------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:4212 at do_chunk_alloc fs/btrfs/block-group.c:4212 [inline], CPU#0: kworker/u4:4/70
WARNING: fs/btrfs/block-group.c:4212 at btrfs_chunk_alloc+0x10cc/0x1330 fs/btrfs/block-group.c:4453, CPU#0: kworker/u4:4/70
Modules linked in:
CPU: 0 UID: 0 PID: 70 Comm: kworker/u4:4 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_data_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4212 [inline]
RIP: 0010:btrfs_chunk_alloc+0x10cc/0x1330 fs/btrfs/block-group.c:4453
Code: 07 38 c1 0f 8c e9 ef ff ff 48 89 df e8 1d 04 f7 fd e9 dc ef ff ff e8 23 5d 85 fd eb 10 e8 1c 5d 85 fd eb 09 e8 15 5d 85 fd 90 <0f> 0b 90 44 89 f1 f7 d9 e9 38 fd ff ff 48 8b 4c 24 08 48 83 c1 5b
RSP: 0018:ffffc90000ae77b8 EFLAGS: 00010293
RAX: ffffffff84428ffb RBX: 1ffff1100264bd16 RCX: ffff888030f68000
RDX: 0000000000000000 RSI: ffffffff8f412880 RDI: 00000000ffffffe4
RBP: ffff888051468001 R08: ffff888030f68000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff1100264bd16
R13: 00000000ffffffe4 R14: ffffffffffffffe4 R15: ffff8880515ba140
FS:  0000000000000000(0000) GS:ffff88808c2c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055969171c790 CR3: 000000004f3ab000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x3df/0xde0 fs/btrfs/space-info.c:908
 do_async_reclaim_data_space+0x137/0x550 fs/btrfs/space-info.c:1455
 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1519
 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>