Re: 2.6.14 X spinning in the kernel

From: Max Krasnyansky
Date: Wed Nov 16 2005 - 16:08:04 EST

Badari Pulavarty wrote:
Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:

On Mon, 2005-11-14 at 16:17 -0800, Andrew Morton wrote:

Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:

My 2-cpu EM64T machine started showing this problem again on 2.6.14.
On some reboots, X seems to spin in the kernel forever.

sysrq-t output shows nothing.

X R running task 0 3607 3589 3903

top shows:
3607 root 25 0 0 0 0 R 99.1 0.0 262:04.69 X

So, I wrote a module to do smp_call_function() on all CPUs
to show stacks on them. CPU0 seems to be spinning in exit_mmap().
I did this multiple times to collect stacks few times.

Is this a known issue ?

I've seen similar problems on dual Opteron HP xw9300/Radeon 7000 PCI box with
and latest X from Fedora x86-64 YUM repos.
I haven't done any traces but it sounds like the same problem (ie X server is spinning).
Disabling DRI in xorg.conf fixed it for me.

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