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and subject line Bug#185243: libstdc++3-dev: rope segfaults under heavy load
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From: Ian Turner <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: libstdc++3-dev: rope segfaults under heavy load
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Package: libstdc++3-dev
Version: 1:3.0.4-7
Severity: important
Consider the following program:
--- BEGIN ropetest.c ---
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
unsigned int rand(unsigned int max) {
unsigned int rval = (unsigned int)(((double)max)*rand()/(RAND_MAX));
if (rval == max)
return max-1;
}
int main() {
crope r;
char buf[10240];
while (1) {
if (rand(2) && r.size() < 1024*1024) {
r.append(buf, rand(10240));
} else if (r.size() > 10240) {
r.erase(0, rand(10240));
}
}
return 0;
}
--- END ropetest.c ---
It crashes when compiled with g++-3.0 or g++-3.2 (but not on g++ 2.95):
$ g++ ropetest.c -o ropetest-295 -Wall
[ press CTRL-C ]
$ ./ropetest-295
$ g++-3.0 ropetest.c -o ropetest-300 -Wall -g
$ ./ropetest-300
Segmentation fault
$ g++-3.2 ropetest.c -o ropetest-320 -Wall
$ ./ropetest-320
Aborted
$ gdb g++-3.0
GNU gdb 5.3-debian
[ snip ]
(gdb) run
Starting program: ropetest-300
Program received signal SIGSEGV, Segmentation fault.
std::_Refcount_Base::_M_incr() (this=0xef8)
at /usr/include/g++-v3/bits/stl_threads.h:143
143 ++_M_ref_count;
(gdb) bt
#0 std::_Refcount_Base::_M_incr() (this=0xef8)
at /usr/include/g++-v3/bits/stl_threads.h:143
#1 0x0804a6b5 in std::_Rope_RopeRep<char, std::allocator<char>
>::_M_ref_nonnil() (this=0xef4)
at /usr/include/g++-v3/ext/stl_rope.h:514
#2 0x0804bf1e in std::_Rope_RopeSubstring<char, std::allocator<char>
>::_Rope_RopeSubstring(std::_Rope_RopeRep<char, std::allocator<char> >*,
unsigned, unsigned, std::allocator<char>) (this=0x8054828, __b=0xef4, __s=1405,
__l=2943, __a=0xbfffcbc0)
at /usr/include/g++-v3/ext/stl_rope.h:717
#3 0x0804b778 in std::rope<char, std::allocator<char>
>::_S_new_RopeSubstring(std::_Rope_RopeRep<char, std::allocator<char> >*,
unsigned, unsigned, std::allocator<char>) (__b=0xef4, __s=1405, __l=2943,
__a=0xbfffcc30)
at /usr/include/g++-v3/ext/stl_rope.h:1392
#4 0x0804aa50 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x80547ec, __start=1405, __endp1=4348)
at /usr/include/g++-v3/ext/ropeimpl.h:721
#5 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050b68, __start=1405, __endp1=6370)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#6 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050ad8, __start=1405, __endp1=11258)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#7 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050b98, __start=1405, __endp1=14993)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#8 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050bf8, __start=1405, __endp1=24743)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#9 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050c58, __start=1405, __endp1=31252)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#10 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050cb8, __start=1405, __endp1=32702)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#11 0x0804a8b8 in std::rope<char, std::allocator<char>
>::_S_substring(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned) (__base=0x8050d18, __start=1405, __endp1=32868)
at /usr/include/g++-v3/ext/ropeimpl.h:683
#12 0x0804a055 in std::rope<char, std::allocator<char>
>::replace(std::_Rope_RopeRep<char, std::allocator<char> >*, unsigned,
unsigned, std::_Rope_RopeRep<char, std::allocator<char> >*) (__old=0x8050d18,
__pos1=0, __pos2=1405, __r=0x0)
at /usr/include/g++-v3/ext/stl_rope.h:1846
#13 0x08049d7d in std::rope<char, std::allocator<char> >::erase(unsigned,
unsigned) (this=0xbffff9a0, __p=0, __n=1405)
at /usr/include/g++-v3/ext/stl_rope.h:1993
#14 0x08049b81 in main () at ropetest.cc:21
-- System Information
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux crafter 2.4.19 #1 Fri Sep 27 18:25:53 PDT 2002 i686
Locale: LANG=C, LC_CTYPE=C
Versions of packages libstdc++3-dev depends on:
ii g++-3.0 1:3.0.4-7 The GNU C++ compiler.
ii gcc-3.0-base 1:3.0.4-7 The GNU Compiler Collection (base
ii libc6-dev 2.3.1-14 GNU C Library: Development Librari
ii libstdc++3 1:3.0.4-7 The GNU stdc++ library version 3
---------------------------------------
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From: Matthias Klose <[EMAIL PROTECTED]>
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Date: Thu, 17 Apr 2003 21:39:44 +0200
To: Ian Turner <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#185243: libstdc++3-dev: rope segfaults under heavy load
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Ian Turner writes:
> Package: libstdc++3-dev
> Version: 1:3.0.4-7
> Severity: important
closing this report. in unstable, there is no g++-3.0 anymore. The
package will move to testing/sarge soon. And it won't be fixed
upstream.
