Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 11818 Comm: syz.6.829 Not tainted syzk[ 410.114870][T11818] CPU: 0 UID: 0 PID: 11818 Comm: syz.6.829 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:diRead+0x41e/0xbc0 fs/jfs/jfs_imap.c:342 Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 5a 03 d8 fe 49 8b 1f 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 ca 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc90005e877f8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100c4339ca R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000024 R15: ffff888033410ea0 FS: 00007f31f7a2c6c0(0000) GS:ffff88812637d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd761f4eb8 CR3: 00000000563ea000 CR4: 00000000003526f0 Call Trace: jfs_iget+0x89/0x470 fs/jfs/inode.c:35 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1472 __lookup_slow+0x1fb/0x2f0 fs/namei.c:1919 lookup_slow+0x53/0x70 fs/namei.c:1936 walk_component fs/namei.c:2282 [inline] lookup_last fs/namei.c:2789 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2813 filename_lookup+0x265/0x5d0 fs/namei.c:2842 do_fchmodat+0xe4/0x230 fs/open.c:680 __do_sys_fchmodat fs/open.c:701 [inline] __se_sys_fchmodat fs/open.c:698 [inline] __x64_sys_fchmodat+0x7d/0x90 fs/open.c:698 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f31f981ce59 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:00007f31f7a2c028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007f31f9a96180 RCX: 00007f31f981ce59 RDX: 000000000000017f RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007f31f98b2d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f31f9a96218 R14: 00007f31f9a96180 R15: 00007ffd44b1b2d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:diRead+0x41e/0xbc0 fs/jfs/jfs_imap.c:342 Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 5a 03 d8 fe 49 8b 1f 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 ca 05 00 00 8b 1b bf 40 00 00 00 89 de e8 RSP: 0018:ffffc90005e877f8 EFLAGS: 00010207 RAX: 0000000000000006 RBX: 0000000000000034 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed100c4339ca R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000024 R15: ffff888033410ea0 FS: 00007f31f7a2c6c0(0000) GS:ffff88812637d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb0a3fef000 CR3: 00000000563ea000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 fc add %bh,%ah 2: ff lcall (bad) 3: df 80 3c 08 00 74 filds 0x7400083c(%rax) 9: 08 4c 89 ff or %cl,-0x1(%rcx,%rcx,4) d: e8 5a 03 d8 fe call 0xfed8036c 12: 49 8b 1f mov (%r15),%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 ca 05 00 00 jne 0x600 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