linux-kernel - Re: 4.3-rc3 Regression: NFS access stall by commit 6ae459bdaaee

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Message-ID: <CALnjE+poe5Vfe42fA2Uh+9shhgt2Lpq86b5vxUo5Ecyf8faiPQ@mail.gmail.com>
Date:	Tue, 29 Sep 2015 10:32:14 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anupam Chanda <achanda@...are.com>,
	Tom Herbert <tom@...bertland.com>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 4.3-rc3 Regression: NFS access stall by commit 6ae459bdaaee

On Tue, Sep 29, 2015 at 3:33 AM, Takashi Iwai <tiwai@...e.de> wrote:
> On Tue, 29 Sep 2015 02:35:04 +0200,
> Pravin Shelar wrote:
>>
>> On Mon, Sep 28, 2015 at 6:12 AM, Takashi Iwai <tiwai@...e.de> wrote:
>> > [I resent this since the previous mail didn't go out properly, as it
>> >  seems; apologies if you already read it, please disregard]
>> >
>> > Hi,
>> >
>> > I noticed that NFS access from my workstation slowed down drastically,
>> > almost stalls, with the fresh 4.3-rc3.  There are no particular kernel
>> > errors / warnings.
>> >
>> > Then I performed git section, and it leaded to the commit:
>> > 6ae459bdaaeebc632b16e54dcbabb490c6931d61
>> >     skbuff: Fix skb checksum flag on skb pull
>> >
>> > Reverting this commit from 4.3-rc3 fixed the issue indeed.
>> >
>> > Could you take a look at this?  I added Trond to Cc in case he might
>> > already know of it.
>> >
>> I send out fix for similar issue. Can you try the posted patch.
>> https://patchwork.ozlabs.org/patch/523632/
>
> Yes, the patch fixes the problem, thanks.  Feel free to take my
> tested-by tag:
>   Tested-by: Takashi Iwai <tiwai@...e.de>
>
Thanks for testing the patch.

> But I guess the real fix is only the first chunk and the latter is
> nothing but a cleanup?  If so, it'd be better to split it.
>

Both chunks are required for the fix.
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