[compiler-rt] r225323 - [asan] add a flag soft_rss_limit_mb
Jay Foad
jay.foad at gmail.com
Fri Jan 9 01:03:49 PST 2015
Hi Kostya,
This commit seems to be causing a bunch of failures in check-asan on
PowerPC64 Linux, using GCC 4.8.3 as the host compiler:
Failing Tests (80):
AddressSanitizer64 :: TestCases/Linux/coverage-caller-callee-total-count.cc
AddressSanitizer64 :: TestCases/Linux/coverage-caller-callee.cc
AddressSanitizer64 :: TestCases/Linux/coverage-direct-activation.cc
AddressSanitizer64 :: TestCases/Linux/coverage-direct-large.cc
AddressSanitizer64 :: TestCases/Linux/coverage-direct.cc
AddressSanitizer64 :: TestCases/Linux/coverage-module-unloaded.cc
AddressSanitizer64 :: TestCases/Linux/function-sections-are-bad.cc
AddressSanitizer64 :: TestCases/Linux/interception_malloc_test.cc
AddressSanitizer64 :: TestCases/Linux/interception_readdir_r_test.cc
AddressSanitizer64 :: TestCases/Linux/interception_test.cc
AddressSanitizer64 :: TestCases/Linux/malloc_delete_mismatch.cc
AddressSanitizer64 :: TestCases/Linux/sized_delete_test.cc
AddressSanitizer64 :: TestCases/Linux/stack-trace-dlclose.cc
AddressSanitizer64 :: TestCases/Linux/stress_dtls.c
AddressSanitizer64 :: TestCases/Linux/uar_signals.cc
AddressSanitizer64 :: TestCases/Posix/asan-symbolize-sanity-test.cc
AddressSanitizer64 :: TestCases/Posix/asprintf.cc
AddressSanitizer64 :: TestCases/Posix/assign_large_valloc_to_global.cc
AddressSanitizer64 :: TestCases/Posix/glob.cc
AddressSanitizer64 :: TestCases/Posix/init-order-dlopen.cc
AddressSanitizer64 :: TestCases/Posix/large_allocator_unpoisons_on_free.cc
AddressSanitizer64 :: TestCases/Posix/new_array_cookie_test.cc
AddressSanitizer64 :: TestCases/Posix/new_array_cookie_uaf_test.cc
AddressSanitizer64 ::
TestCases/Posix/new_array_cookie_with_new_from_class.cc
AddressSanitizer64 :: TestCases/Posix/shared-lib-test.cc
AddressSanitizer64 :: TestCases/Posix/start-deactivated.cc
AddressSanitizer64 :: TestCases/Posix/tsd_dtor_leak.cc
AddressSanitizer64 :: TestCases/allocator_returns_null.cc
AddressSanitizer64 :: TestCases/asan_and_llvm_coverage_test.cc
AddressSanitizer64 :: TestCases/atexit_stats.cc
AddressSanitizer64 :: TestCases/contiguous_container.cc
AddressSanitizer64 :: TestCases/current_allocated_bytes.cc
AddressSanitizer64 :: TestCases/debug_locate.cc
AddressSanitizer64 :: TestCases/debug_report.cc
AddressSanitizer64 :: TestCases/debug_stacks.cc
AddressSanitizer64 :: TestCases/deep_stack_uaf.cc
AddressSanitizer64 :: TestCases/deep_thread_stack.cc
AddressSanitizer64 :: TestCases/describe_address.cc
AddressSanitizer64 :: TestCases/double-free.cc
AddressSanitizer64 :: TestCases/free_hook_realloc.cc
AddressSanitizer64 :: TestCases/frexp_interceptor.cc
AddressSanitizer64 :: TestCases/gc-test.cc
AddressSanitizer64 :: TestCases/heap-overflow-large.cc
AddressSanitizer64 :: TestCases/heap-overflow.cc
AddressSanitizer64 :: TestCases/huge_negative_hea_oob.cc
AddressSanitizer64 :: TestCases/init-order-pthread-create.cc
AddressSanitizer64 :: TestCases/inline.cc
AddressSanitizer64 :: TestCases/interception_failure_test.cc
AddressSanitizer64 :: TestCases/intra-object-overflow.cc
AddressSanitizer64 :: TestCases/invalid-free.cc
AddressSanitizer64 :: TestCases/large_func_test.cc
AddressSanitizer64 :: TestCases/log-path_test.cc
AddressSanitizer64 :: TestCases/lsan_annotations.cc
AddressSanitizer64 :: TestCases/malloc_context_size.cc
AddressSanitizer64 :: TestCases/malloc_fill.cc
AddressSanitizer64 :: TestCases/max_redzone.cc
AddressSanitizer64 :: TestCases/memset_test.cc
AddressSanitizer64 :: TestCases/on_error_callback.cc
AddressSanitizer64 :: TestCases/partial_right.cc
AddressSanitizer64 :: TestCases/poison_partial.cc
AddressSanitizer64 :: TestCases/print_summary.cc
AddressSanitizer64 :: TestCases/printf-2.c
AddressSanitizer64 :: TestCases/sanity_check_pure_c.c
AddressSanitizer64 :: TestCases/stack-overflow.cc
AddressSanitizer64 :: TestCases/stack-use-after-return.cc
AddressSanitizer64 :: TestCases/strdup_oob_test.cc
AddressSanitizer64 :: TestCases/strip_path_prefix.c
AddressSanitizer64 :: TestCases/suppressions-function.cc
AddressSanitizer64 :: TestCases/suppressions-interceptor.cc
AddressSanitizer64 :: TestCases/suppressions-library.cc
AddressSanitizer64 :: TestCases/throw_call_test.cc
AddressSanitizer64 :: TestCases/throw_catch.cc
AddressSanitizer64 :: TestCases/throw_invoke_test.cc
AddressSanitizer64 :: TestCases/time_interceptor.cc
AddressSanitizer64 :: TestCases/uar_and_exceptions.cc
AddressSanitizer64 :: TestCases/unaligned_loads_and_stores.cc
AddressSanitizer64 :: TestCases/use-after-delete.cc
AddressSanitizer64 :: TestCases/use-after-free-right.cc
AddressSanitizer64 :: TestCases/use-after-free.cc
AddressSanitizer64 :: TestCases/use-after-poison.cc
Expected Passes : 63
Expected Failures : 6
Unsupported Tests : 107
Unexpected Failures: 80
Many (all?) of the failing tests print this:
==58738==AddressSanitizer CHECK failed:
/home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang_other.h:28
"((mo & (memory_order_relaxed | memory_order_consume |
memory_order_acquire | memory_order_seq_cst))) != (0)" (0x0, 0x0)
Here's a call stack at the point of failure.
(gdb) bt
#0 __sanitizer::CheckFailed (
file=0x100f8c88
"/home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang_other.h",
line=28,
cond=0x100f96e8 "((mo & (memory_order_relaxed |
memory_order_consume | memory_order_acquire | memory_order_seq_cst)))
!= (0)", v1=0, v2=0)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_common.cc:123
#1 0x0000000010024b90 in atomic_load<__sanitizer::atomic_uint8_t> (
mo=__sanitizer::memory_order_release,
a=0x1034a249 <__asan::instance+2097793>)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang_other.h:27
#2 RssLimitIsExceeded (this=0x10149fc8 <__asan::instance>)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_allocator.h:1321
#3 Allocate (check_rss_limit=true, cleared=false, alignment=8,
size=<optimized out>, cache=<optimized out>,
this=0x10149fc8 <__asan::instance>)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_allocator.h:1288
#4 __asan::Allocator::Allocate (this=0x10149fc8 <__asan::instance>,
size=<optimized out>, alignment=<optimized out>, stack=0x3fffffffdfe0,
alloc_type=<optimized out>, can_fill=<optimized out>)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/asan_allocator.cc:368
#5 0x00000000100f6208 in operator new (size=154)
at /home/foad/llvm-project/llvm/projects/compiler-rt/lib/asan/asan_new_delete.cc:62
#6 0x00003fffb7ebbf34 in .std::string::_Rep::_S_create(unsigned long,
unsigned long, std::allocator<char> const&) () from
/lib64/libstdc++.so.6
#7 0x00003fffb7ebed10 in .char* std::string::_S_construct<char
const*>(char const*, char const*, std::allocator<char> const&,
std::forward_iterator_tag) ()
from /lib64/libstdc++.so.6
#8 0x00003fffb7ebf4e8 in .std::basic_string<char,
std::char_traits<char>, std::allocator<char> >::basic_string(char
const*, std::allocator<char> const&) ()
from /lib64/libstdc++.so.6
#9 0x00000000100f76ec in .main ()
at /home/foad/llvm-project/llvm/projects/compiler-rt/test/asan/TestCases/Posix/asan-symbolize-sanity-test.cc:25
Thanks,
Jay.
On 6 January 2015 at 23:53, Kostya Serebryany <kcc at google.com> wrote:
> Author: kcc
> Date: Tue Jan 6 17:53:32 2015
> New Revision: 225323
>
> URL: http://llvm.org/viewvc/llvm-project?rev=225323&view=rev
> Log:
> [asan] add a flag soft_rss_limit_mb
>
> Added:
> compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/soft_rss_limit_mb_test.cc
> Modified:
> compiler-rt/trunk/lib/asan/asan_allocator.cc
> compiler-rt/trunk/lib/asan/asan_allocator.h
> compiler-rt/trunk/lib/asan/asan_rtl.cc
> compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.h
> compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
> compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_libcdep.cc
> compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
> compiler-rt/trunk/lib/sanitizer_common/sanitizer_quarantine.h
>
> Modified: compiler-rt/trunk/lib/asan/asan_allocator.cc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_allocator.cc?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/asan/asan_allocator.cc (original)
> +++ compiler-rt/trunk/lib/asan/asan_allocator.cc Tue Jan 6 17:53:32 2015
> @@ -361,15 +361,21 @@ struct Allocator {
>
> AsanThread *t = GetCurrentThread();
> void *allocated;
> + bool check_rss_limit = true;
> if (t) {
> AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
> - allocated = allocator.Allocate(cache, needed_size, 8, false);
> + allocated =
> + allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
> } else {
> SpinMutexLock l(&fallback_mutex);
> AllocatorCache *cache = &fallback_allocator_cache;
> - allocated = allocator.Allocate(cache, needed_size, 8, false);
> + allocated =
> + allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
> }
>
> + if (!allocated)
> + return allocator.ReturnNullOrDie();
> +
> if (*(u8 *)MEM_TO_SHADOW((uptr)allocated) == 0 && CanPoisonMemory()) {
> // Heap poisoning is enabled, but the allocator provides an unpoisoned
> // chunk. This is possible if CanPoisonMemory() was false for some
> @@ -771,6 +777,10 @@ void asan_mz_force_unlock() {
> instance.ForceUnlock();
> }
>
> +void AsanSoftRssLimitExceededCallback(bool exceeded) {
> + instance.allocator.SetRssLimitIsExceeded(exceeded);
> +}
> +
> } // namespace __asan
>
> // --- Implementation of LSan-specific functions --- {{{1
>
> Modified: compiler-rt/trunk/lib/asan/asan_allocator.h
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_allocator.h?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/asan/asan_allocator.h (original)
> +++ compiler-rt/trunk/lib/asan/asan_allocator.h Tue Jan 6 17:53:32 2015
> @@ -173,6 +173,7 @@ void asan_mz_force_lock();
> void asan_mz_force_unlock();
>
> void PrintInternalAllocatorStats();
> +void AsanSoftRssLimitExceededCallback(bool exceeded);
>
> } // namespace __asan
> #endif // ASAN_ALLOCATOR_H
>
> Modified: compiler-rt/trunk/lib/asan/asan_rtl.cc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_rtl.cc?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/asan/asan_rtl.cc (original)
> +++ compiler-rt/trunk/lib/asan/asan_rtl.cc Tue Jan 6 17:53:32 2015
> @@ -396,6 +396,7 @@ static void AsanInitInternal() {
> InitializeAllocator(allocator_options);
>
> MaybeStartBackgroudThread();
> + SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
>
> // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
> // should be set to 1 prior to initializing the threads.
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.h
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.h?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.h (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.h Tue Jan 6 17:53:32 2015
> @@ -1279,12 +1279,14 @@ class CombinedAllocator {
> }
>
> void *Allocate(AllocatorCache *cache, uptr size, uptr alignment,
> - bool cleared = false) {
> + bool cleared = false, bool check_rss_limit = false) {
> // Returning 0 on malloc(0) may break a lot of code.
> if (size == 0)
> size = 1;
> if (size + alignment < size)
> return ReturnNullOrDie();
> + if (check_rss_limit && RssLimitIsExceeded())
> + return ReturnNullOrDie();
> if (alignment > 8)
> size = RoundUpTo(size, alignment);
> void *res;
> @@ -1315,6 +1317,15 @@ class CombinedAllocator {
> atomic_store(&may_return_null_, may_return_null, memory_order_release);
> }
>
> + bool RssLimitIsExceeded() {
> + return atomic_load(&rss_limit_is_exceeded_, memory_order_release);
> + }
> +
> + void SetRssLimitIsExceeded(bool rss_limit_is_exceeded) {
> + atomic_store(&rss_limit_is_exceeded_, rss_limit_is_exceeded,
> + memory_order_release);
> + }
> +
> void Deallocate(AllocatorCache *cache, void *p) {
> if (!p) return;
> if (primary_.PointerIsMine(p))
> @@ -1428,6 +1439,7 @@ class CombinedAllocator {
> SecondaryAllocator secondary_;
> AllocatorGlobalStats stats_;
> atomic_uint8_t may_return_null_;
> + atomic_uint8_t rss_limit_is_exceeded_;
> };
>
> // Returns true if calloc(size, n) should return 0 due to overflow in size*n.
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_common.h Tue Jan 6 17:53:32 2015
> @@ -254,6 +254,12 @@ typedef void (*CheckFailedCallbackType)(
> u64, u64);
> void SetCheckFailedCallback(CheckFailedCallbackType callback);
>
> +// Callback will be called if soft_rss_limit_mb is given and the limit is
> +// exceeded (exceeded==true) or if rss went down below the limit
> +// (exceeded==false).
> +// The callback should be registered once at the tool init time.
> +void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded));
> +
> // Functions related to signal handling.
> typedef void (*SignalHandlerType)(int, void *, void *);
> bool IsDeadlySignal(int signum);
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_libcdep.cc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_libcdep.cc?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_libcdep.cc (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_libcdep.cc Tue Jan 6 17:53:32 2015
> @@ -60,10 +60,18 @@ void ReportErrorSummary(const char *erro
> #endif
> }
>
> +static void (*SoftRssLimitExceededCallback)(bool exceeded);
> +void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) {
> + CHECK_EQ(SoftRssLimitExceededCallback, nullptr);
> + SoftRssLimitExceededCallback = Callback;
> +}
> +
> void BackgroundThread(void *arg) {
> uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb;
> + uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb;
> uptr prev_reported_rss = 0;
> uptr prev_reported_stack_depot_size = 0;
> + bool reached_soft_rss_limit = false;
> while (true) {
> SleepForMillis(100);
> uptr current_rss_mb = GetRSS() >> 20;
> @@ -91,13 +99,28 @@ void BackgroundThread(void *arg) {
> DumpProcessMap();
> Die();
> }
> + if (soft_rss_limit_mb) {
> + if (soft_rss_limit_mb < current_rss_mb && !reached_soft_rss_limit) {
> + reached_soft_rss_limit = true;
> + Report("%s: soft rss limit exhausted (%zdMb vs %zdMb)\n",
> + SanitizerToolName, soft_rss_limit_mb, current_rss_mb);
> + if (SoftRssLimitExceededCallback)
> + SoftRssLimitExceededCallback(true);
> + } else if (soft_rss_limit_mb >= current_rss_mb &&
> + reached_soft_rss_limit) {
> + reached_soft_rss_limit = false;
> + if (SoftRssLimitExceededCallback)
> + SoftRssLimitExceededCallback(false);
> + }
> + }
> }
> }
>
> void MaybeStartBackgroudThread() {
> if (!SANITIZER_LINUX) return; // Need to implement/test on other platforms.
> - // Currently, only start the background thread if hard_rss_limit_mb is given.
> - if (!common_flags()->hard_rss_limit_mb) return;
> + // Start the background thread if one of the rss limits is given.
> + if (!common_flags()->hard_rss_limit_mb &&
> + !common_flags()->soft_rss_limit_mb) return;
> if (!real_pthread_create) return; // Can't spawn the thread anyway.
> internal_start_thread(BackgroundThread, nullptr);
> }
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc Tue Jan 6 17:53:32 2015
> @@ -91,10 +91,19 @@ COMMON_FLAG(uptr, mmap_limit_mb, 0,
> "Limit the amount of mmap-ed memory (excluding shadow) in Mb; "
> "not a user-facing flag, used mosly for testing the tools")
> COMMON_FLAG(uptr, hard_rss_limit_mb, 0,
> - "RSS limit in Mb."
> + "Hard RSS limit in Mb."
> " If non-zero, a background thread is spawned at startup"
> " which periodically reads RSS and aborts the process if the"
> " limit is reached")
> +COMMON_FLAG(uptr, soft_rss_limit_mb, 0,
> + "Soft RSS limit in Mb."
> + " If non-zero, a background thread is spawned at startup"
> + " which periodically reads RSS. If the limit is reached"
> + " all subsequent malloc/new calls will fail or return NULL"
> + " (depending on the value of allocator_may_return_null)"
> + " until the RSS goes below the soft limit."
> + " This limit does not affect memory allocations other than"
> + " malloc/new.")
> COMMON_FLAG(
> bool, coverage, false,
> "If set, coverage information will be dumped at program shutdown (if the "
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_quarantine.h
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_quarantine.h?rev=225323&r1=225322&r2=225323&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_quarantine.h (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_quarantine.h Tue Jan 6 17:53:32 2015
> @@ -134,6 +134,7 @@ class QuarantineCache {
> size += sizeof(QuarantineBatch); // Count the batch in Quarantine size.
> }
> QuarantineBatch *b = list_.back();
> + CHECK(b);
> b->batch[b->count++] = ptr;
> b->size += size;
> SizeAdd(size);
> @@ -172,6 +173,7 @@ class QuarantineCache {
>
> NOINLINE QuarantineBatch* AllocBatch(Callback cb) {
> QuarantineBatch *b = (QuarantineBatch *)cb.Allocate(sizeof(*b));
> + CHECK(b);
> b->count = 0;
> b->size = 0;
> list_.push_back(b);
>
> Added: compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/soft_rss_limit_mb_test.cc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/soft_rss_limit_mb_test.cc?rev=225323&view=auto
> ==============================================================================
> --- compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/soft_rss_limit_mb_test.cc (added)
> +++ compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/soft_rss_limit_mb_test.cc Tue Jan 6 17:53:32 2015
> @@ -0,0 +1,62 @@
> +// Check soft_rss_limit_mb. Not all sanitizers implement it yet.
> +// RUN: %clangxx -O2 %s -o %t
> +//
> +// Run with limit should fail:
> +// RUN: %tool_options=soft_rss_limit_mb=400:quarantine_size=1:allocator_may_return_null=1 %run %t 2>&1 | FileCheck %s -check-prefix=CHECK_MAY_RETURN_1
> +// RUN: %tool_options=soft_rss_limit_mb=400:quarantine_size=1:allocator_may_return_null=0 not %run %t 2>&1 | FileCheck %s -check-prefix=CHECK_MAY_RETURN_0
> +
> +// FIXME: make it work for other sanitizers.
> +// XFAIL: lsan
> +// XFAIL: tsan
> +// XFAIL: msan
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <string.h>
> +#include <unistd.h>
> +
> +static const int kMaxNumAllocs = 1 << 10;
> +static const int kAllocSize = 1 << 20; // Large enough to go vi mmap.
> +
> +static char *allocs[kMaxNumAllocs];
> +
> +int main() {
> + int num_allocs = kMaxNumAllocs / 4;
> + for (int i = 0; i < 3; i++, num_allocs *= 2) {
> + fprintf(stderr, "[%d] allocating %d times\n", i, num_allocs);
> + int zero_results = 0;
> + for (int j = 0; j < num_allocs; j++) {
> + if ((j % (num_allocs / 4)) == 0) {
> + usleep(100000);
> + fprintf(stderr, " [%d]\n", j);
> + }
> + allocs[j] = (char*)malloc(kAllocSize);
> + if (allocs[j])
> + memset(allocs[j], -1, kAllocSize);
> + else
> + zero_results++;
> + }
> + if (zero_results)
> + fprintf(stderr, "Some of the malloc calls returned null: %d\n",
> + zero_results);
> + if (zero_results != num_allocs)
> + fprintf(stderr, "Some of the malloc calls returned non-null: %d\n",
> + num_allocs - zero_results);
> + for (int j = 0; j < num_allocs; j++) {
> + free(allocs[j]);
> + }
> + }
> +}
> +
> +// CHECK_MAY_RETURN_1: allocating 256 times
> +// CHECK_MAY_RETURN_1: Some of the malloc calls returned non-null: 256
> +// CHECK_MAY_RETURN_1: allocating 512 times
> +// CHECK_MAY_RETURN_1: Some of the malloc calls returned null:
> +// CHECK_MAY_RETURN_1: Some of the malloc calls returned non-null:
> +// CHECK_MAY_RETURN_1: allocating 1024 times
> +// CHECK_MAY_RETURN_1: Some of the malloc calls returned null:
> +// CHECK_MAY_RETURN_1: Some of the malloc calls returned non-null:
> +
> +// CHECK_MAY_RETURN_0: allocating 256 times
> +// CHECK_MAY_RETURN_0: Some of the malloc calls returned non-null: 256
> +// CHECK_MAY_RETURN_0: allocating 512 times
> +// CHECK_MAY_RETURN_0: allocator is terminating the process instead of returning
>
>
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