Reading subprocess stdout susceptible to deadlock

[Roger Riggs]

Hi Vitaly,

I haven't seen that before, please create a bug and include the stack 
traces.

Thanks, Roger


On 3/30/2016 9:56 AM, Vitaly Davidovich wrote:
> Hi,
>
> It seems that doing a blocking read on a subprocess's stdout can lead to
> deadlock between the thread doing the read and the process reaper thread.
> The deadlock occurs because the reader is synchronized on the
> ProcessPipeInputStream, blocks for more data to consume, and process reaper
> comes along trying to call processExited, which also synchronizes on the
> same PPIS.  The reader appears stuck because it's not seeing the EOF due to
> process reaper not being able to close the stream.
>
> I couldn't find any existing reports of this via quick search, which makes
> me wonder if I'm missing something.  Is this a known issue?
>
> Thanks
>
>