qbittorrent crashes randomly

Best thing would be to get a good backtrace with gdb.

$ gdb qbittorrent
> run
... wait until it crashes ...
> bt full
.. copy output here ...

Crash seems to be in libtorrent-rasterbar code so I forwarded the bug to its author. I don't know how useful qbittorrent stackstrace will be to him yet.

I may or may not be experiencing the same thing. I wasn't around when this crash happened, but when I flipped on my monitor today (after an evening of download a thing or two), I was presented with the following console output:

*************************************************************
Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
stack trace:
*** glibc detected *** /usr/bin/qbittorrent: malloc(): memory corruption: 0x00007ffa200393b1 ***
======= Backtrace: =========
/lib/libc.so.6[0x7ffa3947efef]
/lib/libc.so.6(__libc_malloc+0x98)[0x7ffa39480828]
/lib/libc.so.6(__backtrace_symbols+0x10f)[0x7ffa394ff81f]
/usr/bin/qbittorrent[0x472f58]
/usr/bin/qbittorrent(_Z14sigsegvHandleri+0x3d)[0x47344d]
/lib/libc.so.6[0x7ffa39437040]
/usr/lib/libstdc++.so.6(__dynamic_cast+0x7a)[0x7ffa39cd921a]
/usr/lib/libtorrent-rasterbar.so.2[0x7ffa3bbb4bf2]
/usr/lib/libtorrent-rasterbar.so.2(_ZN10libtorrent7torrent14on_name_lookupERKN5boost6system10error_codeENS1_4asio2ip23basic_resolver_iteratorINS7_3tcpEEESsNS7_14basic_endpointIS9_EE+0x7a2)[0x7ffa3bb3c932]
/usr/lib/libtorrent-rasterbar.so.2(_ZN5boost4asio6detail13handler_queue15handler_wrapperINS1_7binder2INS_3_bi6bind_tIvNS_4_mfi3mf4IvN10libtorrent7torrentERKNS_6system10error_codeENS0_2ip23basic_resolver_iteratorINSF_3tcpEEESsNSF_14basic_endpointISH_EEEENS5_5list5INS5_5valueINS_10shared_ptrISA_EEEENS_3argILi1EEENSR_ILi2EEENSN_ISsEENSN_ISK_EEEEEESC_SI_EEE7do_callEPNS2_7handlerE+0x4a8)[0x7ffa3bb567f8]
/usr/lib/libtorrent-rasterbar.so.2(_ZN5boost4asio6detail15task_io_serviceINS1_13epoll_reactorILb0EEEE3runERNS_6system10error_codeE+0x37e)[0x7ffa3babfffe]
/usr/lib/libtorrent-rasterbar.so.2(_ZN10libtorrent3aux12session_implclEv+0x79)[0x7ffa3bb00339]
/usr/lib/libboost_thread-mt.so.1.37.0(thread_proxy+0x5f)[0x7ffa38de3f6f]
/lib/libpthread.so.0[0x7ffa3b51e3ba]
/lib/libc.so.6(clone+0x6d)[0x7ffa394e9fcd]
======= Memory map: ========
00400000-0070a000 r-xp 00000000 08:01 1671265 /usr/bin/qbittorrent
00909000-0090a000 r--p 00309000 08:01 1671265 /usr/bin/qbittorrent
0090a000-0090d000 rw-p 0030a000 08:01 1671265 /usr/bin/qbittorrent
0090d000-0090f000 rw-p 0090d000 00:00 0
028c3000-0356a000 rw-p 028c3000 00:00 0 [heap]
7ffa20000000-7ffa204fb000 rw-p 7ffa20000000 00:00 0
7ffa204fb000-7ffa24000000 ---p 7ffa204fb000 00:00 0
7ffa24cfd000-7ffa254fe000 rw-p 7ffa24cfd000 00:00 0
7ffa25c01000-7ffa25c03000 r-xp 00000000 08:01 6455386 /lib/libnss_mdns4.so.2
7ffa25c03000-7ffa25e03000 ---p 00002000 08:01 6455386 /lib/libnss_mdns4.so.2
7ffa25e03000-7ffa25e04000 rw-p 00002000 08:01 6455386 /lib/libnss_mdns4.so.2
7ffa25e04000-7ffa25e64000 rw-s 00000000 00:09 60719164 /SYSV00000000 (deleted)
7ffa25e64000-7ffa25e65000 ---p 7ffa25e64000 00:00 0
7ffa25e65000-7ffa26665000 rw-p 7ffa25e65000 00:00 0
7ffa26665000-7ffa26666000 ---p 7ffa26665000 00:00 0
7ffa26666000-7ffa26e66000 rw-p 7ffa26666000 00:00 0
7ffa26e66000-7ffa26e67000 ---p 7ffa26e66000 00:00 0
7ffa26e67000-7ffa27667000 rw-p 7ffa26e67000 ...

basiphobe > Please file a bug against libtorrent-rasterbar at:
http://code.rasterbar.com/libtorrent/newticket

The crash is not in qBittorrent's code although the exception is caught by qBittorrent. Please provide in the other report your version of libtorrent-rasterbar and this backtrace of course :)

Oh no sorry, it is the same problem so you don't need to file a new report. You can however confirm the problem here:
http://code.rasterbar.com/libtorrent/ticket/497

Done. Thanks, Christophe.

Aaron

*************************************************************
Catching SIGABRT, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
qBittorrent version: v2.8.4
stack trace:
  /lib/x86_64-linux-gnu/libc.so.6 : ()+0x36420 [0x7fa385c43420]
  /lib/x86_64-linux-gnu/libc.so.6 : gsignal()+0x35 [0x7fa385c433a5]
  /lib/x86_64-linux-gnu/libc.so.6 : abort()+0x17b [0x7fa385c46b0b]
  /usr/lib/x86_64-linux-gnu/libstdc++.so.6 : __gnu_cxx::__verbose_terminate_handler()+0x11d [0x7fa386501d7d]
  /usr/lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xb9f26 [0x7fa3864fff26]
  /usr/lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xb9f53 [0x7fa3864fff53]
  /usr/lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xba04e [0x7fa38650004e]
  /usr/lib/libtorrent-rasterbar.so.6 : ()+0xe4888 [0x7fa3883cb888]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::unique_lock<boost::mutex>::lock()+0x74 [0x7fa3883cbde4]
  /usr/lib/libtorrent-rasterbar.so.6 : libtorrent::udp_socket::on_read(boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*, boost::system::error_code const&, unsigned long)+0x52 [0x7fa3884f2a12]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::asio::detail::reactive_socket_recvfrom_op<boost::asio::mutable_buffers_1, boost::asio::ip::basic_endpoint<boost::asio::ip::udp>, boost::_bi::bind_t<void, boost::_mfi::mf3<void, libtorrent::udp_socket, boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*, boost::system::error_code const&, unsigned long>, boost::_bi::list4<boost::_bi::value<libtorrent::udp_socket*>, boost::_bi::value<boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*>, boost::arg<1>, boost::arg<2> > > >::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code, unsigned long)+0x100 [0x7fa3884f66e0]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::asio::detail::task_io_service::run(boost::system::error_code&)+0x422 [0x7fa388407e52]
  /usr/lib/libtorrent-rasterbar.so.6 : libtorrent::aux::session_impl::operator()()+0x51 [0x7fa388480561]
  /usr/lib/libboost_thread.so.1.46.1 : thread_proxy()+0x69 [0x7fa3855e4ba9]
  /lib/x86_64-linux-gnu/libpthread.so.0 : ()+0x7efc [0x7fa3880d1efc]
  /lib/x86_64-linux-gnu/libc.so.6 : clone()+0x6d [0x7fa385cee89d]
Aborted

backtrace
Peer ID: -qB2840-
HTTP user agent is qBittorrent v2.8.4
terminate called after throwing an instance of 'boost::lock_error'
  what(): boost::lock_error

*************************************************************
Catching SIGABRT, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
qBittorrent version: v2.8.4
stack trace:
  [0x839400]
  [0x839416]
  /lib/i386-linux-gnu/libc.so.6 : gsignal()+0x4f [0xb00c8f]
  /lib/i386-linux-gnu/libc.so.6 : abort()+0x175 [0xb042b5]
  /usr/lib/i386-linux-gnu/libstdc++.so.6 : __gnu_cxx::__verbose_terminate_handler()+0x14d [0x6964ed]
  /usr/lib/i386-linux-gnu/libstdc++.so.6 : ()+0xaf283 [0x694283]
  /usr/lib/i386-linux-gnu/libstdc++.so.6 : ()+0xaf2bf [0x6942bf]
  /usr/lib/i386-linux-gnu/libstdc++.so.6 : ()+0xaf40e [0x69440e]
  /usr/lib/libtorrent-rasterbar.so.6 : ()+0xc14cc [0x8fb4cc]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::unique_lock<boost::mutex>::lock()+0x94 [0x8fba94]
  /usr/lib/libtorrent-rasterbar.so.6 : libtorrent::udp_socket::on_read(boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*, boost::system::error_code const&, unsigned int)+0x53 [0xa348a3]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::asio::detail::reactive_socket_recvfrom_op<boost::asio::mutable_buffers_1, boost::asio::ip::basic_endpoint<boost::asio::ip::udp>, boost::_bi::bind_t<void, boost::_mfi::mf3<void, libtorrent::udp_socket, boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*, boost::system::error_code const&, unsigned int>, boost::_bi::list4<boost::_bi::value<libtorrent::udp_socket*>, boost::_bi::value<boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >*>, boost::arg<1>, boost::arg<2> > > >::do_complete(boost::asio::detail::task_io_service*, boost::asio::detail::task_io_service_operation*, boost::system::error_code, unsigned int)+0xdc [0xa3832c]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::asio::detail::task_io_service::run(boost::system::error_code&)+0x417 [0x93ca67]
  /usr/lib/libtorrent-rasterbar.so.6 : libtorrent::aux::session_impl::operator()()+0x5f [0x9ba85f]
  /usr/lib/libtorrent-rasterbar.so.6 : boost::detail::thread_data<boost::reference_wrapper<libtorrent::aux::session_impl> >::run()+0x21 [0x9ca5c1]
  /usr/lib/libboost_thread.so.1.46.1 : thread_proxy()+0x6c [0x5013cc]
  /lib/i386-linux-gnu/libpthread.so.0 : ()+0x6d31 [0x541d31]
  /lib/i386-linux-gnu/libc.so.6 : clone()+0x5e [0xba646e]