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: 348 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:vfs_link+0x40/0x800 fs/namei.c:4562 Code: 89 4d c0 49 89 d6 49 89 f4 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 7f 70 af 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 e1 ea f3 ff 4c 89 65 c8 48 8b 03 RSP: 0018:ffffc900014b7c50 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff888112898000 RDX: 0000000000000000 RSI: ffffffff86ef8460 RDI: 0000000000000000 RBP: ffffc900014b7cb0 R08: 0000000000000000 R09: ffffed10216e231f R10: ffffed10216e231f R11: 1ffff110216e231e R12: ffffffff86ef8460 R13: ffff8881134e2040 R14: ffff88810b711848 R15: dffffc0000000000 FS: 00007efc8746c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000011102d000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: incfs_link fs/incfs/vfs.c:648 [inline] dir_link+0x305/0x470 fs/incfs/vfs.c:1321 vfs_link+0x64b/0x800 fs/namei.c:4606 do_linkat+0x1e7/0x730 fs/namei.c:4677 __do_sys_linkat fs/namei.c:4705 [inline] __se_sys_linkat fs/namei.c:4702 [inline] __x64_sys_linkat+0xe4/0x100 fs/namei.c:4702 x64_sys_call+0x4e3/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:266 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7efc8667dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efc8746c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000109 RAX: ffffffffffffffda RBX: 00007efc867ac050 RCX: 00007efc8667dda9 RDX: 0000000000000004 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007efc866ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007efc867ac050 R15: 00007ffc60bc1788 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vfs_link+0x40/0x800 fs/namei.c:4562 Code: 89 4d c0 49 89 d6 49 89 f4 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 7f 70 af 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 e1 ea f3 ff 4c 89 65 c8 48 8b 03 RSP: 0018:ffffc900014b7c50 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff888112898000 RDX: 0000000000000000 RSI: ffffffff86ef8460 RDI: 0000000000000000 RBP: ffffc900014b7cb0 R08: 0000000000000000 R09: ffffed10216e231f R10: ffffed10216e231f R11: 1ffff110216e231e R12: ffffffff86ef8460 R13: ffff8881134e2040 R14: ffff88810b711848 R15: dffffc0000000000 FS: 00007efc8746c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020cce000 CR3: 000000011102d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 4d c0 mov %ecx,-0x40(%rbp) 3: 49 89 d6 mov %rdx,%r14 6: 49 89 f4 mov %rsi,%r12 9: 48 89 fb mov %rdi,%rbx c: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 13: fc ff df 16: e8 7f 70 af ff call 0xffaf709a 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 e1 ea f3 ff call 0xfff3eb1a 39: 4c 89 65 c8 mov %r12,-0x38(%rbp) 3d: 48 8b 03 mov (%rbx),%rax