RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18da24d6d4
R13: 00000000004c7262 R14: 00000000004dd298 R15: 0000000000000006
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: 29516 Comm: syz-executor.5 Not tainted 4.14.156-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809b140180 task.stack: ffff8880571b8000
RIP: 0010:cgroup_root_from_kf kernel/cgroup/cgroup.c:1178 [inline]
RIP: 0010:cgroup_kill_sb+0x2e/0x330 kernel/cgroup/cgroup.c:2035
RSP: 0018:ffff8880571bfac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000fffffff4 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81ac118c RDI: ffff8880909e2e30
RBP: ffff8880571bfae0 R08: ffff88809b140180 R09: ffff88809b140a20
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880909e2e00
R13: ffffffff87da5a00 R14: ffff8880909e2e00 R15: dffffc0000000000
FS:  00007f18da24d700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000081086000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 deactivate_locked_super+0x74/0xe0 fs/super.c:319
 sget_userns+0x9d9/0xc30 fs/super.c:537
 kernfs_mount_ns+0xe9/0x790 fs/kernfs/mount.c:324
 kernfs_mount include/linux/kernfs.h:543 [inline]
 cgroup_do_mount+0x9e/0x270 kernel/cgroup/cgroup.c:1952
 cgroup_mount+0x26d/0x8c0 kernel/cgroup/cgroup.c:2019
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a679
RSP: 002b:00007f18da24cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f18da24cc90 RCX: 000000000045a679
RDX: 0000000020000240 RSI: 0000000020000180 RDI: 0000000000000000
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18da24d6d4
R13: 00000000004c7262 R14: 00000000004dd298 R15: 0000000000000006
Code: e5 41 55 41 54 49 89 fc 53 48 83 ec 08 e8 5b 28 06 00 4c 89 e7 e8 23 12 55 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 c4 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: ffff8880571bfac0
RIP: cgroup_kill_sb+0x2e/0x330 kernel/cgroup/cgroup.c:2035 RSP: ffff8880571bfac0
---[ end trace 26fddd116eb791ca ]---