[asterisk-bugs] [Asterisk 0010775]: Asterisk suddenly slows down, and eats 100% cpu

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=10775 
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Reported By:                atis
Assigned To:                
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Project:                    Asterisk
Issue ID:                   10775
Category:                   Core-General
Reproducibility:            random
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:            1.4.10  
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             09-20-2007 16:36 CDT
Last Modified:              09-21-2007 08:37 CDT
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Summary:                    Asterisk suddenly slows down, and eats 100% cpu
Description: 
I'm running 1.4.10 (with reverted res_features from
http://bugs.digium.com/view.php?id=10415). Approximately
once or twice per week (restarted daily) asterisk suddenly starts acting
slowly, and eats 100% cpu. Call volume drops as it takes really long time
for customers to get to agents, but this doesn't improve situation in any
way.

Last week i recompiled with DONT_OPTIMIZE, DEBUG_THREADS and DEBUG_LOCKS,
so now i can attach debug output.

I killed asterisk with "killall -5 asterisk", so that core is dumped.

Attached files:
backtrace.txt - backtraces taken from core

report.txt - various information ("top", "core show threads", "core show
locks", "core show channels") right before i killed asterisk.

normal.txt - top, and channel count when under normal load (30 minutes
after kill)

cli.txt - multiple consecutive executions of "core show threads" and "core
show locks", when problem raised.


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---------------------------------------------------------------------- 
 atis - 09-21-07 08:37  
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No, it is not. My logs are rotaded in night (4am), so that there aren't any
calls.

I looked into backtraces, and it seams to me that there is some problem
with some read()'s in main function of main thread. Could this be somehow
related to having safe_asterisk with default settings (TTY=9, console=yes).


I'm in doubt that something could have caused something to be written in
tty9, however a test of "cat /dev/random > /dev/tty9" slowed down asterisk
a little. I just disabled them, but will have to wait week or more to see
that nothing happens. 

Issue History 
Date Modified   Username       Field                    Change               
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09-21-07 08:37  atis           Note Added: 0070908                          
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