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    SubjectRe: 2.4.17 agpgart process hang on crash
    On Sat, 2 Feb 2002, Andrew Morton wrote:

    > Lars Christensen wrote:
    > >
    > > Hi. I have experienced a problem with the combination of kernel-2.4.16,
    > > the kernel agpgart module and NVIDIA supplied drivers. I don't know which
    > > is the cause of the problem.
    > >
    > > Symptoms: Whenever an OpenGL application crashes (segfault etc.), the
    > > process hangs and can't be killed. Responds to no signals (not even 9). ps
    > > -ef hangs, it seems, when the crashed process is to be listed (some other
    > > processes are listed first).
    > >
    > > Hardware: AMD Athlon 1.333HGZ, ASUS M266 motherboard (AMD761 AGP
    > > chipset), NVIDIA GeForce2 MX400 gfx card.
    > >
    > > The mem=nopentium option have no effect on the problem, but it doesn't
    > > occur if I use the NVIDIA AGP drivers or kernel 2.4.16 agp drivers. I am
    > > not able to test the 2.4.17 agpgart with other 3D hardware that nvidia.
    > >
    >
    > This is possibly because the crashing application tries to dump
    > core, and the kernel gets a fault accessing the video card's
    > mapping, and deadlocks over the recursive attempt to take mmap_sem.
    >
    > Please apply this patch:
    >
    > http://www.zip.com.au/~akpm/linux/2.4/2.4.18-pre7/fbmem-mmap.patch
    >
    > and send a report back.

    No luck. Still hangs (e.g. with ./testgart & pkill -ABRT testgart), with
    and without that patch and with and without 2.4.18-pre7. Does seem to
    happen when dumping core--it doesn't happen with core dumping disabled.

    --
    Lars Christensen, larsch@cs.auc.dk

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