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: 0 PID: 1489 Comm: syz-executor0 Not tainted 4.18.0-rc3-next-20180706+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1781
Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff 
RSP: 0018:ffff8801b83679f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003ec4000
RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090
RBP: ffff8801b8367a00 R08: ffff8801b6bb0400 R09: fffffbfff11c24e5
R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007fbf6f310700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072800c CR3: 00000001b0519000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 kernfs_sop_reconfigure+0xba/0x100 fs/kernfs/mount.c:31
 do_remount_sb+0x34f/0x850 fs/super.c:991
 do_umount fs/namespace.c:1467 [inline]
 ksys_umount+0xfa7/0x12f0 fs/namespace.c:1585
 __do_sys_umount fs/namespace.c:1596 [inline]
 __se_sys_umount fs/namespace.c:1594 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1594
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455ba9
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:00007fbf6f30fc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fbf6f3106d4 RCX: 0000000000455ba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c275a R14: 00000000004d3e48 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace f9be1e4116efa180 ]---
RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1781
Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff 
RSP: 0018:ffff8801b83679f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003ec4000
RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090
RBP: ffff8801b8367a00 R08: ffff8801b6bb0400 R09: fffffbfff11c24e5
R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007fbf6f310700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072800c CR3: 00000001b0519000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600