Fix mainloop call crash on freebsd#4262
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MrAnno merged 2 commits intoDec 29, 2022
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As a preparation for fixing syslog-ng#4258, this patch extracts a few lines as a new function from main_loop_call(). The goal of the new function is to wait for any pending executions of mainloop-calls, which can happen if a worker thread submits a new one while the old is still executing. At the moment, there can be only ONE outstanding mainloop-calls at the same time. Signed-off-by: Balazs Scheidler <bazsi77@gmail.com>
…ead deinit time As explained in syslog-ng#4258, a crash can happen in syslog-ng if a worker thread exits while a mainloop call is still being processed. The solution is to prevent the worker from exiting until that pending call is finished. NOTE: in this state the worker is not going to execute tasks, but for all ivykis knows this thread does not really exist anymore. So if the workpool requires new threads, they are going to be launched, while this exists in limbo. Reported-by: @chucksilvers Signed-off-by: Balazs Scheidler <bazsi77@gmail.com>
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Btw I reproduced the issue by inserting a sleep(15) into a mainloop_call handler, to trigger a worker exit while the call is executing. The one I used was the ml_batched_timer()'s update function. |
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…yslog-ng#4302, syslog-ng#4305, syslog-ng#4313 Signed-off-by: Attila Szakacs <szakacs.attila96@gmail.com>
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…yslog-ng#4302, syslog-ng#4305, syslog-ng#4313 Signed-off-by: Attila Szakacs <szakacs.attila96@gmail.com>
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The patches in this branch fixes #4258.
Thanks a lot for @chucksilvers for the diagnosis and the proposed fix. At the end I wasn't using the proposed fix as it was, but I did included a Reported-By header. This fix would probably not exist today if it wasn't your hard work to reproduce and diagnose the issue.