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Date: Thu, 10 Aug 2006 16:26:18 -0400 (EDT)
From: Daniel Eischen <deischen@freebsd.org>
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To: Simon Marlow <simonmar@microsoft.com>
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Cc: glasgow-haskell-users@haskell.org, haskell@freebsd.org,
	Volker Stolz <vs@foldr.org>, Simon Peyton-Jones <simonpj@microsoft.com>,
	Tony Finch <dot@dotat.at>, Robert Watson <rwatson@freebsd.org>,
	threads@freebsd.org
Subject: RE: GHC 6.4.3 on FreeBSD (fwd)
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On Thu, 10 Aug 2006, Simon Marlow wrote:

> Dear threads@freebsd.org (and others),
>
> This is relating to the problems we're experiencing with GHC's threaded
> runtime on FreeBSD (see context below).
>
> GHC itself, which is a Haskell program, when compiled with itself and
> linked against GHC's threaded runtime, sometimes hangs eating 100% CPU.
> This happens when it is linked with -pthreads, I haven't seen it when
> linking with -lthr.
>
> If I attach using gdb to a hung process, I see this:
>
> (gdb) where
> #0  0x2897146b in pthread_testcancel () from /usr/lib/libpthread.so.2
> #1  0x28972499 in __error () from /usr/lib/libpthread.so.2
> #2  0x2895e6ba in sigaction () from /usr/lib/libpthread.so.2
> #3  0x087ea6b4 in runProcess (args=0x29091758, workingDirectory=0x0,
> environment=0x0,
>    fdStdInput=0, fdStdOutput=1, fdStdError=2, set_inthandler=1,
> inthandler=0,
>    set_quithandler=1, quithandler=0) at runProcess.c:61
> #4  0x0879b3d0 in s3ja_info ()

That trace isn't possible.  I've found that you can't trust
these traces unless you compile libpthread with "-g".

-- 
DE