loop5: detected capacity change from 0 to 2048 ------------[ cut here ]------------ Looking for class "ck" with key __key.0, but found a different class "&c->lock" with the same key WARNING: CPU: 1 PID: 6760 at kernel/locking/lockdep.c:938 look_up_lock_class+0x140/0x150 kernel/locking/lockdep.c:938 Modules linked in: CPU: 1 UID: 0 PID: 6760 Comm: syz.5.291 Not tainted 6.14.0-rc6-syzkaller-00145-g695caca9345a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:look_up_lock_class+0x140/0x150 kernel/locking/lockdep.c:938 Code: c7 c7 a0 fb 6c 8b e8 3f cc 24 f6 90 0f 0b 90 90 90 31 db eb be c6 05 9f af f5 04 01 90 48 c7 c7 80 fe 6c 8b e8 21 cc 24 f6 90 <0f> 0b 90 90 e9 58 ff ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffffc90004737440 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffffffff96ec2340 RCX: ffffc9000cd34000 RDX: 0000000000080000 RSI: ffffffff817a2276 RDI: 0000000000000001 RBP: ffffffff9a8d5410 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 5f2079656b20684c R12: ffffe8ffffd73580 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff9a8ba8a0 FS: 00007f969ad356c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f63fbfee000 CR3: 000000007e4b2000 CR4: 0000000000350ef0 Call Trace: register_lock_class+0xb1/0x1240 kernel/locking/lockdep.c:1292 __lock_acquire+0x135/0x3c40 kernel/locking/lockdep.c:5103 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ___slab_alloc+0xd7e/0x1720 mm/slub.c:3875 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_noprof+0xfa/0x3d0 mm/slub.c:4171 ext4_mb_add_groupinfo+0x445/0x1100 fs/ext4/mballoc.c:3356 ext4_mb_init_backend fs/ext4/mballoc.c:3435 [inline] ext4_mb_init+0x11df/0x2640 fs/ext4/mballoc.c:3733 __ext4_fill_super fs/ext4/super.c:5551 [inline] ext4_fill_super+0x8b72/0xb160 fs/ext4/super.c:5722 get_tree_bdev_flags+0x38e/0x620 fs/super.c:1636 vfs_get_tree+0x8e/0x340 fs/super.c:1814 do_new_mount fs/namespace.c:3560 [inline] path_mount+0x14e6/0x1f10 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount fs/namespace.c:4088 [inline] __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9699f8e90a 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:00007f969ad34e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f969ad34ef0 RCX: 00007f9699f8e90a RDX: 0000400000000000 RSI: 0000400000000bc0 RDI: 00007f969ad34eb0 RBP: 0000400000000000 R08: 00007f969ad34ef0 R09: 0000000003014001 R10: 0000000003014001 R11: 0000000000000246 R12: 0000400000000bc0 R13: 00007f969ad34eb0 R14: 00000000000007c1 R15: 0000400000000340