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
------------[ cut here ]------------
kernel BUG at mm/filemap.c:166!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8269 Comm: syz.4.1091 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:unaccount_page_cache_page+0x74d/0x860 mm/filemap.c:166
Code: e8 58 1a db ff 4c 89 f7 48 c7 c6 40 01 33 8a e8 c9 fc 0d 00 0f 0b e8 42 1a db ff 4c 89 f7 48 c7 c6 80 01 33 8a e8 b3 fc 0d 00 <0f> 0b 48 85 ed 75 59 e8 27 1a db ff eb 5d e8 20 1a db ff 4c 89 f7
RSP: 0018:ffffc900032cf5e8 EFLAGS: 00010046
RAX: 9e5541a3c8905f00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff52000659eb0
RBP: ffffea0001a14d48 R08: ffff8880b902795b R09: fffff52000659e6c
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffffea0001a14d40
R13: dffffc0000000000 R14: ffffea0001a14d40 R15: 1ffffd40003429a9
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056178ae13138 CR3: 000000002a548000 CR4: 00000000003526f0
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
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x635/0x2110 kernel/exit.c:884
 __do_sys_exit kernel/exit.c:967 [inline]
 __se_sys_exit kernel/exit.c:965 [inline]
 __x64_sys_exit+0x3c/0x40 kernel/exit.c:965
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8c8936fe59
Code: Unable to access opcode bytes at RIP 0x7f8c8936fe2f.
RSP: 002b:00007f8c875a7fd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f8c895e9090 RCX: 00007f8c8936fe59
RDX: 00007f8c875a89c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8c89405e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c895e9128 R14: 00007f8c895e9090 R15: 00007ffe05c34728
 </TASK>
Modules linked in:
---[ end trace d4435360f4731bfd ]---
RIP: 0010:unaccount_page_cache_page+0x74d/0x860 mm/filemap.c:166
Code: e8 58 1a db ff 4c 89 f7 48 c7 c6 40 01 33 8a e8 c9 fc 0d 00 0f 0b e8 42 1a db ff 4c 89 f7 48 c7 c6 80 01 33 8a e8 b3 fc 0d 00 <0f> 0b 48 85 ed 75 59 e8 27 1a db ff eb 5d e8 20 1a db ff 4c 89 f7
RSP: 0018:ffffc900032cf5e8 EFLAGS: 00010046
RAX: 9e5541a3c8905f00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff52000659eb0
RBP: ffffea0001a14d48 R08: ffff8880b902795b R09: fffff52000659e6c
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffffea0001a14d40
R13: dffffc0000000000 R14: ffffea0001a14d40 R15: 1ffffd40003429a9
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056178ae13138 CR3: 000000002a548000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400