[Gcl-devel] Re: interrupts in 64-bit GCL

[Camm Maguire]

Greetings, and thanks!  OK, this is fixed now in branch 2.6.8pre of
cvs, and will be in cvs head soon.  Please let me know if you need a
reminder about how to get 2.6.8pre.

Take care,

Matt Kaufmann <address@hidden> writes:

> Hi --
>
> I was able to reproduce the error after building ACL2 a new debug copy
> of 64-bit gcl that the sysadmins built.  Same instructions as before,
> except for a slight change in the ACL2 executable directory.  Quoting
> from below, but updating the executable path (and fixing a misleading
> comment):
>
>   Start up ACL2 built on GCL, as follows:
>
>   /projects/acl2/v3-4-linux-64/fast-linux-gcl-saved_acl2
>
>   Then issue these commands:
>
>     ; Just to slow down the output from the thm form below:
>     (trace$ rewrite)
>
>     ; ACL2 disables the debugger by default; this restores it:
>     (set-debugger-enable t)
>
>     ; This goes pretty fast but you'll have time to interrupt it:
>     (thm (equal (append (append x x) x) (append x x x)))
>
>     [Now quickly interrupt with control-c, and then :q from the break.
>      If the form above completes, just try it again.  Eventually I think
>      you'll see a Lisp "fatal error" or even a "Segmentation fault".]
>
> It seems to take me about 3 to 5 THM calls to get the error, which
> looks like this:
>
>   ACL2 !>(thm (equal (append (append x x) x) (append x x x)))
>   [SGC off]
>   Error: Caught fatal error [memory may be damaged]
>   Fast links are on: do (si::use-fast-links nil) for debugging
>   Error signalled by ACL2_*1*_ACL2::THM-FN.
>   Broken at COND.  Type :H for Help.
>   ACL2[RAW LISP]>>
>
> -- Matt
>    Date: Mon, 23 Feb 2009 17:12:04 -0600
>    From: "David A. Kotz" <address@hidden>
>    CC: address@hidden, address@hidden, address@hidden
>
>    I've replaced both of our 64bit flavors and the 32bit with debug-enabled 
>    versions.  The 64s are in place now, and the 32 should rdist around 
>    tonight.  I want to keep all of them in sync, even if we're only 
>    investigating a problem in one.
>
>    - dave
>
>
>    Matt Kaufmann wrote:
>    > Thanks, Dave!  I really appreciate it.
>    > 
>    > When I get the word from you, or when I see
>    > /lusr/opt/gcl-2.6.8pre/bin/gcl updated on lhug-0, I'll rebuild ACL2 on
>    > top of it and try to reproduce the problem.
>    > 
>    > Thanks again --
>    > -- Matt
>    >    Date: Mon, 23 Feb 2009 10:13:54 -0600
>    >    From: "David A. Kotz" <address@hidden>
>    >    CC: Matt Kaufmann <address@hidden>, address@hidden,
>    >     address@hidden
>    > 
>    >    I'll rebuild it with the debug flag.
>    > 
>    >    - dave
>    > 
>    > 
>    >    Camm Maguire wrote:
>    >    > Thanks!  Please let me know if you run into troubles here.
>    >    > 
>    >    > Take care,
>    >    > 
>    >    > Matt Kaufmann <address@hidden> writes:
>    >    > 
>    >    >> Howdy --
>    >    >>
>    >    >> Thanks for the reply.
>    >    >>
>    >    >> If address@hidden is willing to do (1), or to send me the exact 
> configure
>    >    >> and make commands and source directory used so that I can do it
>    >    >> myself, then I'll try to reproduce the error by building ACL2 on 
> top
>    >    >> of it.  I'm assuming that --enable-debug is given to the configure
>    >    >> command, not to make.
>    >    >>
>    >    >> Then if if I can't reproduce the problem, I'll let you and 
> address@hidden
>    >    >> know and we can explore (2).  In that case, if address@hidden is 
> willing to
>    >    >> do it, great; then I'll try to reproduce the problem.  But if I'm 
> to
>    >    >> do the build, I'd need explicit instructions on how to "make sure 
> -g
>    >    >> is included in the gcc calls"; maybe I need to do some setq in 
> Lisp?
>    >    >> Also I didn't understand the comment about makedefs.  But I guess 
> we
>    >    >> can ignore (2) if (1) works.
>    >    >>
>    >    >> -- Matt
>    >    >>    Cc: address@hidden, address@hidden
>    >    >>    From: Camm Maguire <address@hidden>
>    >    >>    Date: Fri, 20 Feb 2009 20:58:49 -0500
>    >    >>    X-SpamAssassin-Status: No, hits=-2.6 required=5.0
>    >    >>    X-UTCS-Spam-Status: No, hits=-282 required=165
>    >    >>
>    >    >>    Greetings!  I suspect a missing signal block around some code 
> that
>    >    >>    needs protecting.  I've reprodced under gdb, but there are no
>    >    >>    debugging symbols in the image.  [ Question for list -- have 
> computers
>    >    >>    now become so fast that -g should be included by default in all 
> gcl
>    >    >>    images? It used to slow down the compiler, don't know about 
> now.  It
>    >    >>    does make the image quite a bit bigger. ]
>    >    >>
>    >    >>    Ideally, you or someone else at the site might be so kind as to
>    >    >>    rebuild atop
>    >    >>
>    >    >>    1) a gcl build with --enable-debug.  If this does not 
> reproduce, then
>    >    >>    in addition
>    >    >>    2) rebuild atop a standard gcl with the CFLAGS environment 
> variable
>    >    >>    set to -g before configure and make.  Please make sure -g is 
> included
>    >    >>    in the gcc calls.  Otherwise, makedefs can be modified after 
> configure
>    >    >>    and before make to include -g wherever one sees -O3 or -O
>    >    >>
>    >    >>    Would this be too much trouble?
>    >    >>
>    >    >>    Take care,
>    >    >>
>    >    >>    Matt Kaufmann <address@hidden> writes:
>    >    >>
>    >    >>    > Hi --
>    >    >>    >
>    >    >>    > The sysadmins here at UT CS have built GCL 2.6.8pre from CVS 
> as you
>    >    >>    > suggested.  It's working great on 32-bit linux, but I've run 
> into an
>    >    >>    > issue for 64-bit linux.
>    >    >>    >
>    >    >>    > You can re-create the issue on a UT CS 64-bit linux machine as
>    >    >>    > follows.
>    >    >>    >
>    >    >>    > Start up ACL2 built on GCL, as follows:
>    >    >>    >
>    >    >>    > /projects/acl2/v3-4-linux/fast-linux-gcl-saved_acl2
>    >    >>    >
>    >    >>    > Then issue these commands:
>    >    >>    >
>    >    >>    >   ; Just to slow down the output from the next form:
>    >    >>    >   (trace$ rewrite)
>    >    >>    >
>    >    >>    >   ; ACL2 disables the debugger by default; this restores it:
>    >    >>    >   (set-debugger-enable t)
>    >    >>    >
>    >    >>    >   ; This goes pretty fast but you'll have time to interrupt 
> it:
>    >    >>    >   (thm (equal (append (append x x) x) (append x x x)))
>    >    >>    >
>    >    >>    >   [Now quickly interrupt with control-c, and then :q from the 
> break.
>    >    >>    >    If the form above completes, just try it again.  
> Eventually I think
>    >    >>    >    you'll see a Lisp "fatal error" or even a "Segmentation 
> fault".]
>    >    >>    >
>    >    >>    > By the way, I built /projects/acl2/v3-4-linux/fast-linux-gcl 
> as
>    >    >>    > follows, on lhug-0 (a 64-bit linux machine):
>    >    >>    >
>    >    >>    > rm -f TAGS ; mv make-fast-gcl.log make-fast-gcl.old.log ; 
> (time nice make PREFIX=fast-linux-gcl- LISP=my-fast-gcl) >& make-fast-gcl.log&
>    >    >>    >
>    >    >>    > where "my-fast-gcl" is a script containing:
>    >    >>    >
>    >    >>    > #!/bin/sh
>    >    >>    > /lusr/opt/gcl-2.6.8pre/bin/gcl -eval "(defparameter 
> user::*fast-acl2-gcl-build* t)" $*
>    >    >>    >
>    >    >>    > Also by the way, if you instead run the following on a 32-bit 
> UT CS
>    >    >>    > linux machine
>    >    >>    >
>    >    >>    > /projects/acl2/v3-4-linux/gcl-saved_acl2
>    >    >>    >
>    >    >>    > then you won't see the interrupt problem described above (or 
> at least,
>    >    >>    > I didn't, and I tried).
>    >    >>    >
>    >    >>    > Thanks --
>    >    >>    > -- Matt
>    >    >>    >
>    >    >>    >
>    >    >>    >
>    >    >>    >
>    >    >>
>    >    >>    -- 
>    >    >>    Camm Maguire                                        
> address@hidden
>    >    >>    
> ==========================================================================
>    >    >>    "The earth is but one country, and mankind its citizens."  --  
> Baha'u'llah
>    >    >>
>    >    >>
>    >    >>
>    >    >>
>    >    > 
>
>
>
>

-- 
Camm Maguire                                        address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah