Package: gdb
Version: 7.7.1+dfsg-5
Severity: important
Dear Maintainer,
after upgrading to Debian/Stable, serious problems with GDB:
Unable to start with most of the C++11 programs I am working on,
since the debugger crashes right at start.
Could confirm this problem is present on a pristine install of
Debian 8.1, both 64bit and 32bit
I was able to narrow down the problem in one case to a situation,
where a std::function is bound to a lambda, which uses the template
parameter of the enclosing function as argument type. (function / lambda
without this specific twist cause no problems)
See the following demonstration:
----crash_gdb_jessie-2015-08.sh-------------
#/!bin/sh
#
# crash_gdb -- demostrate a Segfault when invoking the debugger
# observed 8/2015 on Debian/Jessie on X86_64
# <d...@ichthyostega.de>
CODE=`mktemp`
cat << __END__ | g++ -x c++ - -o$CODE -std=gnu++11 && echo "compiled
successfully to $CODE"
#include <functional>
#include <iostream>
#include <string>
using std::string;
using std::cout;
using std::endl;
template<class ELM>
inline string
activate (ELM& something)
{
std::function<string(ELM const&)> lambda = [] (ELM const& val)
{
return string(val);
};
return lambda(something);
}
int
main (int, char**)
{
cout << activate ("Data") << endl;
return 0;
}
__END__
$CODE && echo "executed successfully without debugger"
echo -e "now try to crash the debugger...\n\n"
gdb $CODE -ex run -ex quit
if (($?))
then echo -e "\n\n\n\n *** Debugger crashed"
else echo -e "\n\n\n\n +++ Debugger worked, no crash"
fi
-- System Information:
Debian Release: 8.1
APT prefers stable
APT policy: (900, 'stable'), (650, 'stable'), (500, 'stable-updates'), (95,
'testing'), (80, 'unstable'), (50, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages gdb depends on:
ii libc6 2.19-18
ii libexpat1 2.1.0-6+deb8u1
ii liblzma5 5.1.1alpha+20120614-2+b3
ii libncurses5 5.9+20140913-1+b1
ii libpython2.7 2.7.9-2
ii libreadline6 6.3-8+b3
ii libtinfo5 5.9+20140913-1+b1
ii zlib1g 1:1.2.8.dfsg-2+b1
Versions of packages gdb recommends:
pn gdbserver <none>
pn libc-dbg <none>
Versions of packages gdb suggests:
ii gdb-doc 7.7.1+dfsg-2
-- no debconf information
