BUG: unable to handle page fault for address: ffffdc0000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 12026067 P4D 12026067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1099 Comm: kworker/u4:0 Not tainted 6.0.0-rc1-syzkaller-00017-g3cc40a443a04 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:strnlen+0x37/0x80 lib/string.c:504
Code: 49 89 fc 48 85 f6 74 57 49 89 f7 4d 8d 2c 36 48 bd 00 00 00 00 00 fc ff df 4c 89 f3 4d 89 f4 0f 1f 40 00 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 75 17 41 80 3c 24 00 74 26 49 ff cf 49 ff c4 48
RSP: 0000:ffffc9000566fd68 EFLAGS: 00010a06
RAX: 1fffe00000000000 RBX: ffff000000000000 RCX: ffff888021209d80
RDX: 0000000000000000 RSI: 0000000000020000 RDI: ffff000000000000
RBP: dffffc0000000000 R08: ffffffff81ed7569 R09: fffff9400007caaf
R10: fffff9400007caaf R11: 1ffffd400007caae R12: ffff000000000000
R13: ffff000000020000 R14: ffff000000000000 R15: 0000000000020000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 000000000ca8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 copy_string_kernel+0x81/0x510 fs/exec.c:616
 copy_strings_kernel fs/exec.c:655 [inline]
 kernel_execve+0x685/0xa00 fs/exec.c:2001
 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:112
 ret_from_fork+0x1f/0x30
 </TASK>
Modules linked in:
CR2: ffffdc0000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:strnlen+0x37/0x80 lib/string.c:504
Code: 49 89 fc 48 85 f6 74 57 49 89 f7 4d 8d 2c 36 48 bd 00 00 00 00 00 fc ff df 4c 89 f3 4d 89 f4 0f 1f 40 00 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 75 17 41 80 3c 24 00 74 26 49 ff cf 49 ff c4 48
RSP: 0000:ffffc9000566fd68 EFLAGS: 00010a06
RAX: 1fffe00000000000 RBX: ffff000000000000 RCX: ffff888021209d80
RDX: 0000000000000000 RSI: 0000000000020000 RDI: ffff000000000000
RBP: dffffc0000000000 R08: ffffffff81ed7569 R09: fffff9400007caaf
R10: fffff9400007caaf R11: 1ffffd400007caae R12: ffff000000000000
R13: ffff000000020000 R14: ffff000000000000 R15: 0000000000020000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 000000000ca8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 89 fc             	mov    %rdi,%r12
   3:	48 85 f6             	test   %rsi,%rsi
   6:	74 57                	je     0x5f
   8:	49 89 f7             	mov    %rsi,%r15
   b:	4d 8d 2c 36          	lea    (%r14,%rsi,1),%r13
   f:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
  16:	fc ff df
  19:	4c 89 f3             	mov    %r14,%rbx
  1c:	4d 89 f4             	mov    %r14,%r12
  1f:	0f 1f 40 00          	nopl   0x0(%rax)
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	75 17                	jne    0x49
  32:	41 80 3c 24 00       	cmpb   $0x0,(%r12)
  37:	74 26                	je     0x5f
  39:	49 ff cf             	dec    %r15
  3c:	49 ff c4             	inc    %r12
  3f:	48                   	rex.W