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

Platform

Status

closed

Projection

none

OS Version

ETA

none

Fixed in Version

4.0.19

Product Version

Product Build

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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