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: 375 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:atomic_open fs/namei.c:3368 [inline]
RIP: 0010:lookup_open fs/namei.c:3460 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3557 [inline]
RIP: 0010:path_openat+0x15f7/0x2f30 fs/namei.c:3787
Code: 5f a7 ae ff bb f3 ff ff ff 4c 89 f7 e8 32 8b 02 00 4c 63 f3 e9 fe f3 ff ff e8 45 a7 ae ff 4c 8b 6c 24 08 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 cd 07 00 00 41 8b 1e be 00 00 70 00 21
RSP: 0018:ffffc90000987980 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff8881143f7998 RCX: ffff888114155100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888114155100
RBP: ffffc90000987b70 R08: ffffc900009878a7 R09: 1ffff92000130f14
R10: dffffc0000000000 R11: fffff52000130f15 R12: 0000000000000000
R13: ffffc90000987be0 R14: 0000000000000008 R15: dffffc0000000000
FS:  00007f763665d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76357ea540 CR3: 000000012c0b0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x1ee/0x420 fs/namei.c:3817
 do_sys_openat2+0x15e/0x820 fs/open.c:1343
 do_sys_open fs/open.c:1359 [inline]
 __do_sys_openat fs/open.c:1375 [inline]
 __se_sys_openat fs/open.c:1370 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1370
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f763579ce59
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:00007f763665d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f7635a15fa0 RCX: 00007f763579ce59
RDX: 0000000000040000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f7635832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7635a16038 R14: 00007f7635a15fa0 R15: 00007ffee14c1c38
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:atomic_open fs/namei.c:3368 [inline]
RIP: 0010:lookup_open fs/namei.c:3460 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3557 [inline]
RIP: 0010:path_openat+0x15f7/0x2f30 fs/namei.c:3787
Code: 5f a7 ae ff bb f3 ff ff ff 4c 89 f7 e8 32 8b 02 00 4c 63 f3 e9 fe f3 ff ff e8 45 a7 ae ff 4c 8b 6c 24 08 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 cd 07 00 00 41 8b 1e be 00 00 70 00 21
RSP: 0018:ffffc90000987980 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff8881143f7998 RCX: ffff888114155100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888114155100
RBP: ffffc90000987b70 R08: ffffc900009878a7 R09: 1ffff92000130f14
R10: dffffc0000000000 R11: fffff52000130f15 R12: 0000000000000000
R13: ffffc90000987be0 R14: 0000000000000008 R15: dffffc0000000000
FS:  00007f763665d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76357ea540 CR3: 000000012c0b0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	bb f3 ff ff ff       	mov    $0xfffffff3,%ebx
   5:	4c 89 f7             	mov    %r14,%rdi
   8:	e8 32 8b 02 00       	call   0x28b3f
   d:	4c 63 f3             	movslq %ebx,%r14
  10:	e9 fe f3 ff ff       	jmp    0xfffff413
  15:	e8 45 a7 ae ff       	call   0xffaea75f
  1a:	4c 8b 6c 24 08       	mov    0x8(%rsp),%r13
  1f:	4c 89 f0             	mov    %r14,%rax
  22:	48 c1 e8 03          	shr    $0x3,%rax
* 26:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2b:	84 c0                	test   %al,%al
  2d:	0f 85 cd 07 00 00    	jne    0x800
  33:	41 8b 1e             	mov    (%r14),%ebx
  36:	be 00 00 70 00       	mov    $0x700000,%esi
  3b:	21                   	.byte 0x21