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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=235666
Summary: Segfault occurs when using Perl-Tk on FC6 Product: Fedora Extras Version: fc6 Platform: All OS/Version: Linux Status: NEW Severity: medium Priority: medium Component: perl-Tk AssignedTo: andreas.bierfert@lowlatency.de ReportedBy: daniel.frerejacque@normalesup.org QAContact: extras-qa@fedoraproject.org CC: fedora-perl-devel-list@redhat.com
Description of problem:
Version-Release number of selected component (if applicable): Perl-Tk loaded on 2007 April, 8th (Tk807.02?-10) An old proved perl program get segfaults
How reproducible: Always. Attached is small file with an unfolded loop asking of yes_no question. It has been extracted from a program doing a cycle edition -> latex -> viewing (here ask repeat or goto print)
Steps to Reproduce: 1.Use the file attached: 2.After three choices, you got a segfault on my machine. FC6 3.
Actual results:
Expected results: NO SEGFAULT
Additional info: The program worked fine since FC3
------- Additional Comments From daniel.frerejacque@normalesup.org 2007-04-09 09:35 EST ------- Created an attachment (id=151990) --> (https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=151990&action=vie...) a small perl program using Tk
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
bugzilla@redhat.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Product|Fedora Extras |Fedora Version|fc6 |6
andreas.bierfert@lowlatency.de changed:
What |Removed |Added ---------------------------------------------------------------------------- Version|6 |8
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-02 20:34 EST ------- perl-Tk-804.028-1.fc8 has been pushed to the Fedora 8 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update perl-Tk'
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-02 20:35 EST ------- perl-Tk-804.028-1.fc7 has been pushed to the Fedora 7 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update perl-Tk'
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
michal@harddata.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |michal@harddata.com
------- Additional Comments From michal@harddata.com 2008-01-03 19:31 EST ------- Hm, after an update to perl-Tk-804.028-1.fc7 and adding in 'testask' test program from comment #1 eight more lines
$action = yes_no($f); print $action,"\n";
I got the following results:
$ perl testask 0 0 0 0 Segmentation fault $ perl testask 1 1 1 1 1 1 1 1 1 Segmentation fault $ perl testask 0 0 0 0 0 0 Segmentation fault
That is not precisely repeatable. It appears that one has to click fast enough in a succession to segfault (so with a random placement of new windows this is hard to achieve). As you can see a number of tries also changes and I got also "clean" series.
OTOH I tried to reproduce that with perl-Tk-804.028-1.fc9 on a "rawhide" test installation and this was much harder. On a number of tries I got a segfault once on 17th answer (after a number of "action lines" was increased once again).
Both F7 and rawhide installation are on x86_64 hardware but different machines.
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From michal@harddata.com 2008-01-04 17:05 EST ------- With perl-Tk-debuginfo loaded I managed to get a core and a backtrace. It looks like follows for perl-Tk-804.028-1:
Core was generated by `perl testask'. Program terminated with signal 11, Segmentation fault. #0 0x00002aaaaeff0ba6 in Tk_GetOptionValue (interp=0xb57b40, recordPtr=0xb0f820 " W�", optionTable=<value optimized out>, namePtr=<value optimized out>, tkwin=0xb35720) at tkConfig.c:2280 2280 if (optionPtr->specPtr->type == TK_OPTION_SYNONYM) { (gdb) where #0 0x00002aaaaeff0ba6 in Tk_GetOptionValue (interp=0xb57b40, recordPtr=0xb0f820 " W�", optionTable=<value optimized out>, namePtr=<value optimized out>, tkwin=0xb35720) at tkConfig.c:2280 #1 0x00002aaaaefa9f69 in FrameWidgetObjCmd (clientData=0xb0f820, interp=0xb57b40, objc=3, objv=0x7c5638) at tkFrame.c:772 #2 0x00002aaaaef8119b in Call_Tk (info=<value optimized out>, items=3, args=0x7c5638) at tkGlue.c:2283 #3 0x00002aaaaef826c0 in XStoWidget (my_perl=0x604010, cv=<value optimized out>) at tkGlue.c:2664 #4 0x0000003dd6490826 in Perl_pp_entersub () from /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so #5 0x0000003dd648a0ee in Perl_runops_standard () from /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so #6 0x0000003dd6437d9c in perl_run () from /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so #7 0x00000000004017bc in main ()
In frame 0 optionPtr->specPtr comes as (const Tk_OptionSpec *) 0x0 so it is not that surprising that an attempt to derefernce it segfaults. The whole *optionPtr looks like this:
{specPtr = 0x0, dbNameUID = 0x31 <Address 0x31 out of bounds>, dbClassUID = 0xffffffffffff3fff <Address 0xffffffffffff3fff out of bounds>, defaultPtr = 0x3fffffffffff, extra = {monoColorPtr = 0x0, synonymPtr = 0x0, custom = 0x0}, flags = 0}
Is this value legitimate or this is a symptom of a "generic trouble" in a perl mulithreading support?
Replacing on line 2277 'if (optionPtr == NULL)' with 'if (optionPtr == NULL || optionPtr->specPtr == NULL )' should prevent that segfault but I have no idea if this just papers over symptomps and/or has other nasty side-effects.
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From andreas.bierfert@lowlatency.de 2008-01-04 17:27 EST ------- I have been debugging this the whole evening and on the way adding sort of the same patch. This does prevent it from crashing in a couple of occasions but so harder you can still trigger a crash because eventually optionPtr->specPtr->type is broken (or better specPtr contains crap).
I currently believe that this is related to what is mentioned in tkGlue.c:2269:
" /* BEWARE if Tk code does a callback to perl and perl grows the stack then args that Tk code has will still point at old stack. Thus if Tk tests args[i] *after* the callback it will get junk. (Note it is only vector that is at risk, SVs themselves will stay put.)
So we pre-emptively swap perl stack so any callbacks which grow their stack don't move our "args" */ " because there stuff gets called but values for args make sense: e.g. right before a crash: args: 0x7c59c8, args[2]: 0x96D010
I am really clueless atm.
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From andreas.bierfert@lowlatency.de 2008-01-04 18:53 EST ------- I have located the issue and worked around it. Please give it a try. Builds can be found in koji but should also hit updates-testing with the next push.
rawhide -> http://koji.fedoraproject.org/koji/buildinfo?buildID=30137 f8 -> http://koji.fedoraproject.org/koji/buildinfo?buildID=30136 f7 -> http://koji.fedoraproject.org/koji/buildinfo?buildID=30138
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From michal@harddata.com 2008-01-04 21:47 EST -------
I have located the issue and worked around it. Please give it a try
If not anything else you surely made triggering the issue much harder. :-) I tried a number of times and failed while previously I could get that segfault with a relative ease. Not entirely surprising looking at your patch.
I also run few other tests and they seem to be doing fine. In particular those from 'demos' subdirectory of sources.
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-06 20:17 EST ------- perl-Tk-804.028-1.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-06 20:20 EST ------- perl-Tk-804.028-2.fc7 has been pushed to the Fedora 7 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update perl-Tk'
Please do not reply directly to this email. All additional comments should be made in the comments box of this bug report.
Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-06 20:29 EST ------- perl-Tk-804.028-1.fc8 has been pushed to the Fedora 8 stable repository. If problems still persist, please make note of it in this bug report.
Please do not reply directly to this email. All additional comments should be made in the comments box of this bug report.
Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
updates@fedoraproject.org changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |CLOSED Resolution| |ERRATA Fixed In Version| |804.028-1.fc8
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Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-06 20:29 EST ------- perl-Tk-804.028-2.fc8 has been pushed to the Fedora 8 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update perl-Tk'
Please do not reply directly to this email. All additional comments should be made in the comments box of this bug report.
Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-11 17:15 EST ------- perl-Tk-804.028-2.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.
Please do not reply directly to this email. All additional comments should be made in the comments box of this bug report.
Summary: Segfault occurs when using Perl-Tk on FC6
https://bugzilla.redhat.com/show_bug.cgi?id=235666
------- Additional Comments From updates@fedoraproject.org 2008-01-11 17:18 EST ------- perl-Tk-804.028-2.fc8 has been pushed to the Fedora 8 stable repository. If problems still persist, please make note of it in this bug report.
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