Module context become NULL on redirect

[Maxim Dounin]

Hello!

On Wed, Jun 09, 2010 at 01:48:10PM +0400, Peter Leonov wrote:

> Hello, devels,
> 
> got a mysterious crash in a module, that relies on request cleanup hook.
> In the cleanup handler the module meets its context pointer
> (via ngx_http_get_module_ctx()) zeroed-out.
> 
> The redirected request hits other location and I believe
> that all contexts have to be dropped. But what could the module do
> if it has some timers set on the redirected request or if the module needs
> to free some memory allocated somewhere out of the request pool?
> 
> The only way I see is to double store the context in the cleanup hook.
> Has somebody such a tricky issue solved this way? ;)

Module contexts are cleared on internal redirects, it's expected 
behaviour.  Cleanup has opaque data pointer which should be used 
to provide needed information to cleanup handler.

Maxim Dounin