Date: Mon, 17 Apr 2000 21:17:43 +0200 From: Dave Boers <djb@relativity.student.utwente.nl> To: FreeBSD-smp@FreeBSD.org Cc: Tommy Hallgren <thallgren@yahoo.com>, Jeremiah Gowdy <jgowdy@home.com>, bart@ixori.demon.nl, Matthew Dillon <dillon@apollo.backplane.com> Subject: Re: SMP and vn Message-ID: <20000417211743.A589@relativity.student.utwente.nl> In-Reply-To: <20000403115124.A374@relativity.student.utwente.nl>; from djb@relativity.student.utwente.nl on Mon, Apr 03, 2000 at 11:51:24AM %2B0200 References: <20000327183911.18682.qmail@web124.yahoomail.com> <20000329132919.A10781@relativity.student.utwente.nl> <200003291604.IAA63016@apollo.backplane.com> <20000329203525.A379@relativity.student.utwente.nl> <20000403115124.A374@relativity.student.utwente.nl>
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On Mon, Apr 03, 2000 at 11:51:24AM +0200, Dave Boers wrote:
> [Ongoing story about 4.0 hangs on SMP systems]
I finally found what triggers the hangs we have been talking about. On my
system they are triggered by licq and cdrecord. The one thing those
applications have in common is that they use Posix scheduling. I have used
licq remote and I did not use cdrecord or other applications that use Posix
scheduling for the past 15 days and my uptime is also 15 days. That's the
longest uptime since a long time for this system!
I suspect that the people who have suspected XFree86 of crashing their
system had it compiled with support for pthreads...
Anyway, as far as I am concerned, the answer is there now: posix scheduling
has bugs on smp systems; those bugs were likely introduced in 4.0-current
somewhere in december 1999 or january 2000.
If anyone wants to look into the problem, I can help testing. From what I
know, it looks like the kernel is looping (because there is no panic).
Regards,
Dave.
--
djb@ifa.au.dk d.j.boers@tn.utwente.nl
PGP key: ftp://relativity.student.utwente.nl:/pub/pgpkeys/djb.asc
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