syzbot

INFO: task kvm-nx-lpage-re:7916 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc4-syzkaller-00051-g48b1320a674e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kvm-nx-lpage-re state:D stack:29944 pid:7916  ppid:2      flags:0x00024000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6669
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 cgroup_lock include/linux/cgroup.h:370 [inline]
 cgroup_attach_task_all+0x25/0x140 kernel/cgroup/cgroup-v1.c:61
 kvm_vm_worker_thread+0x306/0x660 arch/x86/kvm/../../../virt/kvm/kvm_main.c:6157