kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 417 Comm: syz-executor.0 Not tainted 5.4.278-syzkaller-04928-gf076c16c9840 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:vfs_link+0x3b/0x8a0 fs/namei.c:4346
Code: 24 30 49 89 d6 49 89 f5 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 e5 03 c6 ff 48 89 5c 24 28 48 83 c3 30 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 07 ea f5 ff 48 8b 2b 4d 8d 7d 28 4d
RSP: 0018:ffff8881ef397bb0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881f32f0000
RDX: 0000000000000000 RSI: ffff8881e93a3490 RDI: 0000000000000000
RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed103d2746a8
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881dad02770
R13: ffff8881e93a3490 R14: ffff8881dad02770 R15: ffff8881e93a3490
FS:  00007ff7f3cdc6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000208a6000 CR3: 00000001d977f000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 incfs_link fs/incfs/vfs.c:603 [inline]
 dir_link+0x37f/0x510 fs/incfs/vfs.c:1278
 vfs_link+0x69b/0x8a0 fs/namei.c:4390
 do_linkat+0x46c/0x8b0 fs/namei.c:4458
 __do_sys_linkat fs/namei.c:4482 [inline]
 __se_sys_linkat fs/namei.c:4479 [inline]
 __x64_sys_linkat+0xb1/0xc0 fs/namei.c:4479
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7ff7f417bda9
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:00007ff7f3cdc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000109
RAX: ffffffffffffffda RBX: 00007ff7f42aa050 RCX: 00007ff7f417bda9
RDX: 0000000000000004 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007ff7f41c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff7f42aa050 R15: 00007ffeedcc7a88
Modules linked in:
---[ end trace 9b7da305385341b0 ]---
RIP: 0010:vfs_link+0x3b/0x8a0 fs/namei.c:4346
Code: 24 30 49 89 d6 49 89 f5 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 e5 03 c6 ff 48 89 5c 24 28 48 83 c3 30 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 07 ea f5 ff 48 8b 2b 4d 8d 7d 28 4d
RSP: 0018:ffff8881ef397bb0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881f32f0000
RDX: 0000000000000000 RSI: ffff8881e93a3490 RDI: 0000000000000000
RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed103d2746a8
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881dad02770
R13: ffff8881e93a3490 R14: ffff8881dad02770 R15: ffff8881e93a3490
FS:  00007ff7f3cdc6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000208a6000 CR3: 00000001d977f000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	24 30                	and    $0x30,%al
   2:	49 89 d6             	mov    %rdx,%r14
   5:	49 89 f5             	mov    %rsi,%r13
   8:	48 89 fb             	mov    %rdi,%rbx
   b:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
  12:	fc ff df
  15:	e8 e5 03 c6 ff       	call   0xffc603ff
  1a:	48 89 5c 24 28       	mov    %rbx,0x28(%rsp)
  1f:	48 83 c3 30          	add    $0x30,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 07 ea f5 ff       	call   0xfff5ea3f
  38:	48 8b 2b             	mov    (%rbx),%rbp
  3b:	4d 8d 7d 28          	lea    0x28(%r13),%r15
  3f:	4d                   	rex.WRB