octave crash with repetitive 'clear functions'

[kahacjde]

While playing with optiplux (optilux.sf.net) again, which is written for
octave and matlab, I ran into problems.

I could reduce the problem to the following example. When running
myscript.m, which calls myfun.m octave dies with a segmentation fault at
the second 'clear functions'.

kai@LxLap:~/hg-octave/octave> cat myscript.m
clear functions
myfun
clear functions
kai@LxLap:~/hg-octave/octave> cat myfun.m
function myfun
function f1
function f2
kai@LxLap:~/hg-octave/octave> ./run-octave --silent
adding ssprop to path
adding optilux to path
octave:1> myscript
panic: Segmentation fault -- stopping myself...
attempting to save variables to `octave-core'...
save to `octave-core' complete
Speicherzugriffsfehler
kai@LxLap:~/hg-octave/octave>

I have observed this with a recent tip (yesterday), but not with the
mingw octave3.2.2 binary. Can someone confirm this crash?


Attached is a backtrace of the crash:

octave:1>
myscript                                                                  

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb577f9e0 (LWP 5227)]        
0x00000004 in ?? ()                                
(gdb) bt                                          
#0  0x00000004 in ?? ()
#1  0xb692345c in do_clear_functions (argv=@0xbfaafac0, argc=2, idx=2,
exclusive=192)
    at variables.cc:1936
#2  0xb6927ca8 in Fclear (args=@0x83cd200) at variables.cc:2073
#3  0xb6a1c2c7 in octave_builtin::do_multi_index_op (this=0x8110ae0,
nargout=0,
    args=@0x83cd200) at ov-builtin.cc:107
#4  0xb6a1b2db in octave_builtin::subsref (this=0x8110ae0, type=@0xbfaafe08,
    idx=@0xbfaafdfc, nargout=0) at ov-builtin.cc:55
#5  0xb69d4ec8 in octave_value::subsref (this=0xbfaafe1c, type=@0xbfaafe08,
    idx=@0xbfaafdfc, nargout=0) at ov.cc:1173
#6  0xb6b00dfb in tree_index_expression::rvalue (this=0x843acc0, nargout=0)
    at pt-idx.cc:398
#7  0xb6b017f4 in tree_index_expression::rvalue1 (this=0x843acc0, nargout=0)
    at pt-idx.cc:409
#8  0xb6af2c21 in tree_evaluator::visit_statement (this=0xb71612cc,
stmt=@0x843d0b0)
    at pt-eval.cc:695
#9  0xb6b186bb in tree_statement::accept (this=0x843d0b0, tw=@0xb71612cc)
    at pt-stmt.cc:152
#10 0xb6af1e6b in tree_evaluator::visit_statement_list (this=0xb71612cc,
    lst=@0x8419200) at pt-eval.cc:731
#11 0xb6b186db in tree_statement_list::accept (this=0x8419200,
tw=@0xb71612cc)
    at pt-stmt.cc:216
#12 0xb6a24606 in octave_user_script::do_multi_index_op (this=0x81d6d18,
nargout=0,
    args=@0xbfab0048) at ov-usr-fcn.cc:137

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[kahacjde]

-------- Original-Nachricht --------
> Datum: Thu, 22 Oct 2009 14:12:35 +0200
> Von: Kai Habel <kai.habel@...>
> An: bug-octave@...
> Betreff: octave crash with repetitive \'clear functions\'

> While playing with optiplux (optilux.sf.net) again, which is written for
> octave and matlab, I ran into problems.
>
> I could reduce the problem to the following example. When running
> myscript.m, which calls myfun.m octave dies with a segmentation fault at
> the second 'clear functions'.
>
> kai@LxLap:~/hg-octave/octave> cat myscript.m
> clear functions
> myfun
> clear functions
> kai@LxLap:~/hg-octave/octave> cat myfun.m
> function myfun
> function f1
> function f2
> kai@LxLap:~/hg-octave/octave> ./run-octave --silent
> adding ssprop to path
> adding optilux to path
> octave:1> myscript
> panic: Segmentation fault -- stopping myself...
> attempting to save variables to `octave-core'...
> save to `octave-core' complete
> Speicherzugriffsfehler
> kai@LxLap:~/hg-octave/octave>
>
> I have observed this with a recent tip (yesterday), but not with the
> mingw octave3.2.2 binary. Can someone confirm this crash?
>

Nobody? I had the chance to test it on a second Opensuse system and still see the crash, so I suspect the problem is with octave and not with my local installation(s).

To test, create two files:

1.myfun.m

function myfun
function f1
function f2

2. myscript.m

clear functions
myfun
clear functions

If I call myscript octave dies with a segmentation fault.

Kai
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[Thomas Weber-8]

Hi Kai,

On Mon, Oct 26, 2009 at 09:09:54PM +0100, Kai Habel wrote:

>
> -------- Original-Nachricht --------
> > Datum: Thu, 22 Oct 2009 14:12:35 +0200
> > Von: Kai Habel <kai.habel@...>
> > An: bug-octave@...
> > Betreff: octave crash with repetitive \'clear functions\'
>
> > While playing with optiplux (optilux.sf.net) again, which is written for
> > octave and matlab, I ran into problems.
> >
> > I could reduce the problem to the following example. When running
> > myscript.m, which calls myfun.m octave dies with a segmentation fault at
> > the second 'clear functions'.
> >
> > kai@LxLap:~/hg-octave/octave> cat myscript.m
> > clear functions
> > myfun
> > clear functions
> > kai@LxLap:~/hg-octave/octave> cat myfun.m
> > function myfun
> > function f1
> > function f2
> > kai@LxLap:~/hg-octave/octave> ./run-octave --silent
> > adding ssprop to path
> > adding optilux to path
> > octave:1> myscript
> > panic: Segmentation fault -- stopping myself...
> > attempting to save variables to `octave-core'...
> > save to `octave-core' complete
> > Speicherzugriffsfehler
> > kai@LxLap:~/hg-octave/octave>
> >
> > I have observed this with a recent tip (yesterday), but not with the
> > mingw octave3.2.2 binary. Can someone confirm this crash?
> >
>
> Nobody? I had the chance to test it on a second Opensuse system and
> still see the crash, so I suspect the problem is with octave and not
> with my local installation(s).

I just tested this on Debian (amd64) and it crashes here as well. Sorry,
no more info. I need to get some sleep now.

        Thomas
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[David Grundberg-2]

Kai Habel wrote:

> -------- Original-Nachricht --------
>  
>> Datum: Thu, 22 Oct 2009 14:12:35 +0200
>> Von: Kai Habel <kai.habel@...>
>> An: bug-octave@...
>> Betreff: octave crash with repetitive \'clear functions\'
>>    
>
>  
>> While playing with optiplux (optilux.sf.net) again, which is written for
>> octave and matlab, I ran into problems.
>>
>> I could reduce the problem to the following example. When running
>> myscript.m, which calls myfun.m octave dies with a segmentation fault at
>> the second 'clear functions'.
>>
>> kai@LxLap:~/hg-octave/octave> cat myscript.m
>> clear functions
>> myfun
>> clear functions
>> kai@LxLap:~/hg-octave/octave> cat myfun.m
>> function myfun
>> function f1
>> function f2
>> kai@LxLap:~/hg-octave/octave> ./run-octave --silent
>> adding ssprop to path
>> adding optilux to path
>> octave:1> myscript
>> panic: Segmentation fault -- stopping myself...
>> attempting to save variables to `octave-core'...
>> save to `octave-core' complete
>> Speicherzugriffsfehler
>> kai@LxLap:~/hg-octave/octave>
>>
>> I have observed this with a recent tip (yesterday), but not with the
>> mingw octave3.2.2 binary. Can someone confirm this crash?
>>
>>    
>
> Nobody? I had the chance to test it on a second Opensuse system and still see the crash, so I suspect the problem is with octave and not with my local installation(s).
>
> To test, create two files:
>
> 1.myfun.m
>
> function myfun
> function f1
> function f2
>
> 2. myscript.m
>
> clear functions
> myfun
> clear functions
>
> If I call myscript octave dies with a segmentation fault.
>
> Kai
> _______________________________________________
> Bug-octave mailing list
> Bug-octave@...
> https://www-old.cae.wisc.edu/mailman/listinfo/bug-octave
>  

Segfaults in 9747:7bda650b691a. Note that if myfun.m contains no
subfunctions, like

myfun.m:

function myfun

then clear functions doesn't crash.

David
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[kahacjde]

-------- Original-Nachricht --------
> Datum: Tue, 27 Oct 2009 09:25:57 +0100
> Von: David Grundberg <individ@...>
> An: Kai Habel <kai.habel@...>
> CC: bug@...
> Betreff: Re: octave crash with repetitive \'clear functions\'

> Kai Habel wrote:
> > -------- Original-Nachricht --------
> >  
> >> Datum: Thu, 22 Oct 2009 14:12:35 +0200
> >> Von: Kai Habel <kai.habel@...>
> >> An: bug-octave@...
> >> Betreff: octave crash with repetitive \'clear functions\'
> >>    
> >
> >  
> >> While playing with optiplux (optilux.sf.net) again, which is written
> for
> >> octave and matlab, I ran into problems.
> >>
> >> I could reduce the problem to the following example. When running
> >> myscript.m, which calls myfun.m octave dies with a segmentation fault
> at
> >> the second 'clear functions'.
> >>
> >> kai@LxLap:~/hg-octave/octave> cat myscript.m
> >> clear functions
> >> myfun
> >> clear functions
> >> kai@LxLap:~/hg-octave/octave> cat myfun.m
> >> function myfun
> >> function f1
> >> function f2
> >> kai@LxLap:~/hg-octave/octave> ./run-octave --silent
> >> adding ssprop to path
> >> adding optilux to path
> >> octave:1> myscript
> >> panic: Segmentation fault -- stopping myself...
> >> attempting to save variables to `octave-core'...
> >> save to `octave-core' complete
> >> Speicherzugriffsfehler
> >> kai@LxLap:~/hg-octave/octave>
> >>
> >> I have observed this with a recent tip (yesterday), but not with the
> >> mingw octave3.2.2 binary. Can someone confirm this crash?
> >>
> >>    
> >
> > Nobody? I had the chance to test it on a second Opensuse system and
> still see the crash, so I suspect the problem is with octave and not with my
> local installation(s).
> >
> > To test, create two files:
> >
> > 1.myfun.m
> >
> > function myfun
> > function f1
> > function f2
> >
> > 2. myscript.m
> >
> > clear functions
> > myfun
> > clear functions
> >
> > If I call myscript octave dies with a segmentation fault.
> >
> > Kai
> > _______________________________________________
> > Bug-octave mailing list
> > Bug-octave@...
> > https://www-old.cae.wisc.edu/mailman/listinfo/bug-octave
> >  
>
>
> Segfaults in 9747:7bda650b691a. Note that if myfun.m contains no
> subfunctions, like
>
> myfun.m:
>
> function myfun
>
> then clear functions doesn't crash.
>
> David

Thanks for your confirmation. Indeed, if you remove any line of the example above, octave does not crash anymore.

Kai
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[kahacjde]

-------- Original-Nachricht --------
> Datum: Tue, 27 Oct 2009 00:21:18 +0100
> Von: Thomas Weber <thomas.weber.mail@...>
> An: Kai Habel <kai.habel@...>
> CC: Octave Bugs <bug-octave@...>
> Betreff: Re: octave crash with repetitive \'clear functions\'

> Hi Kai,
>
> On Mon, Oct 26, 2009 at 09:09:54PM +0100, Kai Habel wrote:
> >
> > -------- Original-Nachricht --------
> > > Datum: Thu, 22 Oct 2009 14:12:35 +0200
> > > Von: Kai Habel <kai.habel@...>
> > > An: bug-octave@...
> > > Betreff: octave crash with repetitive \'clear functions\'
> >
> > > While playing with optiplux (optilux.sf.net) again, which is written
> for
> > > octave and matlab, I ran into problems.
> > >
> > > I could reduce the problem to the following example. When running
> > > myscript.m, which calls myfun.m octave dies with a segmentation fault
> at
> > > the second 'clear functions'.
> > >
> > > kai@LxLap:~/hg-octave/octave> cat myscript.m
> > > clear functions
> > > myfun
> > > clear functions
> > > kai@LxLap:~/hg-octave/octave> cat myfun.m
> > > function myfun
> > > function f1
> > > function f2
> > > kai@LxLap:~/hg-octave/octave> ./run-octave --silent
> > > adding ssprop to path
> > > adding optilux to path
> > > octave:1> myscript
> > > panic: Segmentation fault -- stopping myself...
> > > attempting to save variables to `octave-core'...
> > > save to `octave-core' complete
> > > Speicherzugriffsfehler
> > > kai@LxLap:~/hg-octave/octave>
> > >
> > > I have observed this with a recent tip (yesterday), but not with the
> > > mingw octave3.2.2 binary. Can someone confirm this crash?
> > >
> >
> > Nobody? I had the chance to test it on a second Opensuse system and
> > still see the crash, so I suspect the problem is with octave and not
> > with my local installation(s).
>
> I just tested this on Debian (amd64) and it crashes here as well. Sorry,
> no more info. I need to get some sleep now.
>
> Thomas

Hello Thomas,

thanks for your confirmation. Unfortunatly this beyond my knowledge of octave, so I have to leave the debugging to a core developer.

Kai
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[John W. Eaton-3]

On 27-Oct-2009, Kai Habel wrote:

| -------- Original-Nachricht --------
| > Datum: Tue, 27 Oct 2009 00:21:18 +0100
| > Von: Thomas Weber <thomas.weber.mail@...>
| > An: Kai Habel <kai.habel@...>
| > CC: Octave Bugs <bug-octave@...>
| > Betreff: Re: octave crash with repetitive \'clear functions\'
|
| > Hi Kai,
| >
| > On Mon, Oct 26, 2009 at 09:09:54PM +0100, Kai Habel wrote:
| > >
| > > -------- Original-Nachricht --------
| > > > Datum: Thu, 22 Oct 2009 14:12:35 +0200
| > > > Von: Kai Habel <kai.habel@...>
| > > > An: bug-octave@...
| > > > Betreff: octave crash with repetitive \'clear functions\'
| > >
| > > > While playing with optiplux (optilux.sf.net) again, which is written
| > for
| > > > octave and matlab, I ran into problems.
| > > >
| > > > I could reduce the problem to the following example. When running
| > > > myscript.m, which calls myfun.m octave dies with a segmentation fault
| > at
| > > > the second 'clear functions'.
| > > >
| > > > kai@LxLap:~/hg-octave/octave> cat myscript.m
| > > > clear functions
| > > > myfun
| > > > clear functions
| > > > kai@LxLap:~/hg-octave/octave> cat myfun.m
| > > > function myfun
| > > > function f1
| > > > function f2
| > > > kai@LxLap:~/hg-octave/octave> ./run-octave --silent
| > > > adding ssprop to path
| > > > adding optilux to path
| > > > octave:1> myscript
| > > > panic: Segmentation fault -- stopping myself...
| > > > attempting to save variables to `octave-core'...
| > > > save to `octave-core' complete
| > > > Speicherzugriffsfehler
| > > > kai@LxLap:~/hg-octave/octave>
| > > >
| > > > I have observed this with a recent tip (yesterday), but not with the
| > > > mingw octave3.2.2 binary. Can someone confirm this crash?
| > > >
| > >
| > > Nobody? I had the chance to test it on a second Opensuse system and
| > > still see the crash, so I suspect the problem is with octave and not
| > > with my local installation(s).
| >
| > I just tested this on Debian (amd64) and it crashes here as well. Sorry,
| > no more info. I need to get some sleep now.
| >
| > Thomas
|
| Hello Thomas,
|
| thanks for your confirmation. Unfortunatly this beyond my knowledge of octave, so I have to leave the debugging to a core developer.

I checked in the following change.

  http://hg.savannah.gnu.org/hgweb/octave/rev/5f8971be8e12

Thanks,

jwe
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[kahacjde]

John W. Eaton schrieb:

> On 27-Oct-2009, Kai Habel wrote:
>
> | -------- Original-Nachricht --------
> | > Datum: Tue, 27 Oct 2009 00:21:18 +0100
> | > Von: Thomas Weber <thomas.weber.mail@...>
> | > An: Kai Habel <kai.habel@...>
> | > CC: Octave Bugs <bug-octave@...>
> | > Betreff: Re: octave crash with repetitive \'clear functions\'
> |
> | > Hi Kai,
> | >
> | > On Mon, Oct 26, 2009 at 09:09:54PM +0100, Kai Habel wrote:
> | > >
> | > > -------- Original-Nachricht --------
> | > > > Datum: Thu, 22 Oct 2009 14:12:35 +0200
> | > > > Von: Kai Habel <kai.habel@...>
> | > > > An: bug-octave@...
> | > > > Betreff: octave crash with repetitive \'clear functions\'
> | > >
> | > > > While playing with optiplux (optilux.sf.net) again, which is written
> | > for
> | > > > octave and matlab, I ran into problems.
> | > > >
> | > > > I could reduce the problem to the following example. When running
> | > > > myscript.m, which calls myfun.m octave dies with a segmentation fault
> | > at
> | > > > the second 'clear functions'.
> | > > >
> | > > > kai@LxLap:~/hg-octave/octave> cat myscript.m
> | > > > clear functions
> | > > > myfun
> | > > > clear functions
> | > > > kai@LxLap:~/hg-octave/octave> cat myfun.m
> | > > > function myfun
> | > > > function f1
> | > > > function f2
> | > > > kai@LxLap:~/hg-octave/octave> ./run-octave --silent
> | > > > adding ssprop to path
> | > > > adding optilux to path
> | > > > octave:1> myscript
> | > > > panic: Segmentation fault -- stopping myself...
> | > > > attempting to save variables to `octave-core'...
> | > > > save to `octave-core' complete
> | > > > Speicherzugriffsfehler
> | > > > kai@LxLap:~/hg-octave/octave>
> | > > >
> | > > > I have observed this with a recent tip (yesterday), but not with the
> | > > > mingw octave3.2.2 binary. Can someone confirm this crash?
> | > > >
> | > >
> | > > Nobody? I had the chance to test it on a second Opensuse system and
> | > > still see the crash, so I suspect the problem is with octave and not
> | > > with my local installation(s).
> | >
> | > I just tested this on Debian (amd64) and it crashes here as well. Sorry,
> | > no more info. I need to get some sleep now.
> | >
> | > Thomas
> |
> | Hello Thomas,
> |
> | thanks for your confirmation. Unfortunatly this beyond my knowledge of octave, so I have to leave the debugging to a core developer.
>
> I checked in the following change.
>
>   http://hg.savannah.gnu.org/hgweb/octave/rev/5f8971be8e12
>
> Thanks,
>
> jwe
>  

Thanks for fixing. It solves the reported and the original problem on my
systems.

Kai
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