Save error
I have seen a number of tests failing where saving a change in the MF VE interface results only in a message "Error, edit not saved".
Here is one recent example: https://integration.wikimedia.org/ci/view/BrowserTests/job/browsertests-MobileFrontend-en.m.wikipedia.beta.wmflabs.org-linux-firefox-sauce/101/testReport/(root)/Wikitext%20Editor%20(Makes%20actual%20saves)/Redirects/
There is no sign of this transaction in fatal.log, and I have not encountered it in a manual operation to check with developer tools.
Possibly related is an entry in dberror.log that may or may not correspond the failed edits:
Wed Jul 23 18:33:07 UTC 2014 deployment-mediawiki02 enwiki WikiPage::doEditContent: Transaction already in progress (from DatabaseBase::begin), performing implicit commit!
Wed Jul 23 18:53:37 UTC 2014 deployment-mediawiki02 enwiki WikiPage::doEditContent: Transaction already in progress (from DatabaseBase::begin), performing implicit commit!
Version: unspecified
Severity: normal
Attached: