BTRFS error (device loop4): unrecognized mount option '@'
BTRFS warning (device loop4): Skipping commit of aborted transaction.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14186 at fs/btrfs/transaction.c:2018 cleanup_transaction fs/btrfs/transaction.c:2018 [inline]
WARNING: CPU: 1 PID: 14186 at fs/btrfs/transaction.c:2018 btrfs_commit_transaction+0x287d/0x3800 fs/btrfs/transaction.c:2526
Modules linked in:
CPU: 1 PID: 14186 Comm: syz.4.1837 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:cleanup_transaction fs/btrfs/transaction.c:2018 [inline]
RIP: 0010:btrfs_commit_transaction+0x287d/0x3800 fs/btrfs/transaction.c:2526
Code: e8 38 02 16 fe 48 8b 5c 24 20 0f 1f 44 00 00 e8 29 02 16 fe eb 16 e8 22 02 16 fe 48 c7 c7 20 26 eb 8a 44 89 f6 e8 b3 9b e1 fd <0f> 0b 48 89 df 48 c7 c6 20 28 eb 8a ba e2 07 00 00 44 89 f1 e8 9a
RSP: 0018:ffffc900035577e0 EFLAGS: 00010246
RAX: ed75c264b44ccf00 RBX: ffff8880612cd0b0 RCX: 0000000000080000
RDX: ffffc9000e42b000 RSI: 0000000000012929 RDI: 000000000001292a
RBP: ffffc90003557ae8 R08: ffffffff8166aa8c R09: ffffed10171e4f24
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880284ecdf8
R13: dffffc0000000000 R14: 00000000ffffffe4 R15: ffff8880612cd108
FS:  00007f912e0806c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06d71298e5 CR3: 000000006247f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_set_free_space_cache_v1_active+0x6d/0x220 fs/btrfs/free-space-cache.c:4001
 btrfs_remount_cleanup fs/btrfs/super.c:1914 [inline]
 btrfs_remount+0x750/0x1640 fs/btrfs/super.c:2117
 reconfigure_super+0x43a/0x870 fs/super.c:938
 do_remount fs/namespace.c:2668 [inline]
 path_mount+0xceb/0x10a0 fs/namespace.c:3334
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f913021890a
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:00007f912e07fe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f912e07fef0 RCX: 00007f913021890a
RDX: 0000400000000180 RSI: 0000400000000100 RDI: 0000000000000000
RBP: 0000400000000180 R08: 00007f912e07fef0 R09: 0000000000ad0c24
R10: 0000000000ad0c24 R11: 0000000000000246 R12: 0000400000000100
R13: 00007f912e07feb0 R14: 0000000000000000 R15: 00004000000002c0
 </TASK>