[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH] sched: fix scheduler_disable() with core scheduling
(CC Igor) On 09/04/2020 13:50, Jürgen Groß wrote: > On 09.04.20 11:41, Sergey Dyasli wrote: >> In core-scheduling mode, Xen might crash when entering ACPI S5 state. >> This happens in sched_slave() during is_idle_unit(next) check because >> next->vcpu_list is stale and points to an already freed memory. >> >> This situation happens shortly after scheduler_disable() is called if >> some CPU is still inside sched_slave() softirq. Current logic simply >> returns prev->next_task from sched_wait_rendezvous_in() which causes >> the described crash because next_task->vcpu_list has become invalid. >> >> Fix the crash by returning NULL from sched_wait_rendezvous_in() in >> the case when scheduler_disable() has been called. >> >> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx> > > Good catch! > > Have you seen any further problems (e.g. with cpu on/offlining) with > this patch applied? This patch shouldn't affect cpu on/offlining AFAICS. Igor was the one testing cpu on/offlining and I think he came to a conclusion that it's broken even without core-scheduling enabled. > Reviewed-by: Juergen Gross <jgross@xxxxxxxx> Thanks! -- Sergey
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |