Index: llvm/lib/Support/Unix/Path.inc
===================================================================
--- llvm/lib/Support/Unix/Path.inc
+++ llvm/lib/Support/Unix/Path.inc
@@ -1075,15 +1075,18 @@
 
 Expected<size_t> readNativeFileSlice(file_t FD, MutableArrayRef<char> Buf,
                                      uint64_t Offset) {
+  auto Read = [&](size_t Size) {
 #ifdef HAVE_PREAD
-  ssize_t NumRead =
-      sys::RetryAfterSignal(-1, ::pread, FD, Buf.data(), Buf.size(), Offset);
+    return sys::RetryAfterSignal(-1, ::pread, FD, Buf.data(), Size, Offset);
 #else
-  if (lseek(FD, Offset, SEEK_SET) == -1)
-    return errorCodeToError(std::error_code(errno, std::generic_category()));
-  ssize_t NumRead =
-      sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Buf.size());
+    if (lseek(FD, Offset, SEEK_SET) == -1)
+      return -1;
+    return sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Size);
 #endif
+  };
+  ssize_t NumRead = Read(Buf.size());
+  if (NumRead == -1 && errno == EINVAL)
+    NumRead = Read(Buf.size() / 2); // Try reading a smaller chunk.
   if (NumRead == -1)
     return errorCodeToError(std::error_code(errno, std::generic_category()));
   return NumRead;