BTRFS info (device loop4): remap_block_rsv: size 0 reserved 0
BTRFS info (device loop4): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop4): delayed_refs_rsv: size 65536 reserved 0
BTRFS info (device loop4): 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 loop4): block group has cluster?: no
BTRFS info (device loop4): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop4): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4105 at do_chunk_alloc fs/btrfs/block-group.c:4105 [inline], CPU#0: kworker/u8:1/13
WARNING: fs/btrfs/block-group.c:4105 at btrfs_chunk_alloc+0x1029/0x15f0 fs/btrfs/block-group.c:4346, CPU#0: kworker/u8:1/13
Modules linked in:
CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4105 [inline]
RIP: 0010:btrfs_chunk_alloc+0x102b/0x15f0 fs/btrfs/block-group.c:4346
Code: db bd bb fd e9 6d 01 00 00 e8 51 c0 a0 fd 84 c0 74 22 e8 c8 bd bb fd e9 5a 01 00 00 e8 be bd bb fd 48 8d 3d 77 dd 6a 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 16 21 1a 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc900001276f0 EFLAGS: 00010293
RAX: ffffffff840896e2 RBX: ffffffffffffffe4 RCX: ffff88801ca9db80
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff8f737460
RBP: 0000000000000000 R08: ffff88801ca9db80 R09: 0000000000000003
R10: 0000000000000100 R11: 00000000fffffffb R12: 1ffff1100ca9be1e
R13: ffff888065f6db18 R14: ffff8880349c0001 R15: ffff8880654b9000
FS:  0000000000000000(0000) GS:ffff88812633c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff67247c000 CR3: 000000003751c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 flush_space+0x353/0xd80 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+0xb02/0x1830 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 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:	db bd bb fd e9 6d    	fstpt  0x6de9fdbb(%rbp)
   6:	01 00                	add    %eax,(%rax)
   8:	00 e8                	add    %ch,%al
   a:	51                   	push   %rcx
   b:	c0 a0 fd 84 c0 74 22 	shlb   $0x22,0x74c084fd(%rax)
  12:	e8 c8 bd bb fd       	call   0xfdbbbddf
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 be bd bb fd       	call   0xfdbbbddf
  21:	48 8d 3d 77 dd 6a 0b 	lea    0xb6add77(%rip),%rdi        # 0xb6add9f
  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 16 21 1a 07       	call   0x71a214f
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi