gdb bt 0xb7e363fb in raise from lib libpthread so signal handler calle

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(gdb) bt
#0 0xb7e363fb in raise () from /lib/libpthread.so.0
#1 <signal handler called>
#2 0xb69d17a0 in process_timeouts () from /usr/lib/libcares.so.2
#3 0xb69d231c in ares_process_fd () from /usr/lib/libcares.so.2
#4 0xb7ccdb24 in ares_waitperform () from /usr/lib/libcurl.so.4
#5 0xb7ccdd8f in Curl_is_resolved () from /usr/lib/libcurl.so.4
#6 0xb7cc9a45 in multi_runsingle () from /usr/lib/libcurl.so.4
#7 0xb7cca112 in curl_multi_perform () from /usr/lib/libcurl.so.4
#8 0x0824b559 in ?? ()
#9 0x0816fc51 in ?? ()
#10 0x08172671 in ?? ()
#11 0x081496b5 in ?? ()
#12 0xb7a3d925 in __libc_start_main () from /lib/libc.so.6
#13 0x0804f5e1 in std::ios_base::Init::~Init ()