[Boost-users] Seg faults when using boost::regex_replace in multiple threads

10 Jul 2006

      Hello,

I'm having a few problems with boost::regex_replace seg faulting when used
in a multithreaded program. The problem seems to be identical to the one
described in http://lists.boost.org/boost-users/2006/06/20235.php, with a
seg fault on line 133 of regex_format.hpp, though I have linked against the
multithreaded version of libboost_regex.so and the problem is still
happening. Unfortunately, I never saw any definitive answer for what was
causing the original poster's problems. 

===========================================

Stack trace:

===========================================

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread -584664144 (LWP 28385)] 0x080520e0 in
boost::re_detail::basic_regex_formatterstd::string, boost::match_results > >,
boost::regex_traits_wrapper > >::format_all (this=0xdd26b8d0) at

regex_format.hpp:133

133           switch(*m_position)

(gdb) where

#0  0x080520e0 in

boost::re_detail::basic_regex_formatterstd::string, boost::match_results > >,
boost::regex_traits_wrapper > >::format_all (this=0xdd26b8d0) at

regex_format.hpp:133

#1  0x080518be in

boost::re_detail::basic_regex_formatterstd::string, boost::match_results > >,
boost::regex_traits_wrapper > >::format (this=0xdd26b8d0, p1=0xd55005dc
"$1", p2=0xd55005de "",

    f=format_all) at regex_format.hpp:123

#2  0x08051073 in

boost::re_detail::regex_format_impstd::string, char const*, std::allocator
...
, char, boost::regex_traits_wrapper
boost::cpp_regex_traits<char> > > > (out=

      {> =
{<No data fields>}, out = 0xdd26ba70}, m=@0xd5500518, p1=0xd55005dc "$1",
p2=0xd55005de "",

    flags=format_all, t=@0x8064140) at regex_format.hpp:569

#3  0x08050710 in

format >, boost::basic_regex > >
(this=0xd5500518, out={> = {<No data fields>}, out = 0xdd26ba70},

    fmt=@0xdd26b990, flags=format_all, re=@0x805f6ec) at
match_results.hpp:170

#4  0x0804fe35 in

boost::regex_replacestd::string,

char const*, boost::regex_traits,

char> (out=

      {> =
{<No data fields>}, out = 0xdd26ba70}, first=0xd550048c "abcdefgh",
last=0xd5500494 "", e=@0x805f6ec,

    fmt=0x805a2a9 "$1", flags=format_all) at regex_replace.hpp:53

#5  0x0804f7e1 in boost::regex_replace, char> (s=@0xdd26ba80, e=@0x805f6ec,

fmt=0x805a2a9 "$1", flags=format_all)

    at regex_replace.hpp:84

#6  0x0804f3c4 in test_fn () at regexTest.C:32

#7  0xf63e5dec in start_thread () from /lib/tls/libpthread.so.0

#8  0xf6385a2a in clone () from /lib/tls/libc.so.6

(gdb) print *this

$1 = {m_traits = @0x8064140, m_results = @0xd5500518, m_out =
{> = {<No
data fields>}, out = 0xdd26ba70},

  m_position = 0xd44ff5d6 
, m_end =
0xd55005de "", m_flags = format_all, m_state = output_copy,
m_have_conditional = false}

==========================================

GCC version is 3.2.3 20030502 (Red Hat Linux 3.2.3-42), with Boost 1.33.1,
on a 4 CPU machine.

We're using the STL from RogueWave, though since the post from a couple of
weeks ago had the same problem with both GCC and STLport libraries I don't
think that's the problem. This problem also occurs with version 1.33.0, but
not with 1.32 or earlier. 

Does anyone know if there is a known problem with using these new versions
of boost::regex_replace in multiple threads? If it's helpful, I have a very
simple test program that demonstrates the problem. Any help on this would be
greatly appreciated.

Kind regards,

Alistair Potts

[Boost-users] Seg faults when using boost::regex_replace in multiple threads

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