BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop5 (7:5) scanned by syz.5.2308 (26611)
BTRFS info (device loop5): first mount of filesystem a6a605fc-d5f1-4e66-8595-3726e2b761d6
BTRFS info (device loop5): using blake2b (blake2b-256-generic) checksum algorithm
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 26611 Comm: syz.5.2308 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 register_lock_class+0x2e8/0x320 kernel/locking/lockdep.c:1332
 __lock_acquire+0x99/0xd20 kernel/locking/lockdep.c:5112
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 touch_wq_lockdep_map+0xcb/0x180 kernel/workqueue.c:3907
 __flush_workqueue+0x121/0x14b0 kernel/workqueue.c:3949
 drain_workqueue+0xd3/0x390 kernel/workqueue.c:4113
 destroy_workqueue+0xbb/0xc70 kernel/workqueue.c:5869
 btrfs_destroy_workqueue+0x45/0x240 fs/btrfs/async-thread.c:358
 btrfs_stop_all_workers+0x1f2/0x2a0 fs/btrfs/disk-io.c:1782
 open_ctree+0x1217/0x3a10 fs/btrfs/disk-io.c:3676
 btrfs_fill_super fs/btrfs/super.c:991 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1954 [inline]
 btrfs_get_tree_subvol fs/btrfs/super.c:2091 [inline]
 btrfs_get_tree+0xf55/0x1820 fs/btrfs/super.c:2125
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
 do_mount fs/namespace.c:4136 [inline]
 __do_sys_mount fs/namespace.c:4347 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4324
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9024a7066a
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:00007f9022ccde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9022ccdef0 RCX: 00007f9024a7066a
RDX: 00002000000055c0 RSI: 0000200000000180 RDI: 00007f9022ccdeb0
RBP: 00002000000055c0 R08: 00007f9022ccdef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000180
R13: 00007f9022ccdeb0 R14: 000000000000559d R15: 0000200000000440
 </TASK>
BTRFS error (device loop5): open_ctree failed: -4