Hello,
While testing pv-shim from a snapshot of staging 4.13 branch (with core-
scheduling patches applied), some sort of scheduling issues were uncovered
which usually leads to a guest lockup (sometimes with soft lockup messages
from Linux kernel).
This happens more frequently on SandyBridge CPUs. After enabling
CONFIG_DEBUG in pv-shim, the following assertions failed:
Null scheduler:
Assertion 'lock == get_sched_res(i->res->master_cpu)->schedule_lock' failed
at ...are/xen-dir/xen-root/xen/include/xen/sched-if.h:278
(full crash log: https://paste.debian.net/1108861/ )
Credit1 scheduler:
Assertion 'cpumask_cycle(cpu, unit->cpu_hard_affinity) == cpu' failed at
sched_credit.c:383
(full crash log: https://paste.debian.net/1108862/ )
I'm currently investigation those, but would appreciate any help or
suggestions.
Thanks,
Sergey
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