linux-ext4 - Re: Test generic/299 stalling forever

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Date:   Mon, 24 Oct 2016 22:54:56 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Jens Axboe <axboe@...com>
Cc:     Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
        fstests@...r.kernel.org, tarasov@...ily.name
Subject: Re: Test generic/299 stalling forever

On Mon, Oct 24, 2016 at 10:28:14AM -0600, Jens Axboe wrote:

> How about the below? Bump the timeout to 5 min, 1 min is a little on the
> short side, we want normal error handling to be out of the way before
> that happens. And additionally, break out if we have been marked as
> reaped/exited, so we avoid grabbing the stat mutex again.

Yep, that works.  I tried a test with just the second change:

> +		/*
> +		 * If we took too long to shut down, the main thread could
> +		 * already consider us reaped/exited. If that happens, break
> +		 * out and clean up.
> +		 */
> +		if (td->runstate >= TD_EXITED)
> +			break;
> +

And that's sufficient to solve the problem.

Increasing the timeout to 5 minute also would be a good idea, so we
can let the worker threads exit cleanly so the reported stats will be
completely accurate.

Thanks for your help in figuring out this long-standing problem!

       	   	     		     	  		- Ted
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