Files
poky/bitbake/lib
Richard Purdie 1ba387a12c bitbake: cooker: Avoid parser deadlocks
If you make parsing fail (e.g. add something like:

X := "${@d.getVar('MCMACHINES').split()[1]}"

to meson.bbclass, then run "while true; do bitbake -g bash; done"
it will eventually hang. It appears the cancel_join_thread() call the
parsing failure triggers, breaks the results_queue badly enough that it
sits in read() indefintely (called from self.result_queue.get(timeout=0.25)).
The timeout only applies to lock aquisition, not the read call.

I've tried various other approaches such as using cancel_join_thread()
in other places but the only way things don't lock up is to avoid
cancel_join_thread() entirely for results_queue.

I do have a concern that this may adversely affect Ctrl+C handling
but equally, its broken now already and this appears to improve
things.

[YOCTO #14034]

(Bitbake rev: 9c61a1cc7be46c23da1f4ef3bee070fb83c4be57)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-08 10:18:02 +01:00
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