Icedtea6-1.7 Plugin with chromium constantly segfaults

[B R]

Hi,

I am a user of Icedtea plugin with chromium.
Since the last version (Icedtea6-1.7-r1) on gentoo, segfaults occur
everytime a java applet  is loaded, sometimes leading to
chrome segfaulting then crashing  the plugin.

The question is, how can I get meaningfull backtraces about those errors.
Where do I have to start to give you interesting thing to working on and by
the way learn about debuging.

The only thing I got for now is :

Segmentation fault occurred at 4e6a6100 in
/opt/icedtea6-bin-1.7/jre/bin/java[java:5259] uid/euid:1000/1000
gid/egid:1004/1004, parent /opt/
chromium.org/chrome-linux/chrome[chrome:5232] uid/euid:1000/1000
gid/egid:1004/1004

[ 6479.550127] grsec: denied resource overstep by requesting 69632 for
RLIMIT_MEMLOCK against limit 65536 for
/opt/chromium.org/chrome-linux/chrome[chrome:4981] uid/euid:1000/1000
gid/egid:1004/1004, parent
/opt/chromium.org/chrome-linux/chrome[chrome:4073] uid/euid:1000/1000
gid/egid:1004/1004

chrome[5232]: segfault at 51705fcf ip 50b3c7b0 sp 51705fc0 error 7 in
libstdc++.so.6.0.10[50a84000+e2000]

Thank you for your help.
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