[Tcl-bugs] [ tcl-Bugs-453805 ] Segfault in trace.test

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Bugs item #453805, was opened at 2001-08-21 09:12
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Category: 07. Variables
Group: None
Status: Open
Resolution: None
Priority: 7
Submitted By: miguel sofer (msofer)
>Assigned to: miguel sofer (msofer)
Summary: Segfault in trace.test

Initial Comment:
Tcl Version: 8.4a3 (today's HEAD)
OS: linux 2.2.19 (RH 6.2)
Compiler: egcs-2.91.66 (gcc)
Comp flags: default + "-march=pentiumpro"

Description: segfault in trace.test

  ./configure --disable-shared
  make
  make test

All is OK till here,  _but_:

[mig@mini unix]$ ./tcltest ../tests/trace.test  
Segmentation fault (core dumped)
[mig@mini unix]$ ./tcltest ../tests/trace.test -verbose
trace.test:     Total   185     Passed  185     Skipped
0       Failed  0

Categorizing as "tcltest" bug due to the different
behaviour when verbose switch is on; may well be a bug
somewhere else though ...

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>Comment By: Vince Darley (vincentdarley)
Date: 2001-09-06 13:55

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With both debug and release builds and with and without '-
verbose' I can't reproduce this on my Win2000 setup, so I'm 
afraid I'm not going to be able to help.  I really can't 
think what can have changed here.



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Comment By: Don Porter (dgp)
Date: 2001-08-23 09:00

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Patch 402501 is now updated.

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Comment By: Vince Darley (vincentdarley)
Date: 2001-08-23 08:15

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I have to say I have no obvious ideas of how the 8.4 
changes would have affected this at all.  I've never seen 
the problem, but can try to reproduce it.



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Comment By: Don Porter (dgp)
Date: 2001-08-23 06:26

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Does application of Patch 402501 have any
effect on solving this bug?

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Comment By: miguel sofer (msofer)
Date: 2001-08-23 05:44

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Vince: any ideas?

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Comment By: miguel sofer (msofer)
Date: 2001-08-21 11:01

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Doh ... today's head would be 8.4a4, not 8.4a3!

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Comment By: Don Porter (dgp)
Date: 2001-08-21 10:23

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This is very likely related to bug 219393.

I don't see segfaults, but:
trace.test:     Total   185     Passed  185     Skipped
0      
Failed  0
clover:unix: ./tcltest ../tests/trace.test -verbose

==== trace-9.1 be sure variable is unset before trace is
called FAILED
==== Contents of test case:

    catch {unset x}
    set x 33
    set info {}
    trace add variable x unset {traceCheck {uplevel set x}}
    unset x
    set info

---- Result was:
1 {can't read "x": no such variaale}
---- Result should have been (exact matching):
1 {can't read "x": no such variable}
==== trace-9.1 FAILED

trace.test:     Total   185     Passed  184     Skipped
0       Failed  1

Note the memory corruption mangling the error message.

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Comment By: Jeffrey Hobbs (hobbs)
Date: 2001-08-21 09:26

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This is likely due to a bug in the actual trace changes in 
8.4, which should be hunted down.  Assigning back to Miguel 
since he can reproduce this.  Might need to go to Vince.

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