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SubjectRe: 2.4.10/Preemt STOP bug
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On Tue, 2001-10-02 at 20:58, Justin A wrote:
> It seems there is a bug in 2.4.10 or the preemptable patch that causes the STOP
> signal to not work right 19 times out of 20 or so.
>
> This is most easily seen by running 'seq 1 100000' in a terminal and pressing
> control Z or using kill -STOP the proccess stops, but the parent process never
> comes back, kill -CONT has to be used in order to get the proccess back.
>
> CPU usage my be a factor in this, yes(1) backgrounds correctly more often then
> seq does.
>
> There are no problems with fg/CONT.

The problem is with the preemptible kernel patch...

You need to be using a recent patch, this bug was fixed awhile back in
an explicit patch (patch-rml-2.4.xx-preempt-ptrace-signal-fix-1).

It was merged into the 2.4.10 patch with revision 5, and it is in all
newer patches.

You can get patches for 2.4.10, 2.4.11-pre2, and 2.4.10-ac3 (soon -ac4)
at http://tech9.net/rml/linux

They all fix this problem.

--
Robert M. Love
rml at ufl.edu
rml at tech9.net

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