BTRFS error (device loop0): allocation failed flags 12, wanted 4096 tree-log 0, relocation: 0
BTRFS info (device loop0): space_info DATA+METADATA (sub-group id 0) has 16384 free, is full
BTRFS info (device loop0): space_info total=11534336, used=9703424, pinned=0, reserved=212992, may_use=1601536, readonly=0 zone_unusable=0
BTRFS info (device loop0): global_block_rsv: size 983040 reserved 978944
BTRFS info (device loop0): trans_block_rsv: size 0 reserved 0
BTRFS info (device loop0): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop0): remap_block_rsv: size 0 reserved 0
BTRFS info (device loop0): delayed_block_rsv: size 65536 reserved 65536
BTRFS info (device loop0): delayed_refs_rsv: size 950272 reserved 552960
BTRFS info (device loop0): block group 5242880 has 1638400 bytes, 1601536 used 0 pinned 16384 reserved 0 delalloc 0 super 0 zone_unusable (20480 bytes available) 
BTRFS critical (device loop0): entry offset 5316608, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 5337088, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 5357568, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 5373952, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 6172672, bytes 4096, bitmap no
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 5 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): block group 6881280 has 1638400 bytes, 1638400 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (0 bytes available) 
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): block group 8519680 has 8257536 bytes, 6463488 used 0 pinned 196608 reserved 0 delalloc 0 super 0 zone_unusable (1597440 bytes available) 
BTRFS critical (device loop0): entry offset 13959168, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 14028800, bytes 8192, bitmap no
BTRFS critical (device loop0): entry offset 14307328, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 14442496, bytes 8192, bitmap no
BTRFS critical (device loop0): entry offset 14647296, bytes 4096, bitmap no
BTRFS critical (device loop0): entry offset 15208448, bytes 1568768, bitmap no
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 6 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): 1617920 bytes available across all block groups
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/extent-tree.c:3429 at __btrfs_free_extent+0x1fd1/0x39c0 fs/btrfs/extent-tree.c:3429, CPU#0: kworker/u4:4/61
Modules linked in:
CPU: 0 UID: 0 PID: 61 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:__btrfs_free_extent+0x1fd1/0x39c0 fs/btrfs/extent-tree.c:3429
Code: b8 d3 fd 45 85 f6 0f 85 e0 05 00 00 e8 98 b4 d3 fd e9 47 09 00 00 e8 8e b4 d3 fd eb 10 e8 87 b4 d3 fd eb 09 e8 80 b4 d3 fd 90 <0f> 0b 90 4c 8b 7c 24 10 44 89 e1 f7 d9 e9 93 e7 ff ff e8 e8 0c c4
RSP: 0018:ffffc90000adf0e0 EFLAGS: 00010293
RAX: ffffffff83f2bd90 RBX: ffff88804fb74001 RCX: ffff888000268000
RDX: 0000000000000000 RSI: ffffffff8ef7b4a0 RDI: 00000000ffffffe4
RBP: ffffc90000adf290 R08: ffff888000268000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 00000000ffffffe4
R13: ffff8880528aaa48 R14: dffffc0000000000 R15: 00000000ffffffe4
FS:  0000000000000000(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007effc297d990 CR3: 0000000043595000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1824 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1851 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline]
 __btrfs_run_delayed_refs+0x166c/0x43b0 fs/btrfs/extent-tree.c:2134
 btrfs_run_delayed_refs+0xdc/0x2a0 fs/btrfs/extent-tree.c:2246
 btrfs_commit_transaction+0x28a/0x30b0 fs/btrfs/transaction.c:2262
 flush_space+0x28a/0xde0 fs/btrfs/space-info.c:-1
 do_async_reclaim_data_space+0x29e/0x550 fs/btrfs/space-info.c:1471
 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1519
 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>