Recent i686 (i.e. 32-bit) mozilla-central builds of Linux always crash on startup on my Ubuntu 7.10 (32-bit) machine. I'll post a gdb trace in my next comment. Here's a regression range: firefox-2008-12-07-02-mozilla-central firefox-2008-12-08-02-mozilla-central http://hg.mozilla.org/mozilla-central/pushloghtml?startdate=2008-12-07+00%3A00%3A00&enddate=2008-12-08+05%3A06%3A00 I can't figure out which patch (in this range) might have triggered/caused the problem. I also assume that my problem is (somehow) specific to my setup -- if every Linux user had this problem, there'd be *lots* of complaints. The problem doesn't happen with today's 1.9.1-branch and 1.9.0-branch Linux i686 nightlies.

Here's a gdb trace of my crash on startup. I made it using an opt build with debug symbols that I built from source. But for some reason it contains no browser-specific debug info. I ran the browser in gdb by changing to my build's [obj-dir]/dist/bin directory and running './run-mozilla.sh -g firefox-bin -d gdb'. By the way the same crash also happens in recent Linux tryserver builds ... on my system, at least. Side note: When I run a recent nightly or tryserver build, I often see Breakpad come up. But, though I tell it to submit a bug report, it spins for a long time without doing so.

I get the same crash (at gdk_x11_get_default_xdisplay) running today's x86_64 nightly on my 64-bit machine (also running Ubuntu 7.10). Its stack trace is slightly more informative.

Turns out this was caused by the patch for bug 460926, and is a dup of bug 468845. And wherever I mentioned Ubuntu above I should have said Kubuntu ... since (like the reporter of bug 468845) I'm also running KDE 3.X.

Oops. It's a dup of bug 468845.