Hello,
We are having an issue using Apache/2.2.15 (Unix) mod_wsgi/3.3 Python/2.7.3
worker MPM/daemon mode, where apache restarts cause daemon processes to
become orphaned (adopt ppid 1 and continue to run app code but not take
http requests).
Each time the error occurs, we will see something like:
[Thu Nov 17 22:15:00 2016] [warn] child process 23371 still did not exit,
sending a SIGTERM
[Thu Nov 17 22:15:02 2016] [warn] child process 23371 still did not exit,
sending a SIGTERM
[Thu Nov 17 22:15:04 2016] [warn] child process 23371 still did not exit,
sending a SIGTERM
[Thu Nov 17 22:15:06 2016] [error] child process 23371 still did not exit,
sending a SIGKILL
.. where pid 23371 was an httpd worker.
This causes me to assume that the root worker (initial process spawned by
httpd and owned by root) sends (TERM, TERM, TERM, KILL) to the worker(s),
which then attempts to kill the daemon processes but can't for some reason
and that causes it to not respond to it's parent's requests to die.
However, this does not make sense to me because that worker is run by
low-privilege apache user which does not have ability to kill our daemon
processes (which have a different uid/gid). We have tried permutations of
different users and privileges and nothing helps.
We can easily send a TERM to any of the daemon processes manually (orphaned
or not), and they die cleanly in well under the 3 second window that apache
uses. They die, and mod_wsgi emits something to the httpd log saying they
were aborted. It just doesn't happen when httpd tries to do it.
We are using C modules, and we have enabled WSGIApplicationGroup ${GLOBAL}
and as far as we can tell our permissions and vhost configuration is right.
The application works well at runtime.
In order to continue to debug this, we were hoping to find out exactly how
the daemons are signaled that they should exit. Tracing the daemon
processes with sysdig shows nothing about them getting any signals from
httpd to terminate.
Any ideas or tips on how to put the pieces together?
Thanks!
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