On Thu, 15 Jul 2021 11:02:21 GMT, Jorn Vernee <jver...@openjdk.org> wrote:
>> How does native code reach a safepoint polling point? > > The stack trace looks like this: > > > Current thread (0x000002a2489f0b50): JavaThread "Thread-4551" > [_thread_in_Java, id=24920, stack(0x000000d9e0500000,0x000000d9e0600000)] > > Stack: [0x000000d9e0500000,0x000000d9e0600000] > Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native > code) > V [jvm.dll+0xae6651] os::platform_print_native_stack+0xf1 > (os_windows_x86.cpp:235) > V [jvm.dll+0xda3f25] VMError::report+0x1005 (vmError.cpp:739) > V [jvm.dll+0xda58ae] VMError::report_and_die+0x7fe (vmError.cpp:1549) > V [jvm.dll+0xda5fe4] VMError::report_and_die+0x64 (vmError.cpp:1330) > V [jvm.dll+0x4ceca7] report_vm_error+0xb7 (debug.cpp:282) > V [jvm.dll+0x6511be] HandleArea::allocate_handle+0x3e (handles.cpp:35) > V [jvm.dll+0xb8e334] > ThreadSafepointState::handle_polling_page_exception+0x314 (safepoint.cpp:939) > C 0x000002a035d8caa7 > > Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) > v ~SafepointBlob > J 639 c1 > java.lang.invoke.LambdaForm$MH+0x000000080101b800.invoke(Ljava/lang/Object;)V > java.base@18-internal (87 bytes) @ 0x000002a03635f7b4 > [0x000002a03635f4a0+0x0000000000000314] > J 620 c1 > java.lang.invoke.LambdaForm$MH+0x0000000801018c00.invoke(Ljava/lang/Object;)V > java.base@18-internal (37 bytes) @ 0x000002a036353e0c > [0x000002a036353720+0x00000000000006ec] > v ~BufferBlob::mэYссссЫGў > > > So I think the 'native code' is something being called by the safepoint blob, > but I'm not sure why it's marked with a `C` instead of `V` in the stack trace > (maybe just a stack unwind failure?). > > FWIW, this part has already been fixed as part of: > https://github.com/openjdk/jdk17/pull/173 (not sure why it still shows up in > the diff) Okay so we're not actually _thread_in_native it is just a chunk of VM generated code. Something still seems off to me about the need for the HandleMark but that isn't your problem. ------------- PR: https://git.openjdk.java.net/jdk17/pull/149
