syzbot

 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
------------[ cut here ]------------
kernel BUG at mm/filemap.c:166!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4335 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166
Code: e8 89 6f db ff 4c 89 f7 48 c7 c6 00 f5 12 8a e8 7a da 0d 00 0f 0b e8 73 6f db ff 4c 89 f7 48 c7 c6 40 f5 12 8a e8 64 da 0d 00 <0f> 0b 48 85 ed 75 59 e8 58 6f db ff eb 5d e8 51 6f db ff 4c 89 f7
RSP: 0018:ffffc90002f1f688 EFLAGS: 00010046
RAX: 41aed79997eea800 RBX: 0000000000000000 RCX: ffff888025f93b80
RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff
RBP: 1ffffd4000355d51 R08: dffffc0000000000 R09: ffffed1017224f2c
R10: ffffed1017224f2c R11: 1ffff11017224f2b R12: ffffea0001aaea80
R13: dffffc0000000000 R14: ffffea0001aaea80 R15: ffffea0001aaea88
FS:  000055555b928500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000005e08a000 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
 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: 0033:0x7fcc55e82749
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:00007ffcf6a4cdd8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000146fa RCX: 00007fcc55e82749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000007f6a4d0cf
R10: 0000001b2fa20000 R11: 0000000000000246 R12: 00007fcc560d8fac
R13: 00007fcc560d8fa0 R14: ffffffffffffffff R15: 0000000000000003
 </TASK>
Modules linked in:
---[ end trace ae4d78c9ae31cfae ]---
RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166
Code: e8 89 6f db ff 4c 89 f7 48 c7 c6 00 f5 12 8a e8 7a da 0d 00 0f 0b e8 73 6f db ff 4c 89 f7 48 c7 c6 40 f5 12 8a e8 64 da 0d 00 <0f> 0b 48 85 ed 75 59 e8 58 6f db ff eb 5d e8 51 6f db ff 4c 89 f7
RSP: 0018:ffffc90002f1f688 EFLAGS: 00010046
RAX: 41aed79997eea800 RBX: 0000000000000000 RCX: ffff888025f93b80
RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff
RBP: 1ffffd4000355d51 R08: dffffc0000000000 R09: ffffed1017224f2c
R10: ffffed1017224f2c R11: 1ffff11017224f2b R12: ffffea0001aaea80
R13: dffffc0000000000 R14: ffffea0001aaea80 R15: ffffea0001aaea88
FS:  000055555b928500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000280 CR3: 000000005e08a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400