[Bug 40285] Re: libgcc_s.so.1 must be installed for pthread_cancel to work

[Juergen Perlinger]

I have/had trouble with ntpd on saucy, it simly stopped working after a
while with he mentioned error message. Running directly as root works
fine; running with a reduced user account does not. Setting LD_PRELOAD
works.

It seems that the user separation / priviledge dropping interferes with
the delayed load of the SO.  Since several applications seem to be
affected, some of them also using special/reduced user accounts, I'm not
sure if this qualifies as a build or a setup bug, or something entirely
different.

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https://bugs.launchpad.net/bugs/40285

Title:
  libgcc_s.so.1 must be installed for pthread_cancel to work

Status in “gcc-3.3” package in Ubuntu:
  Fix Released
Status in “gcc-4.4” package in Ubuntu:
  Confirmed
Status in “gcc-4.6” package in Ubuntu:
  Confirmed
Status in “pound” package in Ubuntu:
  Invalid

Bug description:
  the error:

   libgcc_s.so.1 must be installed for pthread_cancel to work

  is printed by applications using pthreads and calling:

  set the thread to check or cancel:
  thread_setcancelstate (PTHREAD_CANCEL_ENABLE, NULL);
          pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, NULL);

  and then in a tight loop try to lock a mutex and call test cancel like:
  while (pthread_mutex_trylock (&progress_lock) ==
                                 EBUSY)
                                  pthread_testcancel ();

  if the thread is exited because the parent thread sent a pthread_exit
  (NULL); for instance, you will see that error.

  gcc thinks that this file is in:
  $> gcc --print-file-name=libgcc_s.so.1
  /lib/../lib/libgcc_s.so.1

  and not /lib/libgcc_s.so.1. though the path should really point to the
  same file in the end.

  This error is fixed by adding /lib to /etc/ld.so.conf and running
  ldconfig

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