Re: [Valgrind-developers] Shell fails when under valgrind-3.7.0's control with "--tool=none" ? ... / was: Fwd: ast-ksh.2012-05-18 failures in "arith.sh" when under valgrind control...

[Julian S. <js...@ac...>]

A setuid related problem, maybe?  We have had those in the past.

J

On Wednesday, June 27, 2012, Roland Mainz wrote:
> Hi!
> 
> ----
> 
> Does anyone remember any reasons why an application under control of $
> valgrind --tool=none ... # can fail (valgrind version is 3.7.0)?
> We're seeing the following failures (test script attached as
> "ksh_valgrind_arith_sh_compound_var_arithmetic_failed.sh.txt") with
> recent ksh93 versions and I'm not sure why it even fails with
> "--tool=none" (if I remember it right applications should never fail
> with --tool=none unless it's a valgrind bug... right ?) ...
> 
> Steps to reproduce:
> -- snip --
> $ wget --http-user="I accept www.opensource.org/licenses/eclipse"
> --http-passwd="."
> 'http://www.research.att.com/sw/download/beta/INIT.2012-06-26.tgz'
> $ wget --http-user="I accept www.opensource.org/licenses/eclipse"
> --http-passwd="."
> 'http://www.research.att.com/sw/download/beta/ast-ksh.2012-06-26.tgz'
> $ gunzip -c <INIT.2012-06-26.tgz | tar -xf -
> $ gunzip -c <ast-ksh.2012-06-26.tgz | tar -xf -
> $ CC='gcc -g -ggdb -fno-builtin' ./bin/package make 2>&1 | tee -a
> buildlog.log $ cd arch/*/bin
> $ valgrind --tool=none ./ksh valgr_ksh_cmdsubfail.sh
> ==23175== Nulgrind, the minimal Valgrind tool
> ==23175== Copyright (C) 2002-2011, and GNU GPL'd, by Nicholas Nethercote.
> ==23175== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
> ==23175== Command: /home/test001/bin/ksh valgr_ksh_cmdsubfail.sh
> ==23175==
> ==23178==
> compound var arithmetic failed, expected '( bar=2 baz=3 foo=1 )', got ''
> ==23179==
> compound var arithmetic failed, expected '( faz=0 )', got ''
> ==23180==
> compound var arithmetic failed, expected '( foz=777 )', got ''
> ==23181==
> compound var arithmetic failed, expected '( foz=777 )', got ''
> ==23182==
> compound var arithmetic failed, expected '( fuz=777 )', got ''
> ==23183==
> compound var arithmetic failed, expected 0, got ''
> ==23184==
> compound var arithmetic failed, expected 0, got ''
> ==23175==
> -- snip --
> 
> Any ideas/clues/etc. would be welcome...
> 
> ----
> 
> Bye,
> Roland
> 
> ---------- Forwarded message ----------
> From: Roland Mainz <rol...@nr...>
> Date: Sun, May 27, 2012 at 12:25 AM
> Subject: ast-ksh.2012-05-18 failures in "arith.sh" when under valgrind
> control...
> To: ast...@re...
> 
> 
> Hi!
> 
> ----
> 
> Attached (as "ksh_valgrind_arith_sh_compound_var_arithmetic_failed.sh.txt")
> is a test script (derived from the "arith.sh" test module) which fails
> when running ast-ksh.2012-05-18 on SuSE 12.1/AMD64 under valgrind
> control like this:
> -- snip --
> $ valgrind --trace-children=yes --log-file=/dev/null ksh xxx.sh
> compound var arithmetic failed, expected '( bar=2 baz=3 foo=1 )', got ''
> compound var arithmetic failed, expected '( faz=0 )', got ''
> compound var arithmetic failed, expected '( foz=777 )', got ''
> compound var arithmetic failed, expected '( foz=777 )', got ''
> compound var arithmetic failed, expected '( fuz=777 )', got ''
> compound var arithmetic failed, expected 0, got ''
> compound var arithmetic failed, expected 0, got ''
> -- snip --
> Note that "valgrind" does not report any hits... the example uses
> --log-file=/dev/null only to avoid noise in this example.
> 
> I assume this is a bug (and not something caused by valgrinds
> interference with fd usage) because if I change the script and
> uncomment the line containing the '#force_subshell_fork="ulimit -c 0"'
> (the use of "ulimit -c 0" in a subshell will trigger a |fork()| to
> make sure this subshell really runs in a seperate process (this is
> neccesary since calls to "ulimit" can't be undone)) the script works.
> 
> ----
> 
> Bye,
> Roland
> 
> --
>   __ .  . __
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