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From:Manuel Jung Date:January 15 2007 9:19pm
Subject:Some strange problem SegFault at conn_->lock()
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Hi everybody,
Im have a strange problem. My programm is multithreaded and has different
MySQL Connections on a per thread basis. This works very well. But now i
have rewriten a part of my code which affects one of the threads. But it
uses a great part of the well working classes. 
Now i get a Segmentation Fault on executing execute() or store() (i tried
just these two). gdb get me this errormessages:
#0  0x00000000 in ?? ()
#1  0xb7ce1ca8 in mysqlpp::Query::lock (this=0x80b3de4) at query.cpp:137
#2  0xb7ce2ff6 in mysqlpp::Query::store (this=0xb705eeb0, 
    str=0x80b3de4 "��\v\b��\v\b��\v\b") at query.cpp:349
#3  0xb7ce32f0 in mysqlpp::Query::store (this=0xb705eeb0, p=@0x80b3de4)
    at /usr/include/c++/3.3/bits/basic_string.h:355
#4  0x08057cc7 in mysqlpp::Query::store (this=0xb705eeb0)
    at /usr/local/include/mysql++/query.h:309
#5  0x08094391 in shark::DownloadCall (this=0x80bfdc0, Slot=0x80b3814)
    at src/shark.cpp:69
#6  0x080732d3 in swarm::StartSlot (this=0x80bfdc0, Slot=0x80b3814)
    at src/swarm.cpp:107
#7  0x0805b0ea in slots::SetSlots (this=0x80bfdc0, newSlots=1, maxSlots=10)
    at src/slots.cpp:73
#8  0x08082955 in seal::SelfControl (this=0x80bfce0) at src/seal.cpp:78
#9  0x0808842d in boost::_mfi::mf0<void, seal>::operator() (this=0x80b30d8, 
    p=0x80bfce0) at /usr/local/include/boost/bind/mem_fn_template.hpp:45
#10 0x080883ac in operator()<boost::_mfi::mf0<void, seal>,
boost::_bi::list0> (
    this=0x80b30e0, f=@0x80b30d8, a=@0xb705f383)
    at /usr/local/include/boost/bind.hpp:229
#11 0x0808835c in boost::_bi::bind_t<void, boost::_mfi::mf0<void, seal>,
boost::_bi::list1<boost::_bi::value<seal*> > >::operator() (this=0x80b30d8)
    at /usr/local/include/boost/bind/bind_template.hpp:20
---Type <return> to continue, or q <return> to quit---
#12 0x0808830f in
boost::_mfi::mf0<void, seal>, boost::_bi::list1<boost::_bi::value<seal*>
>, void>::invoke (function_obj_ptr=
      {obj_ptr = 0x80b30d8, const_obj_ptr = 0x80b30d8, func_ptr = 0x80b30d8,
data = "�"}) at /usr/local/include/boost/function/function_template.hpp:136
#13 0xb7cb39c9 in boost::function0<void,
std::allocator<boost::function_base> >::operator() ()
from /usr/local/lib/
#14 0xb7cb35fd in boost::thread_group::size ()
   from /usr/local/lib/
#15 0xb7c09504 in start_thread () from /lib/tls/i686/cmov/
#16 0xb7b9d51e in clone () from /lib/tls/i686/cmov/

Even the Query worked in this part of program well.
Has someone a idea what about this problem could be?
All other MySQL parts work well. Im sorry i cannot post some of my code,
this wont help and it is just too big, to help us. if i try connected() on
the connections it tells me it is just fine; no exception were thrown

Thanks for reading and helping
Manuel Jung
Some strange problem SegFault at conn_->lock()Manuel Jung15 Jan
  • Re: Some strange problem SegFault at conn_->lock()Warren Young17 Jan