- **status**: accepted --> review
---
** [tickets:#2420] imm: IMMND on PL hangs when headless**
**Status:** review
**Milestone:** 5.0.2
**Created:** Tue Apr 11, 2017 07:13 AM UTC by Hung Nguyen
**Last Updated:** Tue Apr 11, 2017 07:13 AM UTC
**Owner:** Hung Nguyen
IMMND on PL hangs at waitpid() after coordinator removal.
When pbe process is in D State (Uninterruptible sleep (usually IO)), waitpid()
will be hung if WNOHANG is not specified.
~~~
LOG_WA("SC were absent and PBE appears hung, sending SIGKILL");
kill(cb->pbePid, SIGKILL);
waitpid(cb->pbePid, NULL, 0);
~~~
The bug is introduced by [#2296].
Solution: Use waitpid() with WNOHANG specified. Check for pbe/sync process
exiting before sending introduce message during headless.
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