Hello,

LGTM with a comment below.

Sergey

<snipped>

diff --git a/test/LuaJIT-tests/lang/stackov.lua b/test/LuaJIT-tests/lang/stackov.lua
index 8afa86b4..b052ad80 100644
--- a/test/LuaJIT-tests/lang/stackov.lua
+++ b/test/LuaJIT-tests/lang/stackov.lua

I don't get why we need this change. With reverted patch this test is 
passed.

With reverted -- yes. But after reworking the stack overflow handling,
it is possible that there is no place on the stack to call the error
handler (in that case, `debug.traceback`). Since this thing looks like
implementation-defined behaviour, I prefer to make the test less strict.

@@ -31,13 +31,17 @@ end
  do --- Base test.
    local err, s = xpcall(f, debug.traceback)
    assert(err == false)
-  test_error_msg(f, s)
+  -- There is no place on the stack to invoke the handler.
+  -- Just test the error reason.
+  assert(string.match(s, "stack overflow"))
  end
  
  do --- Stack overflow with non-empty arg list.
    local err, s = xpcall(g, debug.traceback, 1)
    assert(err == false)
-  test_error_msg(g, s)
+  -- There is no place on the stack to invoke the handler.
+  -- Just test the error reason.
+  assert(string.match(s, "stack overflow"))
  end
  
  do --- Vararg tail call with non-empty arg list. +slow

<snipped>