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0dd1979f7f
Commit a2408a7036 ("perf evlist: Maintain evlist->all_cpus")
introduces a test case for cpumap merge operation, see functions
perf_cpu_map__merge() and test__cpu_map_merge().
The test case fails on s390 with this error message:
[root@m35lp76 perf]# ./perf test -Fvvvvv 52
52: Merge cpu map :
--- start ---
cpumask list: 1-2,4-5,7
perf: /root/linux/tools/include/linux/refcount.h:131:\
refcount_sub_and_test: Assertion `!(new > val)' failed.
Aborted (core dumped)
[root@m35lp76 perf]#
The root cause is in the function test__cpu_map_merge():
It creates two cpu_maps named 'a' and 'b':
struct perf_cpu_map *a = perf_cpu_map__new("4,2,1");
struct perf_cpu_map *b = perf_cpu_map__new("4,5,7");
and creates a third map named 'c' which is the result of
the merge of maps a and b:
struct perf_cpu_map *c = perf_cpu_map__merge(a, b);
After some verifaction of the merged cpu_map all three
of them are have their reference count reduced and are
freed:
perf_cpu_map__put(a); (1)
perf_cpu_map__put(b);
perf_cpu_map__put(c);
The release of perf_cpu_map__put(a) is wrong. The map
is already released and free'ed as part of the function
perf_cpu_map__merge(struct perf_cpu_map *orig,
| struct perf_cpu_map *other)
+--> perf_cpu_map__put(orig);
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+--> cpu_map__delete(orig)
At the end perf_cpu_map_put() is called for map 'orig'
alias 'a' and since the reference count is 1, the map
is deleted, as can be seen by the following gdb trace:
(gdb) where
#0 tcache_put (tc_idx=0, chunk=0x156cc30) at malloc.c:2940
#1 _int_free (av=0x3fffd49ee80 <main_arena>, p=0x156cc30,
have_lock=<optimized out>) at malloc.c:4222
#2 0x00000000012d5e78 in cpu_map__delete (map=0x156cc40) at cpumap.c:31
#3 0x00000000012d5f7a in perf_cpu_map__put (map=0x156cc40) at cpumap.c:45
#4 0x00000000012d723a in perf_cpu_map__merge (orig=0x156cc40,
other=0x156cc60) at cpumap.c:343
#5 0x000000000110cdd0 in test__cpu_map_merge (
test=0x14ea6c8 <generic_tests+2856>, subtest=-1) at tests/cpumap.c:128
Thus the perf_cpu_map__put(a) (see (1) above) frees map 'a'
a second time and causes the failure. Fix this be removing that
function call.
Output after:
[root@m35lp76 perf]# ./perf test -Fvvvvv 52
52: Merge cpu map :
--- start ---
cpumask list: 1-2,4-5,7
---- end ----
Merge cpu map: Ok
[root@m35lp76 perf]#
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: sumanthk@linux.ibm.com
Link: http://lore.kernel.org/lkml/20200120132011.64698-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "tests.h"
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#include <stdio.h>
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#include "cpumap.h"
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#include "event.h"
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#include "util/synthetic-events.h"
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#include <string.h>
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#include <linux/bitops.h>
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#include <perf/cpumap.h>
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#include "debug.h"
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struct machine;
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static int process_event_mask(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused,
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struct machine *machine __maybe_unused)
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{
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struct perf_record_cpu_map *map_event = &event->cpu_map;
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struct perf_record_record_cpu_map *mask;
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struct perf_record_cpu_map_data *data;
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struct perf_cpu_map *map;
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int i;
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data = &map_event->data;
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TEST_ASSERT_VAL("wrong type", data->type == PERF_CPU_MAP__MASK);
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mask = (struct perf_record_record_cpu_map *)data->data;
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TEST_ASSERT_VAL("wrong nr", mask->nr == 1);
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for (i = 0; i < 20; i++) {
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TEST_ASSERT_VAL("wrong cpu", test_bit(i, mask->mask));
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}
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map = cpu_map__new_data(data);
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TEST_ASSERT_VAL("wrong nr", map->nr == 20);
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for (i = 0; i < 20; i++) {
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TEST_ASSERT_VAL("wrong cpu", map->map[i] == i);
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}
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perf_cpu_map__put(map);
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return 0;
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}
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static int process_event_cpus(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused,
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struct machine *machine __maybe_unused)
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{
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struct perf_record_cpu_map *map_event = &event->cpu_map;
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struct cpu_map_entries *cpus;
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struct perf_record_cpu_map_data *data;
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struct perf_cpu_map *map;
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data = &map_event->data;
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TEST_ASSERT_VAL("wrong type", data->type == PERF_CPU_MAP__CPUS);
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cpus = (struct cpu_map_entries *)data->data;
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TEST_ASSERT_VAL("wrong nr", cpus->nr == 2);
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TEST_ASSERT_VAL("wrong cpu", cpus->cpu[0] == 1);
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TEST_ASSERT_VAL("wrong cpu", cpus->cpu[1] == 256);
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map = cpu_map__new_data(data);
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TEST_ASSERT_VAL("wrong nr", map->nr == 2);
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TEST_ASSERT_VAL("wrong cpu", map->map[0] == 1);
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TEST_ASSERT_VAL("wrong cpu", map->map[1] == 256);
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TEST_ASSERT_VAL("wrong refcnt", refcount_read(&map->refcnt) == 1);
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perf_cpu_map__put(map);
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return 0;
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}
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int test__cpu_map_synthesize(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct perf_cpu_map *cpus;
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/* This one is better stores in mask. */
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cpus = perf_cpu_map__new("0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19");
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TEST_ASSERT_VAL("failed to synthesize map",
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!perf_event__synthesize_cpu_map(NULL, cpus, process_event_mask, NULL));
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perf_cpu_map__put(cpus);
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/* This one is better stores in cpu values. */
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cpus = perf_cpu_map__new("1,256");
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TEST_ASSERT_VAL("failed to synthesize map",
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!perf_event__synthesize_cpu_map(NULL, cpus, process_event_cpus, NULL));
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perf_cpu_map__put(cpus);
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return 0;
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}
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static int cpu_map_print(const char *str)
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{
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struct perf_cpu_map *map = perf_cpu_map__new(str);
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char buf[100];
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if (!map)
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return -1;
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cpu_map__snprint(map, buf, sizeof(buf));
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return !strcmp(buf, str);
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}
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int test__cpu_map_print(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1,5"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1,3,5,7,9,11,13,15,17,19,21-40"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("2-5"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1,3-6,8-10,24,35-37"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1,3-6,8-10,24,35-37"));
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TEST_ASSERT_VAL("failed to convert map", cpu_map_print("1-10,12-20,22-30,32-40"));
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return 0;
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}
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int test__cpu_map_merge(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct perf_cpu_map *a = perf_cpu_map__new("4,2,1");
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struct perf_cpu_map *b = perf_cpu_map__new("4,5,7");
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struct perf_cpu_map *c = perf_cpu_map__merge(a, b);
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char buf[100];
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TEST_ASSERT_VAL("failed to merge map: bad nr", c->nr == 5);
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cpu_map__snprint(c, buf, sizeof(buf));
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TEST_ASSERT_VAL("failed to merge map: bad result", !strcmp(buf, "1-2,4-5,7"));
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perf_cpu_map__put(b);
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perf_cpu_map__put(c);
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return 0;
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}
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