Messages in this thread | | | Subject | Re: [-mm patch] enforce noreplace-smp in alternative_instructions() | From | Rusty Russell <> | Date | Sat, 25 Aug 2007 22:07:29 +1000 |
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On Fri, 2007-08-24 at 10:22 +0200, Frederik Deweerdt wrote: > [Added Gerd Hoffman and Rusty Russel to cc] > On Thu, Aug 23, 2007 at 11:46:52PM -0700, Jeremy Fitzhardinge wrote: > > Frederik Deweerdt wrote: > > > That means that even when you specify noreplace_smp, some replacing > > > takes place anyway. One of the consequences, besides noreplace_smp not > > > working as expected, is that lguest crashes when you feed it an SMP kernel > > > (I suspect that you can not replace alternatives for smp _and_ paravirt). > > > > > > > No, that should be fine. Why does lguest crash? > It dies with: > [ 0.131000] SMP alternatives: switching to UP code > lguest: bad stack page 0xc057a000
How odd! This means that the guest set the kernel to a stack which it hadn't mapped writable (or perhaps not mapped at all). I always run SMP kernels, and that seems a very strange side effect of a patching problem...
Nonetheless, I did have a previous problem with a bug in the patching code which didn't show up native and did show up under lguest.
Can you send your config? Do you need noreplace-smp even on 2.6.23-rc3, or only 2.6.23-rc3-mm1?
Thanks, Rusty.
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