On 12.08.2020 05:09, Dmitry Markov wrote:
TranslateMessage() does not invoke PeekMessage(). In our case
TranslateMessage() is called by AWT. IME functionality may call PeekMessage()
during TranslateMessage() execution. However that PeekMessage() call is
intended for processing non-queued messages, (i.e. the messages send via
SendMessage() call).
I contacted Microsoft regarding this problem and one of their suggestions was
to use PostMessage() instead of SendMessage() for IME messages to avoid IME
internal data corruption and the crash.
The proposed fix was tested by the stress test for several weeks and no issues
were observed. So I feel quite confident that it eliminates the issue.
There is no exact message which triggers the crash. Usually the crash is caused
by one of the following messages: WM_AWT_ASSOCIATECONTEXT or
WM_AWT_SETOPENSTATUS but several times I observed that it was triggered by
WM_AWT_DESTROYCONTEXT or WM_AWT_CREATECONTEXT. It looks like almost every
IME-related message may cause the crash. I think SendMessage() call should be
substituted by PostMessage() for all IME messages.
Ok, then please add this(or similar) information to the new method
"InvokeInputMethodFunction",
otherwise it could be removed in the future/replaced back to the sendMessage.
Regards,
Dmitry
On 12 Aug 2020, at 06:16, Sergey Bylokhov <sergey.bylok...@oracle.com> wrote:
Hi, Dmitry.
On 11.08.2020 01:07, Dmitry Markov wrote:
Problem description:
The root cause of the crash is the lack of synchronisation in imjpapi.dll. In
particular when IME messages are processed in the message loop and another
message triggered through a SendMessage() call, this clears the buffer context
so on further processing the message loop in IME context will point to invalid
memory buffer. Microsoft article devoted to this issue:
https://docs.microsoft.com/en-us/troubleshoot/windows/win32/ime-crash-processing-cross-thread-sent-message
The documentation above also states that PeekMessage, called by the
TranslateMessage when the IME is ON, can proceed the posted messages as well if
that true then the current fix does not help.
Fix:
Replace SendMessage() with PostMessage() for IME messages and implement event
based mechanism to notify the sender that the message processing is completed.
What exact message broke the IME, the "WM_AWT_DESTROYCONTEXT"?
Testing:
mach5 client tests (jtreg headful, jck, etc.) are green.
Regards,
Dmitry
--
Best regards, Sergey.
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Best regards, Sergey.
