BTRFS info (device loop0): enabling free space tree
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BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/extent-tree.c:3425 at __btrfs_free_extent.isra.0+0xc79/0x2bb0 fs/btrfs/extent-tree.c:3425, CPU#3: syz-executor.0/5961
Modules linked in:
CPU: 3 UID: 0 PID: 5961 Comm: syz-executor.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_free_extent.isra.0+0xc7d/0x2bb0 fs/btrfs/extent-tree.c:3425
Code: 00 00 48 c7 c7 a0 b5 04 8c c6 05 37 87 8d 0c 01 e8 f8 2b b2 fd e9 55 95 fc fc e8 6e a4 d6 fd 48 8d 3d b7 0e ae 0c 8b 74 24 38 <67> 48 0f b9 3a bb 01 00 00 00 e9 3e 92 fc fc e8 4f a4 d6 fd 48 8b
RSP: 0018:ffffc90004347140 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffffffffffffe4 RCX: ffffffff8431e79e
RDX: ffff88802b880000 RSI: 00000000ffffffe4 RDI: ffffffff90dffab0
RBP: 0000000000624000 R08: 0000000000000005 R09: fffffffffffffffb
R10: ffffffffffffffe4 R11: 0000000000000000 R12: ffff88803641e160
R13: ffff8880361a8bf0 R14: ffff888034a04000 R15: 00000000ffffffe4
FS:  00007f6cc0aad6c0(0000) GS:ffff8880d6683000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c9fb20c660 CR3: 000000002a26b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_delayed_data_ref fs/btrfs/extent-tree.c:1665 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1855 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline]
 __btrfs_run_delayed_refs+0x910/0x3cd0 fs/btrfs/extent-tree.c:2133
 btrfs_run_delayed_refs+0x1a0/0x3c0 fs/btrfs/extent-tree.c:2245
 btrfs_commit_transaction+0x1f54/0x3800 fs/btrfs/transaction.c:2261
 btrfs_sync_file+0xa4e/0xfc0 fs/btrfs/file.c:1822
 vfs_fsync_range+0x9b/0x190 fs/sync.c:186
 generic_write_sync include/linux/fs.h:2654 [inline]
 btrfs_do_write_iter+0x6ce/0x920 fs/btrfs/file.c:1473
 iter_file_splice_write+0x830/0x10a0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x192/0x6c0 fs/splice.c:1159
 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x174/0x240 fs/splice.c:1228
 do_sendfile+0xadc/0xe20 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64 fs/read_write.c:1419 [inline]
 __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1419
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cbfc6e3b9
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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6cc0aad078 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f6cbfdabf80 RCX: 00007f6cbfc6e3b9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f6cbfccf498 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000880000c R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6cbfdabf80 R15: 00007ffe93b2ca08
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	48 c7 c7 a0 b5 04 8c 	mov    $0xffffffff8c04b5a0,%rdi
   9:	c6 05 37 87 8d 0c 01 	movb   $0x1,0xc8d8737(%rip)        # 0xc8d8747
  10:	e8 f8 2b b2 fd       	call   0xfdb22c0d
  15:	e9 55 95 fc fc       	jmp    0xfcfc956f
  1a:	e8 6e a4 d6 fd       	call   0xfdd6a48d
  1f:	48 8d 3d b7 0e ae 0c 	lea    0xcae0eb7(%rip),%rdi        # 0xcae0edd
  26:	8b 74 24 38          	mov    0x38(%rsp),%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	bb 01 00 00 00       	mov    $0x1,%ebx
  34:	e9 3e 92 fc fc       	jmp    0xfcfc9277
  39:	e8 4f a4 d6 fd       	call   0xfdd6a48d
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b