Mine

Breakpoint 3, libtorrent::aux::session_impl::start_dht (this=0x8443b88,
    startup_state=@0xbf9efa54) at session_impl.cpp:1509
1509                    mutex_t::scoped_lock l(m_mutex);
(gdb) n
1507            void session_impl::start_dht(entry const& startup_state)
(gdb) n
1509                    mutex_t::scoped_lock l(m_mutex);
(gdb) n
144             return p_ == 0? 0: &this_type::p_;
(gdb) n
1510                    if (m_dht)
(gdb) n
144             return p_ == 0? 0: &this_type::p_;
(gdb) n
1517                            , startup_state);
(gdb) n
64              if(p_ != 0 && add_ref) intrusive_ptr_add_ref(p_);
(gdb) n
158             p_ = rhs.p_;
(gdb) n
159             rhs.p_ = tmp;
(gdb) n
83              if(p_ != 0) intrusive_ptr_release(p_);
(gdb) n
1517                            , startup_state);
(gdb) n
mutex: Argument invalide
qbittorrent: session_impl.cpp:1061: void libtorrent::aux::session_impl::operator()():  l'assertion « false » a échoué.
1518            }
(gdb) n

Program received signal SIGABRT, Aborted.
[Switching to Thread -1233204336 (LWP 7197)]
0xb7f68410 in __kernel_vsyscall ()