do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
 x64_sys_call+0x14fa/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
kernel BUG at mm/filemap.c:1498!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 12661 Comm: syz.3.1555 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:folio_unlock mm/filemap.c:1498 [inline]
RIP: 0010:folio_unlock+0xb3/0xd0 mm/filemap.c:1493
Code: e3 52 ca ff 48 89 ef 31 f6 e8 f9 ed ff ff 5b 5d e9 d2 52 ca ff e8 cd 52 ca ff 48 c7 c6 60 13 b9 8b 48 89 ef e8 5e 0d 12 00 90 <0f> 0b 48 89 df e8 e3 bc 2f 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc900160677a0 EFLAGS: 00010246
RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000ce5f000
RDX: 0000000000080000 RSI: ffffffff81f14b62 RDI: ffff8880310c0444
RBP: ffffea00015a6500 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90aba997 R11: 0000000000000001 R12: ffff88804dabaf30
R13: ffffc90016067b98 R14: ffffea00015a6500 R15: dffffc0000000000
FS:  00007fa410f316c0(0000) GS:ffff8881246b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3371bff8 CR3: 000000006ad67000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 netfs_perform_write+0xacd/0x1e60 fs/netfs/buffered_write.c:407
 netfs_buffered_write_iter_locked fs/netfs/buffered_write.c:452 [inline]
 netfs_file_write_iter+0x495/0x570 fs/netfs/buffered_write.c:491
 v9fs_file_write_iter+0x9b/0x100 fs/9p/vfs_file.c:407
 do_iter_readv_writev+0x662/0x9e0 fs/read_write.c:827
 vfs_writev+0x35f/0xde0 fs/read_write.c:1057
 do_pwritev+0x1a6/0x270 fs/read_write.c:1153
 __do_sys_pwritev2 fs/read_write.c:1211 [inline]
 __se_sys_pwritev2 fs/read_write.c:1202 [inline]
 __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1202
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa41018eba9
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:00007fa410f31038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fa4103d5fa0 RCX: 00007fa41018eba9
RDX: 0000000000000001 RSI: 0000200000000440 RDI: 0000000000000007
RBP: 00007fa410211e19 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4103d6038 R14: 00007fa4103d5fa0 R15: 00007ffdc6198e28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_unlock mm/filemap.c:1498 [inline]
RIP: 0010:folio_unlock+0xb3/0xd0 mm/filemap.c:1493
Code: e3 52 ca ff 48 89 ef 31 f6 e8 f9 ed ff ff 5b 5d e9 d2 52 ca ff e8 cd 52 ca ff 48 c7 c6 60 13 b9 8b 48 89 ef e8 5e 0d 12 00 90 <0f> 0b 48 89 df e8 e3 bc 2f 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc900160677a0 EFLAGS: 00010246
RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000ce5f000
RDX: 0000000000080000 RSI: ffffffff81f14b62 RDI: ffff8880310c0444
RBP: ffffea00015a6500 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90aba997 R11: 0000000000000001 R12: ffff88804dabaf30
R13: ffffc90016067b98 R14: ffffea00015a6500 R15: dffffc0000000000
FS:  00007fa410f316c0(0000) GS:ffff8881246b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc0a9e8f19 CR3: 000000006ad67000 CR4: 0000000000350ef0