__fput+0x212/0x8c0 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x635/0x2110 kernel/exit.c:884
 do_group_exit+0x12c/0x2f0 kernel/exit.c:998
 get_signal+0x7eb/0x12e0 kernel/signal.c:2901
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
------------[ cut here ]------------
kernel BUG at mm/filemap.c:166!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4541 Comm: syz.0.76 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:unaccount_page_cache_page+0x74d/0x860 mm/filemap.c:166
Code: e8 c8 17 db ff 4c 89 f7 48 c7 c6 20 02 33 8a e8 c9 fc 0d 00 0f 0b e8 b2 17 db ff 4c 89 f7 48 c7 c6 60 02 33 8a e8 b3 fc 0d 00 <0f> 0b 48 85 ed 75 59 e8 97 17 db ff eb 5d e8 90 17 db ff 4c 89 f7
RSP: 0018:ffffc9000335f6e8 EFLAGS: 00010046
RAX: dac15ddfb0d10d00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff5200066bed0
RBP: ffffea00015cf408 R08: ffffc9000335ee07 R09: fffff5200066be8c
R10: dffffc0000000000 R11: fffff5200066bdc1 R12: ffffea00015cf400
R13: dffffc0000000000 R14: ffffea00015cf400 R15: 1ffffd40002b9e81
FS:  00005555602dc500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000002380e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __delete_from_page_cache+0xbc/0x6c0 mm/filemap.c:231
 delete_from_page_cache+0x121/0x190 mm/filemap.c:266
 truncate_inode_page+0x8d/0xb0 mm/truncate.c:219
 shmem_undo_range+0x4f4/0x19a0 mm/shmem.c:960
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x1e2/0x9a0 mm/shmem.c:1145
 evict+0x4b6/0x8b0 fs/inode.c:647
 __dentry_kill+0x412/0x630 fs/dcache.c:586
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xd8/0x1a0 fs/dcache.c:893
 __fput+0x5a5/0x8c0 fs/file_table.c:319
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f232ea88e99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa6a2a998 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fffa6a2aa80 RCX: 00007f232ea88e99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000151b9 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b31520000 R11: 0000000000000246 R12: 00007fffa6a2aac0
R13: 00007f232ed10fac R14: 0000000000015223 R15: 00007f232ed10fa0
 </TASK>
Modules linked in:
---[ end trace 9b14451c8e1c4dc8 ]---
RIP: 0010:unaccount_page_cache_page+0x74d/0x860 mm/filemap.c:166
Code: e8 c8 17 db ff 4c 89 f7 48 c7 c6 20 02 33 8a e8 c9 fc 0d 00 0f 0b e8 b2 17 db ff 4c 89 f7 48 c7 c6 60 02 33 8a e8 b3 fc 0d 00 <0f> 0b 48 85 ed 75 59 e8 97 17 db ff eb 5d e8 90 17 db ff 4c 89 f7
RSP: 0018:ffffc9000335f6e8 EFLAGS: 00010046
RAX: dac15ddfb0d10d00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff5200066bed0
RBP: ffffea00015cf408 R08: ffffc9000335ee07 R09: fffff5200066be8c
R10: dffffc0000000000 R11: fffff5200066bdc1 R12: ffffea00015cf400
R13: dffffc0000000000 R14: ffffea00015cf400 R15: 1ffffd40002b9e81
FS:  00005555602dc500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000002380e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400