Bug#904998: libstdc++6: libtsdc++ with g++-8 hangs in std::local_Rb_tree_decrement

[Alastair McKinstry <mckinstry@debian.org>]

On 02/08/2018 01:22, Matthias Klose wrote:
> On 30.07.2018 12:26, Alastair McKinstry wrote:
> > Package: libstdc++6
> > Version: 8.2.0-1
> > Severity: important
> >
> > With a program I'm working on, its run
> > $ mpiexec -n 1 ./bin/server.exe : -n 1 ./bin/client.exe
> >
> > both programs hang, with:
> >
> > #0  std::local_Rb_tree_decrement (__x=0x55f54daac538) at ../../../../../src/libstdc++-v3/src/c++98/tree.cc:99
> > #1  0x000055f54d04eba8 in xios::CReorderDomain::registerTrans() ()
> > #2  0x000055f54cf5953f in _GLOBAL__sub_I__ZN4xios14CReorderDomainC2Ev ()
> >
> > The MPI nature of the code should be irrelevant (they're independent processes, not interacting at this point but running the same piece of code)
> > This code works with  g++ 7.3, but fails with 8.1/ 8.2
> there are no changes in this area, afaics.  Does openmpi already build with
> C++11?  But maybe not all it's reverse dependencies.
Yes, I don't understand it.
The program (XIOS, open source but not packaged in Debian) compiles fine 
under both g++ 7.3  and 8.1, but hangs when the 8.* version is run.
(The libstdc++ is the same in both cases). No (new or relevant) warnings 
are given when compiling; the 7.3 code works ok against the 8.* version
of libstdc++.
No -stdc= flags are used; just -g -O2 / -O3 -D__NONE__
(I don't know why __NONE__ is defined; it might be a boost/blitz thing 
as these are included).

--
Alastair McKinstry, <alastair@sceal.ie>, <mckinstry@debian.org>, https://diaspora.sceal.ie/u/amckinstry
Misentropy: doubting that the Universe is becoming more disordered.