loop0: detected capacity change from 0 to 32768 (syz.0.0,5111,0):ocfs2_read_blocks:240 ERROR: status = -12 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5111 Comm: syz.0.0 Not tainted 6.11.0-rc7-syzkaller-00039-g77f587896757 #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_buffer_cached+0xcb/0x840 fs/ocfs2/uptodate.c:237 Code: bb 35 64 fe 4c 89 7c 24 20 4c 8b 5d 00 48 89 5c 24 08 48 89 df 41 ff d3 66 90 48 89 44 24 18 49 83 c5 18 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 86 35 64 fe 49 8b 55 00 48 8b 44 RSP: 0018:ffffc90002cee620 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffff888040a69670 RCX: dffffc0000000000 RDX: ffffc9000b799000 RSI: 0000000000024c4d RDI: 0000000000024c4e RBP: ffffffff8c491b80 R08: 0000000000000003 R09: fffff5200059dcb4 R10: dffffc0000000000 R11: ffffffff838754d0 R12: 0000000000000003 R13: 0000000000000018 R14: dffffc0000000000 R15: 1ffff1100814d2ce FS: 00007fb7f56d96c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8a3ecdd8 CR3: 0000000040c20000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ocfs2_set_buffer_uptodate+0xa1/0x1350 fs/ocfs2/uptodate.c:474 ocfs2_read_blocks+0x103e/0x1620 fs/ocfs2/buffer_head_io.c:392 ocfs2_read_virt_blocks+0x4c8/0xa50 fs/ocfs2/extent_map.c:1010 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x43b/0x2780 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xff/0x360 fs/ocfs2/dir.c:1980 ocfs2_lookup_ino_from_name+0xb1/0x1e0 fs/ocfs2/dir.c:2002 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x305/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x32c/0x730 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline] ocfs2_fill_super+0x3068/0x5880 fs/ocfs2/super.c:994 mount_bdev+0x20a/0x2d0 fs/super.c:1679 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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: 0033:0x7fb7f497f69a 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:00007fb7f56d8e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb7f56d8ef0 RCX: 00007fb7f497f69a RDX: 0000000020004480 RSI: 00000000200044c0 RDI: 00007fb7f56d8eb0 RBP: 0000000020004480 R08: 00007fb7f56d8ef0 R09: 0000000002800400 R10: 0000000002800400 R11: 0000000000000246 R12: 00000000200044c0 R13: 00007fb7f56d8eb0 R14: 000000000000446f R15: 00000000200001c0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_buffer_cached+0xcb/0x840 fs/ocfs2/uptodate.c:237 Code: bb 35 64 fe 4c 89 7c 24 20 4c 8b 5d 00 48 89 5c 24 08 48 89 df 41 ff d3 66 90 48 89 44 24 18 49 83 c5 18 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 86 35 64 fe 49 8b 55 00 48 8b 44 RSP: 0018:ffffc90002cee620 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffff888040a69670 RCX: dffffc0000000000 RDX: ffffc9000b799000 RSI: 0000000000024c4d RDI: 0000000000024c4e RBP: ffffffff8c491b80 R08: 0000000000000003 R09: fffff5200059dcb4 R10: dffffc0000000000 R11: ffffffff838754d0 R12: 0000000000000003 R13: 0000000000000018 R14: dffffc0000000000 R15: 1ffff1100814d2ce FS: 00007fb7f56d96c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8a3ecdd8 CR3: 0000000040c20000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: bb 35 64 fe 4c mov $0x4cfe6435,%ebx 5: 89 7c 24 20 mov %edi,0x20(%rsp) 9: 4c 8b 5d 00 mov 0x0(%rbp),%r11 d: 48 89 5c 24 08 mov %rbx,0x8(%rsp) 12: 48 89 df mov %rbx,%rdi 15: 41 ff d3 call *%r11 18: 66 90 xchg %ax,%ax 1a: 48 89 44 24 18 mov %rax,0x18(%rsp) 1f: 49 83 c5 18 add $0x18,%r13 23: 4d 89 ec mov %r13,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 43 80 3c 34 00 cmpb $0x0,(%r12,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 86 35 64 fe call 0xfe6435bf 39: 49 8b 55 00 mov 0x0(%r13),%rdx 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 44 rex.R