I do not know why this occurs but it only seems to occur for libstdc++
std::ostream code. I have had SEGFAULTs with std::cerr but not std::clog when
simply outputting errors but tried to ignore it... until I found a different
problem. I was getting SIGABRTs from a free() assert within libc when using
std::ostringstream for simple stream operators building from static 'char const
* const' like:
std::ostringstream s;
s << "bad";
I don't have a simple test to replicate this unfortunately, but I do have an
example crash dump. I was using the linker -rpath to always tie the executable
and the shared library to the gcc dependencies. I have no problems with my
setup when I remove the dlopen RTLD_DEEPBIND option when loading my shared
library that includes the std::ostream usage (like that which I described for
std::ostringstream). This particular problem is a "heisenbug" because it only
appears when I turn optimization on for the shared library (-O1 was enough to
make it crash). The example crash dump is below:
#0 0x00002b92e27af015 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) back
#0 0x00002b92e27af015 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00002b92e27b0b83 in *__GI_abort () at abort.c:88
#2 0x00002b92e27f00c8 in __libc_message (do_abort=2,
fmt=0x2b92e28b8dd0 "*** glibc detected *** %s: %s: 0x%s ***\n")
at ../sysdeps/unix/sysv/linux/libc_fatal.c:170
#3 0x00002b92e27f5a58 in malloc_printerr (action=2,
str=0x2b92e28b63a9 "free(): invalid pointer", ptr=<value optimized out>)
at malloc.c:5949
#4 0x00002b92e27f80a6 in *__GI___libc_free (mem=0x2b92e28aef40)
at malloc.c:3625
#5 0x00002b92e228b0d8 in std::basic_stringbuf<char, std::char_traits<char>,
std::allocator<char> >::overflow (this=0x40a87948, __c=<value optimized out>)
at
/.../src/lib/g++/releases/gcc-4.4.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.h:231
#6 0x00002b92e228eee5 in std::basic_streambuf<char, std::char_traits<char>
>::xsputn (this=0x40a87948,
__s=0xeea868
"01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567
", __n=98)
at
/.../src/lib/g++/releases/gcc-4.4.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/streambuf.tcc:97
#7 0x00002b92e22871d5 in std::__ostream_insert<char, std::char_traits<char> >
(__o...@0x40a87940, __s=<value optimized out>, __n=98)
at
/.../src/lib/g++/releases/gcc-4.4.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/streambuf:427
#8 0x00002aaaaaab1998 in random_task (st...@0xeaf7a2,
variable0=<value optimized out>,
variable1=<value optimized out>,
variable2=<value optimized out>,
variable3=<value optimized out>,
variable4=<value optimized out>, variable5=0,
variable6=0, variable7=0, variable8=0,
variable9=0, variable10=0, variable11=0,
variable12=0, stre...@0x40a87cf0)
at
/.../install/g++/releases/gcc-4.4.2_install/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.4.2/../../../../include/c++/4.4.2/bits/basic_string.h:2506
#9 0x00002aaaaaabd543 in do_work (stop=<value optimized out>, id=0,
taskda...@0xe9d8a0, taskDataSize=88, querieso...@0x40a87f70)
at lib/cloud_job_all_patterns/src/cloud_job_random_task.cpp:106
#10 0x000000000041320d in
WorkerController::WorkerExecution::ThreadPool::ThreadFunctionObject::operator()
(this=0x40a88030, stopp...@0xeaf7a2,
allocator=<value optimized out>)
at lib/cloud_worker/src/worker_execution.cpp:501
warning: (Internal error: pc 0x418d35 in read in psymtab, but not in symtab.)
warning: (Internal error: pc 0x418d35 in read in psymtab, but not in symtab.)
#11 0x0000000000418d36 in
boost::detail::thread_data<WorkerController::WorkerExecution::ThreadPool::ThreadObject>::run
(this=<value optimized out>)
at lib/cloud_worker/src/worker_execution.cpp:236
warning: (Internal error: pc 0x418d35 in read in psymtab, but not in symtab.)
warning: (Internal error: pc 0x418c80 in read in psymtab, but not in symtab.)
#12 0x00002b92e15ae350 in thread_proxy ()
from
/.../src/lib/boost/releases/boost_1_40_0_install/lib/libboost_thread.so.1.40.0
#13 0x00002b92e2d0c3ea in start_thread (arg=<value optimized out>)
at pthread_create.c:297
#14 0x00002b92e2862cbd in clone () from /usr/lib/debug/libc.so.6
#15 0x0000000000000000 in ?? ()
libc gives its own little backtrace:
*** glibc detected *** _release/lib/cloud-0.0.8/priv/cloud_worker_port: free():
invalid pointer: 0x00002b92e24e50a0 ***
======= Backtrace: =========
/usr/lib/debug/libc.so.6[0x2b92e27f5a58]
/usr/lib/debug/libc.so.6(cfree+0x76)[0x2b92e27f80a6]
/.../src/lib/g++/releases/gcc-4.4.2_install/lib64/libstdc++.so.6(_ZNSt15basic_stringbufIcSt11char_traitsIcESaIcEE8overflowEi+0x168)[0x2b92e228b0d8]
/.../src/lib/g++/releases/gcc-4.4.2_install/lib64/libstdc++.so.6(_ZNSt15basic_streambufIcSt11char_traitsIcEE6xsputnEPKcl+0x35)[0x2b92e228eee5]
_release/lib/cloud-0.0.8/priv/work_types/libcloud_job_random_task.so(_Z21random_taskRKbP7pg_connRKSsS4_jjjjjjjjjjRSo+0x229)[0x2aaaaaab1998]
_release/lib/cloud-0.0.8/priv/work_types/libcloud_job_random_task.so(do_work+0x74a)[0x2aaaaaabd543]
release/lib/cloud-0.0.8/priv/cloud_worker_port[0x41320d]
You could probably replicate my scenario with the code I am using, but the
setup would be a pain (code is at
http://sourceforge.net/projects/cloudi/files/0.0.8a/cloudi-0.0.8.tar.gz/download)
Why won't std::ostream classes play well with when loaded into an executable
with RTLD_DEEPBIND? Isn't this some sort of design problem within the
std::ostream code?
--
Summary: RTLD_DEEPBIND dlopen option for shared library that uses
libstdc++ std::ostream crashes
Product: gcc
Version: 4.4.2
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mjtruog at fastmail dot ca
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42679
