FS-Cache: O-key=[10] '34323934363939343139'
FS-Cache: N-cookie c=(____ptrval____) [p=(____ptrval____) fl=2 nc=0 na=1]
FS-Cache: N-cookie d=(____ptrval____) n=(____ptrval____)
FS-Cache: N-key=[10] '34323934363939343139'
FS-Cache: Duplicate cookie detected
BUG: unable to handle kernel paging request at ffffebe000000008
FS-Cache: O-cookie c=(____ptrval____) [p=(____ptrval____) fl=222 nc=0 na=1]
PGD 0 P4D 0 
Oops: 0000 [#1] SMP KASAN
FS-Cache: O-cookie d=(____ptrval____) n=(____ptrval____)
CPU: 0 PID: 4729 Comm: syz-executor091 Not tainted 4.18.0-rc4+ #147
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FS-Cache: O-key=[10] '
RIP: 0010:virt_to_head_page include/linux/mm.h:638 [inline]
RIP: 0010:virt_to_cache mm/slab.c:399 [inline]
RIP: 0010:kfree+0xa0/0x260 mm/slab.c:3809
Code: 
34
82 cb 01 00 
32
00 48 ba 00 00 
39
00 80 ff 77 00 
34
00 48 01 c2 48 
36
89 df 48 b8 00 
39
00 00 00 00 
39
ea ff ff 48 
34
c1 ea 0c 48 c1 
31
e2 06 48 01 c2 
39
<48> 8b 42 08 
'
a8 01 48 
FS-Cache: N-cookie c=(____ptrval____) [p=(____ptrval____) fl=2 nc=0 na=1]
8d 48 ff 48 0f 
FS-Cache: N-cookie d=(____ptrval____) n=(____ptrval____)
45 d1 4c 8b 6a 
FS-Cache: N-key=[10] '
18 49 63 75 74 
34
RSP: 0018:ffff8801abd37520 EFLAGS: 00010086
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000
32
RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8801abd37540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286
39
R13: ffffffff8766e76a R14: ffff8801abd37690 R15: ffff8801afca2a00
FS:  00007f7f012ae700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
34
CR2: ffffebe000000008 CR3: 00000001d882b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
36
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 p9_client_version net/9p/client.c:1010 [inline]
 p9_client_create+0xfea/0x1770 net/9p/client.c:1070
39
39
34
31
39
'
FS-Cache: Duplicate cookie detected
 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400
FS-Cache: O-cookie c=(____ptrval____) [p=(____ptrval____) fl=222 nc=0 na=1]
FS-Cache: O-cookie d=(____ptrval____) n=(____ptrval____)
FS-Cache: O-key=[10] '
34
 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
 mount_fs+0xae/0x328 fs/super.c:1277
32
 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
39
34
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0x581/0x30e0 fs/namespace.c:2848
36
39
39
34
 ksys_mount+0x12d/0x140 fs/namespace.c:3064
36
 __do_sys_mount fs/namespace.c:3078 [inline]
 __se_sys_mount fs/namespace.c:3075 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
36
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
'
FS-Cache: N-cookie c=(____ptrval____) [p=(____ptrval____) fl=2 nc=0 na=1]
FS-Cache: N-cookie d=(____ptrval____) n=(____ptrval____)
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446a59
FS-Cache: N-key=[10] '
Code: e8 6c 
34
e7 ff ff 48 83 
32
c4 18 c3 0f 
39
1f 80 00 00 00 
34
00 48 89 f8 48 
36
89 f7 48 89 d6 
39
48 89 ca 4d 89 c2 
39
4d 89 c8 4c 8b 4c 
34
24 08 0f 05 <48> 
36
3d 01 f0 ff ff 
36
0f 83 ab 06 fc ff 
'
c3 66 2e 0f 1f 
FS-Cache: Duplicate cookie detected
84 00 00 00 00 
RSP: 002b:00007f7f012adda8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dcc5c RCX: 0000000000446a59
FS-Cache: O-cookie c=(____ptrval____) [p=(____ptrval____) fl=222 nc=0 na=1]
RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000000000000
RBP: 00000000006dcc58 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0031656c69662f2e
FS-Cache: O-cookie d=(____ptrval____) n=(____ptrval____)
R13: 6f6c3d6568636163 R14: 64663d736e617274 R15: 0000000000000001
Modules linked in:
FS-Cache: O-key=[10] '
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffffebe000000008
34
---[ end trace 44b911ed7ea536fb ]---
RIP: 0010:virt_to_head_page include/linux/mm.h:638 [inline]
RIP: 0010:virt_to_cache mm/slab.c:399 [inline]
RIP: 0010:kfree+0xa0/0x260 mm/slab.c:3809
32
Code: 82 cb 01 
39
00 00 48 ba 
34
00 00 00 80 ff 
36
77 00 00 48 01 
39
c2 48 89 df 48 
39
b8 00 00 00 00 
34
00 ea ff ff 48 
36
c1 ea 0c 48 c1 
36
e2 06 48 01 c2 
'
<48> 8b 42 08 a8 
FS-Cache: N-cookie c=(____ptrval____) [p=(____ptrval____) fl=2 nc=0 na=1]
01 48 8d 48 ff 
FS-Cache: N-cookie d=(____ptrval____) n=(____ptrval____)
48 0f 45 d1 4c 
FS-Cache: N-key=[10] '
8b 6a 18 49 63 
34
75 74 
RSP: 0018:ffff8801abd37520 EFLAGS: 00010086
32
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8801abd37540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6
39
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286
R13: ffffffff8766e76a R14: ffff8801abd37690 R15: ffff8801afca2a00
FS:  00007f7f012ae700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
34
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebe000000008 CR3: 00000001d882b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
36
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400