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From: Dexuan Cui <decui@microsoft.com>
To: Greg KH <greg@kroah.com>
Cc: Jan Kara <jack@suse.cz>, Guillaume Morin <guillaume@morinfr.org>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Pavlos Parissis <pavlos.parissis@gmail.com>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>,
	"jack@suse.com" <jack@suse.com>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"mszeredi@redhat.com" <mszeredi@redhat.com>
Subject: RE: kernel panics with 4.14.X versions
Date: Tue, 17 Apr 2018 17:42:38 +0000	[thread overview]
Message-ID: <KL1P15301MB0006AE4B63A9C92C43348DBCBFB70@KL1P15301MB0006.APCP153.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20180417103344.GB8445@kroah.com>

> From: Greg KH <greg@kroah.com>
> Sent: Tuesday, April 17, 2018 03:34
> On Mon, Apr 16, 2018 at 09:10:35PM +0000, Dexuan Cui wrote:
> > > From: Jan Kara <jack@suse.cz>
> > > Sent: Monday, April 16, 2018 07:41
> > > ...
> > > How easily can you hit this? Are you able to run debug kernels / inspect
> > > crash dumps when the issue occurs? Also testing with the latest mainline
> > > kernel (4.16) would be welcome whether this isn't just an issue with the
> > > backport of fsnotify fixes from Miklos.
> >
> > It's not easy for us to reproduce the fsnotify() lockup issue, and actually
> > we still don't have an easy & reliable way to reproduce it.
> >
> > According to our tests, v4.16 doesn't have the issue.
> > And v4.15 doesn't have the issue either, if I recall correctly.
> > I only know the issue happens to v4.14.x and 4.13.x kernels
> 
> Any chance to run 'git bisect' between 4.14 and 4.15 to find the fix?
> greg k-h

Sorry, I'm afraid not. 
It was only reproducible in a customer VM with a specific workload and it took
days to hit the issue. The customer VM doesn't exist any more. And we even
can't find a way to reproduce the issue with fio tests + programs that test fsnotify().

-- Dexuan

  parent reply	other threads:[~2018-04-17 17:42 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20180416132550.d25jtdntdvpy55l3@bender.morinfr.org>
2018-04-16 14:40 ` Jan Kara
2018-04-16 16:06   ` Guillaume Morin
2018-04-16 21:10   ` Dexuan Cui
2018-04-17 10:33     ` Greg KH
2018-04-17 11:48       ` Amir Goldstein
2018-04-17 12:03         ` Jan Kara
2018-04-17 17:42       ` Dexuan Cui [this message]
2018-04-16 23:31   ` Pavlos Parissis
2018-04-17 11:18     ` Pavlos Parissis
2018-04-17 12:04       ` Jan Kara
2018-04-17 12:12     ` Jan Kara
2018-04-18  8:32       ` Pavlos Parissis
2018-04-19 20:23         ` Jan Kara
2018-04-19 21:16           ` Pavlos Parissis
2018-04-19 21:24             ` Robert Kolchmeyer
2018-04-19 21:37           ` Dexuan Cui
2018-04-20 10:21             ` Jan Kara
2018-04-20 17:43               ` Dexuan Cui
2018-04-16 11:54 Pavlos Parissis

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