Adhemerval Zanella
d0e3ffb7a5
nptl: Fix racy pipe closing in tst-cancel{20,21}
...
The tst-cancel20 open two pipes and creates a thread which blocks
reading the first pipe. It then issues a signal to activate the
signal handler which in turn blocks reading the second pipe end.
Finally the cancellation cleanup-up handlers are tested by first
closing the all the pipes ends and issuing a pthread_cancel.
The tst-cancel21 have a similar behavior, but use an extra fork
after the test itself.
The race condition occurs if the cancellation handling acts after the
pipe close: in this case read will return EOF (indicating side-effects)
and thus the cancellation must not act. However current GLIBC
cancellation behavior acts regardless the syscalls returns with
sid-effects.
This patch adjust the test by moving the pipe closing after the
cancellation handling. This avoid spurious cancellation if the case
of the race described.
Checked on x86_64 and i386.
* nptl/tst-cancel20.c (do_one_test): Move the pipe closing after
pthread_join.
* nptl/tst-cancel21.c (tf): Likewise.
2015-12-02 14:45:50 -02:00
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