syzbot

 exit_mmap+0x343/0x8e0 mm/mmap.c:3258
 __mmput+0x118/0x3c0 kernel/fork.c:1200
 exit_mm+0x1e6/0x2c0 kernel/exit.c:565
 do_exit+0x8c1/0x2400 kernel/exit.c:867
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 __do_sys_exit_group kernel/exit.c:1033 [inline]
 __se_sys_exit_group kernel/exit.c:1031 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
------------[ cut here ]------------
kernel BUG at mm/filemap.c:153!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4434 Comm: syz.0.17 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:filemap_unaccount_folio+0x5cf/0xa80 mm/filemap.c:153
Code: 07 38 c1 0f 8c 19 fe ff ff 4c 89 e7 e8 0a 72 27 00 e9 0c fe ff ff e8 b0 55 d7 ff 48 89 df 48 c7 c6 00 eb 94 8a e8 a1 e1 11 00 <0f> 0b e8 9a 55 d7 ff 48 89 df 48 c7 c6 60 f0 94 8a e8 8b e1 11 00
RSP: 0018:ffffc90003567618 EFLAGS: 00010046
RAX: 561a9a67cd398b00 RBX: ffffea0001a6cec0 RCX: 561a9a67cd398b00
RDX: 0000000000000002 RSI: ffffffff8a8c15e0 RDI: ffffffff8adef320
RBP: ffffc90003567778 R08: dffffc0000000000 R09: fffffbfff1c3e976
R10: fffffbfff1c3e976 R11: 1ffffffff1c3e975 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807974a2f8 R15: ffff88807974a300
FS:  000055556cf05500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c0 CR3: 000000007df82000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __filemap_remove_folio+0xbb/0x860 mm/filemap.c:222
 filemap_remove_folio+0xed/0x2c0 mm/filemap.c:255
 truncate_inode_folio+0x59/0x70 mm/truncate.c:195
 shmem_undo_range+0x4d2/0x2050 mm/shmem.c:942
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171
 evict+0x485/0x870 fs/inode.c:705
 __dentry_kill+0x431/0x650 fs/dcache.c:611
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xfa/0x1d0 fs/dcache.c:918
 __fput+0x5e0/0x920 fs/file_table.c:328
 task_work_run+0x1ca/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6cc758eb69
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:00007ffe6042a7d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000016f92 RCX: 00007f6cc758eb69
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000086042aacf
R10: 00007f6cc7200000 R11: 0000000000000246 R12: 00007f6cc77b5fac
R13: 00007f6cc77b5fa0 R14: ffffffffffffffff R15: 0000000000000003
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_unaccount_folio+0x5cf/0xa80 mm/filemap.c:153
Code: 07 38 c1 0f 8c 19 fe ff ff 4c 89 e7 e8 0a 72 27 00 e9 0c fe ff ff e8 b0 55 d7 ff 48 89 df 48 c7 c6 00 eb 94 8a e8 a1 e1 11 00 <0f> 0b e8 9a 55 d7 ff 48 89 df 48 c7 c6 60 f0 94 8a e8 8b e1 11 00
RSP: 0018:ffffc90003567618 EFLAGS: 00010046
RAX: 561a9a67cd398b00 RBX: ffffea0001a6cec0 RCX: 561a9a67cd398b00
RDX: 0000000000000002 RSI: ffffffff8a8c15e0 RDI: ffffffff8adef320
RBP: ffffc90003567778 R08: dffffc0000000000 R09: fffffbfff1c3e976
R10: fffffbfff1c3e976 R11: 1ffffffff1c3e975 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807974a2f8 R15: ffff88807974a300
FS:  000055556cf05500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000001c0 CR3: 000000007df82000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400