kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 11654 Comm: syz-executor.3 Not tainted 4.14.174-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888054420140 task.stack: ffff88803bfa8000
RIP: 0010:cgroup_root_from_kf kernel/cgroup/cgroup.c:1178 [inline]
RIP: 0010:cgroup_kill_sb+0x29/0x320 kernel/cgroup/cgroup.c:2035
RSP: 0018:ffff88803bfafb08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000fffffff4 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81a6d938 RDI: ffff8880537389f0
RBP: ffff8880537389c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87da2980
R13: ffff888053738b00 R14: ffffffff87d53540 R15: dffffc0000000000
FS:  00007fb751720700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0db63e9df8 CR3: 0000000082f74000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 sget_userns+0x9df/0xc30 fs/super.c:537
 kernfs_mount_ns+0xe2/0x760 fs/kernfs/mount.c:324
 kernfs_mount include/linux/kernfs.h:544 [inline]
 cgroup_do_mount+0x98/0x250 kernel/cgroup/cgroup.c:1952
 cgroup_mount+0x26b/0x8c0 kernel/cgroup/cgroup.c:2019
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x3c9/0x24f0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3072
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c849
RSP: 002b:00007fb75171fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb7517206d4 RCX: 000000000045c849
RDX: 00000000200002c0 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000749 R14: 00000000004ca11a R15: 0000000000000008
Code: 00 00 41 54 55 48 89 fd 53 48 83 ec 08 e8 d0 fd 05 00 48 89 ef e8 48 8f 52 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 c1 02 00 00 48 8b 18 48 b8 00 00 00 00 00 fc 
RIP: cgroup_root_from_kf kernel/cgroup/cgroup.c:1178 [inline] RSP: ffff88803bfafb08
RIP: cgroup_kill_sb+0x29/0x320 kernel/cgroup/cgroup.c:2035 RSP: ffff88803bfafb08
---[ end trace 01ca9ccfe59e018d ]---