------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:2944 at btrfs_create_pending_block_groups+0x13d8/0x15e0 fs/btrfs/block-group.c:2944, CPU#0: kworker/u4:0/12
Modules linked in:
CPU: 0 UID: 0 PID: 12 Comm: kworker/u4:0 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:2944
Code: 83 fb f4 75 63 e8 48 6e 86 fd eb 65 e8 41 6e 86 fd eb 1a e8 3a 6e 86 fd 49 be 00 00 00 00 00 fc ff df eb 09 e8 29 6e 86 fd 90 <0f> 0b 90 f7 db e9 47 fd ff ff e8 19 6e 86 fd eb 10 e8 12 6e 86 fd
RSP: 0018:ffffc9000025f520 EFLAGS: 00010293
RAX: ffffffff84415e07 RBX: 00000000ffffffe4 RCX: ffff88801b704b00
RDX: 0000000000000000 RSI: ffffffff8f40fc70 RDI: 00000000ffffffe4
RBP: ffffc9000025f7a0 R08: ffff88801b704b00 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff88805269a150
R13: fffff5200004bec0 R14: dffffc0000000000 R15: ffff88805269a318
FS:  0000000000000000(0000) GS:ffff88808c2cd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3d1ffce9c CR3: 0000000013838000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1090
 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:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 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>