Messages in this thread |  | | | Date | Thu, 3 Sep 2009 20:58:06 +0200 | | From | Ingo Molnar <> | | Subject | Re: [boot crash] Re: [tip:timers/core] clocksource: Resolve cpu hotplug dead lock with TSC unstable |
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* Ingo Molnar <mingo@elte.hu> wrote:
> i tried to bisect it but it's inconclusive: > > # bad: [32beef9c] Merge branch 'perfcounters/core' > # bad: [b6413360] manual merge of x86/platform > # bad: [d9e5f39a] Merge branch 'auto-oprofile-next' into auto-latest > # bad: [cbaff272] Merge branch 'auto-timers-next' into auto-latest > > as the bisection comes up with that merge commit. Perhaps the > combination of the x86/platform changes and the clocksource > changes triggered it?
That seems to be the case - i just tested a combination merge of tip:auto-timers-next and tip:auto-x86-next and the result crashed in a similar way too.
Since normal bisection cannot find such breakages, i did a topical bisection (merging the finegrained tip:x86/* topics into the timer tree gradually and testing each merge). That way i could exclude: x86/platform, x86/pat, x86/asm, x86/apic, x86/percpu, x86/cpu, x86/mm and arrived to x86/tsc - which contains a single commit:
d3b8f88: x86: Make tsc=reliable override boot time stability checks
Reverting that commit from tip:master gives me a non-crashing bootup.
Ingo
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