[asterisk-bugs] [Asterisk 0018811]: [patch] Seems Like ast_read / timerfd_timer_ack Causes lockups and resource drain

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18811 
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Reported By:                irroot
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18811
Category:                   Resources/res_timing_timerfd
Reproducibility:            random
Severity:                   major
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           1.6.2.17-rc2 
JIRA:                       SWP-3126 
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:             2011-02-15 02:31 CST
Last Modified:              2011-04-12 14:16 CDT
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Summary:                    [patch] Seems Like ast_read / timerfd_timer_ack
Causes lockups and resource drain
Description: 
The system locks up eventually and as it is holding a channel lock things
like pickup and walking channels locked will cause a deadlock ...

i have reverted to dahdi timer that is not prone to this problem.


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Relationships       ID      Summary
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related to          0018791 [patch] Deadlock sip_read check_rtp_tim...
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 (0133669) astmiv (reporter) - 2011-04-12 14:16
 https://issues.asterisk.org/view.php?id=18811#c133669 
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Added patch resolves this deadlock problem.

Problem was that at some time the timing rate was set to 0 (zero) and
after this a call to ast_timer_ack was done which in its turn would do a
call to read().

Setting the rate of the timerfd to 0 stops the timerfd.

The patch cheks if the timer rate is set to 0. If so return otherwise
continue and read ticks. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-04-12 14:16 astmiv         Note Added: 0133669                          
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