2.4.x SMP blamed for Xfree 4.0 crashes

From: Tony Gale (gale@syntax.dera.gov.uk)
Date: Tue Feb 13 2001 - 08:05:05 EST

Having experienced a number of crashes with Xfree 4.0 with 2.4
kernels, that I wasn't getting with 2.2 kernels, a quick search on
the xfree Xpert mailing list reveals this:


Mark Vojkovich mvojkovich@valinux.com
Wed, 10 Jan 2001 10:49:05 -0800 (PST)

On Wed, 10 Jan 2001, Martin Schenk wrote:
> I'm using the nv.o driver
of XFree-4.0.1 with a TNT card
> on a SMP system under the new linux kernel 2.4.0.
>> Occasionally XFree segfaults and dumps me back to the command
> line.
> I assume the problem has to do with my using the new kernel,
> which provides finer grained kernel locks.
>> I attach the startup info from XFree.log and a backtrace done
> on the coredump (if someone is interested in the coredump,
> it is about 2MB bzip2'd).

   This is a long-standing problem with 2.3 and 2.4 SMP
kernels. I believe it is a kernel bug and isn't the XFree86
project's problem. The problem does not exist on 2.2
SMP kernels nor on 2.3/4 UP kernels. The symptoms are
random segfaults in perfectly fine XFree86 code.

Anyone looking into this?


E-Mail: Tony Gale <gale@syntax.dera.gov.uk>
If a nation expects to be ignorant and free,
... it expects what never was and never will be.
		-- Thomas Jefferson

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