[Libreoffice-bugs] [Bug 129838] deadlock with async vs sync cppu_threadpool::JobQueue in UITest_writer_dialogs

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129838

--- Comment #2 from Stephan Bergmann <sbergman at redhat.com> ---
The problem is that thread 1 frame 13 makes a call on a UNO object while it
allegedly holds the SolarMutex.

The remote side servicing that call apparently sends back an async release
call.  However, async calls are executed on fresh threads (thread 6 here), see
<https://wiki.openoffice.org/wiki/Uno/Remote/Specifications/Uno_Remote_Protocol#Threads>:
 "Whenever an asynchronous request message becomes the first entry in a queue
for a given TID (of some UNO thread h), the receiving side starts to
sequentially execute the computation steps corresponding to the requested UNO
interface method, in a new (previously immaterial) thread h′. It uses the TID
of thread h′ for all request messages sent while executing these computation
steps. When it is finished with the computation steps, thread h′ transitions
from active to done, and the asynchronous request message is removed from the
head of the queue."

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