Bug#555205: segfault caused by optimized library?

[deb <theedge456@free.fr>]

Hello,

I want to know if the bug is closed. I still see this msg:

critical bugs of libc6 (2.9-23em1 -> 2.11.2-2) <unfixed>
 #555205 - libc6: segfault when upgrading from 2.9-25 -> 2.10.1-5 on 
squeeze renders system unusable