[Tcl-bugs] [ tktoolkit-Bugs-2310660 ] Tk tests produce FMR in Purify on Linux

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Bugs item #2310660, was opened at 2008-11-18 18:47
Message generated for change (Comment added) made by dkf
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Category: 69. Events
Group: obsolete: 8.4.13
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Michael Smith (mtsmith)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: Tk tests produce FMR in Purify on Linux

Initial Comment:
Parts of the Tk test suite from release 8.4.13 produces an Free Memory Read (FMR) when run with Purify. The specific tests are event-double-click-drag-1.1, textTag-15.2, and textTag-15.3. I've included a minimal test case derived from those tests that demonstrates the problem, and the log file from running with Purify.

I ran this test on Redhat Enterprise Linux 4.0 U6, using gcc 4.2.2. I built Tcl 8.4.13 from source with a shared library, then built Tk 8.4.13 from source with a shared library and based off the Tcl I'd built. Then I rebuilt wish8.4 with IBM Rational Purify 7.0.0.0-008.P and ran the attached test file.

Notes from my own debugging: the FMR occurs in SortTags called from line 1355 in tkTextTag.c, happens whether the fast sort or qsort is used, seems to happen on a tag named "sel" (the other members are "x" and "y"), happens on the 2nd call when SortTags is called twice in a row with the same tagArrayPtr pointer (first time in the entire Tk test suite that happens).

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>Comment By: Donal K. Fellows (dkf)
Date: 2008-11-18 21:34

Message:
That's a release that's 2.5 years old from a branch that's now EOL'ed. Care
to test with something more recent? (Even 8.4.19 would be more sensible,
though 8.5.5 would be more helpful; the text widget has had quite a lot of
revisions in the 8.5 series, so bug reports *can't* be directly compared.)

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