
do_raw_spin_trylock+0xa1/0x180 kernel/locking/spinlock_debug.c:123
__raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline]
_raw_spin_trylock+0x1b/0x80 kernel/locking/spinlock.c:138
spin_trylock include/linux/spinlock.h:361 [inline]
gfs2_qd_isolate+0x2e/0xd0 fs/gfs2/quota.c:159
__list_lru_walk_one+0x14f/0x4c0 mm/list_lru.c:304
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:341
list_lru_shrink_walk include/linux/list_lru.h:262 [inline]
gfs2_qd_shrink_scan+0x12a/0x330 fs/gfs2/quota.c:182
do_shrink_slab+0x42e/0x1130 mm/shrinker.c:437
shrink_slab+0x32a/0x12b0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:434 [inline]
drop_slab+0x14f/0x2d0 mm/vmscan.c:452
drop_caches_sysctl_handler fs/drop_caches.c:68 [inline]
drop_caches_sysctl_handler+0x171/0x190 fs/drop_caches.c:51
proc_sys_call_handler+0x493/0x5b0 fs/proc/proc_sysctl.c:600
do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
vfs_writev+0x35f/0xde0 fs/read_write.c:1057
do_writev+0x132/0x340 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfbbb8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcfbc9b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fcfbbde6180 RCX: 00007fcfbbb8f749
RDX: 0000000000000001 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007fcfbbc13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcfbbde6218 R14: 00007fcfbbde6180 R15: 00007ffec7ad8228
Allocated by task 8156:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x25e/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x2d8/0x770 mm/slub.c:6781
gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0x79c/0x15f0 kernel/rcu/tree.c:2857
handle_softirqs+0x219/0x950 kernel/softirq.c:622
run_ksoftirqd kernel/softirq.c:1063 [inline]
run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3119
qd_put+0x153/0x190 fs/gfs2/quota.c:337
qd_ungrab_sync fs/gfs2/quota.c:493 [inline]
gfs2_quota_sync+0x417/0x570 fs/gfs2/quota.c:1351
gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:658
sync_filesystem fs/sync.c:56 [inline]
sync_filesystem+0x111/0x290 fs/sync.c:30
generic_shutdown_super+0x74/0x390 fs/super.c:622
kill_block_super+0x3b/0x90 fs/super.c:1722
gfs2_kill_sb+0x4ab/0x590 fs/gfs2/ops_fstype.c:1797
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1318
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88804c08f000
which belongs to the cache gfs2_quotad of size 272
The buggy address is located 48 bytes inside of
freed 272-byte region [ffff88804c08f000, ffff88804c08f110)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c08f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888143ea5140 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6707, tgid 6706 (syz.1.187), ts 155857836842, free_ts 36001720921
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1857
prep_new_page mm/page_alloc.c:1865 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915
__alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0x2c3/0x430 mm/slub.c:3302
___slab_alloc+0xe18/0x1c90 mm/slub.c:4656
__slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
kmem_cache_alloc_noprof+0x44d/0x770 mm/slub.c:5270
qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
gfs2_quota_init+0x67a/0x13c0 fs/gfs2/quota.c:1448
gfs2_make_fs_rw+0x180/0x2d0 fs/gfs2/super.c:149
gfs2_fill_super+0x2bbd/0x2f90 fs/gfs2/ops_fstype.c:1275
get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691
gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x8e/0x330 fs/super.c:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7bf/0x23a0 fs/namespace.c:4022
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943
__free_pages mm/page_alloc.c:5329 [inline]
free_contig_range+0x183/0x4a0 mm/page_alloc.c:7197
destroy_args+0xb95/0x14e0 mm/debug_vm_pgtable.c:983
debug_vm_pgtable+0x2220/0x38d0 mm/debug_vm_pgtable.c:1372
do_one_initcall+0x123/0x680 init/main.c:1378
do_initcall_level init/main.c:1440 [inline]
do_initcalls init/main.c:1456 [inline]
do_basic_setup init/main.c:1475 [inline]
kernel_init_freeable+0x5c8/0x920 init/main.c:1688
kernel_init+0x1c/0x2b0 init/main.c:1578
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Memory state around the buggy address:
ffff88804c08ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804c08ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c08f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804c08f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804c08f100: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================