Re: [Xen-devel] [PATCH v2 00/48] xen: add core scheduling support

[Juergen Gross <jgross@xxxxxxxx>]

Hi Sergey,

On 15.08.19 12:17, Sergey Dyasli wrote:
> Hi Juergen,
>
> The latest round of testing revealed the following 3 Xen crashes:
>
> 1. vcpu_sleep_sync() <-- vlapic_init_sipi_action()
> This was seen multiple times. It tends to happen on large Windows Server
> VMs (>= 12 vCPUs).
> https://paste.debian.net/1095844/
>
> 2. vcpu_sleep_sync() <-- vcpu_set_periodic_timer() <-- pv_hypercall()
> This was seen on Sles 11.4 PV VM with 32 vCPUs and 6GB RAM
> https://paste.debian.net/1095843/
>
> 3. ACPI S5: schedule.c#sched_slave()
> This one was during shutdown again.
> https://paste.debian.net/1095845/
>
> There also were a number of Dom0 soft-lockups (together with RCU stalls)
> but unfortunately our crashdump tool was a bit broken so full Dom0 kernel
> logs were not captured this time.
>
> And CentOS 5.11 suspend regression (as reported previously) is still
> present.
I have found one bug in the v->is_running setting, which might be
related to your observed hangs, but I couldn't verify that.

I have rebased my series with the is_running fix to current staging. You
can find that under

git://github.com/jgross1/xen/ sched-v2b-2019-09-05

This branch includes the needed prerequisite series ("xen/sched: use new 
idle scheduler for free cpus"), and some additional debug enhancements
I'd like you to use:

- my series for debugtrace enhancements
- my series for lock-profiling enhancements
- and as the last patch some debugtrace hooks in the scheduler

Please make sure to have CONFIG_DEBUG_TRACE and
CONFIG_DEBUG_LOCK_PROFILE set when building the hypervisor.

When testing please add:

async-show-all=on watchdog=on debugtrace=cpu:16

to the hypervisor boot parameters. This should add a lot of additional
output in case of a crash, which will (hopefully) help to find the
reason(s) for hangs and crashes.


Juergen

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