]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
selftest: Timers: Avoid signal deadlock in leap-a-day
authorJohn Stultz <john.stultz@linaro.org>
Wed, 17 Jun 2015 18:16:43 +0000 (11:16 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 18 Jun 2015 13:28:14 +0000 (15:28 +0200)
commit51a16c1e887a5975ada27a3ae935a4f2783005da
treef2cae7425bb14b2e9b0d4a4e50dd7b841e9dd44a
parent906c55579a6360dd9ef5a3101bb2e3ae396dfb97
selftest: Timers: Avoid signal deadlock in leap-a-day

In 0c4a5fc95b1df (Add leap-second timer edge testing to
leap-a-day.c), we added a timer to the test which checks to make
sure timers near the leapsecond edge behave correctly.

However, the output generated from the timer uses ctime_r, which
isn't async-signal safe, and should that signal land while the
main test is using ctime_r to print its output, its possible for
the test to deadlock on glibc internal locks.

Thus this patch reworks the output to avoid using ctime_r in
the signal handler.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1434565003-3386-1-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
tools/testing/selftests/timers/leap-a-day.c