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pthread_barrier_wait can return either PTHREAD_BARRIER_SERIAL_THREAD
or 0. Posix makes no guarantees about which thread return the unique
value.
Additionally, pthread_join was not called despite seemingly checking
for the error.
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nptl/tst-setuid3.c was using the `err' and `errx' functions to write
error messages. This wrote to stderr instead of the preferred stdout.
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If a call to the set*id functions fails in a multi-threaded program,
the abort introduced in commit 13f7fe35ae2b0ea55dc4b9628763aafdc8bdc30c
was triggered.
We address by checking that all calls to set*id on all threads give
the same result, and only abort if we see success followed by failure
(or vice versa).
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