loop0: detected capacity change from 0 to 32768
BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5321)
BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d
BTRFS info (device loop0): using sha256 checksum algorithm
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): enabling free space tree
BTRFS info (device loop0): setting incompat feature flag for SIMPLE_QUOTA (0x10000)
BTRFS warning (device loop0): to be deleted qgroup 0/5 has non-zero numbers, data 0 meta prealloc 0 meta pertrans 16384
BTRFS error (device loop0): failed to run delayed ref for logical 5382144 num_bytes 8192 type 178 action 1 ref_mod 1: -2
------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:2247 at btrfs_run_delayed_refs+0x30b/0x3b0 fs/btrfs/extent-tree.c:2247, CPU#0: syz.0.0/5321
Modules linked in:
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 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
RIP: 0010:btrfs_run_delayed_refs+0x30e/0x3b0 fs/btrfs/extent-tree.c:2247
Code: 85 e4 75 07 e8 63 1d e1 fd eb 7a e8 5c 39 c6 fd 84 c0 74 20 e8 53 1d e1 fd eb 6a e8 4c 1d e1 fd 48 8d 3d 85 01 58 0c 44 89 fe <67> 48 0f b9 3a e9 0b ff ff ff e8 13 24 d0 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc900014f7b58 EFLAGS: 00010283
RAX: ffffffff83e40674 RBX: ffff8880472b8000 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 00000000fffffffe RDI: ffffffff903c0800
RBP: 0000000000000000 R08: ffff888033c44a00 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888011c74001
R13: ffff8880416a0000 R14: dffffc0000000000 R15: 00000000fffffffe
FS:  00007fcb4fe126c0(0000) GS:ffff88808c832000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57de40c5a3 CR3: 0000000042449000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x29a/0x30e0 fs/btrfs/transaction.c:2262
 sync_filesystem+0x1cf/0x230 fs/sync.c:66
 __do_sys_syncfs fs/sync.c:159 [inline]
 __se_sys_syncfs+0x94/0x110 fs/sync.c:148
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb4ef9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb4fe11fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000132
RAX: ffffffffffffffda RBX: 00007fcb4f215fa0 RCX: 00007fcb4ef9c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fcb4f032c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb4f216038 R14: 00007fcb4f215fa0 R15: 00007ffea9a6fd78
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 e4                	test   %esp,%esp
   2:	75 07                	jne    0xb
   4:	e8 63 1d e1 fd       	call   0xfde11d6c
   9:	eb 7a                	jmp    0x85
   b:	e8 5c 39 c6 fd       	call   0xfdc6396c
  10:	84 c0                	test   %al,%al
  12:	74 20                	je     0x34
  14:	e8 53 1d e1 fd       	call   0xfde11d6c
  19:	eb 6a                	jmp    0x85
  1b:	e8 4c 1d e1 fd       	call   0xfde11d6c
  20:	48 8d 3d 85 01 58 0c 	lea    0xc580185(%rip),%rdi        # 0xc5801ac
  27:	44 89 fe             	mov    %r15d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 0b ff ff ff       	jmp    0xffffff3f
  34:	e8 13 24 d0 07       	call   0x7d0244c
  39:	41 89 c4             	mov    %eax,%r12d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi