Messages in this thread | | | Date | Tue, 12 Jun 2007 09:44:13 +0300 | From | Avi Kivity <> | Subject | Re: [kvm-devel] [BUG] Oops with KVM-27 |
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Luca wrote: > On 6/11/07, Avi Kivity <avi@qumranet.com> wrote: >> Luca wrote: >> >> >> >> I've managed to reproduce this on kvm-21 (it takes many boots for >> this >> >> to happen, but it does eventually). >> > >> > Hum, any clue on the cause? >> >> From what I've seen, it's the new Linux clocksource code. > > Actually I tried forcing the PIT (and any other combination of > tsc,acpi_pm,jiffies) as the clocksource, without success. >
Well, there's lots of APIC stuff going on when it hangs.
>> > Should I test older versions? >> >> They're unlikely to be better. Instead, it would be best to see what >> the guest is doing. >> >> I suggest downloading the source rpm for the kernel, building it, and >> sprinkling printk()s until we know exactly what source the guest is >> executing at the time of the hang. > > Ok, will do. Meanwhile I discovered that the kernel on the boot cd > (the one that hangs) is compiled for i586, while the one installed on > disk is for i686 (this one works).
Ah.
> > i686 has this options enabled: > > +CONFIG_X86_GOOD_APIC=y > +CONFIG_X86_USE_PPRO_CHECKSUM=y > +CONFIG_X86_TSC=y > > but disabling tsc on the command line doesn't make any difference. Is > it possible that KVM is choking on some instruction not used by the > i686 kernel?
Unlikely, as then the hang would occur all the time instead of randomly.
-- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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