[DTrace-devel] [PATCH] test: Allow duplicate usym/umod/uaddr if for different pids

[Kris Van Hees]

Withdrawing R-b for now after seeing these tests fail after this patch was
merged.  Needs further investigation.

On Mon, Jan 06, 2025 at 04:04:25PM -0500, Kris Van Hees wrote:
> On Thu, Dec 05, 2024 at 02:13:18PM -0500, eugene.loh at oracle.com wrote:
> > From: Eugene Loh <eugene.loh at oracle.com>
> > 
> > In 83da884cbdc5 ("Preface usym/umod/uaddr with pid"), a bug was fixed
> > in which addresses in the same module (or function) might be mapped to
> > multiple agg entries.  This fix helped the associated tests run much
> > more successfully.  Nonetheless, tests would sometimes still fail.
> > 
> > Another problem is that the tests themselves were overly narrow.  It
> > is fine for a module (or function) to appear multiple times in the
> > aggregation output... if those entries correspond to different pids.
> > 
> > Further, odd behaviors can result for some of the processes running on
> > a system.
> > 
> > Change the tests to add a "pid" agg key.  Filter on only a few, select
> > pids.  Distinguish agg entries by pid.
> > 
> > There are still occasional time outs observed with these tests,
> > presumably because the tick-2s probe is not firing (when profile-1234hz
> > is running).
> > 
> > Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
> 
> Reviewed-by: Kris Van Hees <kris.van.hees at oracle.com>
> 
> > ---
> >  test/unittest/profile-n/tst.ufunc.sh | 12 ++++++++----
> >  test/unittest/profile-n/tst.umod.sh  | 11 ++++++++---
> >  test/unittest/profile-n/tst.usym.sh  | 11 ++++++++---
> >  3 files changed, 24 insertions(+), 10 deletions(-)
> > 
> > diff --git a/test/unittest/profile-n/tst.ufunc.sh b/test/unittest/profile-n/tst.ufunc.sh
> > index 243822407..f5174a1e2 100755
> > --- a/test/unittest/profile-n/tst.ufunc.sh
> > +++ b/test/unittest/profile-n/tst.ufunc.sh
> > @@ -11,10 +11,14 @@ tmpfile=$tmpdir/tst.profile_ufunc.$$
> >  script()
> >  {
> >  	$dtrace $dt_flags -qs /dev/stdin <<EOF
> > +	BEGIN
> > +	{
> > +		printf("dtrace is %d\n", \$pid);
> > +	}
> >  	profile-1234hz
> >  	/arg1 != 0/
> >  	{
> > -		@[ufunc(arg1)] = count();
> > +		@[ufunc(arg1), pid] = count();
> >  	}
> >  
> >  	tick-2s
> > @@ -52,9 +56,9 @@ if ! grep -q 'bash`[a-zA-Z_]' $tmpfile; then
> >  	status=1
> >  fi
> >  
> > -# Check that functions are unique.  (Exclude shared libraries and unresolved addresses.)
> > -if gawk '!/^ *(ld-linux-|lib|([^`]*`)?0x)/ {print $1}' $tmpfile | \
> > -     sort | uniq -c | grep -qv " 1 "; then
> > +# Check that functions are unique for each pid that interests us.
> > +dtpid=`awk '/^dtrace is [0-9]*$/ { print $3 }' $tmpfile`
> > +if gawk '$2 == '$child' || $2 == '$dtpid' {print $1, $2}' $tmpfile | sort | uniq -c | grep -qv " 1 "; then
> >  	echo ERROR: duplicate ufunc
> >  	status=1
> >  fi
> > diff --git a/test/unittest/profile-n/tst.umod.sh b/test/unittest/profile-n/tst.umod.sh
> > index 45d2b1e9b..7cfe2a073 100755
> > --- a/test/unittest/profile-n/tst.umod.sh
> > +++ b/test/unittest/profile-n/tst.umod.sh
> > @@ -11,10 +11,14 @@ tmpfile=$tmpdir/tst.profile_umod.$$
> >  script()
> >  {
> >  	$dtrace $dt_flags -qs /dev/stdin <<EOF
> > +	BEGIN
> > +	{
> > +		printf("dtrace is %d\n", \$pid);
> > +	}
> >  	profile-1234hz
> >  	/arg1 != 0/
> >  	{
> > -		@[umod(arg1)] = count();
> > +		@[umod(arg1), pid] = count();
> >  	}
> >  
> >  	tick-2s
> > @@ -52,8 +56,9 @@ if ! grep -wq 'bash' $tmpfile; then
> >  	status=1
> >  fi
> >  
> > -# Check that modules are unique.  (Exclude shared libraries and unresolved addresses.)
> > -if gawk '!/^ *lib/ && !/^ *ld-.*\.so / && !/^ *0x/ {print $1}' $tmpfile | sort | uniq -c | grep -qv " 1 "; then
> > +# Check that modules are unique for each pid that interests us.
> > +dtpid=`awk '/^dtrace is [0-9]*$/ { print $3 }' $tmpfile`
> > +if gawk '$2 == '$child' || $2 == '$dtpid' {print $1, $2}' $tmpfile | sort | uniq -c | grep -qv " 1 "; then
> >  	echo ERROR: duplicate umod
> >  	status=1
> >  fi
> > diff --git a/test/unittest/profile-n/tst.usym.sh b/test/unittest/profile-n/tst.usym.sh
> > index 634e633b3..8e373b976 100755
> > --- a/test/unittest/profile-n/tst.usym.sh
> > +++ b/test/unittest/profile-n/tst.usym.sh
> > @@ -11,10 +11,14 @@ tmpfile=$tmpdir/tst.profile_usym.$$
> >  script()
> >  {
> >  	$dtrace $dt_flags -qs /dev/stdin <<EOF
> > +	BEGIN
> > +	{
> > +		printf("dtrace is %d\n", \$pid);
> > +	}
> >  	profile-1234hz
> >  	/arg1 != 0/
> >  	{
> > -		@[usym(arg1)] = count();
> > +		@[usym(arg1), pid] = count();
> >  	}
> >  
> >  	tick-2s
> > @@ -52,8 +56,9 @@ if ! grep -q 'bash`[a-zA-Z_]' $tmpfile; then
> >  	status=1
> >  fi
> >  
> > -# Check that symbols are unique.  (Exclude shared libraries and unresolved addresses.)
> > -if gawk '!/^ *lib/ && !/^ *0x/ {print $1}' $tmpfile | sort | uniq -c | grep -qv " 1 "; then
> > +# Check that symbols are unique for each pid that interests us.
> > +dtpid=`awk '/^dtrace is [0-9]*$/ { print $3 }' $tmpfile`
> > +if gawk '$2 == '$child' || $2 == '$dtpid' {print $1, $2}' $tmpfile | sort | uniq -c | grep -qv " 1 "; then
> >  	echo ERROR: duplicate usym
> >  	status=1
> >  fi
> > -- 
> > 2.43.5
> >