torture: Make --kcsan argument also create a summary

The KCSAN tool emits a great many warnings for current kernels, for
example, a one-hour run of the full set of rcutorture scenarios results
in no fewer than 3252 such warnings, many of which are duplicates
or are otherwise closely related.  This commit therefore introduces
a kcsan-collapse.sh script that maps these warnings down to a set of
function pairs (22 of them given the 3252 individual warnings), placing
the resulting list in decreasing order of frequency of occurrence into
a kcsan.sum file.  If any KCSAN warnings were produced, the pathname of
this file is emitted at the end of the summary of the rcutorture runs.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/tools/testing/selftests/rcutorture/bin/kcsan-collapse.sh b/tools/testing/selftests/rcutorture/bin/kcsan-collapse.sh
new file mode 100755 (executable)
index 0000000..e5cc6b2
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/bin/kcsan-collapse.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+#
+# If this was a KCSAN run, collapse the reports in the various console.log
+# files onto pairs of functions.
+#
+# Usage: kcsan-collapse.sh resultsdir
+#
+# Copyright (C) 2020 Facebook, Inc.
+#
+# Authors: Paul E. McKenney <paulmck@kernel.org>
+
+if test -z "$TORTURE_KCONFIG_KCSAN_ARG"
+then
+       exit 0
+fi
+cat $1/*/console.log |
+       grep "BUG: KCSAN: " |
+       sed -e 's/^\[[^]]*] //' |
+       sort |
+       uniq -c |
+       sort -k1nr > $1/kcsan.sum

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
index 0326f4a5ff9c35f547adb7497a5ec97a6a3bc840..736f04749b90783db481504f867ca0fc5614ffaf 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
@@ -70,6 +70,15 @@ do
                        fi
                fi
        done
+       if test -f "$rd/kcsan.sum"
+       then
+               if test -s "$rd/kcsan.sum"
+               then
+                       echo KCSAN summary in $rd/kcsan.sum
+               else
+                       echo Clean KCSAN run in $rd
+               fi
+       fi
 done
 EDITOR=echo kvm-find-errors.sh "${@: -1}" > $T 2>&1
 ret=$?

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index 34b368d32883325e227f043ea7bba50fdb368161..75ae8e3f62c60a7b496f2ee0fb0a5764669f1912 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -472,6 +472,7 @@ echo
 echo
 echo " --- `date` Test summary:"
 echo Results directory: $resdir/$ds
+kcsan-collapse.sh $resdir/$ds
 kvm-recheck.sh $resdir/$ds
 ___EOF___