general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 286 Comm: syz-executor974 Not tainted 5.10.209-syzkaller-00423-gfc10db4b1932 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:vfs_link+0x3c/0x890 fs/namei.c:4175 Code: 89 4d a0 49 89 d4 49 89 f6 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 43 a0 b6 ff 48 89 5d a8 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 25 17 f4 ff 48 8b 03 48 89 45 d0 RSP: 0018:ffffc90000967bd0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88811e28cf00 RDX: 0000000000000000 RSI: ffff8881105c6018 RDI: 0000000000000000 RBP: ffffc90000967c30 R08: dffffc0000000000 R09: ffffed10220b8c19 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c4ceee0 R13: ffffc90000967cc8 R14: ffff8881105c6018 R15: dffffc0000000000 FS: 000055555608d480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000011e27b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: incfs_link fs/incfs/vfs.c:604 [inline] dir_link+0x37f/0x510 fs/incfs/vfs.c:1279 vfs_link+0x68f/0x890 fs/namei.c:4219 do_linkat+0x471/0x8b0 fs/namei.c:4287 __do_sys_linkat fs/namei.c:4311 [inline] __se_sys_linkat fs/namei.c:4308 [inline] __x64_sys_linkat+0xbf/0xd0 fs/namei.c:4308 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f24cc713c69 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe3ec91ab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000109 RAX: ffffffffffffffda RBX: 00007ffe3ec91ac0 RCX: 00007f24cc713c69 RDX: 0000000000000004 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007ffe3ec91ac8 R08: 0000000000000000 R09: 00007f24cc6e3be0 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe3ec91d28 R14: 0000000000000001 R15: 0000000000000001 Modules linked in: ---[ end trace cc29ddc6fbc81186 ]--- RIP: 0010:vfs_link+0x3c/0x890 fs/namei.c:4175 Code: 89 4d a0 49 89 d4 49 89 f6 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 43 a0 b6 ff 48 89 5d a8 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 25 17 f4 ff 48 8b 03 48 89 45 d0 RSP: 0018:ffffc90000967bd0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88811e28cf00 RDX: 0000000000000000 RSI: ffff8881105c6018 RDI: 0000000000000000 RBP: ffffc90000967c30 R08: dffffc0000000000 R09: ffffed10220b8c19 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c4ceee0 R13: ffffc90000967cc8 R14: ffff8881105c6018 R15: dffffc0000000000 FS: 000055555608d480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000011e27b000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 4d a0 mov %ecx,-0x60(%rbp) 3: 49 89 d4 mov %rdx,%r12 6: 49 89 f6 mov %rsi,%r14 9: 48 89 fb mov %rdi,%rbx c: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 13: fc ff df 16: e8 43 a0 b6 ff call 0xffb6a05e 1b: 48 89 5d a8 mov %rbx,-0x58(%rbp) 1f: 48 83 c3 30 add $0x30,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 25 17 f4 ff call 0xfff4175e 39: 48 8b 03 mov (%rbx),%rax 3c: 48 89 45 d0 mov %rax,-0x30(%rbp)