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Date: Fri, 17 May 2024 22:23:21 -0700 From: syzbot <syzbot+caf3fed221ac23a1398f@...kaller.appspotmail.com> To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu Subject: [syzbot] [ext4?] WARNING: locking bug in ext4_mb_add_groupinfo Hello, syzbot found the following issue on: HEAD commit: a5131c3fdf26 Merge tag 'x86-shstk-2024-05-13' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152fcf98980000 kernel config: https://syzkaller.appspot.com/x/.config?x=fdb182f40cdd66f7 dashboard link: https://syzkaller.appspot.com/bug?extid=caf3fed221ac23a1398f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-a5131c3f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6d23116dab9c/vmlinux-a5131c3f.xz kernel image: https://storage.googleapis.com/syzbot-assets/dd8b9de9af4f/bzImage-a5131c3f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+caf3fed221ac23a1398f@...kaller.appspotmail.com Looking for class "c->lock" with key __key.0, but found a different class "&c->lock" with the same key WARNING: CPU: 3 PID: 5490 at kernel/locking/lockdep.c:932 look_up_lock_class+0x133/0x140 kernel/locking/lockdep.c:932 Modules linked in: CPU: 3 PID: 5490 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-01768-ga5131c3fdf26 #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 80 bc 0c 8b e8 9c a3 7d f6 90 0f 0b 90 90 90 31 db eb be c6 05 78 f3 b3 04 01 90 48 c7 c7 a0 bf 0c 8b e8 7e a3 7d 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:ffffc900076bf4d8 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffffffff93d7a900 RCX: ffffc90006f69000 RDX: 0000000000040000 RSI: ffffffff81514aa6 RDI: 0000000000000001 RBP: ffffffff9466e9d0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000006b6f6f4c R12: ffffe8ffad57d2c0 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff94656ba0 FS: 0000000000000000(0000) GS:ffff88802c500000(0063) knlGS:00000000f5e47b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f73d30c4 CR3: 00000000003a6000 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+0x73b/0x1810 mm/slub.c:3641 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3682 __slab_alloc_node mm/slub.c:3735 [inline] slab_alloc_node mm/slub.c:3908 [inline] kmem_cache_alloc+0x2f3/0x330 mm/slub.c:3925 kmem_cache_zalloc include/linux/slab.h:739 [inline] ext4_mb_add_groupinfo+0x43f/0x1180 fs/ext4/mballoc.c:3343 ext4_mb_init_backend fs/ext4/mballoc.c:3422 [inline] ext4_mb_init+0x1273/0x2530 fs/ext4/mballoc.c:3719 __ext4_fill_super fs/ext4/super.c:5518 [inline] ext4_fill_super+0x6e08/0xaea0 fs/ext4/super.c:5695 get_tree_bdev+0x36f/0x610 fs/super.c:1614 vfs_get_tree+0x8f/0x380 fs/super.c:1779 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+0x75/0x120 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: 0023:0xf7255579 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:00000000f5e47400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f5e47460 RCX: 00000000200005c0 RDX: 0000000020000100 RSI: 0000000001018e58 RDI: 00000000f5e474a0 RBP: 00000000f5e47460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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