Re: [Xen-devel] POD: soft lockups in dom0 kernel

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.12.13 at 14:55, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> wrote:
> when creating a bigger (> 50 GB) HVM guest with maxmem > memory we get
> softlockups from time to time.
> 
> kernel: [  802.084335] BUG: soft lockup - CPU#1 stuck for 22s! [xend:31351]
> 
> I tracked this down to the call of xc_domain_set_pod_target() and further
> p2m_pod_set_mem_target().
> 
> Unfortunately I can this check only with xen-4.2.2 as I don't have a machine
> with enough memory for current hypervisors. But it seems the code is nearly
> the same.

While I still didn't see a formal report of this against SLE11 yet,
attached a draft patch against the SP3 code base adding manual
preemption to the hypercall path of privcmd. This is only lightly
tested, and therefore has a little bit of debugging code still left in
there. Mind giving this an try (perhaps together with the patch
David had sent for the other issue - there may still be a need for
further preemption points in the IOCTL_PRIVCMD_MMAP*
handling, but without knowing for sure whether that matters to
you I didn't want to add this right away)?

Jan

Attachment: xen-privcmd-hcall-preemption.patch
Description: Text document

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