Messages in this thread | | | Date | Mon, 01 Apr 2013 08:07:59 +0800 | From | Chen Gang <> | Subject | Re: [PATCH 1/3] posix-timers: Correctly get dying task time sample in posix_cpu_timer_schedule() |
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On 2013年03月30日 21:15, Frederic Weisbecker wrote: > In order to arm the next timer to schedule, we take a sample of the > current process or thread cputime. > > If the task is dying though, we don't arm anything but we > cache the remaining timer expiration delta for further reads. > > Something similar is performed in posix_cpu_timer_get() but > here we forget to take the process wide cputime sample > before caching it. > > As a result we are storing random stack content, leading > every further reads of that timer to return junk values. > > Fix this by taking the appropriate sample in the case of > process wide timers. > > Reported-by: Andrew Morton <akpm@linux-foundation.org> > Reported-by: Chen Gang <gang.chen@asianux.com> > Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> > Cc: Stanislaw Gruszka <sgruszka@redhat.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> > Cc: Ingo Molnar <mingo@elte.hu> > Cc: Oleg Nesterov <oleg@redhat.com> > Cc: Chen Gang <gang.chen@asianux.com> > ---
thank you for mark me as reported by, although I reported too late (Andrew Morton is the first reporter).
next, I should continue to try to find another issues about kernel.
:-)
-- Chen Gang
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