syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 298 Comm: syz-executor401 Not tainted 5.15.175-syzkaller-00803-g19092c8155b4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:do_unlinkat+0x3e1/0x920 fs/namei.c:4340
Code: de e8 73 05 b2 ff 31 c0 81 fb 00 00 20 00 0f 94 c0 41 be ec ff ff ff 41 29 c6 e9 bd 00 00 00 49 8d 7d 30 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 03 5b f4 ff 49 8b 45 30 48 89 44 24 38 4c
RSP: 0018:ffffc900009b7d60 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffff88810c6f4f00
RDX: ffff88810c6f4f00 RSI: 0000000000000000 RDI: 000000000000003a
RBP: ffffc900009b7ef8 R08: ffffffff81be6a42 R09: ffffed1020084c94
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 000000000000000a R14: dffffc0000000000 R15: 1ffff11020084c8e
FS:  00007fe26895a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe26895ad58 CR3: 00000001013b4000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __do_sys_unlink fs/namei.c:4396 [inline]
 __se_sys_unlink fs/namei.c:4394 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4394
 x64_sys_call+0x289/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe2689b9679
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:00007fe26895a218 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fe268a463f8 RCX: 00007fe2689b9679
RDX: 00007fe2689b9679 RSI: 00000000000f4240 RDI: 0000000020000100
RBP: 00007fe268a463f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe268a13034
R13: 000000000000006e R14: 0030656c69662f30 R15: 2f30656c69662f2e
 </TASK>
Modules linked in:
---[ end trace 9e8d030645b225e0 ]---
RIP: 0010:do_unlinkat+0x3e1/0x920 fs/namei.c:4340
Code: de e8 73 05 b2 ff 31 c0 81 fb 00 00 20 00 0f 94 c0 41 be ec ff ff ff 41 29 c6 e9 bd 00 00 00 49 8d 7d 30 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 03 5b f4 ff 49 8b 45 30 48 89 44 24 38 4c
RSP: 0018:ffffc900009b7d60 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffff88810c6f4f00
RDX: ffff88810c6f4f00 RSI: 0000000000000000 RDI: 000000000000003a
RBP: ffffc900009b7ef8 R08: ffffffff81be6a42 R09: ffffed1020084c94
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 000000000000000a R14: dffffc0000000000 R15: 1ffff11020084c8e
FS:  00007fe26895a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe26895ad58 CR3: 00000001013b4000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	de e8                	fsubrp %st,%st(0)
   2:	73 05                	jae    0x9
   4:	b2 ff                	mov    $0xff,%dl
   6:	31 c0                	xor    %eax,%eax
   8:	81 fb 00 00 20 00    	cmp    $0x200000,%ebx
   e:	0f 94 c0             	sete   %al
  11:	41 be ec ff ff ff    	mov    $0xffffffec,%r14d
  17:	41 29 c6             	sub    %eax,%r14d
  1a:	e9 bd 00 00 00       	jmp    0xdc
  1f:	49 8d 7d 30          	lea    0x30(%r13),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 03 5b f4 ff       	call   0xfff45b39
  36:	49 8b 45 30          	mov    0x30(%r13),%rax
  3a:	48 89 44 24 38       	mov    %rax,0x38(%rsp)
  3f:	4c                   	rex.WR