unmap_vmas+0x131/0x250 mm/memory.c:1653
 exit_mmap+0x3b9/0x640 mm/mmap.c:3216
 __mmput+0x115/0x390 kernel/fork.c:1128
 exit_mm+0x632/0x7b0 kernel/exit.c:551
 do_exit+0x5b8/0x2110 kernel/exit.c:871
 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
 __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: 0 PID: 4645 Comm: syz.4.115 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:ffffc9000341f268 EFLAGS: 00010046
RAX: d8319b50c65b1b00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff52000683e40
RBP: ffffea00013d9ac8 R08: ffff8880b902795b R09: fffff52000683dfc
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffffea00013d9ac0
R13: dffffc0000000000 R14: ffffea00013d9ac0 R15: 1ffffd400027b359
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32fb8ab6b0 CR3: 000000005f9a6000 CR4: 00000000003506f0
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_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
 __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: 0033:0x7f37784abe99
Code: Unable to access opcode bytes at RIP 0x7f37784abe6f.
RSP: 002b:00007f37767040e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3778733fa8 RCX: 00007f37784abe99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3778733fa8
RBP: 00007f3778733fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3778734038 R14: 00007ffc0b9f5b20 R15: 00007ffc0b9f5c08
 </TASK>
Modules linked in:
---[ end trace 9b59533efd0b1a46 ]---
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:ffffc9000341f268 EFLAGS: 00010046
RAX: d8319b50c65b1b00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff52000683e40
RBP: ffffea00013d9ac8 R08: ffff8880b902795b R09: fffff52000683dfc
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffffea00013d9ac0
R13: dffffc0000000000 R14: ffffea00013d9ac0 R15: 1ffffd400027b359
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32fb8ab6b0 CR3: 000000005f9a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400