do_exit+0x5a1/0x20a0 kernel/exit.c:870
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 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
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
------------[ cut here ]------------
kernel BUG at mm/filemap.c:166!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9020 Comm: syz.4.1001 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166
Code: e8 39 70 db ff 4c 89 f7 48 c7 c6 20 e8 12 8a e8 7a db 0d 00 0f 0b e8 23 70 db ff 4c 89 f7 48 c7 c6 60 e8 12 8a e8 64 db 0d 00 <0f> 0b 48 85 ed 75 59 e8 08 70 db ff eb 5d e8 01 70 db ff 4c 89 f7
RSP: 0018:ffffc9000325f228 EFLAGS: 00010046
RAX: 3f957667ef91eb00 RBX: 0000000000000000 RCX: ffff8880283b0000
RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff
RBP: 1ffffd40002f5e21 R08: dffffc0000000000 R09: fffff5200064bd29
R10: fffff5200064bd29 R11: 1ffff9200064bd28 R12: ffffea00017af100
R13: dffffc0000000000 R14: ffffea00017af100 R15: ffffea00017af108
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c41a895 CR3: 000000000be8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __delete_from_page_cache+0xbf/0x6b0 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+0x4dc/0x1880 mm/shmem.c:960
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x20d/0xa00 mm/shmem.c:1145
 evict+0x485/0x870 fs/inode.c:647
 __dentry_kill+0x431/0x650 fs/dcache.c:586
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xd8/0x1a0 fs/dcache.c:893
 __fput+0x5ee/0x930 fs/file_table.c:319
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x61e/0x20a0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 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
 __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: 0033:0x7fb66fe60ba9
Code: Unable to access opcode bytes at RIP 0x7fb66fe60b7f.
RSP: 002b:00007fb66e0860e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fb6700a8188 RCX: 00007fb66fe60ba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb6700a8188
RBP: 00007fb6700a8180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6700a8218 R14: 00007ffd5c2574a0 R15: 00007ffd5c257588
 </TASK>
Modules linked in:
---[ end trace 8673b939deea3868 ]---
RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166
Code: e8 39 70 db ff 4c 89 f7 48 c7 c6 20 e8 12 8a e8 7a db 0d 00 0f 0b e8 23 70 db ff 4c 89 f7 48 c7 c6 60 e8 12 8a e8 64 db 0d 00 <0f> 0b 48 85 ed 75 59 e8 08 70 db ff eb 5d e8 01 70 db ff 4c 89 f7
RSP: 0018:ffffc9000325f228 EFLAGS: 00010046
RAX: 3f957667ef91eb00 RBX: 0000000000000000 RCX: ffff8880283b0000
RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff
RBP: 1ffffd40002f5e21 R08: dffffc0000000000 R09: fffff5200064bd29
R10: fffff5200064bd29 R11: 1ffff9200064bd28 R12: ffffea00017af100
R13: dffffc0000000000 R14: ffffea00017af100 R15: ffffea00017af108
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c41a895 CR3: 000000000be8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400