Bugs item #2071932, was opened at 2008-08-24 17:53
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Category: libcurl
Group: crash
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Ol L (oliverjl)
Assigned to: Daniel Stenberg (bagder)
Summary: rtorrent/libcurl segfaults intermittently

Initial Comment:
rtorrent (both stable and latest svn) using libcurl (again, I've tried fedora 9 stable packages, self-compiled stable version and self-compiled cvs version) crashes on average every 4 hours or so. Backtraces from the crashes show that the crash is inside libcurl, generally curl_multi_perform().

The relevant rtorrent bug report is at http://libtorrent.rakshasa.no/ticket/1419 , several backtraces are available there.
My most recent backtrace is included here. This was obtained with rtorrent svn and libcurl cvs. Please advise which version of libcurl it would be most useful to you for this to be tested with.

$ curl -V
curl 7.19.0-CVS (x86_64-unknown-linux-gnu) libcurl/7.19.0-CVS OpenSSL/0.9.8g zlib/1.2.3 libidn/0.6.14
Protocols: tftp ftp telnet dict ldap http file https ftps
Features: Debug IDN IPv6 Largefile NTLM SSL libz

$ uname -a
Linux elepaio 2.6.26.1-9.fc9.x86_64 #1 SMP Tue Aug 5 22:39:01 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux

$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-cpu=generic --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.3.0 20080428 (Red Hat 4.3.0-8) (GCC)

Backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x000000000013cfb0 in Curl_do (connp=0x3c6a220, done=0x7fffe419fa9c) at url.c:4726
4726 if(conn->handler->do_it) {
Current language: auto; currently c
Missing separate debuginfos, use: debuginfo-install keyutils.x86_64
(gdb) bt full
#0 0x000000000013cfb0 in Curl_do (connp=0x3c6a220, done=0x7fffe419fa9c) at url.c:4726
        result = CURLE_OK
        conn = (struct connectdata *) 0x4943738
        data = (struct SessionHandle *) 0x4b9b178
#1 0x0000000000152586 in multi_runsingle (multi=0x1613728, easy=0x3c6a208) at multi.c:1117
        disconnect_conn = false
        msg = (struct Curl_message *) 0x0
        connected = false
        async = false
        protocol_connect = false
        dophase_done = false
        done = false
        result = CURLM_OK
        k = (struct SingleRequest *) 0x4b90c10
#2 0x0000000000152eed in curl_multi_perform (multi_handle=0x1613728, running_handles=0x7fffe419fc58) at multi.c:1475
        result = CURLM_OK
        multi = (struct Curl_multi *) 0x1613728
        easy = (struct Curl_one_easy *) 0x3c6a208
        returncode = CURLM_OK
        t = (struct Curl_tree *) 0x4a13f30
#3 0x00000000004770d5 in core::CurlStack::perform (this=0x1613410) at curl_stack.cc:74
        count = -716090
        code = CURLM_CALL_MULTI_PERFORM
#4 0x0000000000470d4d in core::PollManagerEPoll::poll (this=0x1613400, timeout={m_time = 1000}) at poll_manager_epoll.cc:92
        t = {tv_sec = 0, tv_usec = 1000}
#5 0x00000000004323af in main (argc=<value optimized out>, argv=0x7fffe419ff08) at main.cc:276
        firstArg = <value optimized out>
        e = <value optimized out>

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Received on 2008-08-24