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[test][hwasan] Deflake release-shadow.c

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kNumShadowPages=1024 helps to pass it consistenly (10k runs).
But to be sure also changing success condition to 8 out of 10.
This commit is contained in:
Vitaly Buka 2023-11-21 19:25:31 -08:00
parent 3af586f797
commit 2c875719c8
1 changed files with 14 additions and 8 deletions
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22
compiler-rt/test/hwasan/TestCases/Linux/release-shadow.c
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@ -15,7 +15,7 @@
#include <sanitizer/hwasan_interface.h>
const unsigned char kTag = 42;
const size_t kNumShadowPages = 256;
const size_t kNumShadowPages = 1024;
const size_t kNumPages = 16 * kNumShadowPages;
const size_t kPageSize = 4096;
const size_t kMapSize = kNumPages * kPageSize;
@ -23,7 +23,7 @@ const size_t kMapSize = kNumPages * kPageSize;
void sync_rss() {
char *page = (char *)mmap(0, kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
// Linux kernel updates RSS counters after a set number of page faults.
for (int i = 0; i < 10000; ++i) {
for (int i = 0; i < 100; ++i) {
page[0] = 42;
madvise(page, kPageSize, MADV_DONTNEED);
}
@ -44,17 +44,18 @@ size_t current_rss() {
return rss;
}
void test_rss_difference(void *p) {
int test_rss_difference(void *p) {
__hwasan_tag_memory(p, kTag, kMapSize);
size_t rss_before = current_rss();
__hwasan_tag_memory(p, 0, kMapSize);
size_t rss_after = current_rss();
fprintf(stderr, "%zu -> %zu\n", rss_before, rss_after);
assert(rss_before > rss_after);
if (rss_before <= rss_after)
return 0;
size_t diff = rss_before - rss_after;
fprintf(stderr, "diff %zu\n", diff);
// Check that the difference is at least close to kNumShadowPages.
assert(diff > kNumShadowPages / 2);
return diff > kNumShadowPages / 2;
}
int main() {
@ -64,9 +65,14 @@ int main() {
void *p = mmap(0, kMapSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
fprintf(stderr, "p = %p\n", p);
test_rss_difference(p);
test_rss_difference(p);
test_rss_difference(p);
size_t total_count = 10;
size_t success_count = 0;
for (size_t i = 0; i < total_count; ++i)
success_count += test_rss_difference(p);
fprintf(stderr, "p = %p\n", p);
fprintf(stderr, "passed %zu out of %zu\n", success_count, total_count);
assert(success_count > total_count * 0.8);
return 0;
}