general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 4070 Comm: syz.2.769 Not tainted 5.10.225-syzkaller-00513-g8d23314f588a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:traverse_mounts fs/namei.c:1357 [inline]
RIP: 0010:handle_mounts fs/namei.c:1477 [inline]
RIP: 0010:step_into+0x1b9/0xec0 fs/namei.c:1782
Code: 24 0f 85 cf 0a 00 00 44 8b 3a 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 86 95 f3 ff 48 8b 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c1 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc90000b579a0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000019 RCX: 0000000000040000
RDX: ffffc90000b57cf8 RSI: 00000000000001a4 RDI: 00000000000001a5
RBP: ffffc90000b57ad0 R08: ffffffff81b4b10f R09: ffffed10247c1375
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200016af4b
R13: dffffc0000000000 R14: ffffc90000b57cc0 R15: 0000000000000001
FS:  00007ff3891ac6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020006000 CR3: 000000010bacf000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 walk_component+0x359/0x610 fs/namei.c:1958
 lookup_last fs/namei.c:2403 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2427
 filename_lookup+0x26a/0x6f0 fs/namei.c:2460
 user_path_at_empty+0x40/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 do_fchmodat fs/open.c:620 [inline]
 __do_sys_fchmodat fs/open.c:635 [inline]
 __se_sys_fchmodat fs/open.c:632 [inline]
 __x64_sys_fchmodat+0xfd/0x1a0 fs/open.c:632
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff38a532ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff3891ac038 EFLAGS: 00000246 ORIG_RAX: 000000000000010c
RAX: ffffffffffffffda RBX: 00007ff38a6eaf80 RCX: 00007ff38a532ef9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007ff38a5a5b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff38a6eaf80 R15: 00007ffdc9465258
Modules linked in:
---[ end trace 0067c4d22c75a2a3 ]---
RIP: 0010:traverse_mounts fs/namei.c:1357 [inline]
RIP: 0010:handle_mounts fs/namei.c:1477 [inline]
RIP: 0010:step_into+0x1b9/0xec0 fs/namei.c:1782
Code: 24 0f 85 cf 0a 00 00 44 8b 3a 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 86 95 f3 ff 48 8b 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c1 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc90000b579a0 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000019 RCX: 0000000000040000
RDX: ffffc90000b57cf8 RSI: 00000000000001a4 RDI: 00000000000001a5
RBP: ffffc90000b57ad0 R08: ffffffff81b4b10f R09: ffffed10247c1375
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200016af4b
R13: dffffc0000000000 R14: ffffc90000b57cc0 R15: 0000000000000001
FS:  00007ff3891ac6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32903ff8 CR3: 000000010bacf000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	24 0f                	and    $0xf,%al
   2:	85 cf                	test   %ecx,%edi
   4:	0a 00                	or     (%rax),%al
   6:	00 44 8b 3a          	add    %al,0x3a(%rbx,%rcx,4)
   a:	43 80 3c 2c 00       	cmpb   $0x0,(%r12,%r13,1)
   f:	74 0a                	je     0x1b
  11:	48 8b 7c 24 18       	mov    0x18(%rsp),%rdi
  16:	e8 86 95 f3 ff       	call   0xfff395a1
  1b:	48 8b 9c 24 b8 00 00 	mov    0xb8(%rsp),%rbx
  22:	00
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 c1 0a 00 00    	jne    0xaf8
  37:	8b 1b                	mov    (%rbx),%ebx
  39:	89 de                	mov    %ebx,%esi
  3b:	81                   	.byte 0x81
  3c:	e6 00                	out    %al,$0x0
  3e:	00 07                	add    %al,(%rdi)