On 11/29/2011 02:42 PM, Andrew Haley wrote:
On 11/29/2011 02:01 PM, Gordan Bobic wrote:
> One other thing - one of the manifestations of this bug appears to be
> random memory corruption (strange, I know - unless I am dealing with two
> totally unrelated problems). Specifically, I have seen the bug manifest
> during compile jobs where, for example, linking would segfault, and
> re-making would segfault again. But doing:
> echo 3> /proc/sys/vm/drop_caches
> would fix the problem.
> My first suspicion was duff hardware/RAM on my AC100. So I got another
> one, and it behaves in the exact same way.
The most likely explanation is that you've got a data race somewhere.
SMP ARM, unlike x86, has a weakly-ordered memory model. Unless
everyone is extremely careful, problems like the one you're describing
are very likely.
Indeed, I was thinking about some kind of a concurrency issue, too, but
the question is how to fix it. Assuming for a moment that it is not a
kernel issue (other people are running he same kernel with Ubuntu
without this problem), are we talking about glibc? Or are you saying
that _any_ package could be responsible for such a thing?
How can this be fixed?