On Wed, Jan 20, 2021 at 11:18:16AM +0100, Florian Weimer wrote:
> So it's a null pointer dereference.
>
>
> 745 * (largest first) to help achieve an optimal load distribution.
> 746 */
> 747 rpmRC packageBinaries(rpmSpec spec, const char *cookie, int cheating)
> 748 {
> 749 rpmRC rc = RPMRC_OK;
> 750 Package pkg;
> 751 Package *tasks;
> 752 int npkgs = 0;
> 753
> 754 for (pkg = spec->packages; pkg != NULL; pkg = pkg->next)
> 755 npkgs++;
> 756 tasks = xcalloc(npkgs, sizeof(Package));
> 757
> 758 pkg = spec->packages;
> 759 for (int i = 0; i < npkgs; i++) {
> 760 tasks[i] = pkg;
> 761 pkg = pkg->next;
> 762 }
> 763 qsort(tasks, npkgs, sizeof(Package), compareBinaries);
> 764
> 765 #pragma omp parallel
> 766 #pragma omp single
> 767 for (int i = 0; i < npkgs; i++) {
> 768 Package pkg = tasks[i];
> 769 #pragma omp task untied priority(i)
> 770 {
> 771 pkg->rc = packageBinary(spec, pkg, cookie, cheating,
> &pkg->filename);
> 772 rpmlog(RPMLOG_DEBUG,
> 773 _("Finished binary package job, result %d, filename
> %s\n"),
> 774 pkg->rc, pkg->filename);
> 775 if (pkg->rc) {
> 776 #pragma omp critical
> 777 rc = pkg->rc;
> 778 }
> 779 } /* omp task */
> 780 if (rc)
> 781 break;
> 782 }
It is definitely not valid OpenMP, because it is racy (that if (rc) part
with tasks writing that var).
It would need to use atomic accesses to rc, like:
#pragma omp atomic write
rc = pkg->rc;
instead of #pragma omp critical and
rpmRC testrc;
#pragma omp atomic read
testrc = rc;
if (testrc)
break;
But, that shouldn't be the reason why it crashed.
Jakub
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