-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi Rony,
it is not possible to answer your question from the stack trane you posted. First, install the debug symbols for libc and libdbus, so you can see in what function the problem occurred. If you're using Debian or some derivate, install libc6-dev and libdbus-1-dev, I think those should contain the debug symbols. Then allow core dumps to be written, that allows to examine the memory that cause the problem. Do this with ulimit -c 1000000 This will set the maximum core size file to one megabyte. Depending on how complex your program is, it may be required to increase the value. The ulimit setting only has effect for program started from the same parent process, i.e. the same shell. As you seem to be running rexx from the system and not a development build, you can examine the core using gdb: gdb core Using the gdb's command backtrace (bt), you can inspect the call stack and using print you can loot at the variables - if they're not optimized away. Another question - are you running Rexx inside a Rexx thread or an externally created thread? It seems like a multi-threading issue cause two frees of one memory area. Did you check you're following the locking prerequisites of libdbus? I how I did not repeat things you already know - but from your information it's really hard to guess what the problem is! Kind regards, Moritz On 08/08/2011 10:56 PM, Rony G. Flatscher wrote: > Hi there, > > While stress-testing a part of the dbus language binding in an area > (private DBUS server) there is a chance that I hit problems in > libdbus.so itself in that area (as some comments indicate that > multi-threading in the server may need more testing). > > Now from time to time I would get segmentation faults, but rarely > traces. Now I got a backtrace, but am not really able to read/determine > whether the culprit is likely to be libdbus.so (the dbus reference > library implementation), my language binding or ooRexx or glibc. > > *** glibc detected *** /usr/bin/rexx: double free or corruption > (fasttop): 0x0000000000da8980 *** > ======= Backtrace: ========= > /lib/x86_64-linux-gnu/libc.so.6(+0x78a8f)[0x7f92a0eefa8f] > /lib/x86_64-linux-gnu/libc.so.6(+0x7b1bb)[0x7f92a0ef21bb] > /lib/x86_64-linux-gnu/libc.so.6(realloc+0xf9)[0x7f92a0ef3b19] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x28321)[0x7f929e7f1321] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x28a98)[0x7f929e7f1a98] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x14217)[0x7f929e7dd217] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x14c18)[0x7f929e7ddc18] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x14f46)[0x7f929e7ddf46] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x1295f)[0x7f929e7db95f] > /lib/x86_64-linux-gnu/libdbus-1.so.3(+0x12e35)[0x7f929e7dbe35] > > /lib/x86_64-linux-gnu/libdbus-1.so.3(dbus_message_new_method_call+0xfc)[0x7f929e7e0a4c] > /usr/lib/libdbusoorexx.so(DbusBusCallMessage_impl+0x5d0)[0x7f929ea1ed49] > /usr/lib/libdbusoorexx.so(DbusBusCallMessage+0x93)[0x7f929ea1e75f] > > /usr/lib/ooRexx/librexx.so.4(_ZN20RexxNativeActivation3runEP10RexxMethodP16RexxNativeMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0xce)[0x7f92a20d91ae] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject22processProtectedMethodEP10RexxStringP10RexxMethodPPS_mR15ProtectedObject+0x7d)[0x7f92a20a3f4d] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x256)[0x7f92a20fed36] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxInstructionReturn7executeEP14RexxActivationP19RexxExpressionStack+0x44)[0x7f92a210cd44] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN8RexxCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x73)[0x7f92a20d5363] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11messageSendEP10RexxStringPPS_mR15ProtectedObject+0xd3)[0x7f92a20a47d3] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x256)[0x7f92a20fed36] > > /usr/lib/ooRexx/librexx.so.4(_ZN25RexxInstructionAssignment7executeEP14RexxActivationP19RexxExpressionStack+0xf8)[0x7f92a2102298] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN8RexxCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x73)[0x7f92a20d5363] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11messageSendEP10RexxStringPPS_mR15ProtectedObject+0xd3)[0x7f92a20a47d3] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11sendMessageEP10RexxStringPPS_m+0x38)[0x7f92a20a5088] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObjectnwEmP9RexxClassPPS_m+0x6f)[0x7f92a20a513f] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject7newRexxEPPS_m+0x17)[0x7f92a20a51b7] > > /usr/lib/ooRexx/librexx.so.4(_ZN7CPPCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x184)[0x7f92a20cc614] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11messageSendEP10RexxStringPPS_mR15ProtectedObject+0xd3)[0x7f92a20a47d3] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x256)[0x7f92a20fed36] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxInstructionReturn7executeEP14RexxActivationP19RexxExpressionStack+0x44)[0x7f92a210cd44] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN8RexxCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x73)[0x7f92a20d5363] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11messageSendEP10RexxStringPPS_mR15ProtectedObject+0xd3)[0x7f92a20a47d3] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x256)[0x7f92a20fed36] > > /usr/lib/ooRexx/librexx.so.4(_ZN25RexxInstructionAssignment7executeEP14RexxActivationP19RexxExpressionStack+0xf8)[0x7f92a2102298] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN8RexxCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x73)[0x7f92a20d5363] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject22processProtectedMethodEP10RexxStringP10RexxMethodPPS_mR15ProtectedObject+0x7d)[0x7f92a20a3f4d] > > /usr/lib/ooRexx/librexx.so.4(_ZN22RexxInstructionMessage7executeEP14RexxActivationP19RexxExpressionStack+0x2fd)[0x7f92a21091fd] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN8RexxCode3runEP12RexxActivityP10RexxMethodP10RexxObjectP10RexxStringPS5_mR15ProtectedObject+0x73)[0x7f92a20d5363] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxMethod3runEP12RexxActivityP10RexxObjectP10RexxStringPS3_mR15ProtectedObject+0x71)[0x7f92a2098361] > > /usr/lib/ooRexx/librexx.so.4(_ZN10RexxObject11messageSendEP10RexxStringPPS_mR15ProtectedObject+0xd3)[0x7f92a20a47d3] > > /usr/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x256)[0x7f92a20fed36] > > /usr/lib/ooRexx/librexx.so.4(_ZN25RexxInstructionAssignment7executeEP14RexxActivationP19RexxExpressionStack+0xf8)[0x7f92a2102298] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation3runEP10RexxObjectP10RexxStringPS1_mP15RexxInstructionR15ProtectedObject+0x11c)[0x7f92a20d1c9c] > > /usr/lib/ooRexx/librexx.so.4(_ZN14RexxActivation8dispatchEv+0x5b)[0x7f92a20d2a4b] > > /usr/lib/ooRexx/librexx.so.4(_ZN12RexxActivity9runThreadEv+0x13e)[0x7f92a20f589e] > /usr/lib/ooRexx/librexx.so.4(_Z9threadFncPv+0x9)[0x7f92a2123999] > /lib/x86_64-linux-gnu/libpthread.so.0(+0x6d8c)[0x7f92a19b2d8c] > /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f92a0f5d04d] > ======= Memory map: ======== > 00400000-00401000 r-xp 00000000 08:01 8398528 > /usr/bin/rexx > 00601000-00602000 rw-p 00001000 08:01 8398528 > /usr/bin/rexx > 00d8e000-00daf000 rw-p 00000000 00:00 0 > [heap] > 7f9298000000-7f9298021000 rw-p 00000000 00:00 0 > 7f9298021000-7f929c000000 ---p 00000000 00:00 0 > 7f929e540000-7f929e541000 ---p 00000000 00:00 0 > 7f929e541000-7f929e5c1000 rw-p 00000000 00:00 0 > 7f929e5c1000-7f929e5c8000 r-xp 00000000 08:01 14421729 > /lib/x86_64-linux-gnu/librt-2.13.soAborted > > rony@rony-linux:/mnt/root_e/rony/dev/dbus20110602/tutorials-dbus/c-api/work/dbusoorexx/tests$ > > > > Any opintions, hints, tips highly appreciated ! > > Regards, > > ---rony > > P.S.: Doing the same stress test with the standard system and session > buses (using the same test programs) has not yielded such an error so far. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iF4EAREIAAYFAk5A1eAACgkQ264ap80Va8fIOQD9FMCDlWeooPP35kBWoMcz9K5Q mCceDGqFl/0YFr1hmkQBAK9WszYBuIuTgB1bIqZJD2WQyemkHZ/xz0Cn4qqzw7zl =xnsy -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. 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