Crash on macosx-aarch64 when merging Leyden premain with mainline

[Vladimir Kozlov]

JDK-8361376 removed WXWrite from 
BarrierSetNMethod::nmethod_stub_entry_barrier() because it does not 
modify nmethod directly in mainline. In leyden repo we do modify it.

Putting it back to leyden code solved the issue:

src/hotspot/share/gc/shared/barrierSetNMethod.cpp
@@ -205,6 +205,7 @@ int 
BarrierSetNMethod::nmethod_stub_entry_barrier(address* return_address_ptr) {
    }

    if (may_enter) {
+    MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current()));
      nm->set_used();
    } else {
      log_trace(nmethod, barrier)("Deoptimizing nmethod: " PTR_FORMAT, 
p2i(nm));

Vladimir K

On 9/22/25 10:35 AM, Vladimir Kozlov wrote:
> Before you jump on it. Let me investigate this first to get more details.
> 
> I am working on merge of latest mainline into leyden repo.
> 
> Vladimir K
> 
> On 9/22/25 12:37 AM, Andrew Haley wrote:
>> On 22/09/2025 01:04, ioi.lam at oracle.com wrote:
>>> Hi Andrew, do you know why we are seeing the crash in leyden but not in
>>> mainline?
>>
>> No. If you let me have your merged tree I'll have a look.
>>
>