BTRFS error (device loop2): failed to run delayed ref for logical 5402624 num_bytes 61440 type 178 action 1 ref_mod 1: -2
------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:2247 at btrfs_run_delayed_refs+0x30b/0x3b0 fs/btrfs/extent-tree.c:2247, CPU#0: kworker/u8:4/59
Modules linked in:
CPU: 0 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:btrfs_run_delayed_refs+0x30e/0x3b0 fs/btrfs/extent-tree.c:2247
Code: 85 e4 75 07 e8 93 b3 e1 fd eb 7a e8 fc c0 c6 fd 84 c0 74 20 e8 83 b3 e1 fd eb 6a e8 7c b3 e1 fd 48 8d 3d 15 d6 36 0c 44 89 fe <67> 48 0f b9 3a e9 0b ff ff ff e8 93 bb cb 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc9000211f7b8 EFLAGS: 00010293
RAX: ffffffff83e40c54 RBX: ffff8880786965c8 RCX: ffff88801cb81e80
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: ffffffff901ae270
RBP: 0000000000000000 R08: ffff88801cb81e80 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff888031adc001
R13: ffff8880782bf000 R14: dffffc0000000000 R15: 00000000fffffffe
FS:  0000000000000000(0000) GS:ffff888125454000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005590ab78f950 CR3: 0000000032ef9000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 flush_space+0x28d/0xd80 fs/btrfs/space-info.c:-1
 do_async_reclaim_metadata_space+0x3fc/0x960 fs/btrfs/space-info.c:1187
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1254
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 e4                	test   %esp,%esp
   2:	75 07                	jne    0xb
   4:	e8 93 b3 e1 fd       	call   0xfde1b39c
   9:	eb 7a                	jmp    0x85
   b:	e8 fc c0 c6 fd       	call   0xfdc6c10c
  10:	84 c0                	test   %al,%al
  12:	74 20                	je     0x34
  14:	e8 83 b3 e1 fd       	call   0xfde1b39c
  19:	eb 6a                	jmp    0x85
  1b:	e8 7c b3 e1 fd       	call   0xfde1b39c
  20:	48 8d 3d 15 d6 36 0c 	lea    0xc36d615(%rip),%rdi        # 0xc36d63c
  27:	44 89 fe             	mov    %r15d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 0b ff ff ff       	jmp    0xffffff3f
  34:	e8 93 bb cb 07       	call   0x7cbbbcc
  39:	41 89 c4             	mov    %eax,%r12d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi