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From: Andrew DeFaria <Andrew AT DeFaria DOT com>
Subject: Re: Cygwin processes getting stuck on max CPU usage; XP SP2 problem?
Date: Thu, 23 Sep 2004 15:07:11 -0700
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Simon Barnes wrote:

> Some of my colleagues and I are seeing this without using Process 
> Explorer. No doubt some other automated process is triggering it, but 
> we don't know which.
>
> Is there anything I can do to help work towards a fix? It's moderately 
> inconvenient having to restart rxvt or bash every few hours.
>
> Simon
>
>> If you have symbols installed and you list the threads for the hung 
>> Cygwin process you'll see the stuck one is in a loop in 
>> ntdll.dll!RtlConvertUiListToApiList, as well as a corresponding 
>> thread in csrss.exe (CSRSRV.dll!ValidateMessageString) for each. The 
>> CPU usage seems to be split equally between them all.
>>
>> So, it's definitely an interaction between Cygwin and Process 
>> Explorer's grubby little fingers... however no one seems to be 
>> interestd in fixing it so for the time being the solution seems to be 
>> "Don't accidently enable the 'DLLs View' of a cygwin process in ProcExp."
>
Ah ha! I thought only I was seeing this oddity! What I would see is 
csrss consuming CPU wildly along with cron and inetd. My usually 
workaround would be to net stop/start cron and inetd and things were 
fine again. Then I'd scratch my head and wonder how that happened. I 
thought of reporting it but it seemed elusive and sporadic. Hmmm... I 
usually use procexp at work but not as much at home. My problem happens 
at home but not as much at work. The procexp I have at work is newer 
than the one at home (just adding data points).

Next time this happens I'll try to remember to note if procexp is 
running. I wonder if killing procexp also fixes the problem.

Strange!
-- 
Hidden DOS secret: add BUGS=OFF to your CONFIG.SYS


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