diff -rNU3 gcc-9.2.0.old/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc gcc-9.2.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
--- gcc-9.2.0.old/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc	2018-10-31 12:14:23.000000000 +0100
+++ gcc-9.2.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc	2020-02-03 15:14:36.095084796 +0100
@@ -1156,8 +1156,7 @@
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
-#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
-/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
+#if !SANITIZER_LINUX || __GLIBC_PREREQ (2, 31)
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
 #endif
 
diff -rNU3 gcc-9.2.0.old/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h gcc-9.2.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
--- gcc-9.2.0.old/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h	2019-04-08 15:08:30.000000000 +0200
+++ gcc-9.2.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h	2020-02-03 15:12:44.373316536 +0100
@@ -211,26 +211,13 @@
     u64 __unused1;
     u64 __unused2;
 #elif defined(__sparc__)
-#if defined(__arch64__)
     unsigned mode;
-    unsigned short __pad1;
-#else
-    unsigned short __pad1;
-    unsigned short mode;
     unsigned short __pad2;
-#endif
     unsigned short __seq;
     unsigned long long __unused1;
     unsigned long long __unused2;
-#elif defined(__mips__) || defined(__aarch64__) || defined(__s390x__)
-    unsigned int mode;
-    unsigned short __seq;
-    unsigned short __pad1;
-    unsigned long __unused1;
-    unsigned long __unused2;
 #else
-    unsigned short mode;
-    unsigned short __pad1;
+    unsigned int mode;
     unsigned short __seq;
     unsigned short __pad2;
 #if defined(__x86_64__) && !defined(_LP64)