RBP: 000000000072bea0 R08: 0000000020000700 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004c0201 R14: 00000000004cfe50 R15: 000000000000001e
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: 25232 Comm: syz-executor3 Not tainted 4.18.0-rc4+ #147
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 
RSP: 0018:ffff88019508f438 EFLAGS: 00010007
RAX: ffffea0000000000 RBX: 3733313035393234 RCX: 0000000000000000
RDX: 00dcb8a4c0d4e4c0 RSI: 0000000000000000 RDI: 3733313035393234
RBP: ffff88019508f458 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6
R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286
R13: ffffffff81f49660 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f2da9cf1700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000047a9b0 CR3: 00000001b2e45000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fscache_free_cookie+0x230/0x280 fs/fscache/cookie.c:67
 fscache_alloc_cookie+0x74c/0x880 fs/fscache/cookie.c:202
 __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303
 fscache_acquire_cookie include/linux/fscache.h:338 [inline]
 v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73
 v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464
 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135
 mount_fs+0xae/0x328 fs/super.c:1277
 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0x581/0x30e0 fs/namespace.c:2848
 ksys_mount+0x12d/0x140 fs/namespace.c:3064
 __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
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455ab9
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f2da9cf0c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2da9cf16d4 RCX: 0000000000455ab9
RDX: 00000000200002c0 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000020000700 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004c0201 R14: 00000000004cfe50 R15: 000000000000001e
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace a462b5f0fee3843d ]---
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: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 
RSP: 0018:ffff88019508f438 EFLAGS: 00010007
RAX: ffffea0000000000 RBX: 3733313035393234 RCX: 0000000000000000
RDX: 00dcb8a4c0d4e4c0 RSI: 0000000000000000 RDI: 3733313035393234
RBP: ffff88019508f458 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6
R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286
R13: ffffffff81f49660 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f2da9cf1700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000047a9b0 CR3: 00000001b2e45000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400