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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: rsync over ssh hang issue understood
Date: Tue, 2 May 2006 13:12:30 +0100
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On 01 May 2006 15:58, Brian Ford wrote:

> On Thu, 27 Apr 2006, Dave Korn wrote:
> 
>> On 26 April 2006 20:34, Steven Hartland wrote:
>> 
>>> Interestingly if I try to get a thread dump using
>>> sysinternals process explorer the rsync process goes
>>> mad using all available cpu.
>> 
>>   That's a known issue, and one which I'd like to try and work on, but
>> it's really complex.  It's a side-effect of procexp doing an
>> RtlQueryProcessDebugInformation call on the cygwin process, which works
>> internally by injecting a remote thread into the cygwin process; this
>> new thread interacts badly with dll csrss in some way because it isn't
>> "lpc-registered".
> 
> FWIW, I believe this behavior started about the time thread local storage
> at the base of the stack was implimented via thread creation interception
> by the cygwin1.dll.
> 
> Just a WAG, but you might consider disabling that in some way to test.
> You might also consider disabling the code to force double stack alignment
> in same.  Just in case you're open for leads that I don't have time to
> investigate ;-).

  Thanks, that's just the sort of hint I was looking for.  Will report back as
and when (if!) I figure it out.


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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