btrfs: Deprecated parameter 'usebackuproot'
BTRFS warning: 'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead
BTRFS warning (device loop7 state M): Skipping commit of aborted transaction.
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/transaction.c:2037 at cleanup_transaction fs/btrfs/transaction.c:2037 [inline], CPU#1: syz.7.16476/27535
WARNING: fs/btrfs/transaction.c:2037 at btrfs_commit_transaction+0xd07/0x4240 fs/btrfs/transaction.c:2630, CPU#1: syz.7.16476/27535
Modules linked in:
CPU: 1 UID: 0 PID: 27535 Comm: syz.7.16476 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:2037 [inline]
RIP: 0010:btrfs_commit_transaction+0xd0b/0x4240 fs/btrfs/transaction.c:2630
Code: da fd 41 8d 47 1e 83 f8 19 77 0f ba 01 00 04 02 48 0f a3 c2 0f 82 68 1a 00 00 e8 30 76 da fd 48 8d 3d 59 b0 ac 0c 8b 74 24 28 <67> 48 0f b9 3a c7 44 24 54 01 00 00 00 e8 13 76 da fd 44 8b 44 24
RSP: 0018:ffffc9000bfb79d8 EFLAGS: 00010283
RAX: 000000000001112f RBX: ffff888028d90000 RCX: ffffc90023604000
RDX: 0000000000080000 RSI: 00000000ffffffe4 RDI: ffffffff90912620
RBP: ffff88807bd80000 R08: 0000000000000005 R09: fffffffffffffffb
R10: ffffffffffffffe4 R11: 1ffff11010348c02 R12: ffff88807bd81b00
R13: ffff888068e3c910 R14: ffff88807bd825a8 R15: ffffffffffffffe4
FS:  00007f2b65c8a6c0(0000) GS:ffff8881249f2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566baf808 CR3: 0000000029a66000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_set_free_space_cache_v1_active+0x28a/0x5b0 fs/btrfs/free-space-cache.c:4156
 btrfs_remount_cleanup fs/btrfs/super.c:1295 [inline]
 btrfs_reconfigure+0xeb0/0x21e0 fs/btrfs/super.c:1574
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3264 [inline]
 path_mount+0x1a4c/0x23a0 fs/namespace.c:4014
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount fs/namespace.c:4201 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b64d90eea
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:00007f2b65c89e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2b65c89ef0 RCX: 00007f2b64d90eea
RDX: 0000200000000180 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 0000200000000180 R08: 00007f2b65c89ef0 R09: 00000000022520a2
R10: 00000000022520a2 R11: 0000000000000246 R12: 0000200000000100
R13: 00007f2b65c89eb0 R14: 0000000000000000 R15: 00002000000002c0
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	fd                   	std
   1:	41 8d 47 1e          	lea    0x1e(%r15),%eax
   5:	83 f8 19             	cmp    $0x19,%eax
   8:	77 0f                	ja     0x19
   a:	ba 01 00 04 02       	mov    $0x2040001,%edx
   f:	48 0f a3 c2          	bt     %rax,%rdx
  13:	0f 82 68 1a 00 00    	jb     0x1a81
  19:	e8 30 76 da fd       	call   0xfdda764e
  1e:	48 8d 3d 59 b0 ac 0c 	lea    0xcacb059(%rip),%rdi        # 0xcacb07e
  25:	8b 74 24 28          	mov    0x28(%rsp),%esi
* 29:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2e:	c7 44 24 54 01 00 00 	movl   $0x1,0x54(%rsp)
  35:	00
  36:	e8 13 76 da fd       	call   0xfdda764e
  3b:	44                   	rex.R
  3c:	8b                   	.byte 0x8b
  3d:	44                   	rex.R
  3e:	24                   	.byte 0x24