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Date:      Fri, 6 Dec 2002 15:52:41 +0300 (MSK)
From:      Varshavchick Alexander <alex@metrocom.ru>
To:        David Schultz <dschultz@uclink.Berkeley.EDU>
Cc:        Terry Lambert <tlambert2@mindspring.com>, <freebsd-questions@FreeBSD.ORG>, <freebsd-hackers@FreeBSD.ORG>
Subject:   Re: maxusers and random system freezes
Message-ID:  <Pine.GSO.4.33.0212061546090.15512-100000@apache.metrocom.ru>
In-Reply-To: <20021206123440.GA16544@HAL9000.homeunix.com>

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On Fri, 6 Dec 2002, David Schultz wrote:

> Thus spake Varshavchick Alexander <alex@metrocom.ru>:
> > Well, now I made KVA space 2G, we'll see later on if it helps to get rid
> > of the sudden system halts, but for some reason a side-effect has
> > appeared: pthread_create function returns EAGAIN error now, so I had to
> > recompile the software using it with linux threads to make it working.
> > With the old kernel these pieces worked without problems. Can it be that
> > somehow the enlarged KVA space messed up with the threads mechanism?
>
> I'm not a pthreads expert, but my best guess is that your program
> tried to create a thread with a stack address that was too high.
> Remember that with a 2 GB KVA, user processes have only 2 GB to
> play with instead of 3 GB, so attempting to mmap() a stack above
> about 2 GB would cause pthread_create() to return EAGAIN.
>

Yes this makes sense, however this call to pthread_create didn't specify
any special addresses for the new thread. The pthread_create was called
with the NULL attribute which means that the system defaults were being
used. Something in the system has gone wrong...

----
Alexander Varshavchick, Metrocom Joint Stock Company
Phone: (812)118-3322, 118-3115(fax)






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