syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 293 Comm: syz-executor251 Not tainted 6.1.141-syzkaller-00040-g2dbfabb0eec8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:3360 [inline]
RIP: 0010:lookup_open fs/namei.c:3452 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3549 [inline]
RIP: 0010:path_openat+0x1235/0x2f50 fs/namei.c:3779
Code: 89 df e8 4e 88 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 cd f7 ff ff eb 63 e8 67 0a b0 ff 4c 8b 6c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 64 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000dd79a0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff88810def5100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810def5100
RBP: ffffc90000dd7bb0 R08: dffffc0000000000 R09: fffff520001baf19
R10: fffff520001baf19 R11: 1ffff920001baf18 R12: 0000000000000002
R13: ffffc90000dd7c00 R14: ffff88812559c018 R15: dffffc0000000000
FS:  00007f940c2086c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f940c208d58 CR3: 0000000125406000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x1c1/0x3c0 fs/namei.c:3809
 do_sys_openat2+0x185/0x7e0 fs/open.c:1341
 do_sys_open fs/open.c:1357 [inline]
 __do_sys_open fs/open.c:1365 [inline]
 __se_sys_open fs/open.c:1361 [inline]
 __x64_sys_open+0x11c/0x140 fs/open.c:1361
 x64_sys_call+0x97b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:3
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f940c267779
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:00007f940c208218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f940c2f43f8 RCX: 00007f940c267779
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00002000000001c0
RBP: 00007f940c2f43f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f940c2c103c
R13: 00002000000042c0 R14: 00002000000001c0 R15: 00007ffe095dcf08
 </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:3360 [inline]
RIP: 0010:lookup_open fs/namei.c:3452 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3549 [inline]
RIP: 0010:path_openat+0x1235/0x2f50 fs/namei.c:3779
Code: 89 df e8 4e 88 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 cd f7 ff ff eb 63 e8 67 0a b0 ff 4c 8b 6c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 64 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000dd79a0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff88810def5100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810def5100
RBP: ffffc90000dd7bb0 R08: dffffc0000000000 R09: fffff520001baf19
R10: fffff520001baf19 R11: 1ffff920001baf18 R12: 0000000000000002
R13: ffffc90000dd7c00 R14: ffff88812559c018 R15: dffffc0000000000
FS:  00007f940c2086c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f940c208d58 CR3: 0000000125406000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 df                	mov    %ebx,%edi
   2:	e8 4e 88 02 00       	call   0x28855
   7:	49 63 de             	movslq %r14d,%rbx
   a:	48 81 fb 00 f0 ff ff 	cmp    $0xfffffffffffff000,%rbx
  11:	0f 87 cd f7 ff ff    	ja     0xfffff7e4
  17:	eb 63                	jmp    0x7c
  19:	e8 67 0a b0 ff       	call   0xffb00a85
  1e:	4c 8b 6c 24 10       	mov    0x10(%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 64 0d 00 00    	jne    0xd9b
  37:	44 8b 33             	mov    (%rbx),%r14d
  3a:	be 00 00 70 00       	mov    $0x700000,%esi
  3f:	44                   	rex.R