We are seeing a kernel trap in Hwloc being reported from a few customers.
In one particular case, here are details.
hwloc-1.10.1
Intel(R) Xeon(R) CPU E5-2673 v3 @ 2.40GHz
The offending code is is in look_proc() due to cupid function 0x1 returning 4
logical processors or possibly hwloc_flsl() macro is wrong.
static void look_proc(..)
{
...
infos->max_log_proc = 1 << hwloc_flsl(((ebx >> 16) & 0xff) - 1);
// max_log_proc == 4
...
infos->max_nbthreads = infos->max_log_proc / infos->max_nbcores; //
max_nbthreads == 0
infos->threadid = infos->logprocid % infos->max_nbthreads;
// divide by zero
...
}
It appears hwloc-1.11.10 worked around the cupid issue for AMD processors. We
are currently using this version in current products.
But is there any hwloc version where this is fixed for Intel processors as well?
Thanks,
Robert Scott
