syzbot

loop5: detected capacity change from 0 to 40427
loop5: detected capacity change from 0 to 512
EXT4-fs (loop5): encrypted files will use data=ordered instead of data journaling mode
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Looking for class "c->lock" with key init_kmem_cache_cpus.__key, but found a different class "&c->lock" with the same key
WARNING: CPU: 0 PID: 6639 at kernel/locking/lockdep.c:944 look_up_lock_class+0xe0/0x170 kernel/locking/lockdep.c:941
Modules linked in:
CPU: 0 UID: 0 PID: 6639 Comm: syz.5.75 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:look_up_lock_class+0xe0/0x170 kernel/locking/lockdep.c:941
Code: 01 0f 85 8a 00 00 00 c6 05 16 34 13 04 01 90 49 8b 16 49 8b 76 18 48 8b 8b b8 00 00 00 48 c7 c7 1d c5 2a 8e e8 61 b4 6f f5 90 <0f> 0b 90 90 eb 61 90 e8 d4 f4 dd f8 e8 5f 31 90 f5 48 c7 c7 c3 c4
RSP: 0018:ffffc90003caf528 EFLAGS: 00010046
RAX: 4185332b8c4e5900 RBX: ffffffff93e530e0 RCX: 0000000000080000
RDX: ffffc900047a1000 RSI: 000000000000b5ac RDI: 000000000000b5ad
RBP: ffff88802db89e00 R08: ffffffff81826ce2 R09: 1ffff110170c47d2
R10: dffffc0000000000 R11: ffffed10170c47d3 R12: ffffffff9a4d5780
R13: ffffffff933c6020 R14: ffffe8ffffc707a0 R15: ffffffff933c6020
FS:  00007f5ef75f66c0(0000) GS:ffff88812525a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5eef03f000 CR3: 000000002fe62000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 register_lock_class+0x54/0x330 kernel/locking/lockdep.c:1295
 __lock_acquire+0x80/0xd80 kernel/locking/lockdep.c:5110
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 local_lock_acquire+0x20/0x80 include/linux/local_lock_internal.h:29
 ___slab_alloc+0x11e1/0x1500 mm/slub.c:3898
 __slab_alloc+0x58/0xa0 mm/slub.c:3939
 __slab_alloc_node mm/slub.c:4014 [inline]
 slab_alloc_node mm/slub.c:4175 [inline]
 kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4194
 ext4_mb_add_groupinfo+0x603/0xe50 fs/ext4/mballoc.c:3356
 ext4_mb_init_backend fs/ext4/mballoc.c:3435 [inline]
 ext4_mb_init+0x17e8/0x2860 fs/ext4/mballoc.c:3733
 __ext4_fill_super fs/ext4/super.c:5551 [inline]
 ext4_fill_super+0x57f3/0x64b0 fs/ext4/super.c:5722
 get_tree_bdev_flags+0x490/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5ef978e90a
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:00007f5ef75f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5ef75f5ef0 RCX: 00007f5ef978e90a
RDX: 0000200000000040 RSI: 0000200000000dc0 RDI: 00007f5ef75f5eb0
RBP: 0000200000000040 R08: 00007f5ef75f5ef0 R09: 0000000000004016
R10: 0000000000004016 R11: 0000000000000246 R12: 0000200000000dc0
R13: 00007f5ef75f5eb0 R14: 000000000000043c R15: 0000200000000780
 </TASK>