Messages in this thread | | | Date | Tue, 12 Jul 2011 14:01:51 -0400 | From | Konrad Rzeszutek Wilk <> | Subject | Re: PROBLEM: 3.0-rc kernels unbootable since -rc3 |
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> > http://darnok.org/xen/loop_cnt.log > > > > which seems to imply that we are indeed stuck in that loop > > forever. > > It does indeed, thank you! Also it looks like interrupts are > disabled, and that timekeeping is similarly out of action.
.. With the latest patch the time looks to be advancing.
> Disabling CONFIG_NO_HZ would be an interesting test case.
Hadn't done that yet. Compiling a kernel with "# CONFIG_NO_HZ is not set" right now. > > > > o Problems due to portions of the code attempting to use > > > RCU read-side critical sections while in dyntick-idle mode. > > > Frederic Weisbecker has located some of these, (though not yet > > > in Xen) and he has some diagnositics which may be found at: > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git > > > > > > on branch eqscheck.2011.07.08a. > > > > > > You need to enable CONFIG_PROVE_RCU for these diagnostics to > > > be executed. > > > > Ok, let me try those too. > > Thank you!
Will shortly do this. > > > > o As always, there might be bugs in RCU. ;-) > > > > > > But the loop in task_waking_fair() looks like the most prominent smoking > > > gun at the moment. > > And could you also please try out the patch that I posted earlier?
With the previous patch and the .. this is getting confusing. With this patch: http://darnok.org/xen/loop_cnt-extra.patch
I get this output: http://darnok.org/xen/log.loop_cnt-extra-patch (one guest with 4 VCPUS) and http://darnok.org/xen/loop_cnt-extra-patch.log (the guest with 16 VCPUs)
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