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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-11 17:34:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-11 17:34:10 -0700
commita379f71a30dddbd2e7393624e455ce53c87965d1 (patch)
treec9c71b3eb19ff7e8618ff29e9d5ac99882b823e1 /tools
parentde34f4da7f62ff59ac6e1ef320b0fcfa3296fce3 (diff)
parent9c5d760b8d229b94c5030863a5edaee5f1a9d7b7 (diff)
Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: - a few block updates that fell in my lap - lib/ updates - checkpatch - autofs - ipc - a ton of misc other things * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits) mm: split gfp_mask and mapping flags into separate fields fs: use mapping_set_error instead of opencoded set_bit treewide: remove redundant #include <linux/kconfig.h> hung_task: allow hung_task_panic when hung_task_warnings is 0 kthread: add kerneldoc for kthread_create() kthread: better support freezable kthread workers kthread: allow to modify delayed kthread work kthread: allow to cancel kthread work kthread: initial support for delayed kthread work kthread: detect when a kthread work is used by more workers kthread: add kthread_destroy_worker() kthread: add kthread_create_worker*() kthread: allow to call __kthread_create_on_node() with va_list args kthread/smpboot: do not park in kthread_create_on_cpu() kthread: kthread worker API cleanup kthread: rename probe_kthread_data() to kthread_probe_data() scripts/tags.sh: enable code completion in VIM mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping kdump, vmcoreinfo: report memory sections virtual addresses ipc/sem.c: add cond_resched in exit_sme ...
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/nvdimm/config_check.c1
-rw-r--r--tools/testing/radix-tree/Makefile3
-rw-r--r--tools/testing/radix-tree/iteration_check.c180
-rw-r--r--tools/testing/radix-tree/main.c1
-rw-r--r--tools/testing/radix-tree/regression1.c2
-rw-r--r--tools/testing/radix-tree/test.h1
6 files changed, 185 insertions, 3 deletions
diff --git a/tools/testing/nvdimm/config_check.c b/tools/testing/nvdimm/config_check.c
index 878daf3429e8..7dc5a0af9b54 100644
--- a/tools/testing/nvdimm/config_check.c
+++ b/tools/testing/nvdimm/config_check.c
@@ -1,4 +1,3 @@
-#include <linux/kconfig.h>
#include <linux/bug.h>
void check(void)
diff --git a/tools/testing/radix-tree/Makefile b/tools/testing/radix-tree/Makefile
index 9d0919ed52a4..f2e07f2fd4b4 100644
--- a/tools/testing/radix-tree/Makefile
+++ b/tools/testing/radix-tree/Makefile
@@ -3,7 +3,8 @@ CFLAGS += -I. -g -O2 -Wall -D_LGPL_SOURCE
LDFLAGS += -lpthread -lurcu
TARGETS = main
OFILES = main.o radix-tree.o linux.o test.o tag_check.o find_next_bit.o \
- regression1.o regression2.o regression3.o multiorder.o
+ regression1.o regression2.o regression3.o multiorder.o \
+ iteration_check.o
targets: $(TARGETS)
diff --git a/tools/testing/radix-tree/iteration_check.c b/tools/testing/radix-tree/iteration_check.c
new file mode 100644
index 000000000000..9adb8e7415a6
--- /dev/null
+++ b/tools/testing/radix-tree/iteration_check.c
@@ -0,0 +1,180 @@
+/*
+ * iteration_check.c: test races having to do with radix tree iteration
+ * Copyright (c) 2016 Intel Corporation
+ * Author: Ross Zwisler <ross.zwisler@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#include <linux/radix-tree.h>
+#include <pthread.h>
+#include "test.h"
+
+#define NUM_THREADS 4
+#define TAG 0
+static pthread_mutex_t tree_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_t threads[NUM_THREADS];
+RADIX_TREE(tree, GFP_KERNEL);
+bool test_complete;
+
+/* relentlessly fill the tree with tagged entries */
+static void *add_entries_fn(void *arg)
+{
+ int pgoff;
+
+ while (!test_complete) {
+ for (pgoff = 0; pgoff < 100; pgoff++) {
+ pthread_mutex_lock(&tree_lock);
+ if (item_insert(&tree, pgoff) == 0)
+ item_tag_set(&tree, pgoff, TAG);
+ pthread_mutex_unlock(&tree_lock);
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Iterate over the tagged entries, doing a radix_tree_iter_retry() as we find
+ * things that have been removed and randomly resetting our iteration to the
+ * next chunk with radix_tree_iter_next(). Both radix_tree_iter_retry() and
+ * radix_tree_iter_next() cause radix_tree_next_slot() to be called with a
+ * NULL 'slot' variable.
+ */
+static void *tagged_iteration_fn(void *arg)
+{
+ struct radix_tree_iter iter;
+ void **slot;
+
+ while (!test_complete) {
+ rcu_read_lock();
+ radix_tree_for_each_tagged(slot, &tree, &iter, 0, TAG) {
+ void *entry;
+ int i;
+
+ /* busy wait to let removals happen */
+ for (i = 0; i < 1000000; i++)
+ ;
+
+ entry = radix_tree_deref_slot(slot);
+ if (unlikely(!entry))
+ continue;
+
+ if (radix_tree_deref_retry(entry)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+
+ if (rand() % 50 == 0)
+ slot = radix_tree_iter_next(&iter);
+ }
+ rcu_read_unlock();
+ }
+
+ return NULL;
+}
+
+/*
+ * Iterate over the entries, doing a radix_tree_iter_retry() as we find things
+ * that have been removed and randomly resetting our iteration to the next
+ * chunk with radix_tree_iter_next(). Both radix_tree_iter_retry() and
+ * radix_tree_iter_next() cause radix_tree_next_slot() to be called with a
+ * NULL 'slot' variable.
+ */
+static void *untagged_iteration_fn(void *arg)
+{
+ struct radix_tree_iter iter;
+ void **slot;
+
+ while (!test_complete) {
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, &tree, &iter, 0) {
+ void *entry;
+ int i;
+
+ /* busy wait to let removals happen */
+ for (i = 0; i < 1000000; i++)
+ ;
+
+ entry = radix_tree_deref_slot(slot);
+ if (unlikely(!entry))
+ continue;
+
+ if (radix_tree_deref_retry(entry)) {
+ slot = radix_tree_iter_retry(&iter);
+ continue;
+ }
+
+ if (rand() % 50 == 0)
+ slot = radix_tree_iter_next(&iter);
+ }
+ rcu_read_unlock();
+ }
+
+ return NULL;
+}
+
+/*
+ * Randomly remove entries to help induce radix_tree_iter_retry() calls in the
+ * two iteration functions.
+ */
+static void *remove_entries_fn(void *arg)
+{
+ while (!test_complete) {
+ int pgoff;
+
+ pgoff = rand() % 100;
+
+ pthread_mutex_lock(&tree_lock);
+ item_delete(&tree, pgoff);
+ pthread_mutex_unlock(&tree_lock);
+ }
+
+ return NULL;
+}
+
+/* This is a unit test for a bug found by the syzkaller tester */
+void iteration_test(void)
+{
+ int i;
+
+ printf("Running iteration tests for 10 seconds\n");
+
+ srand(time(0));
+ test_complete = false;
+
+ if (pthread_create(&threads[0], NULL, tagged_iteration_fn, NULL)) {
+ perror("pthread_create");
+ exit(1);
+ }
+ if (pthread_create(&threads[1], NULL, untagged_iteration_fn, NULL)) {
+ perror("pthread_create");
+ exit(1);
+ }
+ if (pthread_create(&threads[2], NULL, add_entries_fn, NULL)) {
+ perror("pthread_create");
+ exit(1);
+ }
+ if (pthread_create(&threads[3], NULL, remove_entries_fn, NULL)) {
+ perror("pthread_create");
+ exit(1);
+ }
+
+ sleep(10);
+ test_complete = true;
+
+ for (i = 0; i < NUM_THREADS; i++) {
+ if (pthread_join(threads[i], NULL)) {
+ perror("pthread_join");
+ exit(1);
+ }
+ }
+
+ item_kill_tree(&tree);
+}
diff --git a/tools/testing/radix-tree/main.c b/tools/testing/radix-tree/main.c
index b7619ff3b552..daa9010693e8 100644
--- a/tools/testing/radix-tree/main.c
+++ b/tools/testing/radix-tree/main.c
@@ -332,6 +332,7 @@ int main(int argc, char **argv)
regression1_test();
regression2_test();
regression3_test();
+ iteration_test();
single_thread_tests(long_run);
sleep(1);
diff --git a/tools/testing/radix-tree/regression1.c b/tools/testing/radix-tree/regression1.c
index 2d03a63bb79c..0d6813a61b37 100644
--- a/tools/testing/radix-tree/regression1.c
+++ b/tools/testing/radix-tree/regression1.c
@@ -43,7 +43,7 @@
#include "regression.h"
static RADIX_TREE(mt_tree, GFP_KERNEL);
-static pthread_mutex_t mt_lock;
+static pthread_mutex_t mt_lock = PTHREAD_MUTEX_INITIALIZER;
struct page {
pthread_mutex_t lock;
diff --git a/tools/testing/radix-tree/test.h b/tools/testing/radix-tree/test.h
index e85131369723..217fb2403f09 100644
--- a/tools/testing/radix-tree/test.h
+++ b/tools/testing/radix-tree/test.h
@@ -27,6 +27,7 @@ void item_kill_tree(struct radix_tree_root *root);
void tag_check(void);
void multiorder_checks(void);
+void iteration_test(void);
struct item *
item_tag_set(struct radix_tree_root *root, unsigned long index, int tag);