0004529: mod_caucho threading issue

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Category

Severity

Reproducibility

Date Submitted

Last Update

0004529

[Resin]

minor

always

04-29-11 10:04

05-17-11 10:01

Reporter

ferg

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

Summary

0004529: mod_caucho threading issue

Description

(rep by remkodev)

See http://forum.caucho.com/showthread.php?t=27741 [^]

The thread's last resin function is cse_free_lock

cse_free_lock(config_t *config, void *vlock)
{
apr_thread_mutex_destroy(vlock);
}

After some research, it appears that apr_thread_mutex_destroy(vlock); is not thread safe.

(https://www.securecoding.cert.org/co...read%27s+mutex) [^]

We figured that because our webservers uses multiple resin servers (around 6) in each vhost/apache instance these will cause the race condition over the thread_mutex_destroy method.

Today I altered the configuration of the most busy app ( Note: 0000090% off the hits) to be proxied to a seprate webserver with only 1 resin host configured. This setup did not cause a single hanging process for over 4 hours.

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Issue History
Date Modified	Username	Field	Change
04-29-11 10:04	ferg	New Issue
05-17-11 10:01	ferg	Assigned To	=> ferg
05-17-11 10:01	ferg	Status	new => closed
05-17-11 10:01	ferg	Resolution	open => fixed
05-17-11 10:01	ferg	Fixed in Version	=> 4.0.19

Mantis 1.0.0rc3[^]

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