[TSan] More detailed error message on failed sahdow memory madvise
Summary:
Report errno value on failed shadow memory madvise attempt and add a
hint message with the possible workaround.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
#if SANITIZER_POSIX
#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_errno.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include "tsan_platform.h"
namespace __tsan {
static const char kShadowMemoryMappingWarning[] =
- "FATAL: %s can not madvise shadow region [%zx, %zx] with %s\n";
+ "FATAL: %s can not madvise shadow region [%zx, %zx] with %s (errno: %d)\n";
+static const char kShadowMemoryMappingHint[] =
+ "HINT: if %s is not supported in your environment, you may set "
+ "TSAN_OPTIONS=%s=0\n";
static void NoHugePagesInShadow(uptr addr, uptr size) {
if (common_flags()->no_huge_pages_for_shadow)
if (!NoHugePagesInRegion(addr, size)) {
Printf(kShadowMemoryMappingWarning, SanitizerToolName, addr, addr + size,
- "MADV_NOHUGEPAGE");
+ "MADV_NOHUGEPAGE", errno);
+ Printf(kShadowMemoryMappingHint, "MADV_NOHUGEPAGE",
+ "no_huge_pages_for_shadow");
Die();
}
}
@@ -39,7 +45,8 @@ static void DontDumpShadow(uptr addr, uptr size) {
if (common_flags()->use_madv_dontdump)
if (!DontDumpShadowMemory(addr, size)) {
Printf(kShadowMemoryMappingWarning, SanitizerToolName, addr, addr + size,
- "MADV_DONTDUMP");
+ "MADV_DONTDUMP", errno);
+ Printf(kShadowMemoryMappingHint, "MADV_DONTDUMP", "use_madv_dontdump");
Die();
}
}
