Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic

[Christian Borntraeger]

Am 26.09.22 um 10:06 schrieb Christian Borntraeger:
> Am 23.09.22 um 09:53 schrieb Christian Borntraeger:
> > Am 23.09.22 um 09:21 schrieb Christian Borntraeger:
> > > Peter,
> > >
> > > as a heads-up. This commit (bisected and verified) triggers a
> > > regression in our KVM on s390x CI. The symptom is that a specific
> > > testcase (start a guest with next kernel and a poky ramdisk,
> > > then ssh via vsock into the guest and run the reboot command) now
> > > takes much longer (300 instead of 20 seconds). From a first look
> > > it seems that the sshd takes very long to end during shutdown
> > > but I have not looked into that yet.
> > > Any quick idea?
> > >
> > > Christian
> >
> > the sshd seems to hang in virtio-serial (not vsock).
>
> FWIW, sshd does not seem to hang, instead it seems to busy loop in
> wait_port_writable calling into the scheduler over and over again.

-#define TASK_FREEZABLE                 0x00002000
+#define TASK_FREEZABLE                 0x00000000

"Fixes" the issue. Just have to find out which of users is responsible.