541653 - ###!!! ASSERTION: QueryInterface needed: 'query_result.get() == mRawPtr' while getting the security manager's system principal, with xpcshell at startup

Status: RESOLVED WORKSFORME

(Core :: XPConnect, defect)

Description

[Rain [:rain1] (inactive)]

Freshly built Thunderbird (comm-central + mozilla-central) trunk, debug build, on Windows.

$ mozilla/dist/bin/xpcshell.exe
... component registration stuff ...
###!!! ASSERTION: QueryInterface needed: 'query_result.get() == mRawPtr', file c:\users\sid\mozilla\thunderbird-trunk\mozilla\dist\include\nsCOMPtr.h, line 521

Inspecting this in a debugger, the assertion fires while attempting to execute http://mxr.mozilla.org/mozilla-central/source/js/src/xpconnect/shell/xpcshell.cpp#1799.

At <http://mxr.mozilla.org/mozilla-central/source/xpcom/glue/nsCOMPtr.h#521>, query_result.mRawPtr is null.

This causes xpcshell tests to crash on debug builds, so marking major.

Comment 1

[Rain [:rain1] (inactive)]

A second clobber seems to have fixed it.

Comment 2

[timeless]

So, that probably means an IID changed.

For reference, to actually chase this, you need to go *into* the QI and get the name of the <class>::QueryInterface, because it's basically that <class> that's doing something wrong.