[LSan] Report proper error on allocator failures instead of CHECK(0)-ing

[alekseyshl]

Summary

Following up on and complementing D44404.

Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, not stack, no details, not too
helpful nor informative. To improve the situation, detailed and
structured errors were defined and reported under the appropriate conditions.

[alekseyshl]

• Move allocator errors reporting to common to share with other sanitizers.

[eugenis]

Looks great.

lib/lsan/lsan_allocator.cc

 //
 //===----------------------------------------------------------------------===//
 
 #include "lsan_allocator.h"
 
 #include "sanitizer_common/sanitizer_allocator.h"
 #include "sanitizer_common/sanitizer_allocator_checks.h"
 #include "sanitizer_common/sanitizer_allocator_interface.h"
+#include "sanitizer_common/sanitizer_allocator_report.h"
 #include "sanitizer_common/sanitizer_errno.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
 #include "sanitizer_common/sanitizer_stacktrace.h"
 #include "lsan_common.h"
 
 extern "C" void *memset(void *ptr, int value, uptr num);
 

 
 static void RegisterDeallocation(void *p) {
   if (!p) return;
   ChunkMetadata *m = Metadata(p);
   CHECK(m);
   atomic_store(reinterpret_cast<atomic_uint8_t *>(m), 0, memory_order_relaxed);
 }
 
+static void *ReportAllocationSizeTooBig(uptr size, const StackTrace &stack) {
+  if (AllocatorMayReturnNull()) {
+    Report("WARNING: LeakSanitizer failed to allocate 0x%zx bytes\n", size);
+    return nullptr;
+  }
+  ReportAllocationSizeTooBig(size, kMaxAllowedMallocSize, &stack);
+}
+
 void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
                bool cleared) {
   if (size == 0)
     size = 1;
-  if (size > kMaxAllowedMallocSize) {
-    Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", size);
-    return ReturnNullOrDieOnFailure::OnBadRequest();
-  }
+  if (size > kMaxAllowedMallocSize)
+    return ReportAllocationSizeTooBig(size, stack);
   void *p = allocator.Allocate(GetAllocatorCache(), size, alignment);
-  if (UNLIKELY(!p))
-    return ReturnNullOrDieOnFailure::OnOOM();
+  if (UNLIKELY(!p)) {
+    SetAllocatorOutOfMemory();
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportOutOfMemory(size, &stack);
+  }
   // Do not rely on the allocator to clear the memory (it's slow).
   if (cleared && allocator.FromPrimary(p))
     memset(p, 0, size);
   RegisterAllocation(stack, p, size);
   if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(p, size);
   RunMallocHooks(p, size);
   return p;
 }
 
 static void *Calloc(uptr nmemb, uptr size, const StackTrace &stack) {
-  if (UNLIKELY(CheckForCallocOverflow(size, nmemb)))
-    return ReturnNullOrDieOnFailure::OnBadRequest();
+  if (UNLIKELY(CheckForCallocOverflow(size, nmemb))) {
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportCallocOverflow(nmemb, size, &stack);
+  }
   size *= nmemb;
   return Allocate(stack, size, 1, true);
 }
 
 void Deallocate(void *p) {
   if (&__sanitizer_free_hook) __sanitizer_free_hook(p);
   RunFreeHooks(p);
   RegisterDeallocation(p);
   allocator.Deallocate(GetAllocatorCache(), p);
 }
 
 void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
                  uptr alignment) {
   RegisterDeallocation(p);
   if (new_size > kMaxAllowedMallocSize) {
-    Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", new_size);
     allocator.Deallocate(GetAllocatorCache(), p);
-    return ReturnNullOrDieOnFailure::OnBadRequest();
+    return ReportAllocationSizeTooBig(new_size, stack);
   }
   p = allocator.Reallocate(GetAllocatorCache(), p, new_size, alignment);
   RegisterAllocation(stack, p, new_size);
   return p;
 }
 
 void GetAllocatorCacheRange(uptr *begin, uptr *end) {
   *begin = (uptr)GetAllocatorCache();
   *end = *begin + sizeof(AllocatorCache);
 }
 
 uptr GetMallocUsableSize(const void *p) {
   ChunkMetadata *m = Metadata(p);
   if (!m) return 0;
   return m->requested_size;
 }
 
 int lsan_posix_memalign(void **memptr, uptr alignment, uptr size,
                         const StackTrace &stack) {
   if (UNLIKELY(!CheckPosixMemalignAlignment(alignment))) {
-    ReturnNullOrDieOnFailure::OnBadRequest();
+    if (AllocatorMayReturnNull())
       return errno_EINVAL;
+    ReportInvalidPosixMemalignAlignment(alignment, &stack);
   }
   void *ptr = Allocate(stack, size, alignment, kAlwaysClearMemory);
   if (UNLIKELY(!ptr))
     // OOM error is already taken care of by Allocate.
     return errno_ENOMEM;
   CHECK(IsAligned((uptr)ptr, alignment));
   *memptr = ptr;
   return 0;
 }
 
 void *lsan_memalign(uptr alignment, uptr size, const StackTrace &stack) {
   if (UNLIKELY(!IsPowerOfTwo(alignment))) {
     errno = errno_EINVAL;
-    return ReturnNullOrDieOnFailure::OnBadRequest();
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportInvalidAllocationAlignment(alignment, &stack);
   }
   return SetErrnoOnNull(Allocate(stack, size, alignment, kAlwaysClearMemory));
 }
 
 void *lsan_malloc(uptr size, const StackTrace &stack) {
   return SetErrnoOnNull(Allocate(stack, size, 1, kAlwaysClearMemory));
 }
 

lib/lsan/lsan_interceptors.cc

 //=-- lsan_interceptors.cc ------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of LeakSanitizer.
 // Interceptors for standalone LSan.
 //
 //===----------------------------------------------------------------------===//
 
 #include "interception/interception.h"
 #include "sanitizer_common/sanitizer_allocator.h"
+#include "sanitizer_common/sanitizer_allocator_report.h"
 #include "sanitizer_common/sanitizer_atomic.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
 #include "sanitizer_common/sanitizer_linux.h"
 #include "sanitizer_common/sanitizer_platform_interceptors.h"
 #include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
 #include "sanitizer_common/sanitizer_platform_limits_posix.h"

 
 INTERCEPTOR(int, mprobe, void *ptr) {
   return 0;
 }
 #endif // SANITIZER_INTERCEPT_MCHECK_MPROBE
 
 
 // TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
-#define OPERATOR_NEW_BODY(nothrow)                         \
-  ENSURE_LSAN_INITED;                                      \
-  GET_STACK_TRACE_MALLOC;                                  \
-  void *res = lsan_malloc(size, stack);                    \
-  if (!nothrow && UNLIKELY(!res)) DieOnFailure::OnOOM();   \
+#define OPERATOR_NEW_BODY(nothrow)\
+  ENSURE_LSAN_INITED;\
+  GET_STACK_TRACE_MALLOC;\
+  void *res = lsan_malloc(size, stack);\
+  if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
   return res;
-#define OPERATOR_NEW_BODY_ALIGN(nothrow)                   \
-  ENSURE_LSAN_INITED;                                      \
-  GET_STACK_TRACE_MALLOC;                                  \
-  void *res = lsan_memalign((uptr)align, size, stack);     \
-  if (!nothrow && UNLIKELY(!res)) DieOnFailure::OnOOM();   \
+#define OPERATOR_NEW_BODY_ALIGN(nothrow)\
+  ENSURE_LSAN_INITED;\
+  GET_STACK_TRACE_MALLOC;\
+  void *res = lsan_memalign((uptr)align, size, stack);\
+  if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
   return res;
 
-#define OPERATOR_DELETE_BODY \
-  ENSURE_LSAN_INITED;        \
+#define OPERATOR_DELETE_BODY\
+  ENSURE_LSAN_INITED;\
   lsan_free(ptr);
 
 // On OS X it's not enough to just provide our own 'operator new' and
 // 'operator delete' implementations, because they're going to be in the runtime
 // dylib, and the main executable will depend on both the runtime dylib and
 // libstdc++, each of has its implementation of new and delete.
 // To make sure that C++ allocation/deallocation operators are overridden on
 // OS X we need to intercept them using their mangled names.

lib/sanitizer_common/CMakeLists.txt

 
 set(SANITIZER_COVERAGE_SOURCES
   sancov_flags.cc
   sanitizer_coverage_fuchsia.cc
   sanitizer_coverage_libcdep_new.cc
   sanitizer_coverage_win_sections.cc)
 
 set(SANITIZER_SYMBOLIZER_SOURCES
+  sanitizer_allocator_report.cc
   sanitizer_stackdepot.cc
   sanitizer_stacktrace.cc
   sanitizer_stacktrace_libcdep.cc
   sanitizer_stacktrace_printer.cc
   sanitizer_stacktrace_sparc.cc
   sanitizer_symbolizer.cc
   sanitizer_symbolizer_libbacktrace.cc
   sanitizer_symbolizer_libcdep.cc
set(SANITIZER_HEADERS
   sanitizer_allocator.h
   sanitizer_allocator_bytemap.h
   sanitizer_allocator_combined.h
   sanitizer_allocator_interface.h
   sanitizer_allocator_internal.h
   sanitizer_allocator_local_cache.h
   sanitizer_allocator_primary32.h
   sanitizer_allocator_primary64.h
+  sanitizer_allocator_report.h
   sanitizer_allocator_secondary.h
   sanitizer_allocator_size_class_map.h
   sanitizer_allocator_stats.h
   sanitizer_atomic.h
   sanitizer_atomic_clang.h
   sanitizer_atomic_msvc.h
   sanitizer_bitvector.h
   sanitizer_bvgraph.h

lib/sanitizer_common/sanitizer_allocator_report.h

+//===-- sanitizer_allocator_report.h ----------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Shared allocator error reporting for ThreadSanitizer, MemorySanitizer, etc.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_ALLOCATOR_REPORT_H
+#define SANITIZER_ALLOCATOR_REPORT_H
+
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_stacktrace.h"
+
+namespace __sanitizer {
+
+void NORETURN ReportCallocOverflow(uptr count, uptr size,
+                                   const StackTrace *stack);
+void NORETURN ReportPvallocOverflow(uptr size, const StackTrace *stack);
+void NORETURN ReportInvalidAllocationAlignment(uptr alignment,
+                                               const StackTrace *stack);
+void NORETURN ReportInvalidAlignedAllocAlignment(uptr size, uptr alignment,
+                                                 const StackTrace *stack);
+void NORETURN ReportInvalidPosixMemalignAlignment(uptr alignment,
+                                                  const StackTrace *stack);
+void NORETURN ReportAllocationSizeTooBig(uptr user_size, uptr max_size,
+                                         const StackTrace *stack);
+void NORETURN ReportOutOfMemory(uptr requested_size, const StackTrace *stack);
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_ALLOCATOR_REPORT_H

lib/sanitizer_common/sanitizer_allocator_report.cc

+//===-- sanitizer_allocator_report.cc ---------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Shared allocator error reporting for ThreadSanitizer, MemorySanitizer, etc.
+///
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_allocator.h"
+#include "sanitizer_allocator_report.h"
+#include "sanitizer_common.h"
+#include "sanitizer_report_decorator.h"
+
+namespace __sanitizer {
+
+class ScopedAllocatorErrorReport {
+ public:
+  ScopedAllocatorErrorReport(const char *error_summary_,
+                             const StackTrace *stack_)
+      : error_summary(error_summary_),
+        stack(stack_) {
+    Printf("%s", d.Error());
+  }
+  ~ScopedAllocatorErrorReport() {
+    Printf("%s", d.Default());
+    stack->Print();
+    // TODO(alekseyshl): Define SanitizerToolOptionsEnvVarName and use it there.
+    PrintHintAllocatorCannotReturnNull("");
+    ReportErrorSummary(error_summary, stack);
+  }
+
+ private:
+  ScopedErrorReportLock lock;
+  const char *error_summary;
+  const StackTrace* const stack;
+  const SanitizerCommonDecorator d;
+};
+
+void NORETURN ReportCallocOverflow(uptr count, uptr size,
+                                   const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("calloc-overflow", stack);
+    Report("ERROR: %s: calloc parameters overflow: count * size (%zd * %zd) "
+           "cannot be represented in type size_t\n", SanitizerToolName, count,
+           size);
+  }
+  Die();
+}
+
+void NORETURN ReportPvallocOverflow(uptr size, const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("pvalloc-overflow", stack);
+    Report("ERROR: %s: pvalloc parameters overflow: size 0x%zx rounded up to "
+           "system page size 0x%zx cannot be represented in type size_t\n",
+           SanitizerToolName, size, GetPageSizeCached());
+  }
+  Die();
+}
+
+void NORETURN ReportInvalidAllocationAlignment(uptr alignment,
+                                               const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("invalid-allocation-alignment", stack);
+    Report("ERROR: %s: invalid allocation alignment: %zd, alignment must be a "
+           "power of two\n", SanitizerToolName, alignment);
+  }
+  Die();
+}
+
+void NORETURN ReportInvalidAlignedAllocAlignment(uptr size, uptr alignment,
+                                                 const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("invalid-aligned-alloc-alignment", stack);
+#if SANITIZER_POSIX
+    Report("ERROR: %s: invalid alignment requested in "
+           "aligned_alloc: %zd, alignment must be a power of two and the "
+           "requested size 0x%zx must be a multiple of alignment\n",
+           SanitizerToolName, alignment, size);
+#else
+    Report("ERROR: %s: invalid alignment requested in aligned_alloc: %zd, "
+           "the requested size 0x%zx must be a multiple of alignment\n",
+           SanitizerToolName, alignment, size);
+#endif
+  }
+  Die();
+}
+
+void NORETURN ReportInvalidPosixMemalignAlignment(uptr alignment,
+                                                  const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("invalid-posix-memalign-alignment",
+                                      stack);
+    Report("ERROR: %s: invalid alignment requested in "
+           "posix_memalign: %zd, alignment must be a power of two and a "
+           "multiple of sizeof(void*) == %zd\n", SanitizerToolName, alignment,
+           sizeof(void*));  // NOLINT
+  }
+  Die();
+}
+
+void NORETURN ReportAllocationSizeTooBig(uptr user_size, uptr max_size,
+                                         const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("allocation-size-too-big", stack);
+    Report("ERROR: %s: requested allocation size 0x%zx exceeds maximum "
+           "supported size of 0x%zx\n", SanitizerToolName, user_size, max_size);
+  }
+  Die();
+}
+
+void NORETURN ReportOutOfMemory(uptr requested_size, const StackTrace *stack) {
+  {
+    ScopedAllocatorErrorReport report("out-of-memory", stack);
+    Report("ERROR: %s: allocator is out of memory trying to allocate 0x%zx "
+           "bytes\n", SanitizerToolName, requested_size);
+  }
+  Die();
+}
+
+}  // namespace __sanitizer

lib/sanitizer_common/sanitizer_report_decorator.h

 #include "sanitizer_common.h"
 
 namespace __sanitizer {
 class SanitizerCommonDecorator {
   // FIXME: This is not portable. It assumes the special strings are printed to
   // stdout, which is not the case on Windows (see SetConsoleTextAttribute()).
  public:
   SanitizerCommonDecorator() : ansi_(ColorizeReports()) {}
-  const char *Bold()    const { return ansi_ ? "\033[1m" : ""; }
+  const char *Bold() const { return ansi_ ? "\033[1m" : ""; }
   const char *Default() const { return ansi_ ? "\033[1m\033[0m"  : ""; }
   const char *Warning() const { return Red(); }
-  const char *MemoryByte() { return Magenta(); }
+  const char *Error() const { return Red(); }
+  const char *MemoryByte() const { return Magenta(); }
 
  protected:
   const char *Black()   const { return ansi_ ? "\033[1m\033[30m" : ""; }
   const char *Red()     const { return ansi_ ? "\033[1m\033[31m" : ""; }
   const char *Green()   const { return ansi_ ? "\033[1m\033[32m" : ""; }
   const char *Yellow()  const { return ansi_ ? "\033[1m\033[33m" : ""; }
   const char *Blue()    const { return ansi_ ? "\033[1m\033[34m" : ""; }
   const char *Magenta() const { return ansi_ ? "\033[1m\033[35m" : ""; }

test/lsan/TestCases/Linux/aligned_alloc-alignment.cc

+// RUN: %clangxx_lsan -O0 %s -o %t
+// RUN: %env_lsan_opts=allocator_may_return_null=0 not %run %t 2>&1 | FileCheck %s
+// RUN: %env_lsan_opts=allocator_may_return_null=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NULL
+
+// UNSUPPORTED: android
+
+// REQUIRES: stable-runtime
+
+#include <stdio.h>
+#include <stdlib.h>
+
+extern void *aligned_alloc(size_t alignment, size_t size);
+
+int main() {
+  void *p = aligned_alloc(17, 100);
+  // CHECK: {{ERROR: .*Sanitizer: invalid allocation alignment: 17}}
+  // CHECK: {{#0 0x.* in .*}}{{aligned_alloc|memalign}}
+  // CHECK: {{#1 0x.* in main .*aligned_alloc-alignment.cc:}}[[@LINE-3]]
+  // CHECK: {{SUMMARY: .*Sanitizer: invalid-allocation-alignment}}
+
+  printf("pointer after failed aligned_alloc: %zd\n", (size_t)p);
+  // CHECK-NULL: pointer after failed aligned_alloc: 0
+
+  return 0;
+}

test/lsan/TestCases/Posix/lit.local.cfg

+def getRoot(config):
+  if not config.parent:
+    return config
+  return getRoot(config.parent)
+
+root = getRoot(config)
+
+if root.host_os in ['Windows']:
+  config.unsupported = True

test/lsan/TestCases/Posix/posix_memalign-alignment.cc

+// RUN: %clangxx_lsan -O0 %s -o %t
+// RUN: %env_lsan_opts=allocator_may_return_null=0 not %run %t 2>&1 | FileCheck %s
+// RUN: %env_lsan_opts=allocator_may_return_null=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NULL
+
+// REQUIRES: stable-runtime
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+  void *p = reinterpret_cast<void*>(42);
+  int res = posix_memalign(&p, 17, 100);
+  // CHECK: {{ERROR: .*Sanitizer: invalid alignment requested in posix_memalign: 17}}
+  // CHECK: {{#0 0x.* in .*posix_memalign}}
+  // CHECK: {{#1 0x.* in main .*posix_memalign-alignment.cc:}}[[@LINE-3]]
+  // CHECK: {{SUMMARY: .*Sanitizer: invalid-posix-memalign-alignment}}
+
+  printf("pointer after failed posix_memalign: %zd\n", (size_t)p);
+  // CHECK-NULL: pointer after failed posix_memalign: 42
+
+  return 0;
+}

test/lsan/TestCases/allocator_returns_null.cc

 // RUN:   | FileCheck %s --check-prefix=CHECK-nCRASH
 // RUN: %env_lsan_opts=allocator_may_return_null=1 not %run %t new 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-nCRASH-OOM
 // RUN: %env_lsan_opts=allocator_may_return_null=0 not %run %t new-nothrow 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-nnCRASH
 // RUN: %env_lsan_opts=allocator_may_return_null=1     %run %t new-nothrow 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-nnNULL
 
-// TODO(alekseyshl): Enable it back for standalone LSan mode when CHECK(0) in
-// LSan allocator are converted to proper errors (see D44404 for the reference).
-// REQUIRES: asan
-
 #include <assert.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <limits>
 #include <new>
 
#endif
   // is always the same.
   fprintf(stderr, "x: %zu\n", (size_t)x);
   free(x);
 
   return x != 0;
 }
 
 // CHECK-mCRASH: malloc:
-// CHECK-mCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-mCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 // CHECK-cCRASH: calloc:
-// CHECK-cCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-cCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 // CHECK-coCRASH: calloc-overflow:
-// CHECK-coCRASH: SUMMARY: AddressSanitizer: calloc-overflow
+// CHECK-coCRASH: {{SUMMARY: .*Sanitizer: calloc-overflow}}
 // CHECK-rCRASH: realloc:
-// CHECK-rCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-rCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 // CHECK-mrCRASH: realloc-after-malloc:
-// CHECK-mrCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-mrCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 // CHECK-nCRASH: new:
-// CHECK-nCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-nCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 // CHECK-nCRASH-OOM: new:
-// CHECK-nCRASH-OOM: SUMMARY: AddressSanitizer: out-of-memory
+// CHECK-nCRASH-OOM: {{SUMMARY: .*Sanitizer: out-of-memory}}
 // CHECK-nnCRASH: new-nothrow:
-// CHECK-nnCRASH: SUMMARY: AddressSanitizer: allocation-size-too-big
+// CHECK-nnCRASH: {{SUMMARY: .*Sanitizer: allocation-size-too-big}}
 
 // CHECK-mNULL: malloc:
 // CHECK-mNULL: errno: 12
 // CHECK-mNULL: x: 0
 // CHECK-cNULL: calloc:
 // CHECK-cNULL: errno: 12
 // CHECK-cNULL: x: 0
 // CHECK-coNULL: calloc-overflow: