__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+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 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: 6509 Comm: syz.0.17 Not tainted 6.15.0-rc6-syzkaller-g9f35e33144ae #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:folio_unlock mm/filemap.c:1498 [inline]
RIP: 0010:folio_unlock+0xb3/0xd0 mm/filemap.c:1493
Code: 03 19 c9 ff 48 89 ef 31 f6 e8 d9 ef ff ff 5b 5d e9 f2 18 c9 ff e8 ed 18 c9 ff 48 c7 c6 a0 e8 98 8b 48 89 ef e8 ae e1 11 00 90 <0f> 0b 48 89 df e8 23 96 2e 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc9000384f980 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888024f32440 RSI: ffffffff81f22d62 RDI: ffff888024f32884
RBP: ffffea000128e440 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9084ff17 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffc9000384fde8 R14: ffffea000128e440 R15: ffff888040419570
FS:  00007f2ae8d5b6c0(0000) GS:ffff8880d69df000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005649a5c19f80 CR3: 0000000024611000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netfs_perform_write+0xba5/0x20f0 fs/netfs/buffered_write.c:400
 netfs_buffered_write_iter_locked fs/netfs/buffered_write.c:445 [inline]
 netfs_file_write_iter+0x495/0x570 fs/netfs/buffered_write.c:484
 v9fs_file_write_iter+0x9b/0x100 fs/9p/vfs_file.c:407
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x5ba/0x1180 fs/read_write.c:684
 ksys_write+0x12a/0x240 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ae7f8cde9
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:00007f2ae8d5b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2ae81a5fa0 RCX: 00007f2ae7f8cde9
RDX: 000000000000000a RSI: 0000400000000080 RDI: 0000000000000004
RBP: 00007f2ae8d5b090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f2ae81a5fa0 R15: 00007fff96ec28b8
 </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: 03 19 c9 ff 48 89 ef 31 f6 e8 d9 ef ff ff 5b 5d e9 f2 18 c9 ff e8 ed 18 c9 ff 48 c7 c6 a0 e8 98 8b 48 89 ef e8 ae e1 11 00 90 <0f> 0b 48 89 df e8 23 96 2e 00 e9 7b ff ff ff 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc9000384f980 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888024f32440 RSI: ffffffff81f22d62 RDI: ffff888024f32884
RBP: ffffea000128e440 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9084ff17 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffc9000384fde8 R14: ffffea000128e440 R15: ffff888040419570
FS:  00007f2ae8d5b6c0(0000) GS:ffff8880d6cdf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00004000000001c0 CR3: 0000000024611000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400