------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/extent-tree.c:2192 at btrfs_run_delayed_refs+0x30b/0x3b0 fs/btrfs/extent-tree.c:2192, CPU#0: syz.1.18/6085
Modules linked in:
CPU: 0 UID: 0 PID: 6085 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:btrfs_run_delayed_refs+0x30e/0x3b0 fs/btrfs/extent-tree.c:2192
Code: 85 e4 75 07 e8 f3 04 e2 fd eb 7a e8 4c 18 c7 fd 84 c0 74 20 e8 e3 04 e2 fd eb 6a e8 dc 04 e2 fd 48 8d 3d 55 07 37 0c 44 89 fe <67> 48 0f b9 3a e9 0b ff ff ff e8 e3 ab ca 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc9000590f1d8 EFLAGS: 00010293
RAX: ffffffff83e39c04 RBX: ffff88811596b250 RCX: ffff88816a5c0000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff901aa360
RBP: 0000000000000000 R08: ffff88816a5c0000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff8881b9100001
R13: ffff8881077eb000 R14: dffffc0000000000 R15: 00000000ffffffe4
FS:  00007fb0100a36c0(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdd2be3fc8 CR3: 00000001beeea000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x29a/0x31a0 fs/btrfs/transaction.c:2254
 btrfs_sync_file+0xdee/0x1260 fs/btrfs/file.c:1817
 generic_write_sync include/linux/fs.h:2640 [inline]
 btrfs_do_write_iter+0x72e/0x880 fs/btrfs/file.c:1468
 iter_file_splice_write+0x9a1/0x10f0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1159
 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x195/0x290 fs/splice.c:1228
 do_sendfile+0x535/0x7d0 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb00f19c799
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:00007fb0100a3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fb00f415fa0 RCX: 00007fb00f19c799
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fb00f232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb00f416038 R14: 00007fb00f415fa0 R15: 00007ffe0bf961f8
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 e4                	test   %esp,%esp
   2:	75 07                	jne    0xb
   4:	e8 f3 04 e2 fd       	call   0xfde204fc
   9:	eb 7a                	jmp    0x85
   b:	e8 4c 18 c7 fd       	call   0xfdc7185c
  10:	84 c0                	test   %al,%al
  12:	74 20                	je     0x34
  14:	e8 e3 04 e2 fd       	call   0xfde204fc
  19:	eb 6a                	jmp    0x85
  1b:	e8 dc 04 e2 fd       	call   0xfde204fc
  20:	48 8d 3d 55 07 37 0c 	lea    0xc370755(%rip),%rdi        # 0xc37077c
  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 e3 ab ca 07       	call   0x7caac1c
  39:	41 89 c4             	mov    %eax,%r12d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi
