gkr-operation assertion failures from dbus-using, multithreaded Python apps

For libgnome-keyring0 2.30.0-0ubuntu3, desktopcouch-service can cause assertion failures in libgnome-keyring0 gkr-operation.c in at least three locations.
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cmiller@zippy:~$ /usr/lib/desktopcouch/desktopcouch-service
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ERROR:gkr-operation.c:313:callback_with_message: assertion failed: (cb)
Aborted (core dumped)

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cmiller@zippy:~$ /usr/lib/desktopcouch/desktopcouch-service
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ERROR:gkr-operation.c:169:gkr_operation_set_result: assertion failed: ((int) res != INCOMPLETE)
Aborted (core dumped)

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cmiller@zippy:~$ /usr/lib/desktopcouch/desktopcouch-service
**
ERROR:gkr-operation.c:392:gkr_operation_block: code should not be reached
Aborted (core dumped)

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It *may* be related to these bug reports:

https://bugzilla.gnome.org/show_bug.cgi?id=606902

https://bugs.freedesktop.org/show_bug.cgi?id=857

https://bugs.freedesktop.org/show_bug.cgi?id=19796