[yocto] Annoying "rerun to fix" bug for bitbake: task failed, but rerun can fix it.

[Nicolas Dechesne]

On Wed, Nov 8, 2017 at 5:13 PM, Jerry Lian <jerry.lian at gmail.com> wrote:
> So according to what you said: the build will fail no matter what.
> But that is not my observation: my build succeed eventually (but you just
> need to rerun many times)!!!

ah. sorry, i missed that part. So then it's probably a bug in the
recipe, missing dependency or something along these lines. It would be
legit to report this bug then.


>
> On Wed, Nov 8, 2017 at 10:53 AM, Nicolas Dechesne
> <nicolas.dechesne at linaro.org> wrote:
>>
>> On Wed, Nov 8, 2017 at 4:49 PM, Jerry Lian <jerry.lian at gmail.com> wrote:
>> > I am not sure whether it is a bug or an error:
>> > * Quite often, bitbake will fail before finishing, with message like:
>> > ...
>> > task failed with exit code 1...
>> > * But if you rerun bitbake, it will continue to build.
>> > * So sometimes I have to rerun many times for finish one build ----
>> > annoying!
>> > (by the way, my CPU can run 16 threads)
>> >
>> > Any idea to clear this annoying bug?
>>
>> it's not a bug. bitbake is using parallel tasks a lot. At any time it
>> is running N tasks. When one task fails, it will wait for N-1 ongoing
>> tasks to finish, and then stops.
>>
>> If you restart again, it will likely try N new tasks again, and the
>> same task that failed,  will fail again, it will wait for N-1 tasks to
>> complete.
>>
>> if you do that several times, you will  end up in a situation where
>> the only task that can run is the 'failing' one, so it will try 1 task
>> and fail immediately.
>>
>> > thanks.
>> >
>> > --
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>> >
>
>