[Bug nptl/19946] New: Many NPTL tests block for a long time

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19946

            Bug ID: 19946
           Summary: Many NPTL tests block for a long time
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
             Flags: security-

Since commit a28605b22946c708f0a5c4f06307e1a17650ced8 (test-skeleton: increase
default TIMEOUT to 20 seconds), a lot of NTPL tests run for 20 seconds because
they intentionally produce a deadlock and rely on the arrival of SIGALRM to
mark the test as successful:

nptl/tst-cond3.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-eintr1.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-eintr2.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-eintr3.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-eintr4.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-eintr5.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-exit2.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-exit3.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-mutex6.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-rwlock5.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-sem2.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-spin3.c:#define EXPECTED_SIGNAL SIGALRM
nptl/tst-stdio1.c:#define EXPECTED_SIGNAL SIGALRM

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