BTRFS info (device loop8): trying to use backup root at mount time
btrfs: Deprecated parameter 'usebackuproot'
BTRFS warning: 'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead
BTRFS warning (device loop8 state M): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/transaction.c:2037 at cleanup_transaction+0x79e/0x960 fs/btrfs/transaction.c:2037, CPU#0: syz.8.3088/22746
Modules linked in:
CPU: 0 UID: 0 PID: 22746 Comm: syz.8.3088 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:cleanup_transaction+0x7a1/0x960 fs/btrfs/transaction.c:2037
Code: 0d ef fd e9 80 00 00 00 e8 cc 21 d5 fd 84 c0 74 28 e8 c3 0d ef fd eb 70 41 89 c7 e8 b9 0d ef fd 48 8d 3d 22 ae d9 0b 44 89 fe <67> 48 0f b9 3a 4c 8b 6c 24 10 e9 de 00 00 00 e8 5b 9b 8c 07 89 c3
RSP: 0018:ffffc9000527f680 EFLAGS: 00010283
RAX: ffffffff83d20be7 RBX: ffff88807b54c000 RCX: 0000000000080000
RDX: ffffc90016400000 RSI: 00000000ffffffe4 RDI: ffffffff8fabba10
RBP: ffffc9000527f7b0 R08: ffff88805822bc80 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: dffffc0000000000
R13: ffff88806a315bf0 R14: 0000000000000000 R15: 00000000ffffffe4
FS:  00007f0f82ddd6c0(0000) GS:ffff888125bf9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8665e8bf98 CR3: 00000000752da000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x2512/0x2f80 fs/btrfs/transaction.c:2629
 btrfs_set_free_space_cache_v1_active+0x71/0x430 fs/btrfs/free-space-cache.c:4156
 btrfs_remount_cleanup fs/btrfs/super.c:1295 [inline]
 btrfs_reconfigure+0x1bed/0x2180 fs/btrfs/super.c:1574
 reconfigure_super+0x227/0x880 fs/super.c:1077
 do_remount fs/namespace.c:3391 [inline]
 path_mount+0xd29/0xff0 fs/namespace.c:4141
 do_mount fs/namespace.c:4162 [inline]
 __do_sys_mount fs/namespace.c:4351 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4328
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0f81f90eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0f82ddce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0f82ddcef0 RCX: 00007f0f81f90eea
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 0000200000000180 R08: 00007f0f82ddcef0 R09: 00000000022520a2
R10: 00000000022520a2 R11: 0000000000000246 R12: 0000200000000100
R13: 00007f0f82ddceb0 R14: 0000000000000000 R15: 00002000000002c0
 </TASK>
----------------
Code disassembly (best guess):
   0:	0d ef fd e9 80       	or     $0x80e9fdef,%eax
   5:	00 00                	add    %al,(%rax)
   7:	00 e8                	add    %ch,%al
   9:	cc                   	int3
   a:	21 d5                	and    %edx,%ebp
   c:	fd                   	std
   d:	84 c0                	test   %al,%al
   f:	74 28                	je     0x39
  11:	e8 c3 0d ef fd       	call   0xfdef0dd9
  16:	eb 70                	jmp    0x88
  18:	41 89 c7             	mov    %eax,%r15d
  1b:	e8 b9 0d ef fd       	call   0xfdef0dd9
  20:	48 8d 3d 22 ae d9 0b 	lea    0xbd9ae22(%rip),%rdi        # 0xbd9ae49
  27:	44 89 fe             	mov    %r15d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 8b 6c 24 10       	mov    0x10(%rsp),%r13
  34:	e9 de 00 00 00       	jmp    0x117
  39:	e8 5b 9b 8c 07       	call   0x78c9b99
  3e:	89 c3                	mov    %eax,%ebx