Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 3 UID: 0 PID: 6532 Comm: syz.0.16 Not tainted 6.14.0-syzkaller-g1e26c5e28ca5 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:p9_client_walk+0x99/0x530 net/9p/client.c:1165
Code: 65 84 8c 08 48 89 84 24 88 00 00 00 31 c0 e8 7e d6 aa f6 48 89 d8 31 c9 48 c1 e8 03 66 89 4c 24 40 48 c7 44 24 50 00 00 00 00 <42> 80 3c 30 00 0f 85 43 04 00 00 31 ff 89 ee 4c 8b 33 e8 80 d1 aa
RSP: 0018:ffffc90003cffaa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888020f42440 RSI: ffffffff8b103bb2 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000007 R09: fffffffffffff000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200079ff56
FS:  00007f86c15776c0(0000) GS:ffff8880d6d54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86c1576f98 CR3: 0000000032db0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 clone_fid fs/9p/fid.h:23 [inline]
 v9fs_fid_xattr_set+0x118/0x2d0 fs/9p/xattr.c:121
 v9fs_set_acl+0xe6/0x150 fs/9p/acl.c:276
 v9fs_set_create_acl+0x4b/0x70 fs/9p/acl.c:306
 v9fs_vfs_mkdir_dotl+0x531/0x6e0 fs/9p/vfs_inode_dotl.c:411
 vfs_mkdir+0x590/0x8c0 fs/namei.c:4324
 do_mkdirat+0x304/0x3e0 fs/namei.c:4357
 __do_sys_mkdir fs/namei.c:4379 [inline]
 __se_sys_mkdir fs/namei.c:4377 [inline]
 __x64_sys_mkdir+0xef/0x140 fs/namei.c:4377
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86c078d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86c1577038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f86c09a5fa0 RCX: 00007f86c078d169
RDX: 0000000000000000 RSI: 0000000000000040 RDI: 00004000000000c0
RBP: 00007f86c080e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f86c09a5fa0 R15: 00007ffcb9501078
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:p9_client_walk+0x99/0x530 net/9p/client.c:1165
Code: 65 84 8c 08 48 89 84 24 88 00 00 00 31 c0 e8 7e d6 aa f6 48 89 d8 31 c9 48 c1 e8 03 66 89 4c 24 40 48 c7 44 24 50 00 00 00 00 <42> 80 3c 30 00 0f 85 43 04 00 00 31 ff 89 ee 4c 8b 33 e8 80 d1 aa
RSP: 0018:ffffc90003cffaa0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888020f42440 RSI: ffffffff8b103bb2 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000007 R09: fffffffffffff000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200079ff56
FS:  00007f86c15776c0(0000) GS:ffff8880d6d54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86c1576f98 CR3: 0000000032db0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	65 84 8c 08 48 89 84 	test   %cl,%gs:0x24848948(%rax,%rcx,1)
   7:	24
   8:	88 00                	mov    %al,(%rax)
   a:	00 00                	add    %al,(%rax)
   c:	31 c0                	xor    %eax,%eax
   e:	e8 7e d6 aa f6       	call   0xf6aad691
  13:	48 89 d8             	mov    %rbx,%rax
  16:	31 c9                	xor    %ecx,%ecx
  18:	48 c1 e8 03          	shr    $0x3,%rax
  1c:	66 89 4c 24 40       	mov    %cx,0x40(%rsp)
  21:	48 c7 44 24 50 00 00 	movq   $0x0,0x50(%rsp)
  28:	00 00
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	0f 85 43 04 00 00    	jne    0x478
  35:	31 ff                	xor    %edi,%edi
  37:	89 ee                	mov    %ebp,%esi
  39:	4c 8b 33             	mov    (%rbx),%r14
  3c:	e8                   	.byte 0xe8
  3d:	80 d1 aa             	adc    $0xaa,%cl