unmap_region+0x29c/0x300 mm/mmap.c:2343
 do_mas_align_munmap+0xcc2/0x12b0 mm/mmap.c:2592
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
 __vm_munmap+0x1ac/0x2d0 mm/mmap.c:2936
 __do_sys_munmap mm/mmap.c:2961 [inline]
 __se_sys_munmap mm/mmap.c:2958 [inline]
 __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2958
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
------------[ cut here ]------------
kernel BUG at mm/filemap.c:153!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6582 Comm: syz.3.844 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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 ca f9 27 00 e9 0c fe ff ff e8 b0 ed d6 ff 48 89 df 48 c7 c6 20 f7 94 8a e8 11 0d 12 00 <0f> 0b e8 9a ed d6 ff 48 89 df 48 c7 c6 80 fc 94 8a e8 fb 0c 12 00
RSP: 0018:ffffc90003b6f618 EFLAGS: 00010046
RAX: 8a4fa2ba40544000 RBX: ffffea00013b3d40 RCX: 8a4fa2ba40544000
RDX: 0000000000000002 RSI: ffffffff8a8c22a0 RDI: ffffffff8adf13a0
RBP: ffffc90003b6f778 R08: ffffffff8e1ff42f R09: 1ffffffff1c3fe85
R10: dffffc0000000000 R11: fffffbfff1c3fe86 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88805521bc38 R15: 1ffff9200076ded4
FS:  00005555680d3500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c360a74 CR3: 0000000023dee000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __filemap_remove_folio+0xbc/0x8a0 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+0x533/0x20c0 mm/shmem.c:942
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x25b/0xa80 mm/shmem.c:1171
 evict+0x4c9/0x8d0 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+0x1d0/0x260 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+0xee/0x180 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:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7ef2b9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd79e0a488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffd79e0a570 RCX: 00007f7ef2b9c819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000312b2 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2eb20000 R11: 0000000000000246 R12: 00007ffd79e0a5b0
R13: 00007f7ef2e15fac R14: 0000000000031315 R15: 00007f7ef2e15fa0
 </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 ca f9 27 00 e9 0c fe ff ff e8 b0 ed d6 ff 48 89 df 48 c7 c6 20 f7 94 8a e8 11 0d 12 00 <0f> 0b e8 9a ed d6 ff 48 89 df 48 c7 c6 80 fc 94 8a e8 fb 0c 12 00
RSP: 0018:ffffc90003b6f618 EFLAGS: 00010046
RAX: 8a4fa2ba40544000 RBX: ffffea00013b3d40 RCX: 8a4fa2ba40544000
RDX: 0000000000000002 RSI: ffffffff8a8c22a0 RDI: ffffffff8adf13a0
RBP: ffffc90003b6f778 R08: ffffffff8e1ff42f R09: 1ffffffff1c3fe85
R10: dffffc0000000000 R11: fffffbfff1c3fe86 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88805521bc38 R15: 1ffff9200076ded4
FS:  00005555680d3500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c360a74 CR3: 0000000023dee000 CR4: 00000000003506f0