Date: Tue, 07 Oct 2003 00:57:45 +0100 From: Jay Cornwall <jay@evilrealms.net> To: Joe Marcus Clarke <marcus@marcuscom.com> Cc: FreeBSD GNOME Users <gnome@freebsd.org> Subject: Re: FreeBSD Current lang/mono runtime problems Message-ID: <3F820179.80100@evilrealms.net> In-Reply-To: <1065477237.748.95.camel@gyros> References: <3F81E292.8070308@evilrealms.net> <1065477237.748.95.camel@gyros>
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Joe Marcus Clarke wrote: >>[jay@python mono]$ mcs --version >>Mono C# compiler version 0.27.0.0 >> >>And never finishes. I tried to get an strace, but that seems to have >>issues with a missing /proc filesystem. Is there any more useful >>information I can obtain under FreeBSD to help debug this? > Mono doesn't work on FreeBSD. The problem seems to be in the garbage > collector. If you build mono without GC, it should work okay (but never > release memory). Ah, hmm. > Honestly, gnome@ doesn't really want mono since no one here is really a > C# user. We are keeping it since one of our developers, Juli Mallett, > has been busy, but wants to get back into Mono. In the meantime, if you > want to look at improving boehm-gc on FreeBSD, I'm sure your > contributions will not be turned down. Well I've had a brief look tonight, but free time is a little on the short side at the moment. It seems a segfault occurs inside mono-0.28/mono/mini.c:7291, sigusr1_signal_handler(). In order to identify the thread (through mono_current_thread()), mono/metadata/threads.c stores the MonoThread * in a thread-local structure using pthread_setspecific in previously called methods of mono/metadata/threads.c. Dropping in a few debug statements shows that a thread is entering sigusr1_signal_handler() that hasn't previously had its MonoThread * set (it may not even be a MonoThread, for all I know). That's the direct reason for the crash - to find the indirect reason, i.e. why this thread is entering without its MonoThread * set, will take me a bit longer. Enough technobabble, I'll try and find the bug and fix it! -- Cheers, Jay http://www.evilrealms.net/ - Systems Administrator & Developer http://www.ic.ac.uk/ - Imperial College, 2nd year CS student
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