loop3: detected capacity change from 0 to 512 ------------[ cut here ]------------ Looking for class "c->lock" with key __key.0, but found a different class "&c->lock" with the same key WARNING: CPU: 1 PID: 7459 at kernel/locking/lockdep.c:932 look_up_lock_class+0x133/0x140 kernel/locking/lockdep.c:932 Modules linked in: CPU: 1 PID: 7459 Comm: syz-executor.3 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:look_up_lock_class+0x133/0x140 kernel/locking/lockdep.c:932 Code: c7 c7 a0 b7 2c 8b e8 ec a3 74 f6 90 0f 0b 90 90 90 31 db eb be c6 05 74 d6 ef 04 01 90 48 c7 c7 c0 ba 2c 8b e8 ce a3 74 f6 90 <0f> 0b 90 90 e9 62 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003aaf4d8 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffffffff941f9940 RCX: ffffc90002ca7000 RDX: 0000000000040000 RSI: ffffffff81510236 RDI: 0000000000000001 RBP: ffffffff94aedd50 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000006b6f6f4c R12: ffffe8ffad16c840 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff94ad5be0 FS: 0000000000000000(0000) GS:ffff88802c100000(0063) knlGS:00000000f5f19b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000c001368000 CR3: 000000002102a000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> register_lock_class+0xb1/0x1230 kernel/locking/lockdep.c:1284 __lock_acquire+0x111/0x3b30 kernel/locking/lockdep.c:5014 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ___slab_alloc+0x7bb/0x1870 mm/slub.c:3715 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3756 __slab_alloc_node mm/slub.c:3809 [inline] slab_alloc_node mm/slub.c:3988 [inline] kmem_cache_alloc_noprof+0x2ae/0x2f0 mm/slub.c:4007 ext4_mb_add_groupinfo+0x445/0x1180 fs/ext4/mballoc.c:3355 ext4_mb_init_backend fs/ext4/mballoc.c:3434 [inline] ext4_mb_init+0x127a/0x2530 fs/ext4/mballoc.c:3732 __ext4_fill_super fs/ext4/super.c:5501 [inline] ext4_fill_super+0x6d55/0xacf0 fs/ext4/super.c:5676 get_tree_bdev+0x36f/0x610 fs/super.c:1615 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7327579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5f19400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5f19460 RCX: 0000000020000000 RDX: 0000000020000180 RSI: 000000000021081e RDI: 00000000f5f194a0 RBP: 00000000f5f19460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi