Re: [Wrapper-user] wrapper process is hung

[David B. <da...@da...>]

Howdy, ANSI C is notoriously prone to memory leaks because of the use of 
functions: malloc() and free() to dynamically allocate memory for the 
target program's runtime.

If you have considerable ANSI C background you will already know the 
associated problems and possible diagnostics.

If not the C language is much more tied to the hardware platform the 
compiler is running on as opposed to something like: Java.

In the case you are running on a Linux you are in luck. Without 
investment you can start w/ mtrace and with a little more work to 
profile you program you can use Valgrind.

In the event you are on Windows (wrapper of course) then you can use 
Purify.

In any event you will have to profile the runtime and 1 solution is 
heavy use of logging to help narrow down the culprit code.

I saw no responses on SO so it appears you will have to dig into the 
code.

C language is because of age and distribution very well documented and 
lots of references on Google as you probably already know.


On 2016-02-08 22:41, Cade Thacker wrote:
> Hello All,
> I'm not sure how to figure this out so figured I would turn to the
> experts.
> 
> I documented everything here:
> 
> http://stackoverflow.com/questions/35283549/java-service-wrapper-parent-process-is-hung
> [1]
> 
> But the simple summary is that when I issue a kill $pid (SIGTERM/15)
> on the wrapper process (the JVM is long dead via something else
> killing it with SIGKILL/9) nothing happens. (this is the same call
> from stopit() in the wrapper.sh distributed by you all.
> 
> As documented in the other question, that causes other issues
> downstream because without the wrapper dying correctling, I can't
> restart them both.
> 
> Any ideas on how to best trouble shoot this?  I'm not sure what would
> be "stuck" in the wrapper C code so that a SIGTERM would not be
> properly processed? SIGKILL/9 works as expected.
> 
> If this was a Java process, I'd get a thread dump and a heap dump, but
> not sure how to attack this C code.  Maybe dig through something in
> /proc/$pid?
> 
> Any help is incredibly appreciated!
> 
> --
> 
> --cade
> 
> Links:
> ------
> [1]
> http://stackoverflow.com/questions/35283549/java-service-wrapper-parent-process-is-hung
> 
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