syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 298 Comm: syz-executor694 Not tainted 5.15.167-syzkaller-android13-5.15.167_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:traverse_mounts fs/namei.c:1378 [inline]
RIP: 0010:handle_mounts fs/namei.c:1498 [inline]
RIP: 0010:step_into+0x1b6/0xe70 fs/namei.c:1806
Code: 20 0f 85 99 0a 00 00 44 8b 3b 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 c9 b9 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 86 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc900009a77a0 EFLAGS: 00010203
RAX: 0000000000000001 RBX: 000000000000000f RCX: ffff88811a4cbb40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009a78d0 R08: ffffffff81beef50 R09: ffffed10245bf935
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000134f0b
R13: dffffc0000000000 R14: ffffc900009a7ba0 R15: 0000000000000010
FS:  00007f3dd476d6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dd476dd58 CR3: 000000011fa90000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x359/0x610 fs/namei.c:1982
 link_path_walk+0x642/0xd90
 path_parentat fs/namei.c:2502 [inline]
 __filename_parentat+0x24c/0x6c0 fs/namei.c:2526
 filename_parentat fs/namei.c:2544 [inline]
 filename_create+0xf2/0x530 fs/namei.c:3816
 do_mkdirat+0xbd/0x450 fs/namei.c:4080
 __do_sys_mkdir fs/namei.c:4110 [inline]
 __se_sys_mkdir fs/namei.c:4108 [inline]
 __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4108
 x64_sys_call+0x26d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3dd47ce4c7
Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 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:00007f3dd476d0f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f3dd48593f8 RCX: 00007f3dd47ce4c7
RDX: 00000000000f4240 RSI: 00000000000001ff RDI: 0000000020000200
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffead431657 R11: 0000000000000206 R12: 00007f3dd482605c
R13: 0030656c69662f2e R14: 00007f3dd4826078 R15: 00007ffead431658
 </TASK>
Modules linked in:
---[ end trace 0a93be4ecbe70ea8 ]---
RIP: 0010:traverse_mounts fs/namei.c:1378 [inline]
RIP: 0010:handle_mounts fs/namei.c:1498 [inline]
RIP: 0010:step_into+0x1b6/0xe70 fs/namei.c:1806
Code: 20 0f 85 99 0a 00 00 44 8b 3b 43 80 3c 2c 00 74 0a 48 8b 7c 24 18 e8 c9 b9 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 86 0a 00 00 8b 1b 89 de 81 e6 00 00 07
RSP: 0018:ffffc900009a77a0 EFLAGS: 00010203
RAX: 0000000000000001 RBX: 000000000000000f RCX: ffff88811a4cbb40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009a78d0 R08: ffffffff81beef50 R09: ffffed10245bf935
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000134f0b
R13: dffffc0000000000 R14: ffffc900009a7ba0 R15: 0000000000000010
FS:  00007f3dd476d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c2d91090d8 CR3: 000000011fa90000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 0f                	and    %cl,(%rdi)
   2:	85 99 0a 00 00 44    	test   %ebx,0x4400000a(%rcx)
   8:	8b 3b                	mov    (%rbx),%edi
   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 c9 b9 f3 ff       	call   0xfff3b9e4
  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 86 0a 00 00    	jne    0xabd
  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)