glibc crash when launching certain applications

I just update my system and when I launch certain applications it crash instantly. I didn't have time to install gdb and then right now my system is completly useless cause I cannot fix it by installing any update.

By example when trying to launch apt-get:
$ sudo apt-get install gdb
*** glibc detected *** sudo: free(): invalid pointer: 0xb7cd3b70 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7e798c5]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb7e7d330]
/lib/tls/i686/cmov/libc.so.6(__libc_dlsym+0x90)[0xb7f1c220]
/lib/tls/i686/cmov/libc.so.6(__nss_lookup_function+0x153)[0xb7ef5eb3]
/lib/tls/i686/cmov/libc.so.6[0xb7ec9eee]
/lib/tls/i686/cmov/libc.so.6(getaddrinfo+0x199)[0xb7ecb919]
sudo[0x804ef45]
sudo[0x8050000]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb7e243a0]
sudo[0x804a521]
======= Memory map: ========
08048000-08062000 r-xp 00000000 08:11 1406301 /usr/bin/sudo
08062000-08063000 rw-p 00019000 08:11 1406301 /usr/bin/sudo
08063000-08087000 rw-p 08063000 00:00 0 [heap]
b7c9b000-b7ca5000 r-xp 00000000 08:11 165136 /lib/libgcc_s.so.1
b7ca5000-b7ca6000 rw-p 0000a000 08:11 165136 /lib/libgcc_s.so.1
b7ca6000-b7caf000 r-xp 00000000 08:11 198427 /lib/tls/i686/cmov/libnss_files-2.7.so
b7caf000-b7cb1000 rw-p 00008000 08:11 198427 /lib/tls/i686/cmov/libnss_files-2.7.so
b7cb1000-b7cb9000 r-xp 00000000 08:11 198429 /lib/tls/i686/cmov/libnss_nis-2.7.so
b7cb9000-b7cbb000 rw-p 00007000 08:11 198429 /lib/tls/i686/cmov/libnss_nis-2.7.so
b7cbb000-b7ccf000 r-xp 00000000 08:11 198424 /lib/tls/i686/cmov/libnsl-2.7.so
b7ccf000-b7cd1000 rw-p 00013000 08:11 198424 /lib/tls/i686/cmov/libnsl-2.7.so
b7cd1000-b7cd4000 rw-p b7cd1000 00:00 0
b7cd4000-b7cdb000 r-xp 00000000 08:11 198425 /lib/tls/i686/cmov/libnss_compat-2.7.so
b7cdb000-b7cdd000 rw-p 00006000 08:11 198425 /lib/tls/i686/cmov/libnss_compat-2.7.so
b7cea000-b7d29000 r--p 00000000 08:11 1456514 /usr/lib/locale/en_CA.utf8/LC_CTYPE
b7d29000-b7d2a000 r--p 00000000 08:11 1456519 /usr/lib/locale/en_CA.utf8/LC_NUMERIC
b7d2a000-b7d2b000 r--p 00000000 08:11 1456522 /usr/lib/locale/en_CA.utf8/LC_TIME
b7d2b000-b7e0b000 r--p 00000000 08:11 1456513 /usr/lib/locale/en_CA.utf8/LC_COLLATE
b7e0b000-b7e0c000 r--p 00000000 08:11 1456517 /usr/lib/locale/en_CA.utf8/LC_MONETARY
b7e0c000-b7e0d000 r--p 00000000 08:11 1471716 /usr/lib/locale/en_CA.utf8/LC_MESSAGES/SYS_LC_MESSAGES
b7e0d000-b7e0e000 rw-p b7e0d000 00:00 0
b7e0e000-b7f57000 r-xp 00000000 08:11 198418 /lib/tls/i686/cmov/libc-2.7.so
b7f57000-b7f58000 r--p 00149000 08:11 198418 /lib/tls/i686/cmov/libc-2.7.so
b7f58000-b7f5a000 rw-p 0014a000 08:11 198418 /lib/tls/i686/cmov/libc-2.7.so
b7f5a000-b7f5e000 rw-p b7f5a000 00:00 0
b7f5e000-b7f60000 r-xp 00000000 08:11 198421 /lib/tls/i686/cmov/libdl-2.7.so
b7f60000-b7f62000 rw-p 00001000 08:11 198421 /lib/tls/i686/cmov/libdl-2.7.so
b7f62000-b7f6b000 r-xp 00000000 08:11 163629 /lib/libpam.so.0.81.6
b7f6b000-b7f6c000 rw-p 00008000 08:11 163629 /lib/libpam.so.0.81.6
b7f6c000-b7f6d000 r--p 00000000 08:11 1456520 /usr/lib/locale/en_CA.utf8/LC_PAPER
b7f6d000-b7f6e000 r--p 00000000 08:11 1456518 /usr/lib/locale/en_CA.utf8/LC_NAME
b7f6e000-b7f6f000 r--p 00000000 08:11 1456512 /usr/lib/locale/en_CA.utf8/LC_ADDRESS
b7f6f000-b7f70000 r--p 00000000 08:11 1456521 /usr/lib/locale/en_CA.utf8/LC_TELEPHONE
b7f70000-b7f71000 r--p 00000000 08:11 1456516 /usr/lib/locale/en_CA.utf8/LC_MEASUREMENT
b7f71000-b7f78000 r--s 00000000 08:11 1424145 /usr/lib/gconv/gconv-modules.cache
b7f78000-b7f79000 r--p 00000000 08:11 1456515 /usr/lib/locale/en_CA.utf8/LC_IDENTIFICATION
b7f79000-b7f7b000 rw-p b7f79000 00:00 0
b7f7b000-b7f7c000 r-xp b7f7b000 00:00 0 [vdso]
b7f7c000-b7f96000 r-xp 00000000 08:11 163559 /lib/ld-2.7.so
b7f96000-b7f97000 r--p 00019000 08:11 163559 /lib/ld-2.7.so
b7f97000-b7f98000 rw-p 0001a000 08:11 163559 /lib/ld-2.7.so
bfc3d000-bfc52000 rw-p bffeb000 00:00 0 [stack]
Aborted