Topic on Project:Support desk

Hello,

I'm trying to do a fresh install. I verified the tarball and uploaded it to the server.

When I try to install I get this:

(Also reported here: Topic:T70tn1irrw8ny8ts)

Exception encountered, of type "Wikimedia\Assert\ParameterAssertionException"

[V3uvKsCoKvAAAFjq0lIAAAVl] /p/mw-config/index.php Wikimedia\Assert\ParameterAssertionException from line 63 of /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/vendor/wikimedia/assert/src/Assert.php: Bad value for parameter maxKeys: must be above zero

Backtrace:

#0 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/libs/objectcache/HashBagOStuff.php(49): Wikimedia\Assert\Assert::parameter(boolean, string, string)

#1 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/libs/objectcache/CachedBagOStuff.php(46): HashBagOStuff->__construct(array)

#2 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/session/SessionManager.php(172): CachedBagOStuff->__construct(EmptyBagOStuff)

#3 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/session/SessionManager.php(85): MediaWiki\Session\SessionManager->__construct()

#4 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/WebRequest.php(700): MediaWiki\Session\SessionManager::singleton()

#5 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/session/SessionManager.php(121): WebRequest->getSession()

#6 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/Setup.php(745): MediaWiki\Session\SessionManager::getGlobalSession()

#7 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/includes/WebStart.php(137): require_once(string)

#8 /mnt/web006/e3/17/56865117/htdocs/lursenorg/p/mw-config/index.php(36): require(string)

#9 {main}

I tried uploading to the server again, same result.

Any help is highly appreciated.

Strange, a fresh install on my home server (Debian Jessie) is without any problems.

But installing on my ISP's server gives me this trouble. A fresh install of 1.26.3 on my ISP's server goes without any problems though.

However, changing the file includes/libs/objectcache/HashBagOStuff.php gets me up and running. Just commenting out line 49 does the trick.

change:

Assert::parameter( $this->maxCacheKeys > 0, 'maxKeys', 'must be above zero' );

to:

/**

*    Assert::parameter( $this->maxCacheKeys > 0, 'maxKeys', 'must be above zero' );

*/

But I don't know if this is safe to do.

Can someone please shed some light on this?

Maybe you need to purge a cache store like memcached or similar on the ISP's server? Have you defined any caching on your LocalSettings.php?

Thanks for your answer.

Without the change to includes/libs/objectcache/HashBagOStuff.php setup simply crashes. Mind you, I'm doing a fresh install, brandnew database, not an upgrade. Moreover, I never used memcached or similar before, so there is no cache to reset/empty.

In LocalSettings.php I've got this:

## Shared memory settings

$wgMainCacheType = CACHE_NONE;

$wgMemCachedServers = [];

But I can't imagine that to be relevant at all. After all, I only get to the point that setup generates the file if I changed includes/libs/objectcache/HashBagOStuff.php.

I don't understand why this assert is even there (unconditional). I get that you need a value of >0, IF you use these caches...

Ah, I didn't understood it right. Yeah, that does indeed look like a bug. The assert should be there, but the installer shouldn't be using it. Can you please report it as a bug? Link the bug report here if you do. There seem to be some probems with this new session manager that has been introduced in 1.27.

There's more to it: If I restore the original includes/libs/objectcache/HashBagOStuff.php after setup has been done successfully, I get:

Exception encountered, of type "Wikimedia\Assert\ParameterAssertionException"

So just like in Topic:T70tn1irrw8ny8ts but without the backtrace I get starting a fresh install.

Bug report is here: