The same problem here. It sometimes just "Segmentation fault", sometimes with 
"double free or corruption".
No special protocol or server - simple plain AOL ICQ.

version of pidgin and libpurple -  2.4.1-ubuntu2-1 (hardy-updates).

[EMAIL PROTECTED]:~$ /usr/bin/pidgin
Segmentation fault
[EMAIL PROTECTED]:~$ /usr/bin/pidgin
Segmentation fault
[EMAIL PROTECTED]:~$ /usr/bin/pidgin
*** glibc detected *** /usr/bin/pidgin: double free or corruption (fasttop): 
0x081375e8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7609a85]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb760d4f0]
/usr/lib/libglib-2.0.so.0(g_free+0x31)[0xb776ac61]
/usr/lib/libpurple.so.0[0xb7884a1a]
/usr/lib/libpurple.so.0[0xb7884bbf]
/usr/lib/libpurple.so.0[0xb7884ced]
/usr/bin/pidgin[0x80abca3]
/usr/lib/libglib-2.0.so.0[0xb77970ed]
/usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x176)[0xb7762dd6]
/usr/lib/libglib-2.0.so.0[0xb7766193]
/usr/lib/libglib-2.0.so.0(g_main_loop_run+0x1e7)[0xb7766577]
/usr/lib/libgtk-x11-2.0.so.0(gtk_main+0xb4)[0xb7c24264]
/usr/bin/pidgin(main+0xbbc)[0x80c70d5]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb75b4450]
/usr/bin/pidgin[0x806c821]
======= Memory map: ========
08048000-08115000 r-xp 00000000 08:03 110025     /usr/bin/pidgin
08115000-08118000 rw-p 000cc000 08:03 110025     /usr/bin/pidgin
08118000-086a0000 rw-p 08118000 00:00 0          [heap]
b3e00000-b3e21000 rw-p b3e00000 00:00 0 
b3e21000-b3f00000 ---p b3e21000 00:00 0 
b3f96000-b3ff6000 rw-s 00000000 00:09 148176926  /SYSV00000000 (deleted)
b3ff6000-b40fa000 rw-p b3ff6000 00:00 0 
b40fa000-b4181000 r--p 00000000 08:03 73972      
/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf
b4181000-b44a5000 r--s 00000000 08:03 157313     /var/lib/aspell/ru.rws
b44a5000-b45a9000 rw-p b44a5000 00:00 0 
b45a9000-b45ab000 r-xp 00000000 08:03 49398      
/usr/lib/pango/1.6.0/modules/pango-basic-fc.so
b45ab000-b45ac000 rw-p 00001000 08:03 49398      
/usr/lib/pango/1.6.0/modules/pango-basic-fc.so
b45ac000-b463d000 r--p 00000000 08:03 73976      
/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf
b463d000-b4643000 r--s 00000000 08:03 177750     
/var/cache/fontconfig/945677eb7aeaf62f1d50efc3fb3ec7d8-x86.cache-2
b4643000-b4646000 r--s 00000000 08:03 177748     
/var/cache/fontconfig/e383d7ea5fbe662a33d9b44caf393297-x86.cache-2
b4646000-b4649000 r--s 00000000 08:03 177744     
/var/cache/fontconfig/a755afe4a08bf5b97852ceb7400b47bc-x86.cache-2
b4649000-b4650000 r--s 00000000 08:03 177743     
/var/cache/fontconfig/6d41288fd70b0be22e8c3a91e032eec0-x86.cache-2
b4650000-b4653000 r--s 00000000 08:03 177290     
/var/cache/fontconfig/de156ccd2eddbdc19d37a45b8b2aac9c-x86.cache-2
b4653000-b465b000 r--s 00000000 08:03 177289     
/var/cache/fontconfig/e3de0de479f42330eadf588a55fb5bf4-x86.cache-2
b465b000-b4663000 r--s 00000000 08:03 177143     
/var/cache/fontconfig/0f34bcd4b6ee430af32735b75db7f02b-x86.cache-2
b4663000-b4685000 r--s 00000000 08:03 176629     
/var/cache/fontconfig/365b55f210c0a22e9a19e35191240f32-x86.cache-2
b4685000-b4688000 r--s 00000000 08:03 170380     
/var/cache/fontconfig/de9486f0b47a4d768a594cb4198cb1c6-x86.cache-2
b4688000-b468f000 r--s 00000000 08:03 170292     
/var/cache/fontconfig/d52a8644073d54c13679302ca1180695-x86.cache-2
b468f000-b4695000 r--s 00000000 08:03 156947     
/var/cache/fontconfig/089dead882dea3570ffc31a9898cfb69-x86.cache-2
b4695000-b46b5000 r--s 00000000 08:14 194734     
/home/alexey/.fontconfig/2f92cdc6510e3da203a70b3b35416d25-x86.cache-2
b46b5000-b46c4000 r-xp 00000000 08:03 2463       /lib/libbz2.so.1.0.4
b46c4000-b46c5000 rw-p 0000f000 08:03 2463       /lib/libbz2.so.1.0.4
b46c5000-b4724000 r-xp 00000000 08:03 49050      /usr/lib/libgio-2.0.so.0.0.0
b4724000-b4726000 rw-p 0005e000 08:03 49050      /usr/lib/libgio-2.0.so.0.0.0
b4726000-b4758000 r-xp 00000000 08:03 8104       /usr/lib/libcroco-0.6.so.3.0.1
b4758000-b475b000 rw-p 00031000 08:03 8104       /usr/lib/libcroco-0.6.so.3.0.1
b475b000-b478b000 r-xp 00000000 08:03 8365       /usr/lib/libgsf-1.so.114.0.7
b478b000-b478e000 rw-p 0002f000 08:03 8365       /usr/lib/libgsf-1.so.114.0.7
b478e000-b478f000 rw-p b478e000 00:00 0 
b478f000-b47bf000 r-xp 00000000 08:03 8705       /usr/lib/librsvg-2.so.2.22.2
b47bf000-b47c0000 rw-p 00030000 08:03 8705       /usr/lib/librsvg-2.so.2.22.2
b47c0000-b47c7000 r--s 00000000 08:03 138113     
/var/cache/fontconfig/e13b20fdb08344e0e664864cc2ede53d-x86.cache-2
b47c7000-b47d1000 r--s 00000000 08:14 192638     
/home/alexey/.fontconfig/0b48eb22f1b41ea1e4fe3e0689e06727-x86.cache-2
b47d1000-b47f3000 r--p 00000000 08:03 98695      
/usr/share/icons/Crux/icon-theme.cache
b47f3000-b47fb000 r--p 00000000 08:03 124136     
/usr/share/locale-langpack/ru/LC_MESSAGES/gstreamer-0.10.mo
b47fb000-b4809000 r-xp 00000000 08:03 90807      
/usr/lib/gtk-2.0/2.10.0/engines/libcrux-engine.so
b4809000-b480a000 rw-p 0000d000 08:03 90807      
/usr/lib/gtk-2.0/2.10.0/engines/libcrux-engine.so
b480a000-b484e000 r-xp 00000000 08:03 49151      /usr/lib/nss/libnssckbi.so
b484e000-b4859000 rw-p 00044000 08:03 49151      /usr/lib/nss/libnssckbi.so
b4859000-b4893000 r-xp 00000000 08:03 49145      /usr/lib/nss/libfreebl3.so
b4893000-b4894000 rw-p 0003a000 08:03 49145      /usr/lib/nss/libfreebl3.so
b4894000-b48c4000 r-xp 00000000 08:03 49146      /usr/lib/nss/libsoftokn3.so
b48c4000-b48c5000 rw-p 00030000 08:03 49146      /usr/lib/nss/libsoftokn3.so
b48c5000-b48c6000 ---p b48c5000 00:00 0 
b48c6000-b50c6000 rw-p b48c6000 00:00 0 
b50c6000-b50f5000 r-xp 00000000 08:03 210280     /usr/lib/purple-2/libqq.so
b50f5000-b50f6000 rw-p 0002f000 08:03 210280     /usr/lib/purple-2/libqq.so
b50f6000-b510a000 r-xp 00000000 08:03 8216       /usr/lib/libgadu.so.3.5
b510a000-b510b000 rw-p 00013000 08:03 8216       /usr/lib/libgadu.so.3.5
b510d000-b510e000 r-xp 00000000 08:03 11915      
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
b510e000-b510f000 rw-p 00000000 08:03 11915      
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
b510f000-b5113000 r-xp 00000000 08:03 11907      
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
b5113000-b5114000 rw-p 00003000 08:03 11907      
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
b5114000-b5115000 r-xp 00000000 08:03 67980      /usr/lib/purple-2/autorejoin.so
b5115000-b5116000 rw-p 00001000 08:03 67980      /usr/lib/purple-2/autorejoin.so
b5116000-b5118000 r-xp 00000000 08:03 68434      /usr/lib/purple-2/ignore.so
b5118000-b5119000 rw-p 00002000 08:03 68434      /usr/lib/purple-2/ignore.so
b5119000-b511b000 r-xp 00000000 08:03 210262     
/usr/lib/purple-2/dbus-example.so
b511b000-b511c000 rw-p 00001000 08:03 210262     
/usr/lib/purple-2/dbus-example.so
b511c000-b5237000 r-xp 00000000 08:03 8644       /usr/lib/libperl.so.5.8.8
b5237000-b523c000 rw-p 0011a000 08:03 8644       /usr/lib/libperl.so.5.8.8
b523c000-b523e000 rw-p b523c000 00:00 0 
b523e000-b523f000 r-xp 00000000 08:03 210278     /usr/lib/purple-2/libaim.so
b523f000-b5240000 rw-p 00001000 08:03 210278     /usr/lib/purple-2/libaim.so
b5240000-b5241000 r-xp 00000000 08:03 68435      /usr/lib/purple-2/irc-more.so
b5241000-b5242000 rw-p 00000000 08:03 68435      /usr/lib/purple-2/irc-more.so
b5242000-b524e000 r-xp 00000000 08:03 210264     /usr/lib/purple-2/libgg.so
b524e000-b524f000 rw-p 0000b000 08:03 210264     /usr/lib/purple-2/libgg.so
b524f000-b525a000 r-xp 00000000 08:03 210248     /usr/lib/purple-2/perl.so
b525a000-b525b000 rw-p 0000b000 08:03 210248     /usr/lib/purple-2/perl.so
b525b000-b5264000 r-xp 00000000 08:03 6389       
/lib/tls/i686/cmov/libcrypt-2.7.so
b5264000-b5266000 rw-p 00008000 08:03 6389       
/lib/tls/i686/cmov/libcrypt-2.7.so
b5266000-b528d000 rw-p b5266000 00:00 0 
b528e000-b5290000 r-xp 00000000 08:03 210253     /usr/lib/purple-2/autoaccept.so
b5290000-b5291000 rw-p 00001000 08:03 210253     /usr/lib/purple-2/autoaccept.so
b5291000-b5292000 r-xp 00000000 08:03 210258     /usr/lib/purple-2/newline.so
b5292000-b5293000 rw-p 00000000 08:03 210258     /usr/lib/purple-2/newline.so
b5293000-b529d000 r-xp 00000000 08:03 50614      
/usr/lib/sasl2/libdigestmd5.so.2.0.22
b529d000-b529e000 rw-p 0000a000 08:03 50614      
/usr/lib/sasl2/libdigestmd5.so.2.0.22
b529e000-b53c8000 r-xp 00000000 08:03 12045      
/usr/lib/i686/cmov/libcrypto.so.0.9.8
b53c8000-b53dd000 rw-p 00129000 08:03 12045      
/usr/lib/i686/cmov/libcrypto.so.0.9.8
b53dd000-b53e0000 rw-p b53dd000 00:00 0 
b53e0000-b53e3000 r-xp 00000000 08:03 50604      
/usr/lib/sasl2/libanonymous.so.2.0.22
b53e3000-b53e4000 rw-p 00002000 08:03 50604      
/usr/lib/sasl2/libanonymous.so.2.0.22
b53e4000-b53e8000 r-xp 00000000 08:03 50609      
/usr/lib/sasl2/libcrammd5.so.2.0.22
b53e8000-b53e9000 rw-p 00003000 08:03 50609      
/usr/lib/sasl2/libcrammd5.so.2.0.22
b53e9000-b53ec000 r-xp 00000000 08:03 50619      
/usr/lib/sasl2/liblogin.so.2.0.22
b53ec000-b53ed000 rw-p 00002000 08:03 50619      
/usr/lib/sasl2/liblogin.so.2.0.22
b53ed000-b53f0000 r-xp 00000000 08:03 50629      
/usr/lib/sasl2/libplain.so.2.0.22
b53f0000-b53f1000 rw-p 00002000 08:03 50629      
/usr/lib/sasl2/libplain.so.2.0.22
b53f1000-b5407000 r-xp 00000000 08:03 8712       /usr/lib/libsasl2.so.2.0.22
b5407000-b5408000 rw-p 00015000 08:03 8712       /usr/lib/libsasl2.so.2.0.22
b5408000-b540a000 r-xp 00000000 08:03 210259     /usr/lib/purple-2/offlinemsg.so
b540a000-b540b000 rw-p 00001000 08:03 210259     /usr/lib/purAborted

-- 
pidgin crashes with glibc error "double free or corruption"
https://bugs.launchpad.net/bugs/184796
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