OCFS2: ERROR (device loop0): int ocfs2_validate_dx_root(struct super_block *, struct buffer_head *): Dir Index Root # 0 has bad signature On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: File system is now read-only. (syz.0.0,5325,0):ocfs2_find_entry_dx:1029 ERROR: status = -30 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted 6.13.0-rc7-syzkaller-00209-g9528d418de4d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ocfs2_dx_dir_lookup_rec+0x325/0x810 fs/ocfs2/dir.c:812 Code: 20 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 7a f8 77 fe 48 8b 03 48 89 44 24 30 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c0 03 00 00 45 8b 3c 24 4c 89 f0 48 c1 RSP: 0018:ffffc9000d2b6b40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888043f708b8 RCX: 0000000000100000 RDX: ffffc9000f2f4000 RSI: 00000000000022c8 RDI: ffff888043f708a0 RBP: ffffc9000d2b6c50 R08: ffffffff838de86e R09: ffffc9000d2b6ce0 R10: 0000000000000002 R11: ffff88801f300000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888053db52c0 R15: ffff888053db52c0 FS: 00007f6e7b9f56c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffc474bc08 CR3: 0000000043142000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ocfs2_dx_dir_lookup+0x163/0x930 fs/ocfs2/dir.c:860 ocfs2_dx_dir_search fs/ocfs2/dir.c:920 [inline] ocfs2_find_entry_dx fs/ocfs2/dir.c:1034 [inline] ocfs2_find_entry+0x1309/0x2570 fs/ocfs2/dir.c:1071 ocfs2_check_dir_for_entry+0x17b/0x4a0 fs/ocfs2/dir.c:2040 ocfs2_mknod+0x83c/0x2b30 fs/ocfs2/namei.c:288 ocfs2_create+0x1ab/0x470 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3649 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x1c03/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6e7f585d29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f6e7b9f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6e7f776160 RCX: 00007f6e7f585d29 RDX: 000000000000275a RSI: 00000000200001c0 RDI: ffffffffffffff9c RBP: 00007f6e7f601b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f6e7f776160 R15: 00007ffe0d4b3628 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_dx_dir_lookup_rec+0x325/0x810 fs/ocfs2/dir.c:812 Code: 20 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 7a f8 77 fe 48 8b 03 48 89 44 24 30 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c0 03 00 00 45 8b 3c 24 4c 89 f0 48 c1 RSP: 0018:ffffc9000d2b6b40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888043f708b8 RCX: 0000000000100000 RDX: ffffc9000f2f4000 RSI: 00000000000022c8 RDI: ffff888043f708a0 RBP: ffffc9000d2b6c50 R08: ffffffff838de86e R09: ffffc9000d2b6ce0 R10: 0000000000000002 R11: ffff88801f300000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888053db52c0 R15: ffff888053db52c0 FS: 00007f6e7b9f56c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d6100ab068 CR3: 0000000043142000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 20 48 83 and %cl,-0x7d(%rax) 3: c3 ret 4: 40 rex 5: 48 89 d8 mov %rbx,%rax 8: 48 c1 e8 03 shr $0x3,%rax c: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 11: 74 08 je 0x1b 13: 48 89 df mov %rbx,%rdi 16: e8 7a f8 77 fe call 0xfe77f895 1b: 48 8b 03 mov (%rbx),%rax 1e: 48 89 44 24 30 mov %rax,0x30(%rsp) 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 c0 03 00 00 jne 0x3f7 37: 45 8b 3c 24 mov (%r12),%r15d 3b: 4c 89 f0 mov %r14,%rax 3e: 48 rex.W 3f: c1 .byte 0xc1