Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5354 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:diRead+0x420/0xb90 fs/jfs/jfs_imap.c:342 Code: 3c 08 00 4c 8b 7c 24 10 74 08 4c 89 f7 e8 28 94 dd fe 49 8b 1e 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 a4 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc9000b37f6f8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: 000000000000001c R08: ffff8880477c1c47 R09: 1ffff11008ef8388 R10: dffffc0000000000 R11: ffffed1008ef8389 R12: 0000000000000000 R13: ffff8880378a08b8 R14: ffff8880114b0ea0 R15: 0000000000000000 FS: 00007f705d1b36c0(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4fe8bba000 CR3: 000000003aa48000 CR4: 0000000000352ef0 Call Trace: jfs_iget+0x89/0x470 fs/jfs/inode.c:35 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1469 __lookup_slow+0x2b7/0x410 fs/namei.c:1866 lookup_slow+0x53/0x70 fs/namei.c:1883 walk_component fs/namei.c:2229 [inline] lookup_last fs/namei.c:2730 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2754 filename_lookup+0x256/0x5d0 fs/namei.c:2783 do_linkat+0x126/0x5b0 fs/namei.c:5705 __do_sys_link fs/namei.c:5759 [inline] __se_sys_link fs/namei.c:5757 [inline] __x64_sys_link+0x82/0x90 fs/namei.c:5757 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7060d9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f705d1b3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 RAX: ffffffffffffffda RBX: 00007f7061016180 RCX: 00007f7060d9acb9 RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000200000000200 RBP: 00007f7060e08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7061016218 R14: 00007f7061016180 R15: 00007ffca93759a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:diRead+0x420/0xb90 fs/jfs/jfs_imap.c:342 Code: 3c 08 00 4c 8b 7c 24 10 74 08 4c 89 f7 e8 28 94 dd fe 49 8b 1e 48 83 c3 34 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 a4 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc9000b37f6f8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: 000000000000001c R08: ffff8880477c1c47 R09: 1ffff11008ef8388 R10: dffffc0000000000 R11: ffffed1008ef8389 R12: 0000000000000000 R13: ffff8880378a08b8 R14: ffff8880114b0ea0 R15: 0000000000000000 FS: 00007f705d1b36c0(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000c3f000 CR3: 000000003aa48000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 3c 08 cmp $0x8,%al 2: 00 4c 8b 7c add %cl,0x7c(%rbx,%rcx,4) 6: 24 10 and $0x10,%al 8: 74 08 je 0x12 a: 4c 89 f7 mov %r14,%rdi d: e8 28 94 dd fe call 0xfedd943a 12: 49 8b 1e mov (%r14),%rbx 15: 48 83 c3 34 add $0x34,%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 a4 05 00 00 jne 0x5da 36: 8b 1b mov (%rbx),%ebx 38: bf 40 00 00 00 mov $0x40,%edi 3d: 89 de mov %ebx,%esi 3f: e8 .byte 0xe8