ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 5829 Comm: syz.0.16 Not tainted syzkaller #0 PREEMPT(full) 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_find_dir_space_id fs/ocfs2/dir.c:3432 [inline] RIP: 0010:ocfs2_prepare_dir_for_insert+0x2f41/0x5450 fs/ocfs2/dir.c:4296 Code: ca 8b e8 c2 9b 19 00 e9 fd 11 00 00 e8 78 94 23 fe e9 a7 02 00 00 e8 6e 94 23 fe 49 8d 7f 08 4d 8d 77 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 41 20 00 00 4c 89 f0 48 c1 e8 03 42 0f RSP: 0018:ffffc90002a2e320 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff888043aede48 RCX: ffff888033db2440 RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008 RBP: ffffc90002a2ea30 R08: ffffc90002a2ec90 R09: 608b7c562adf3b03 R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: dffffc0000000000 R13: ffff888043aeddf8 R14: 0000000000000009 R15: 0000000000000000 FS: 00007f5af4e356c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5af3f61ac0 CR3: 000000005930a000 CR4: 0000000000352ef0 Call Trace: __ocfs2_prepare_orphan_dir+0x145/0x2c0 fs/ocfs2/namei.c:2179 ocfs2_prepare_orphan_dir+0xf9/0x3f0 fs/ocfs2/namei.c:2224 ocfs2_add_inode_to_orphan+0x1d6/0x710 fs/ocfs2/namei.c:2672 ocfs2_dio_wr_get_block+0x7ea/0x1770 fs/ocfs2/aops.c:2186 get_more_blocks fs/direct-io.c:648 [inline] do_direct_IO fs/direct-io.c:936 [inline] __blockdev_direct_IO+0x16fc/0x3490 fs/direct-io.c:1243 ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2441 generic_file_direct_write+0x1d8/0x3e0 mm/filemap.c:4109 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4278 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469 iter_file_splice_write+0x975/0x10e0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0xfe/0x160 fs/splice.c:1161 splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x181/0x270 fs/splice.c:1230 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5af3f8e929 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:00007f5af4e35038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5af41b5fa0 RCX: 00007f5af3f8e929 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f5af4010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000080000002 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5af41b5fa0 R15: 00007ffda43f5ce8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_find_dir_space_id fs/ocfs2/dir.c:3432 [inline] RIP: 0010:ocfs2_prepare_dir_for_insert+0x2f41/0x5450 fs/ocfs2/dir.c:4296 Code: ca 8b e8 c2 9b 19 00 e9 fd 11 00 00 e8 78 94 23 fe e9 a7 02 00 00 e8 6e 94 23 fe 49 8d 7f 08 4d 8d 77 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 41 20 00 00 4c 89 f0 48 c1 e8 03 42 0f RSP: 0018:ffffc90002a2e320 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffff888043aede48 RCX: ffff888033db2440 RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008 RBP: ffffc90002a2ea30 R08: ffffc90002a2ec90 R09: 608b7c562adf3b03 R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: dffffc0000000000 R13: ffff888043aeddf8 R14: 0000000000000009 R15: 0000000000000000 FS: 00007f5af4e356c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5af3f61ac0 CR3: 000000005930a000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: ca 8b e8 lret $0xe88b 3: c2 9b 19 ret $0x199b 6: 00 e9 add %ch,%cl 8: fd std 9: 11 00 adc %eax,(%rax) b: 00 e8 add %ch,%al d: 78 94 js 0xffffffa3 f: 23 fe and %esi,%edi 11: e9 a7 02 00 00 jmp 0x2bd 16: e8 6e 94 23 fe call 0xfe239489 1b: 49 8d 7f 08 lea 0x8(%r15),%rdi 1f: 4d 8d 77 09 lea 0x9(%r15),%r14 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 41 20 00 00 jne 0x2078 37: 4c 89 f0 mov %r14,%rax 3a: 48 c1 e8 03 shr $0x3,%rax 3e: 42 rex.X 3f: 0f .byte 0xf