[Bug libc/17506] New: Testcase string/tst-strcoll-overflow fails due to returning before timeout

["stli at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17506

            Bug ID: 17506
           Summary: Testcase string/tst-strcoll-overflow fails due to
                    returning before timeout
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: stli at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com

Hi,

the testcase string/tst-strcoll-overflow (make xcheck) fails.
See tst-strcoll-overflow.out:
0
Expected signal 'Alarm clock' from child, got none

The failure was introduced with commit
"[BZ 15884] strcoll: improve performance by removing the cache"
(see: https://sourceware.org/ml/libc-alpha/2014-10/msg00474.html)

The testcase calls strcoll with a large string and sets a timeout of 300s and
expects SIGALRM in order to pass. If the strcoll()-call returns in time,
test-skeleton.c expects the signal of the timeout and then the testcase is
failing.

I measured the execution time of this testcase between 35...60s
after the mentioned patch on s390, ppc, x86_64. Before the patch,
the execution time exceeds the 300s.

Bye
Stefan

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