------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:2939 at btrfs_create_pending_block_groups+0x13d8/0x15e0 fs/btrfs/block-group.c:2939, CPU#0: kworker/u4:8/1060
Modules linked in:
CPU: 0 UID: 0 PID: 1060 Comm: kworker/u4:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:btrfs_create_pending_block_groups+0x13d8/0x15e0 fs/btrfs/block-group.c:2939
Code: 83 fb f4 75 63 e8 48 0e 8e fd eb 65 e8 41 0e 8e fd eb 1a e8 3a 0e 8e fd 49 be 00 00 00 00 00 fc ff df eb 09 e8 29 0e 8e fd 90 <0f> 0b 90 f7 db e9 47 fd ff ff e8 19 0e 8e fd eb 10 e8 12 0e 8e fd
RSP: 0018:ffffc900015af540 EFLAGS: 00010293
RAX: ffffffff843904b7 RBX: 00000000ffffffe4 RCX: ffff888036aa0000
RDX: 0000000000000000 RSI: ffffffff8f1fc090 RDI: 00000000ffffffe4
RBP: ffffc900015af7c0 R08: ffff888036aa0000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff888050d0e190
R13: fffff520002b5ec4 R14: dffffc0000000000 R15: ffff888050d0e358
FS:  0000000000000000(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbba37212c0 CR3: 0000000043a9b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1092
 flush_space+0x3e9/0xde0 fs/btrfs/space-info.c:912
 do_async_reclaim_metadata_space+0x3e8/0x940 fs/btrfs/space-info.c:1211
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1278
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>