[Bug linuxthreads/12584] New: timer_delete is unsafe

["panruochen at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12584

           Summary: timer_delete is unsafe
           Product: glibc
           Version: 2.9
            Status: NEW
          Severity: normal
          Priority: P2
         Component: linuxthreads
        AssignedTo: drow@false.org
        ReportedBy: panruochen@gmail.com


Created attachment 5307
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5307
Test code for timer_delete issue

Hi All,

I found a bug in timer_delete.

There may be one more unexpected call to the timer signal handler after the
timer has been successfully deleted by timer_delete().

The test code is in the attachment.

I do some tracing into kernel/glibc source, and guess the issue arises in this
way:

The posix_timer_event() function enqueues a signal, timer_delete() does nothing
to dequeue the signal, and the signal will be sent to the user process
asynchronously in schedule(). 

Best Regards,
PRC
2011/3/15

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