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From: Thorsten Leemhuis <>
To: "Nguyen, Anthony L" <>,
	"" <>,
	"" <>,
	"Brandeburg, Jesse" <>
Cc: "Torvalds, Linus" <>,
	"" <>,
	"" <>,
	"" <>
Subject: Re: [PATCH net] igb: fix deadlock caused by taking RTNL in RPM resume path
Date: Wed, 22 Dec 2021 13:50:07 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Scratch that mail, I was totally wrong, as I accidentally looked at
yesterdays linux-next tree, which due to an error of a local cron job
looked like todays linux-next tree to me.

The real one from today is out now and contains the patch. I apologise
for the noise.

Ciao, Thorsten

On 22.12.21 06:17, Thorsten Leemhuis wrote:
> On 20.12.21 20:56, Nguyen, Anthony L wrote:
>> On Sun, 2021-12-19 at 09:31 +0100, Thorsten Leemhuis wrote:
>>> Hi, this is your Linux kernel regression tracker speaking.
>>> On 29.11.21 22:14, Heiner Kallweit wrote:
>>>> Recent net core changes caused an issue with few Intel drivers
>>>> (reportedly igb), where taking RTNL in RPM resume path results in a
>>>> deadlock. See [0] for a bug report. I don't think the core changes
>>>> are wrong, but taking RTNL in RPM resume path isn't needed.
>>>> The Intel drivers are the only ones doing this. See [1] for a
>>>> discussion on the issue. Following patch changes the RPM resume
>>>> path
>>>> to not take RTNL.
>>>> [0]
>>>> [1]
>>>> Fixes: bd869245a3dc ("net: core: try to runtime-resume detached
>>>> device in __dev_open")
>>>> Fixes: f32a21376573 ("ethtool: runtime-resume netdev parent before
>>>> ethtool ioctl ops")
>>>> Tested-by: Martin Stolpe <>
>>>> Signed-off-by: Heiner Kallweit <>
>>> Long story short: what is taken this fix so long to get mainlined? It
>>> to
>>> me seems progressing unnecessary slow, especially as it's a
>>> regression
>>> that made it into v5.15 and thus for weeks now seems to bug more and
>>> more people.
>>> The long story, starting with the background details:
>>> The quoted patch fixes a regression among others caused by
>>> f32a21376573
>>> ("ethtool: runtime-resume netdev parent before ethtool ioctl ops"),
>>> which got merged for v5.15-rc1.
>>> The regression ("kernel hangs during power down") was afaik first
>>> reported on Wed, 24 Nov (IOW: nearly a month ago) and forwarded to
>>> the
>>> list shortly afterwards:
>>> The quoted patch to fix the regression was posted on Mon, 29 Nov (thx
>>> Heiner for providing it!). Obviously reviewing patches can take a few
>>> days when they are complicated, as the other messages in this thread
>>> show. But according to
>>> the patch was
>>> ACKed by Thu, 7 Dec. To quote: ```The patch is on its way via the
>>> Intel
>>> network driver tree:
>>> And that's where the patch afaics still is. It hasn't even reached
>>> linux-next yet, unless I'm missing something. A merge into mainline
>>> thus
>>> is not even in sight; this seems especially bad with the holiday
>>> season
>>> coming up, as getting the fix mainlined is a prerequisite to get it
>>> backported to 5.15.y, as our latest stable kernel is affected by
>>> this.
>> I've been waiting for our validation team to get to this patch to do
>> some additional testing. However, as you mentioned, with the holidays
>> coming up, it seems the tester is now out. As it looks like some in the
>> community have been able to do some testing on this, I'll go ahead and
>> send this on.
> Thx. I see the patch now in addition to dev-queue is also in master of
> this repo:
> But the fix still didn't make it in todays linux-next. Seems neither
> your master branch nor branches like '1GbE' (which seem to be the ones
> from which such fixes later get send to the net tree) are in linux-next
> afaic.
> Just wondering: Wouldn't it be better if they were? This would allow the
> users of linux-next and CIs checking it to test the fix before it's send
> to the net tree, which last week seems to have happened only a few hours
> (6209dd778f66) before net was merged into mainline (180f3bcfe362).
> Ciao, Thorsten

      reply	other threads:[~2021-12-22 12:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-29 21:14 Heiner Kallweit
2021-11-29 23:09 ` Stephen Hemminger
2021-11-30  6:33   ` Heiner Kallweit
2021-11-30  1:17 ` Jakub Kicinski
2021-11-30  6:46   ` Heiner Kallweit
2021-11-30 17:12     ` Jakub Kicinski
2021-11-30 21:35       ` Heiner Kallweit
2021-12-01  0:51         ` Jakub Kicinski
2021-12-19  8:31 ` Thorsten Leemhuis
2021-12-20 19:56   ` Nguyen, Anthony L
2021-12-22  5:17     ` Thorsten Leemhuis
2021-12-22 12:50       ` Thorsten Leemhuis [this message]

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