malloc problems in -current malloc_usable_size()

Hi,

I updated my kernel/world yesterday and thunderbird 3.0.2 started core
dumping after I completed the upgrade.   It continued to do so on
previously good operations after a full re-compile.

I noticed that some jemalloc changes went in and was wondering if anyone
else was noticing SEGV problems in other apps with malloc_usable_size()
or ARENA problems in threaded apps?

0x28eacb14 in malloc_usable_size () from /lib/libc.so.7


(gdb) bt


#0  0x28eacb14 in malloc_usable_size () from /lib/libc.so.7


#1  0x28eadbaa in free () from /lib/libc.so.7


#2  0x2ed9ac22 in gss_release_buffer () from /usr/lib/libgssapi.so.10


#3  0x2ed9a5ea in gss_release_name () from /usr/lib/libgssapi.so.10


#4  0x2ed96ec9 in gss_init_sec_context () from /usr/lib/libgssapi.so.10


#5  0x2ec0aab4 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libauth.so

#6  0x2ec0b5c1 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libauth.so

#7  0x291853ea in nsMsgProtocol::AsyncOpen () from
/usr/local/lib/thunderbird-3.0.2/components/libmail.so

#8  0x29255b30 in nsStopwatch::QueryInterface () from
/usr/local/lib/thunderbird-3.0.2/components/libmail.so

#9  0x29255dc5 in nsStopwatch::QueryInterface () from
/usr/local/lib/thunderbird-3.0.2/components/libmail.so
#10 0x291832ee in nsMsgProtocol::OnDataAvailable () from
/usr/local/lib/thunderbird-3.0.2/components/libmail.so
#11 0x2986ff02 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libnecko.so
#12 0x298700b6 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libnecko.so
#13 0x281f8844 in NS_AsyncCopy () from
/usr/local/lib/thunderbird-3.0.2/libxpcom_core.so
#14 0x28212846 in NS_SetGlobalThreadObserver () from
/usr/local/lib/thunderbird-3.0.2/libxpcom_core.so
#15 0x281d3b7f in NS_ProcessNextEvent_P () from
/usr/local/lib/thunderbird-3.0.2/libxpcom_core.so
#16 0x29a54281 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libwidget_gtk2.so
#17 0x29ba1687 in NSGetModule () from
/usr/local/lib/thunderbird-3.0.2/components/libtoolkitcomps.so
#18 0x2819967d in XRE_main () from
/usr/local/lib/thunderbird-3.0.2/libxul.so