syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 372 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:atomic_open fs/namei.c:3349 [inline]
RIP: 0010:lookup_open fs/namei.c:3441 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3540 [inline]
RIP: 0010:path_openat+0x11df/0x2f20 fs/namei.c:3747
Code: eb 0b e8 54 46 b6 ff 41 be f3 ff ff ff 48 89 df e8 16 8d 02 00 49 63 de eb 55 e8 3c 46 b6 ff 4c 8b 2c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000b578e0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88810fda93c0
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810fda93c0
RBP: ffffc90000b57af0 R08: ffff88810d246f3f R09: 1ffff11021a48de7
R10: dffffc0000000000 R11: ffffed1021a48de8 R12: 0000000000000000
R13: ffffc90000b57b60 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f68768246c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6876802ff8 CR3: 000000012138f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236
 __do_sys_openat2 fs/open.c:1293 [inline]
 __se_sys_openat2 fs/open.c:1271 [inline]
 __x64_sys_openat2+0x21c/0x290 fs/open.c:1271
 x64_sys_call+0x457/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:438
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f68769c1629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6876824028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b5
RAX: ffffffffffffffda RBX: 00007f6876c3afa0 RCX: 00007f68769c1629
RDX: 0000200000000100 RSI: 0000200000000000 RDI: 00000000ffffff9c
RBP: 00007f6876a57b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000018 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6876c3b038 R14: 00007f6876c3afa0 R15: 00007ffd33dec298
 </TASK>
Modules linked in:
---[ end trace 82710b3e49fe874f ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:atomic_open fs/namei.c:3349 [inline]
RIP: 0010:lookup_open fs/namei.c:3441 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3540 [inline]
RIP: 0010:path_openat+0x11df/0x2f20 fs/namei.c:3747
Code: eb 0b e8 54 46 b6 ff 41 be f3 ff ff ff 48 89 df e8 16 8d 02 00 49 63 de eb 55 e8 3c 46 b6 ff 4c 8b 2c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 9f 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000b578e0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88810fda93c0
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810fda93c0
RBP: ffffc90000b57af0 R08: ffff88810d246f3f R09: 1ffff11021a48de7
R10: dffffc0000000000 R11: ffffed1021a48de8 R12: 0000000000000000
R13: ffffc90000b57b60 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f68768246c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6876802ff8 CR3: 000000012138f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	eb 0b                	jmp    0xd
   2:	e8 54 46 b6 ff       	call   0xffb6465b
   7:	41 be f3 ff ff ff    	mov    $0xfffffff3,%r14d
   d:	48 89 df             	mov    %rbx,%rdi
  10:	e8 16 8d 02 00       	call   0x28d2b
  15:	49 63 de             	movslq %r14d,%rbx
  18:	eb 55                	jmp    0x6f
  1a:	e8 3c 46 b6 ff       	call   0xffb6465b
  1f:	4c 8b 2c 24          	mov    (%rsp),%r13
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 9f 0d 00 00    	jne    0xdd6
  37:	44 8b 33             	mov    (%rbx),%r14d
  3a:	be 00 00 70 00       	mov    $0x700000,%esi
  3f:	44                   	rex.R