User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b9pre) Gecko/20101230 Firefox/4.0b9pre Built from http://hg.mozilla.org/mozilla-central/rev/ec3e4786877d [New Thread 0x7fe6a85f9710 (LWP 4265)] [New Thread 0x7fe68effe710 (LWP 4266)] Program received signal SIGABRT, Aborted. 0x00007fe6b9e48ba5 in raise () from /lib/libc.so.6 (gdb) bt #0 0x00007fe6b9e48ba5 in raise () from /lib/libc.so.6 #1 0x00007fe6b9e4c6b0 in abort () from /lib/libc.so.6 #2 0x00007fe6bcffff46 in mozalloc_abort(char const*) () from ./libmozalloc.so #3 0x00007fe6be49c401 in NS_DebugBreak_P () from ./libxul.so #4 0x00007fe6bda0271a in ?? () from ./libxul.so #5 0x00007fe6ba97ae24 in _XError () from /usr/lib/libX11.so.6 #6 0x00007fe6ba98130c in ?? () from /usr/lib/libX11.so.6 #7 0x00007fe6ba981d07 in _XEventsQueued () from /usr/lib/libX11.so.6 #8 0x00007fe6ba96a3fd in XPending () from /usr/lib/libX11.so.6 #9 0x00007fe6bbd252a6 in ?? () from /usr/lib/libgdk-x11-2.0.so.0 #10 0x00007fe6bacb0a11 in g_main_context_prepare () from /lib/libglib-2.0.so.0 #11 0x00007fe6bacb0e78 in ?? () from /lib/libglib-2.0.so.0 #12 0x00007fe6bacb145c in g_main_context_iteration () from /lib/libglib-2.0.so.0 #13 0x00007fe6be305d35 in ?? () from ./libxul.so failed to create drawable failed to create drawable ###!!! ABORT: X_FreeGC: BadGC (invalid GC parameter); 3 requests ago: file /builds/slave/cen-lnx64-ntly/build/toolkit/xre/nsX11ErrorHandler.cpp, line 190 _XError+0x000000F4 [/usr/lib/libX11.so.6 +0x00043E24] UNKNOWN [/usr/lib/libX11.so.6 +0x0004A30C] _XEventsQueued+0x00000037 [/usr/lib/libX11.so.6 +0x0004AD07] XPending+0x0000005D [/usr/lib/libX11.so.6 +0x000333FD] UNKNOWN [/usr/lib/libgdk-x11-2.0.so.0 +0x0005A2A6] g_main_context_prepare+0x000001A1 [/lib/libglib-2.0.so.0 +0x00043A11] UNKNOWN [/lib/libglib-2.0.so.0 +0x00043E78] g_main_context_iteration+0x0000006C [/lib/libglib-2.0.so.0 +0x0004445C] UNKNOWN [./libxul.so +0x00F00D35] UNKNOWN [./libxul.so +0x00F00F98] UNKNOWN [./libxul.so +0x01090CB3] UNKNOWN [./libxul.so +0x0105E27E] UNKNOWN [./libxul.so +0x00FB0874] UNKNOWN [./libxul.so +0x010C1CBE] UNKNOWN [./libxul.so +0x00F010A5] UNKNOWN [./libxul.so +0x00DC0909] XRE_main+0x000021B8 [./libxul.so +0x005F69C2] UNKNOWN [./firefox-bin +0x00001B48] __libc_start_main+0x000000FE [/lib/libc.so.6 +0x0001ED8E] UNKNOWN [./firefox-bin +0x00001909] ###!!! ABORT: X_FreeGC: BadGC (invalid GC parameter); 3 requests ago: file /builds/slave/cen-lnx64-ntly/build/toolkit/xre/nsX11ErrorHandler.cpp, line 190 http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=24b63f638579&tochange=e928817fb4e9 Report: http://crash-stats.mozilla.com/report/pending/a721fd91-7081-47fc-a787-9f5cf2101230 Same signature as bug 576933 Mozmill test that triggers the crash: http://hg.mozilla.org/qa/mozmill-tests/file/43f2fb3d66b9/firefox/testPrivateBrowsing/testAboutPrivateBrowsing.js Manual STR: Get a recent (28th->) linux build: Mozilla/5.0 (X11; Linux x86_64; rv:2.0b9pre) Gecko/20101230 Firefox/4.0b9pre Make sure |webgl.enabled_for_all_sites| is enabled (default) 1. Enter Private Browsing mode 2. Click more information (Learn More link)

Asking for blocking because we have a regression from a blocking bug.