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SubjectRe: 2.6.8.1-mm4 - more cpu hotplug breakage
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On Mon, 2004-08-23 at 17:18, Nathan Lynch wrote:
> Hi-
>
> In both 2.6.8.1-mm3 and -mm4, a task which tries to offline a cpu
> becomes permanently hung, seemingly because the high-priority per-cpu
> kernel threads which __stop_machine_run starts never get to run. I did
> a bisection search on the 2.6.8.1-mm4 patch series and narrowed it down
> to one of these three patches, listed below along with their behavior
> when trying to offline a cpu:
>
> 191: sched-smt-fixes.patch - panic
> 192: sched-smt-fixes-fix.patch - panic
> 193: nicksched.patch - process hangs

My apologies if this is getting annoying, but it occurred to me that any
user of stop_machine_run is broken similarly... which means that
unloading a module will also hang your machine. I have verified this on
2.6.8.1-mm4 on ppc64.

Nathan


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