loop0: detected capacity change from 32768 to 32767 OCFS2: ERROR (device loop0): int ocfs2_validate_dx_root(struct super_block *, struct buffer_head *): Dir Index Root # 5953855948323164685 has bad signature On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. OCFS2: File system is now read-only. (syz.0.0,5314,0):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: 5314 Comm: syz.0.0 Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #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 1a 63 75 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:ffffc900019cf360 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888043f408b8 RCX: 0000000000100000 RDX: ffffc9000f243000 RSI: 0000000000000312 RDI: ffff888043f408a0 RBP: ffffc900019cf470 R08: ffffffff8394fa6e R09: ffffc900019cf500 R10: 0000000000000002 R11: ffff8880009f0000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888053b1f2c0 R15: ffff888053b1f2c0 FS: 00007f85547156c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001000 CR3: 0000000044278000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0x1338/0x2730 fs/ocfs2/dir.c:1070 ocfs2_find_files_on_disk+0xff/0x360 fs/ocfs2/dir.c:1981 ocfs2_lookup_ino_from_name+0xb1/0x1e0 fs/ocfs2/dir.c:2003 ocfs2_lookup+0x292/0xa30 fs/ocfs2/namei.c:122 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1692 filename_create+0x297/0x540 fs/namei.c:4081 do_linkat+0x1a2/0x6f0 fs/namei.c:4847 __do_sys_link fs/namei.c:4897 [inline] __se_sys_link fs/namei.c:4895 [inline] __x64_sys_link+0x82/0x90 fs/namei.c:4895 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: 0033:0x7f855397fed9 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:00007f8554715058 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 RAX: ffffffffffffffda RBX: 00007f8553b46080 RCX: 00007f855397fed9 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 00000000200000c0 RBP: 00007f85539f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8553b46080 R15: 00007ffe231d66f8 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 1a 63 75 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:ffffc900019cf360 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888043f408b8 RCX: 0000000000100000 RDX: ffffc9000f243000 RSI: 0000000000000312 RDI: ffff888043f408a0 RBP: ffffc900019cf470 R08: ffffffff8394fa6e R09: ffffc900019cf500 R10: 0000000000000002 R11: ffff8880009f0000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888053b1f2c0 R15: ffff888053b1f2c0 FS: 00007f85547156c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a46bb81078 CR3: 0000000044278000 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 1a 63 75 fe call 0xfe756335 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