BTRFS info (device loop7): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4190208 bytes available) [readonly]
BTRFS info (device loop7): block group has cluster?: no
BTRFS info (device loop7): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop7): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4097 at do_chunk_alloc fs/btrfs/block-group.c:4097 [inline], CPU#1: kworker/u8:10/3493
WARNING: fs/btrfs/block-group.c:4097 at btrfs_chunk_alloc+0x1029/0x15f0 fs/btrfs/block-group.c:4338, CPU#1: kworker/u8:10/3493
Modules linked in:
CPU: 1 UID: 0 PID: 3493 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4097 [inline]
RIP: 0010:btrfs_chunk_alloc+0x102b/0x15f0 fs/btrfs/block-group.c:4338
Code: 4b a8 c2 fd e9 6d 01 00 00 e8 51 d7 a7 fd 84 c0 74 22 e8 38 a8 c2 fd e9 5a 01 00 00 e8 2e a8 c2 fd 48 8d 3d e7 e1 51 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 a6 ea 11 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc9000d80f6f0 EFLAGS: 00010293
RAX: ffffffff84006d52 RBX: ffffffffffffffe4 RCX: ffff8880324e1e00
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff8f524f40
RBP: 0000000000000000 R08: ffff8880324e1e00 R09: 0000000000000003
R10: 0000000000000100 R11: 00000000fffffffb R12: 1ffff1100bc91f1e
R13: ffff888062b16d08 R14: ffff888075fc0001 R15: ffff88803b6b0800
FS:  0000000000000000(0000) GS:ffff888126695000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe23ffc CR3: 000000005e5fc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 flush_space+0x353/0xd30 fs/btrfs/space-info.c:896
 do_async_reclaim_metadata_space+0x411/0x970 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:3275 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 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:	4b a8 c2             	rex.WXB test $0xc2,%al
   3:	fd                   	std
   4:	e9 6d 01 00 00       	jmp    0x176
   9:	e8 51 d7 a7 fd       	call   0xfda7d75f
   e:	84 c0                	test   %al,%al
  10:	74 22                	je     0x34
  12:	e8 38 a8 c2 fd       	call   0xfdc2a84f
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 2e a8 c2 fd       	call   0xfdc2a84f
  21:	48 8d 3d e7 e1 51 0b 	lea    0xb51e1e7(%rip),%rdi        # 0xb51e20f
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 b3 fc ff ff       	jmp    0xfffffce7
  34:	e8 a6 ea 11 07       	call   0x711eadf
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi