[cfe-dev] std::use_facet<std::ctype<char>> crashes on linux

[toki loki]

Problems is static constructor of


locale::id ctype<char>::id;


is called after

    install(&make<_VSTD::ctype<char> >((ctype_base::mask*)0, false, 1u));


~"#0  id (this=<optimized out>) at /home/vv/kom/libcxx/include/__locale:131\n"

>~"#1  __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at /home/vv/kom/libcxx/src/locale.cpp:879\n"

>~"#2  0xb7f350bd in _GLOBAL__sub_I_locale.cpp(void) () at /home/vv/kom/libcxx/src/locale.cpp:6144\n"

>~"#3  0x45a7b696 in call_init.part.0 () from /lib/ld-linux.so.2\n"

>~"#4  0x45a7b75b in _dl_init_internal () from /lib/ld-linux.so.2\n"

>~"#5  0x45a6d18f in _dl_start_user () from /lib/ld-linux.so.2\n"


I use Makefile


LIBCXX_INCLUDE = $(HOME)/kom/libcxx/include/
LIBCXX_LIB = $(HOME)/kom/libcxx-build/lib/
LIBCXXABI_LIB = $(HOME)/kom/libcxxabi/lib/

all:
	clang++ -g -O0 -fno-inline -std=c++11 -stdlib=libc++
-I$(LIBCXX_INCLUDE) main.cpp -L$(LIBCXX_LIB) -Wl,-rpath $(LIBCXX_LIB)
-L$(LIBCXXABI_LIB) -Wl,-rpath $(LIBCXXABI_LIB) -lc++abi -pthread

and clang version clang version 3.3



On Mon, Aug 19, 2013 at 6:32 PM, Howard Hinnant <hhinnant at apple.com> wrote:

> On Aug 19, 2013, at 11:10 AM, toki loki <tokiloki7 at gmail.com> wrote:
>
> > Hi,
> >
> > Program
> >
> > #include <locale>
> > int main(int argc, char* argv[]) {
> >     std::locale loc;
> >     std::use_facet<std::ctype<char>>(loc);
> >     return EXIT_SUCCESS;
> > }
> >
> > Crashes with latest libc++ and libc++abi on Linux with backtrace
> >
> >
> > (gdb) bt
> > #0  0xb7fff424 in __kernel_vsyscall ()
> > #1  0x45abdbaf in raise () from /lib/libc.so.6
> > #2  0x45abf503 in abort () from /lib/libc.so.6
> > #3  0xb7fbf43c in abort_message (format=0xb7ff8264 "terminating with %s
> exception of type %s: %s") at ../src/abort_message.cpp:47
> > #4  0xb7fbf5f9 in default_terminate_handler () at
> ../src/cxa_default_handlers.cpp:63
> > #5  0xb7ff4f04 in std::__terminate (func=0xb7fbf4e0
> <default_terminate_handler()>) at ../src/cxa_handlers.cpp:67
> > #6  0xb7ff44e5 in failed_throw (exception_header=<optimized out>) at
> ../src/cxa_exception.cpp:147
> > #7  __cxa_throw (thrown_object=0x804b058, tinfo=0xb7ffce50 <typeinfo for
> std::bad_cast>, dest=0xb7ff8170 <std::bad_cast::~bad_cast()>) at
> ../src/cxa_exception.cpp:242
> > #8  0xb7f14b82 in std::__1::locale::__imp::use_facet (
> >     this=0xb7fb91a0 <std::__1::locale::__imp& std::__1::(anonymous
> namespace)::make<std::__1::locale::__imp, unsigned int>(unsigned
> int)::buf>, id=28)
> >     at /home/vv/kom/libcxx/src/locale.cpp:432
> > #9  0xb7f15486 in std::__1::locale::use_facet (this=0xbfffeca0, x=...)
> at /home/vv/kom/libcxx/src/locale.cpp:574
> > #10 0x0804878e in main (argc=1, argv=0xbfffed54) at main.cpp:4
> >
> >
> > I have found that 'std::ctype<char>::id.__get()' is 28 for me. I have
> constexpr enabled.
> >
> > Thanks.
> >
>
> The only way I know to debug this is to monitor locale::id::__init() in
> locale.cpp.  One needs to find out who is calling it, how often, from
> where, and what the current value of __next_id is, and what __id_ gets set
> to.  I do not have a linux box to debug this with.
>
> The design is that this gets called exactly 28 times with a default
> constructed locale and that id.__get() returns __id_-1:
>
> long
> locale::id::__get()
> {
>     call_once(__flag_, __fake_bind(&locale::id::__init, this));
>     return __id_ - 1;
> }
>
> Furthermore locale::id::__init() is a private function of locale::id and
> is supposed to be only called within locale::id::__get().
>
> One theory is:  call_once isn't working.
>
> Howard
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20130819/c17bd6e7/attachment.html>