[asterisk-bugs] [Asterisk 0017564]: Asterisk "locks up" the system when an external process is called from the 'h' extension with a lower priority than Asterisk.

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17564 
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Reported By:                ramonpeek
Assigned To:                
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Project:                    Asterisk
Issue ID:                   17564
Category:                   Resources/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.33 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-06-29 05:47 CDT
Last Modified:              2010-06-30 07:17 CDT
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Summary:                    Asterisk "locks up" the system when an external
process is called from the 'h' extension with a lower priority than Asterisk.
Description: 
We noticed that Asterisk "locks up" the system when an external process is
called from the 'h' extension with a lower priority than Asterisk.
This issue is a follow up on issue:
https://issues.asterisk.org/view.php?id=16349

See Additional Information Field for more info....
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 (0124075) ramonpeek (reporter) - 2010-06-30 07:17
 https://issues.asterisk.org/view.php?id=17564#c124075 
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As far as I can see the added code in autoservice.c, is indeed the
problem!:

Because we are in the 'h' extension the value of 'as->chan->_softhangup'
is true and variable x is not yet set when it reaches this new piece of
code:

+        if (!x) {
+           continue;
+        }

This is normally not a problem because the asterisk process is running at
the same kernel_priority as the process run in the 'h  extension so that
process gets the chance to be executed.
However when asterisk runs at a higher kernel_priority then the process
running in the 'h' extension, asterisk will 'loop' this part of the code
and the the process in the 'h' extension will hardly get a chance to
execute. Which causes the system to slow down.
And the more priority is given to asterisk, the more likely this is going
to be a problem. Which is very likely the reason that running Asterisk at
highpriority (-p) causes the whole system to "lock up".

Question remains: "Is it wise to reverse this change?" 

Issue History 
Date Modified    Username       Field                    Change               
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2010-06-30 07:17 ramonpeek      Note Added: 0124075                          
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