loop0: detected capacity change from 0 to 40427
f2fs: Unknown parameter 'nouser_xattra
'
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 (5327)
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 4096 meta prealloc 0 meta pertrans 40960
BTRFS error (device loop0): failed to run delayed ref for logical 5378048 num_bytes 4096 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.0.0/5327
Modules linked in:
CPU: 0 UID: 0 PID: 5327 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 f3 67 dd fd eb 7a e8 ec 7a c2 fd 84 c0 74 20 e8 e3 67 dd fd eb 6a e8 dc 67 dd fd 48 8d 3d c5 8d 51 0c 44 89 fe <67> 48 0f b9 3a e9 0b ff ff ff e8 a3 6e c1 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc9000f7d7998 EFLAGS: 00010287
RAX: ffffffff83e84bd4 RBX: ffff888047a3bbe8 RCX: 0000000000100000
RDX: ffffc9000ef8a000 RSI: 00000000fffffffe RDI: ffffffff9039d9a0
RBP: 0000000000000000 R08: ffff888000cea500 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888042f8c001
R13: ffff888012211000 R14: dffffc0000000000 R15: 00000000fffffffe
FS:  00007f919111d6c0(0000) GS:ffff88808c888000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000036298000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x29a/0x30e0 fs/btrfs/transaction.c:2262
 sync_filesystem+0x1cf/0x230 fs/sync.c:66
 generic_shutdown_super+0x77/0x2d0 fs/super.c:625
 kill_anon_super+0x3b/0x70 fs/super.c:1292
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2127
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f919019cdd9
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:00007f919111cfe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f9190415fa0 RCX: 00007f919019cdd9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007f9190232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9190416038 R14: 00007f9190415fa0 R15: 00007ffc783fa048
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 e4                	test   %esp,%esp
   2:	75 07                	jne    0xb
   4:	e8 f3 67 dd fd       	call   0xfddd67fc
   9:	eb 7a                	jmp    0x85
   b:	e8 ec 7a c2 fd       	call   0xfdc27afc
  10:	84 c0                	test   %al,%al
  12:	74 20                	je     0x34
  14:	e8 e3 67 dd fd       	call   0xfddd67fc
  19:	eb 6a                	jmp    0x85
  1b:	e8 dc 67 dd fd       	call   0xfddd67fc
  20:	48 8d 3d c5 8d 51 0c 	lea    0xc518dc5(%rip),%rdi        # 0xc518dec
  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 a3 6e c1 07       	call   0x7c16edc
  39:	41 89 c4             	mov    %eax,%r12d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi