netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
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: 7388 Comm: syz-executor4 Not tainted 4.18.0-rc7-next-20180803+ #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1772
Code: 47 00 eb 8d 90 55 48 89 e5 53 48 89 f3 e8 43 ec 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:ffff880197b579f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003a1a000
RDX: 0000000000000012 RSI: ffffffff8173b03d RDI: 0000000000000090
RBP: ffff880197b57a00 R08: ffff8801ce7a81c0 R09: fffffbfff0fc24e5
R10: fffffbfff0fc24e5 R11: ffffffff87e1272b R12: ffff8801d9e12580
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f60d7acf700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001c6ef2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kernfs_sop_reconfigure+0xba/0x100 fs/kernfs/mount.c:31
 do_remount_sb+0x34f/0x850 fs/super.c:983
 do_umount fs/namespace.c:1464 [inline]
 ksys_umount+0xfbf/0x1310 fs/namespace.c:1582
 __do_sys_umount fs/namespace.c:1593 [inline]
 __se_sys_umount fs/namespace.c:1591 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1591
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x456b29
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:00007f60d7acec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f60d7acf6d4 RCX: 0000000000456b29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d60e0 R14: 00000000004c982c R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 55d3d08d32709cd1 ]---
RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1772
Code: 47 00 eb 8d 90 55 48 89 e5 53 48 89 f3 e8 43 ec 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
netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'.
RSP: 0018:ffff880197b579f8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003a1a000
RDX: 0000000000000012 RSI: ffffffff8173b03d RDI: 0000000000000090
RBP: ffff880197b57a00 R08: ffff8801ce7a81c0 R09: fffffbfff0fc24e5
R10: fffffbfff0fc24e5 R11: ffffffff87e1272b R12: ffff8801d9e12580
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f60d7acf700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001c6ef2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400