torture: Make torture.sh tolerate runs having bad kvm.sh arguments

Currently, torture.sh assumes excessive levels of reviewer competence
and thus fails to gracefully handle cases where it is tricked into giving
kvm.sh invalid arguments.  This commit therefore upgrades error handling
to more gracefully handle this situation.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>

Author: paulmckrcu

tools/testing/selftests/rcutorture/bin/torture.sh

@@ -378,13 +378,19 @@ function torture_set {
 	then
 		curflavor=$flavor
 		torture_one "$@"
-		mv $T/last-resdir $T/last-resdir-nodebug || :
+		if test -e $T/last-resdir
+		then
+			mv $T/last-resdir $T/last-resdir-nodebug || :
+		fi
 	fi
 	if test "$do_kasan" = "yes"
 	then
 		curflavor=${flavor}-kasan
 		torture_one "$@" --kasan
-		mv $T/last-resdir $T/last-resdir-kasan || :
+		if test -e $T/last-resdir
+		then
+			mv $T/last-resdir $T/last-resdir-kasan || :
+		fi
 	fi
 	if test "$do_kcsan" = "yes"
 	then
@@ -400,7 +406,10 @@ function torture_set {
 			chk_rdr_state="CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=y"
 		fi
 		torture_one "$@" --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y ${kcsan_expert} ${chk_rdr_state}" $kcsan_kmake_tag $cur_kcsan_kmake_args --kcsan
-		mv $T/last-resdir $T/last-resdir-kcsan || :
+		if test -e $T/last-resdir
+		then
+			mv $T/last-resdir $T/last-resdir-kcsan || :
+		fi
 	fi
 }
 
@@ -704,7 +713,14 @@ nfailures=0
 echo FAILURES: | tee -a $T/log
 if test -s "$T/failures"
 then
-	awk < "$T/failures" -v sq="'" '{ print "echo " sq $0 sq; print "sed -e " sq "1,/^ --- .* Test summary:$/d" sq " " $2 "/log | grep Summary: | sed -e " sq "s/^[^S]*/  /" sq; }' | sh | tee -a $T/log | tee "$T/failuresum"
+	awk < "$T/failures" -v sq="'" '
+	{
+		print "echo " sq $0 sq;
+		if ($2 != "")
+			print "sed -e " sq "1,/^ --- .* Test summary:$/d" sq " " $2 "/log | grep Summary: | sed -e " sq "s/^[^S]*/  /" sq;
+		else
+			print "echo " sq "  " sq "Run failed to produce results directory.";
+	}' | sh | tee -a $T/log | tee "$T/failuresum"
 	nfailures="`wc -l "$T/failures" | awk '{ print $1 }'`"
 	grep "^  Summary: " "$T/failuresum" |
 		grep -v '^  Summary: Bugs: [0-9]* (all bugs kcsan)$' > "$T/nonkcsan"
@@ -714,13 +730,13 @@ then
 	fi
 	ret=2
 fi
-if test "$do_kcsan" = "yes"
+if test "$do_kcsan" = "yes" && test -e tools/testing/selftests/rcutorture/res/$ds
 then
 	TORTURE_KCONFIG_KCSAN_ARG=1 tools/testing/selftests/rcutorture/bin/kcsan-collapse.sh tools/testing/selftests/rcutorture/res/$ds > tools/testing/selftests/rcutorture/res/$ds/kcsan.sum
 fi
 echo Started at $startdate, ended at `date`, duration `get_starttime_duration $starttime`. | tee -a $T/log
 echo Summary: Successes: $nsuccesses Failures: $nfailures. | tee -a $T/log
-tdir="`cat $T/successes $T/failures | head -1 | awk '{ print $NF }' | sed -e 's,/[^/]\+/*$,,'`"
+tdir="`cat $T/successes $T/failures | awk 'NF > 1 { print $NF }' | head -1 | sed -e 's,/[^/]\+/*$,,'`"
 if test -n "$tdir"
 then
 	find "$tdir" -name 'ConfigFragment.diags' -print > $T/configerrors