diff --git a/thirdparty/libbacktrace/read.c b/thirdparty/libbacktrace/read.c
index 7af66602fd..a7e937667c 100644
--- a/thirdparty/libbacktrace/read.c
+++ b/thirdparty/libbacktrace/read.c
@@ -52,14 +52,7 @@ backtrace_get_view (struct backtrace_state *state, int descriptor,
 {
   uint64_t got;
   ssize_t r;
-
-  if ((uint64_t) (size_t) size != size)
-    {
-      error_callback (data, "file size too large", 0);
-      return 0;
-    }
-
-  if (lseek (descriptor, offset, SEEK_SET) < 0)
+  if (_lseeki64 (descriptor, offset, SEEK_SET) < 0)
     {
       error_callback (data, "lseek", errno);
       return 0;
@@ -72,9 +65,13 @@ backtrace_get_view (struct backtrace_state *state, int descriptor,
   view->len = size;
 
   got = 0;
+  void *ptr = view->base;
   while (got < size)
     {
-      r = read (descriptor, view->base, size - got);
+      uint64_t sz = size - got;
+      if (sz > INT_MAX)
+        sz = INT_MAX;
+      r = _read (descriptor, ptr, sz);
       if (r < 0)
 	{
 	  error_callback (data, "read", errno);
@@ -84,6 +81,7 @@ backtrace_get_view (struct backtrace_state *state, int descriptor,
       if (r == 0)
 	break;
       got += (uint64_t) r;
+      ptr += r;
     }
 
   if (got < size)