----- 23 paź, 2020 o 6:47, Jürgen Groß [email protected] napisał(a): > On 23.10.20 00:59, Michał Leszczyński wrote: >> Hello, >> >> when using DRAKVUF against a Windows 7 x64 DomU, the whole machine hangs >> after a >> few minutes. >> >> The chance for a hang seems to be correlated with number of PCPUs, in this >> case >> we have 14 PCPUs and hang is very easily reproducible, while on other >> machines >> with 2-4 PCPUs it's very rare (but still occurring sometimes). The issue is >> observed with the default sched=credit2 and is no longer reproducible once >> sched=credit is set. > > Interesting. Can you please share some more information? > > Which Xen version are you using?
RELEASE-4.14 > > Is there any additional information in the dom0 log which could be > related to the hang (earlier WARN() splats, Oopses, Xen related > messages, hardware failure messages, ...? I will try to find something out next week and will come back to you. > > Can you please try to get backtraces of all cpus at the time of the > hang? > > It would help to know which cpu was the target of the call of > smp_call_function_single(), so a disassembly of that function would > be needed to find that information from the dumped registers. > > I'm asking because I've seen a similar problem recently and I was > rather suspecting a fifo event channel issue than the Xen scheduler, > but your data suggests it could be the scheduler after all (if it is > the same issue, of course). > > > Juergen
