linux-kernel - Re: [PATCH v2 00/12] btrfs: add zstd compression level support

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Date:   Tue, 5 Feb 2019 13:30:27 -0500
From:   Dennis Zhou <dennis@...nel.org>
To:     David Sterba <dsterba@...e.cz>
Cc:     Dennis Zhou <dennis@...nel.org>, David Sterba <dsterba@...e.com>,
        Josef Bacik <josef@...icpanda.com>, Chris Mason <clm@...com>,
        Omar Sandoval <osandov@...ndov.com>,
        Nick Terrell <terrelln@...com>,
        Nikolay Borisov <nborisov@...e.com>, kernel-team@...com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/12] btrfs: add zstd compression level support

On Tue, Feb 05, 2019 at 07:27:49PM +0100, David Sterba wrote:
> On Tue, Feb 05, 2019 at 06:07:49PM +0100, David Sterba wrote:
> > On Tue, Feb 05, 2019 at 05:51:13PM +0100, David Sterba wrote:
> > > On Tue, Feb 05, 2019 at 11:30:12AM -0500, Dennis Zhou wrote:
> > > > > > > Something is wrong, the patchset on top of 5.0-rc5 hangs in test
> > > > > > > btrfs/007, without a stacktrace. V1 was fine and I double checked that
> > > > > > > rc5 itself is fine.
> > > > > > 
> > > > > > Hmmm, well that's awkward. I ran xfstests and that test passed on my
> > > > > > machine. I'll figure out the delta and submit a v3. Thanks David!
> > > > > 
> > > > > It failed on a VM and 2 other physical machines, so it's not somethig
> > > > > related to the testing setup.
> > > > 
> > > > Oh, I wasn't alluding to that. I'm more that sure it's my fault
> > > > somewhere along the line.
> > > 
> > > Hang on, it's probably caused by fstests, as fssum is busy waiting
> > > somewhere, so it's not even kernel code.
> > > 
> > > fstests a4235f29f780b15d9e87c0f2446a53b9e69c5e2d -- ok
> > > fstests 6d17c9076fe9d97d2411e5909e6b255e5e721fc3 (master) -- hangs
> > 
> > Git bisect points to
> > 
> > commit 04b405fa1f8d0cacde489f3d1c8771dfe7a34dc0
> > Author: Zorro Lang <zlang@...hat.com>
> > Date:   Wed Jan 23 15:34:55 2019 +0800
> > 
> >     common/dump: disable splice from FSSTRESS_AVOID
> 
> So with this commit reverted, test btrfs/007 does not hang anymore.

Ok great! I'm going to add a v2 for 0012 to add taking the spin_lock
just to be safe in cleanup. I should have that ready in a few minutes.

Thanks,
Dennis