.
Thread 1 (process 6509):
#0  0xb7356bfb in strlen () from /lib/tls/i686/cmov/libc.so.6
#1  0xb76b086e in g_strdup () from /usr/lib/libglib-2.0.so.0
#2  0xb774da65 in pango_font_description_copy ()
   from /usr/lib/libpango-1.0.so.0
#3  0xb775a493 in pango_layout_set_font_description ()
   from /usr/lib/libpango-1.0.so.0
#4  0x08064928 in ?? ()
#5  0x08064b06 in ?? ()
#6  0x08065871 in ?? ()
#7  0x080660f0 in ?? ()
#8  0xb7f019cb in pkgAcquire::Worker::RunMessages ()
   from /usr/lib/libapt-pkg-libc6.4-6.so.3.53
#9  0xb7f02880 in pkgAcquire::Worker::InFdReady ()
   from /usr/lib/libapt-pkg-libc6.4-6.so.3.53
#10 0xb7efa1a9 in pkgAcquire::RunFds ()
   from /usr/lib/libapt-pkg-libc6.4-6.so.3.53
#11 0xb7efd44f in pkgAcquire::Run ()
   from /usr/lib/libapt-pkg-libc6.4-6.so.3.53
#12 0x080b7091 in ?? ()
#13 0x080843a6 in ?? ()
#14 0x0805910b in ?? ()
#15 0xb72feebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#16 0x080570e1 in ?? ()