libstdc++/5166: Segfault when using global std::string from dlopen
Christoph Bugel
chris@tti-telecom.com
Thu Dec 20 10:04:00 GMT 2001
>Number: 5166
>Category: libstdc++
>Synopsis: Segfault when using global std::string from dlopen
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Dec 20 08:36:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Christoph Bugel <chris@tti-telecom.com>
>Release: 3.0.2
>Organization:
>Environment:
System: HP-UX unknown B.11.00 U 9000/800 1111971557 unlimited-user license
host: hppa2.0w-hp-hpux11.00
build: hppa2.0w-hp-hpux11.00
target: hppa2.0w-hp-hpux11.00
configured with: /test/gcc-3.0.2/configure --prefix=/users/chris/gccbig/install-test3 --with-gnu-as --with-as=/test/gnu/bin/as --enable-languages=c++ --enable-threads=posix
>Description:
Segmentation violation when a function in a dll writes to a global std::string in the same dll. This happens only when the dll is loaded with dlopen; dynamic linking of the same dll works fine. Also, if the string is local to the function, it works fine too.
Note 1: Compiling with -Wall will produce "aggregate has a partly bracketed initializer" warnings similar to PR 3195 and PR 4594. pasted below. Seems to be related to threads.
Note 2: Configuring with --enable-threads was not good enough, I needed to explicitly supply =posix, and now even hello world requires -lpthread to link.
Note 3: I also tried using shl_load instead of dlopen: same problem.
Simple reproducing code (main.cc, mydll.cc) is attached.
gdb output and g++ warnings are pasted below:
$ gdb main core
HP gdb 2.1
Copyright 1986 - 1999 Free Software Foundation, Inc.
Hewlett-Packard Wildebeest 2.1 (based on GDB 5.0-hpwdb-20000630)
Wildebeest is free software, covered by the GNU General Public License, and
you are welcome to change it and/or distribute copies of it under certain
conditions. Type "show copying" to see the conditions. There is
absolutely no warranty for Wildebeest. Type "show warranty" for details.
Wildebeest was built for PA-RISC 1.1 or 2.0 (narrow), HP-UX 11.00.
..
Core was generated by `main'.
Program terminated with signal 11, Segmentation fault.
warning: The shared libraries were not privately mapped; setting a
breakpoint in a shared library will not work until you rerun the program.
#0 0xc0970940 in _ZNKSs4sizeEv (this=0xfffffff4)
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:397
397 size() const { return _M_rep()->_M_length; }
(gdb) bt
#0 0xc0970940 in _ZNKSs4sizeEv (this=0xfffffff4)
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:397
#1 0xc096d3e4 in _ZNKSs7_M_iendEv (this=0x7f7b2438)
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:254
#2 0xc096c920 in _ZNSs6assignIPKcEERSsT_S3_ (this=0x7f7b2438, __first=0x7f7b2444 "",
__last=0x7f7b2444 "")
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:511
#3 0xc096be30 in _ZNSs6assignEPKc (this=0x7f7b2438, __s=0x7f7b2444 "")
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:502
#4 0xc096b12c in _ZNSsaSEPKc (this=0xfffffff4, __s=0x0)
at /users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:350
#5 0xc096a810 in func () at mydll.cc:10
#6 0x4180 in main () at main.cc:20
g++ -fPIC -Wall -g -c mydll.cc -o mydll.o
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h: In instantiation of `std::_STL_mutex_lock std::__default_alloc_template<true, 0>::_S_node_allocator_lock':
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:316: instantiated from `std::__default_alloc_template<threads, inst>::_Lock::_Lock() [with bool threads = true, int inst = 0]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:365: instantiated from `static void std::__default_alloc_template<threads, inst>::deallocate(void*, long unsigned int) [with bool threads = true, int inst = 0]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:588: instantiated from `void std::allocator<_Alloc>::deallocate(_Tp*, long unsigned int) [with _Tp = char]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.tcc:256: instantiated from `void std::basic_string<_CharT, _Traits, _Alloc>::_Rep::_M_destroy(const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:180: instantiated from `void std::basic_string<_CharT, _Traits, _Alloc>::_Rep::_M_dispose(const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/basic_string.h:344: instantiated from `void std::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/locale_facets.tcc:172: instantiated from `void std::_Format_cache<_CharT>::_M_populate(std::ios_base&) [with _CharT = char]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/locale_facets.tcc:226: instantiated from `static std::_Format_cache<_CharT>* std::_Format_cache<_CharT>::_S_get(std::ios_base&) [with _CharT = char]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/ostream.tcc:490: instantiated from `void std::__pad_char(std::basic_ios<_CharT, _Traits>&, _CharT*, const _CharT*, long int, long int) [with _CharT = char, _Traits = std::char_traits<char>]'
/users/chris/gccbig/install-test3/include/g++-v3/bits/ostream.tcc:701: instantiated from `std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*) [with _Traits = std::char_traits<char>]'
mydll.cc:9: instantiated from here
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
/users/chris/gccbig/install-test3/include/g++-v3/bits/stl_alloc.h:523: warning: aggregate
has a partly bracketed initializer
>How-To-Repeat:
compile the attached code; main will segfault.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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