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Running on an x86_64 box, with a 2.6.28 kernel, lcrash fails
on a failed read of /dev/mem.
It is a read to initialize virtop. It fails with EPERM.
The problem is
CONFIG_STRICT_DEVMEM=y
(could this be a problem to crash as well?)
-Cliff
* Cliff Wickman [2008-11-12 09:54]:
Running on an x86_64 box, with a 2.6.28 kernel, lcrash fails
on a failed read of /dev/mem.
It is a read to initialize virtop. It fails with EPERM.
The problem is
CONFIG_STRICT_DEVMEM=y
(could this be a problem to crash as well?)
Yes. I'm working on making that runtime-configurable and hope that
patch gets accepted upstream.
Regards,
Bernhard
--
Bernhard Walle, SUSE Linux Products GmbH, Architecture Development
----- "Bernhard Walle" <bwalle(a)suse.de> wrote:
* Cliff Wickman [2008-11-12 09:54]:
>
>
> Running on an x86_64 box, with a 2.6.28 kernel, lcrash fails
> on a failed read of /dev/mem.
> It is a read to initialize virtop. It fails with EPERM.
>
> The problem is
> CONFIG_STRICT_DEVMEM=y
>
> (could this be a problem to crash as well?)
Yes. I'm working on making that runtime-configurable and hope that
patch gets accepted upstream.
Regards,
Bernhard
And hopefully Bernhard's efforts will work out for non-Red Hat
users of the crash utility.
The CONFIG_STRICT_DEVMEM concept has been in place in Red Hat
x86 and x86_64 kernels since RHEL4, which is why the /dev/crash
driver was created to replace /dev/mem for those two architectures.
Dave
5846
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Dave Anderson