I was loading a bugzilla bug in a new tab (I'd just loaded in in an existing tab with another bug, realized I wanted to keep that tab, gone back, and opened a new tab). And I had a tbpl.mozilla.org window open in another tab, which is what this XMLHttpRequest was clearly associated with. I crashed due to:  WARNING: unexpected progress values - is server exceeding content length?: file /home/dbaron/builds/ssd/mozilla-central/mozilla/netwerk/protocol/http/nsHttpChannel.cpp, line 5304 Assertion failure: progress <= progressMax (unexpected progress values), at /home/dbaron/builds/ssd/mozilla-central/mozilla/netwerk/protocol/http/nsHttpChannel.cpp:5465 (Same assertion as bug 1018883.) I was running a build from SourceStamp=3c2180b7f1bf ... which is my patch queue up to transition-style-rule-followups as of Tue Sep 23 14:49:26 2014 -0700, on top of mozilla-central revision 9472206fdd12 This Firefox run started at Tue Sep 23 20:18:52 PDT 2014 (uptime 9 days)
Created attachment 8561119 [details] another gdb session (somewhat different e10s-stack) ... on a build from about a week ago.
can you reproduce this?
No. I've posted here every time I've seen it, I believe.
Seems irreproducible. Please reopen when happening again.