RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004d2848 R14: 00000000004c289a R15: 0000000000000004
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 26927 Comm: syz-executor5 Not tainted 4.18.0-rc6-next-20180725+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:p9_client_prepare_req.part.8+0x392/0xa00 net/9p/client.c:652
Code: ff 0f 87 6a 02 00 00 e8 6c 8b f4 fa 0f be 85 f4 fe ff ff 4c 89 f2 48 c1 ea 03 89 85 f4 fe ff ff 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 89 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffff8801afc7f298 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90006e24000
RDX: 000000000000000a RSI: ffffffff86881c94 RDI: ffff8801d3428cb8
RBP: ffff8801afc7f3c8 R08: ffff8801b971e3c0 R09: fffffbfff10057c6
R10: fffffbfff10057c6 R11: ffffffff8802be33 R12: ffff8801d3428c80
R13: 0000000000002000 R14: 0000000000000050 R15: 00000000ffffffff
FS:  00007fa07d0c7700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000012839f8 CR3: 00000001ac63a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 p9_client_prepare_req net/9p/client.c:682 [inline]
 p9_client_rpc+0x247/0x1420 net/9p/client.c:682
 p9_client_attach+0x18c/0x800 net/9p/client.c:1052
 v9fs_fid_lookup_with_uid+0x84e/0xbe0 fs/9p/fid.c:157
 v9fs_fid_lookup+0xfb/0x1c0 fs/9p/fid.c:257
 v9fs_xattr_set+0x29/0x50 fs/9p/xattr.c:99
 v9fs_xattr_set_acl+0x441/0x8a0 fs/9p/acl.c:312
 __vfs_removexattr+0x10f/0x170 fs/xattr.c:376
 vfs_removexattr+0xac/0x1c0 fs/xattr.c:395
 removexattr+0xd3/0x130 fs/xattr.c:690
 path_removexattr+0x1b9/0x210 fs/xattr.c:704
 __do_sys_removexattr fs/xattr.c:718 [inline]
 __se_sys_removexattr fs/xattr.c:715 [inline]
 __x64_sys_removexattr+0x59/0x80 fs/xattr.c:715
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x456a09
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa07d0c6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5
RAX: ffffffffffffffda RBX: 00007fa07d0c76d4 RCX: 0000000000456a09
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000020000000
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004d2848 R14: 00000000004c289a R15: 0000000000000004
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 5cc60bd50c07ab24 ]---
RIP: 0010:p9_client_prepare_req.part.8+0x392/0xa00 net/9p/client.c:652
Code: ff 0f 87 6a 02 00 00 e8 6c 8b f4 fa 0f be 85 f4 fe ff ff 4c 89 f2 48 c1 ea 03 89 85 f4 fe ff ff 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 89 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffff8801afc7f298 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90006e24000
RDX: 000000000000000a RSI: ffffffff86881c94 RDI: ffff8801d3428cb8
RBP: ffff8801afc7f3c8 R08: ffff8801b971e3c0 R09: fffffbfff10057c6
R10: fffffbfff10057c6 R11: ffffffff8802be33 R12: ffff8801d3428c80
R13: 0000000000002000 R14: 0000000000000050 R15: 00000000ffffffff
FS:  00007fa07d0c7700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000012839f8 CR3: 00000001ac63a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400