Hi! I noticed that the file descriptor of the master pty shared by parent and child pbs_mom processes alternates between blocking and non blocking state. The consequence of this race condition is that read() from mom_writer() sometimes fails, and returns -1, with errno=EAGAIN (which is the expected behaviour when the related file descriptor is not blocking, but this is not expected by the code of mom_writer()), causing the submitted task to terminate unexpectedly. The problem is caused because the corresponding mom_reader() function, from the other process calls write() on this same pty, this function is #defined to write_nonblocking_socket(), and this function temporally change the state of the pty from blocking to non_blocking. I experience this problem systematically in a VM running Fedora 16 x86_64, when submitting interactive jobs. REproducing this case on real hardware (same distro, same packages) is much more difficult. A possible fix would be to gracefully handle the EAGAIN errno in the mom_writer() loop.
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Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.