kern/72979: unkillable process(es) stuck in `STOP' state
davidxu at freebsd.org
Wed Oct 27 16:20:34 PDT 2004
The following reply was made to PR kern/72979; it has been noted by GNATS.
From: David Xu <davidxu at freebsd.org>
To: Ken Smith <kensmith at cse.Buffalo.EDU>
Cc: Mikhail Teterin <mi+mx at aldan.algebra.com>,
Michael Nottebrock <michaelnottebrock at gmx.net>, re at freebsd.org,
davidxu at t2t2.com, davidxu at viatech.com.cn,
freebsd-gnats-submit at freebsd.org
Subject: Re: kern/72979: unkillable process(es) stuck in `STOP' state
Date: Thu, 28 Oct 2004 07:19:57 +0800
Ken Smith wrote:
>On Tue, Oct 26, 2004 at 12:07:47PM -0400, Mikhail Teterin wrote:
>>=On Tue, Oct 26, 2004 at 07:11:54PM +0800, David Xu wrote:
>>=That looks both promising (given symptoms) and low-risk.
>>=Mikhail et. al., will you have any problems testing that?
>>This problem was not easy to reproduce to begin with :-(
>>I don't even know, how it can be positively claimed gone. Shall we merge
>>David's fix into RELENG_5 and hope for the best?
>Has anyone had time to test David's patch? If yes have you had
>any problems since?
>I should know later today if the other person who had been reporting
>problems has had them stop. He reported last night he was still able
>to reproduce the problem but he hasn't had any "luck" doing it today.
>David, my only real question I guess is whether perhaps P_STOPPED_SINGLE
>should be added to the flags that are being turned off by your patch.
>If I'm following the code right what had made P_STOPPED_TRACE special
>was it's one of the three signals lumped into P_STOPPED and the code
>in do_tdsignal() looks for that, as well as I'm sure the schedulers...
P_STOPPED_SINGLE needn't be removed here, in fact, the flag should
turned off at this point, if the flag is still there, then there must be a
bug, thread_single(SINGLE_EXIT) should turn it off if it returns or thread
will exit in the function.
P_STOPPED_TRACE is cleared by debugger via PT_DETACH in sys_process.c, but
if debugger dies without chance to call ptrace(PT_DETACH), then exit1() must
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