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

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Date:   Mon, 24 Oct 2016 20:59:12 -0600
From:   Jens Axboe <axboe@...com>
To:     "Theodore Ts'o" <tytso@....edu>
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 10/24/2016 08:54 PM, Theodore Ts'o wrote:
> 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.

Yes, it should be, so glad that it is!

> 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.

I made that separate change as well. If the job is stuck in the kernel
for some sync operation, we could feasibly be uninterruptible for
minutes. So 1 minutes is too short in any case, and I'd rather just make
this check than sending kill signals since it won't fix the
uninterruptible problem.

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

It was easy based on all your info, since I could not reproduce. So
thanks for your help! Everything should be committed now, and I'll cut a
new release tomorrow so we can hopefully put this behind us.

-- 
Jens Axboe

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