syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 291 Comm: syz-executor309 Not tainted 5.15.189-syzkaller-00079-ga71626bd56a5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:3341 [inline]
RIP: 0010:lookup_open fs/namei.c:3433 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3532 [inline]
RIP: 0010:path_openat+0x11ff/0x2f10 fs/namei.c:3739
Code: 48 89 df e8 03 81 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 05 f8 ff ff eb 62 e8 3c 25 b7 ff 4c 8b 2c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 6b 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000a279c0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff888105980000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888105980000
RBP: ffffc90000a27bd0 R08: dffffc0000000000 R09: ffffed1024136a94
R10: ffffed1024136a94 R11: 1ffff11024136a93 R12: 0000000000000002
R13: ffffc90000a27c20 R14: ffff8881239df518 R15: dffffc0000000000
FS:  00007fb6a3e196c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6a3e19d58 CR3: 000000012465d000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x14c/0x7b0 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_open fs/open.c:1258 [inline]
 __se_sys_open fs/open.c:1254 [inline]
 __x64_sys_open+0x11c/0x140 fs/open.c:1254
 x64_sys_call+0x3fc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:3
 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: 0033:0x7fb6a3e78779
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb6a3e19218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb6a3f053f8 RCX: 00007fb6a3e78779
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00002000000001c0
RBP: 00007fb6a3f053f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb6a3ed203c
R13: 00002000000042c0 R14: 00002000000001c0 R15: 00007fffc1cb8298
 </TASK>
Modules linked in:
---[ end trace 7d7566fa25a57bad ]---
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:3341 [inline]
RIP: 0010:lookup_open fs/namei.c:3433 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3532 [inline]
RIP: 0010:path_openat+0x11ff/0x2f10 fs/namei.c:3739
Code: 48 89 df e8 03 81 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 05 f8 ff ff eb 62 e8 3c 25 b7 ff 4c 8b 2c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 6b 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000a279c0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff888105980000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888105980000
RBP: ffffc90000a27bd0 R08: dffffc0000000000 R09: ffffed1024136a94
R10: ffffed1024136a94 R11: 1ffff11024136a93 R12: 0000000000000002
R13: ffffc90000a27c20 R14: ffff8881239df518 R15: dffffc0000000000
FS:  00007fb6a3e196c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e555fec028 CR3: 000000012465d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 89 df             	mov    %rbx,%rdi
   3:	e8 03 81 02 00       	call   0x2810b
   8:	49 63 de             	movslq %r14d,%rbx
   b:	48 81 fb 00 f0 ff ff 	cmp    $0xfffffffffffff000,%rbx
  12:	0f 87 05 f8 ff ff    	ja     0xfffff81d
  18:	eb 62                	jmp    0x7c
  1a:	e8 3c 25 b7 ff       	call   0xffb7255b
  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 6b 0d 00 00    	jne    0xda2
  37:	44 8b 33             	mov    (%rbx),%r14d
  3a:	be 00 00 70 00       	mov    $0x700000,%esi
  3f:	44                   	rex.R