==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: use-after-free in __run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881e2f5f1c8 by task syz.5.198/1245
CPU: 0 PID: 1245 Comm: syz.5.198 Not tainted 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d8/0x241 lib/dump_stack.c:118
print_address_description+0x8c/0x600 mm/kasan/report.c:384
__kasan_report+0xf3/0x120 mm/kasan/report.c:516
kasan_report+0x30/0x60 mm/kasan/common.c:653
__hlist_del include/linux/list.h:791 [inline]
detach_timer kernel/time/timer.c:824 [inline]
expire_timers kernel/time/timer.c:1482 [inline]
__run_timers+0x7be/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:__read_once_size include/linux/compiler.h:268 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:174 [inline]
RIP: 0010:PageAnon include/linux/page-flags.h:463 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1095 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1222 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1251 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1272 [inline]
RIP: 0010:unmap_page_range+0xe26/0x2620 mm/memory.c:1293
Code: 48 8b 54 24 18 0f 85 47 08 00 00 80 0a 08 4d 85 ff 0f 84 37 07 00 00 4c 89 e0 4d 8d 67 08 4d 89 e6 49 c1 ee 03 41 80 3c 06 00 <74> 08 4c 89 e7 e8 f0 58 09 00 49 8b 1c 24 89 de 83 e6 01 31 ff e8
RSP: 0018:ffff8881e3d7f5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffffffffffffffff RCX: dffffc0000000000
RDX: ffff8881e3d7f920 RSI: 0000000000000001 RDI: ffff8881e3d7f918
RBP: ffff8881e3d7f790 R08: ffffffff818ada5b R09: ffffed103c5299d9
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea00079c7008
R13: ffff8881e3cd9048 R14: 1ffffd4000f38e01 R15: ffffea00079c7000
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x355/0x4b0 mm/memory.c:1370
exit_mmap+0x2bc/0x520 mm/mmap.c:3191
__mmput+0x8e/0x2c0 kernel/fork.c:1101
exit_mm kernel/exit.c:538 [inline]
do_exit+0xc08/0x2bc0 kernel/exit.c:848
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7ff98c837169
Code: Bad RIP value.
RSP: 002b:00007ff98ae80038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: 0000000000000005 RBX: 00007ff98ca50080 RCX: 00007ff98c837169
RDX: 0000000000200002 RSI: 0000400000000100 RDI: ffffffffffffff9c
RBP: 00007ff98c8b82a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff98ca50080 R15: 00007ffe32aa84d8
Allocated by task 1269:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
__kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
slab_post_alloc_hook mm/slab.h:584 [inline]
slab_alloc_node mm/slub.c:2829 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:966
new_inode+0x25/0x1d0 fs/inode.c:995
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_mknod+0x54/0x1a0 mm/shmem.c:2844
lookup_open fs/namei.c:3379 [inline]
do_last fs/namei.c:3471 [inline]
path_openat+0x184a/0x34b0 fs/namei.c:3683
do_filp_open+0x20b/0x450 fs/namei.c:3713
do_sys_open+0x39c/0x810 fs/open.c:1123
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Freed by task 10:
save_stack mm/kasan/common.c:70 [inline]
set_track mm/kasan/common.c:78 [inline]
kasan_set_free_info mm/kasan/common.c:345 [inline]
__kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
slab_free_hook mm/slub.c:1455 [inline]
slab_free_freelist_hook mm/slub.c:1494 [inline]
slab_free mm/slub.c:3080 [inline]
kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
__rcu_reclaim kernel/rcu/rcu.h:222 [inline]
rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167
rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
The buggy address belongs to the object at ffff8881e2f5f090
which belongs to the cache shmem_inode_cache of size 760
The buggy address is located 312 bytes inside of
760-byte region [ffff8881e2f5f090, ffff8881e2f5f388)
The buggy address belongs to the page:
page:ffffea00078bd700 refcount:1 mapcount:0 mapping:ffff8881f5cff180 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cff180
raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook mm/page_alloc.c:2165 [inline]
prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
__alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
alloc_slab_page+0x39/0x3c0 mm/slub.c:343
allocate_slab mm/slub.c:1683 [inline]
new_slab+0x97/0x440 mm/slub.c:1749
new_slab_objects mm/slub.c:2505 [inline]
___slab_alloc+0x2fe/0x490 mm/slub.c:2667
__slab_alloc+0x62/0xa0 mm/slub.c:2707
slab_alloc_node mm/slub.c:2792 [inline]
slab_alloc mm/slub.c:2837 [inline]
kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
shmem_alloc_inode+0x16/0x30 mm/shmem.c:3719
alloc_inode fs/inode.c:231 [inline]
new_inode_pseudo+0x60/0x210 fs/inode.c:966
new_inode+0x25/0x1d0 fs/inode.c:995
shmem_get_inode+0x10b/0x620 mm/shmem.c:2252
shmem_symlink+0x118/0x5f0 mm/shmem.c:3068
vfs_symlink+0x36c/0x500 fs/namei.c:4276
do_symlinkat+0x19b/0x400 fs/namei.c:4303
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1176 [inline]
__free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
free_the_page mm/page_alloc.c:4955 [inline]
__free_pages+0x91/0x140 mm/page_alloc.c:4961
device_release+0x6b/0x190 drivers/base/core.c:1776
kobject_cleanup lib/kobject.c:716 [inline]
kobject_release lib/kobject.c:747 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1e6/0x2f0 lib/kobject.c:764
netdev_run_todo+0xc44/0xdf0 net/core/dev.c:9488
tun_detach drivers/net/tun.c:766 [inline]
tun_chr_close+0xc1/0x130 drivers/net/tun.c:3563
__fput+0x262/0x680 fs/file_table.c:281
task_work_run+0x140/0x170 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xcaf/0x2bc0 kernel/exit.c:861
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Memory state around the buggy address:
ffff8881e2f5f080: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e2f5f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881e2f5f180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881e2f5f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881e2f5f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e3f97067 P4D 1e3f97067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1245 Comm: syz.5.198 Tainted: G B 5.4.290-syzkaller-00017-g6b07fcd94a6a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010002
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881e294cec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e2f5f1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffaa80
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e2f5f1c0
FS: 00007ff98ae806c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec218000 CR4: 00000000003406b0
DR0: 0000400000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
expire_timers kernel/time/timer.c:1488 [inline]
__run_timers+0x8a5/0xbe0 kernel/time/timer.c:1817
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
__do_softirq+0x23b/0x6b7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x195/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:539 [inline]
smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
RIP: 0010:__read_once_size include/linux/compiler.h:268 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:174 [inline]
RIP: 0010:PageAnon include/linux/page-flags.h:463 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1095 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1222 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1251 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1272 [inline]
RIP: 0010:unmap_page_range+0xe26/0x2620 mm/memory.c:1293
Code: 48 8b 54 24 18 0f 85 47 08 00 00 80 0a 08 4d 85 ff 0f 84 37 07 00 00 4c 89 e0 4d 8d 67 08 4d 89 e6 49 c1 ee 03 41 80 3c 06 00 <74> 08 4c 89 e7 e8 f0 58 09 00 49 8b 1c 24 89 de 83 e6 01 31 ff e8
RSP: 0018:ffff8881e3d7f5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffffffffffffffff RCX: dffffc0000000000
RDX: ffff8881e3d7f920 RSI: 0000000000000001 RDI: ffff8881e3d7f918
RBP: ffff8881e3d7f790 R08: ffffffff818ada5b R09: ffffed103c5299d9
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea00079c7008
R13: ffff8881e3cd9048 R14: 1ffffd4000f38e01 R15: ffffea00079c7000
unmap_single_vma mm/memory.c:1338 [inline]
unmap_vmas+0x355/0x4b0 mm/memory.c:1370
exit_mmap+0x2bc/0x520 mm/mmap.c:3191
__mmput+0x8e/0x2c0 kernel/fork.c:1101
exit_mm kernel/exit.c:538 [inline]
do_exit+0xc08/0x2bc0 kernel/exit.c:848
do_group_exit+0x138/0x300 kernel/exit.c:984
get_signal+0xdb1/0x1440 kernel/signal.c:2738
do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7ff98c837169
Code: Bad RIP value.
RSP: 002b:00007ff98ae80038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: 0000000000000005 RBX: 00007ff98ca50080 RCX: 00007ff98c837169
RDX: 0000000000200002 RSI: 0000400000000100 RDI: ffffffffffffff9c
RBP: 00007ff98c8b82a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff98ca50080 R15: 00007ffe32aa84d8
Modules linked in:
CR2: 0000000000000000
---[ end trace 5fb542db20ee0d98 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d18 EFLAGS: 00010002
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881e294cec0
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e2f5f1c0
RBP: ffff8881f6e09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffaa80
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e2f5f1c0
FS: 00007ff98ae806c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec218000 CR4: 00000000003406b0
DR0: 0000400000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 48 8b 54 24 18 mov 0x18(%rsp),%rdx
5: 0f 85 47 08 00 00 jne 0x852
b: 80 0a 08 orb $0x8,(%rdx)
e: 4d 85 ff test %r15,%r15
11: 0f 84 37 07 00 00 je 0x74e
17: 4c 89 e0 mov %r12,%rax
1a: 4d 8d 67 08 lea 0x8(%r15),%r12
1e: 4d 89 e6 mov %r12,%r14
21: 49 c1 ee 03 shr $0x3,%r14
25: 41 80 3c 06 00 cmpb $0x0,(%r14,%rax,1)
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 4c 89 e7 mov %r12,%rdi
2f: e8 f0 58 09 00 call 0x95924
34: 49 8b 1c 24 mov (%r12),%rbx
38: 89 de mov %ebx,%esi
3a: 83 e6 01 and $0x1,%esi
3d: 31 ff xor %edi,%edi
3f: e8 .byte 0xe8