Hello again,
I bring bad news. I am receiving seg faults and bus errors while running XOTcl code. I am running XOTcl 1.5.3 and Tcl 8.4 on both Linux x86 and OS X PPC. I received the errors randomly on both platforms. This started occuring when I reloaded the source code. At first I thought it was related to Tcl packaging, but I mostly removed calls to package require and package forget. Currently I just use source to load most files. I am writing code generation libraries and using Object eval so I may be doing new things with XOTcl. How should I go about debugging these seg faults? Are core dumps useful? I'll try to write a script that reproduces the problem, but I haven't really narrowed the problem down yet.
Any help is much appreciated.
Thanks,
Ben
I bring bad news. I am receiving seg faults and bus errors while running XOTcl code. I am running XOTcl 1.5.3 and Tcl 8.4 on both Linux x86 and OS X PPC. I received the errors randomly on both platforms. This started occuring when I reloaded the source code. At first I thought it was related to Tcl packaging, but I mostly removed calls to package require and package forget. Currently I just use source to load most files. I am writing code generation libraries and using Object eval so I may be doing new things with XOTcl. How should I go about debugging these seg faults? Are core dumps useful? I'll try to write a script that reproduces the problem, but I haven't really narrowed the problem down yet.
Any help is much appreciated.
Thanks,
Ben _______________________________________________
Hello Ben!
I have also very seldom some segmentation faults with Tcl/XOTcl (and many another extensions). I have noticed, that it can occurs when I am debugging and changing code (by using XOTclIDE). So it is similar to your scenario. It can occurs by me when I suspend processing of one method (with tkwait - used internally by debugger) and from another event handler (beginned from Tk -command) I manipulate some objects. The program have problems when I try to fire tkwait variable (resume the debugger). So I suppose you should not reload the package by itself.
The best method to have a bug fix is to write some short script that always reproduces the error. I have not a success to write it yet. Even if I try to reproduce the same debugging session it does not occurs. Because the error is very seldom it is not possible to fix it without this script.
Artur
Hi Ben,
I am not aware of the symptoms, you are describing. we reload scripts frequently espesically in the openacs environment (openacs.org, reloading contents is part of the normal develoment cycle). I use it here as well under linux and OS X.
a few qestions: - are you sure, that you compile and run with the same tcl version? (if you have multiple tcl versions on your system, use --with-tcl during configure; i doubt this is the problem in your case, since you say, it happens on OS X and Linux, but still worth to check). - which Tcl version are you using exactly? - are you using tcl (and xotcl) with theads enabled? - uses the code threads? - uses the code tcl traces? (e.g. via slots through type-checker, initcmd, valuechangecmd)
The biggest help would be to distill a short script that shows the bug. It might also help to determine, where the code exactly dies. Compile tcl and xotcl with -g and run the script under gdb (call "gdb <yourtclsh>" and source the xotcl code; when the code dies, send me the output, and type in "where" and send me this output as well). One might get a hint, what happend.
-gustaf neumann
Ben Thomasson schrieb:
Hello again,
I bring bad news. I am receiving seg faults and bus errors while running XOTcl code. I am running XOTcl 1.5.3 and Tcl 8.4 on both Linux x86 and OS X PPC. I received the errors randomly on both platforms. This started occuring when I reloaded the source code. At first I thought it was related to Tcl packaging, but I mostly removed calls to package require and package forget. Currently I just use source to load most files. I am writing code generation libraries and using Object eval so I may be doing new things with XOTcl. How should I go about debugging these seg faults? Are core dumps useful? I'll try to write a script that reproduces the problem, but I haven't really narrowed the problem down yet.
Any help is much appreciated.
Thanks,
Ben _______________________________________________ Xotcl mailing list Xotcl@alice.wu-wien.ac.at http://alice.wu-wien.ac.at/mailman/listinfo/xotcl
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Artur Trzewik -
Ben Thomasson -
Gustaf Neumann