For the info, We had the following unserialize error multiple times when
upgrading from 1.10.2 to 15.04.5:
--------------------------------------------------------------------------------------------------------------------------------------------------------------
...
[DBG] 4f (lib/db/upgrade.php:4005) Updating TinyMCE emoticon locations in
mahara database
[WAR] 4f (blocktype/lib.php:601) unserialize(): Error at offset 1995 of 2050
bytes
Call stack (most recent first):
* log_message("unserialize(): Error at offset 1995 of 2050 bytes", 8, true,
true, "/app/apache2/htdocs/mahara/blocktype/lib.php", 601) at
/app/apache2/htdocs/mahara/lib/errors.php:441
* error(8, "unserialize(): Error at offset 1995 of 2050 bytes",
"/app/apache2/htdocs/mahara/blocktype/lib.php", 601, array(size 2)) at Unknown:0
* unserialize("a:6:{s:11:"artefactids";a:1:{i:0;i:3717;}s:11:"pro...") at
/app/apache2/htdocs/mahara/blocktype/lib.php:601
* BlockInstance->get("configdata") at
/app/apache2/htdocs/mahara/lib/db/upgrade.php:4036
* xmldb_core_upgrade("2014092313") at
/app/apache2/htdocs/mahara/lib/upgrade.php:359
* upgrade_core(object(stdClass)) at
/app/apache2/htdocs/mahara/lib/mahara.php:253
* upgrade_mahara(array(size 40)) at
/app/apache2/htdocs/mahara/admin/cli/upgrade.php:50
[WAR] 4f (lib/db/upgrade.php:4037) Invalid argument supplied for foreach()
Call stack (most recent first):
* log_message("Invalid argument supplied for foreach()", 8, true, true,
"/app/apache2/htdocs/mahara/lib/db/upgrade.php", 4037) at
/app/apache2/htdocs/mahara/lib/errors.php:441
* error(2, "Invalid argument supplied for foreach()",
"/app/apache2/htdocs/mahara/lib/db/upgrade.php", 4037, array(size 26)) at
/app/apache2/htdocs/mahara/lib/db/upgrade.php:4037
* xmldb_core_upgrade("2014092313") at
/app/apache2/htdocs/mahara/lib/upgrade.php:359
* upgrade_core(object(stdClass)) at
/app/apache2/htdocs/mahara/lib/mahara.php:253
* upgrade_mahara(array(size 40)) at
/app/apache2/htdocs/mahara/admin/cli/upgrade.php:50
...
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https://bugs.launchpad.net/bugs/1514273
Title:
Increase to "longtext" all text columns that hold serialized user data
Status in Mahara:
Confirmed
Bug description:
We've now had two bugs caused by serialized user data going into a
text database column, and being truncated to 65KB by MySQL:
Bug 1474659: import_entry_requests.entrycontent
Bug 1513851: activity_queue.data
We should try to get ahead of this issue by similarly increasing the
size of any other columns in the database that typically store
serialized user data. For instance, block_instance.configdata. If you
created a text block that contains exactly 65KB of text, it would
probably cause this same error, because, when serialized, it would tip
to just over 65KB.
I can't recall other serialized data columns off the top of my head,
but I imagine there's a few.
Additionally, if we have any other columns that store structured data
with user content inside of it, we should expand those as well. (Are
we storing any JSON-encoded values into the DB yet?). HTML is kind of
an exception, because, while it will break if it's truncated, it won't
generally cause a fatal error if we have broken HTML in the DB.
Instead, htmlpurifier will filter it out when it gets displayed.
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