linux-kernel - RE: kernel panics with 4.14.X versions

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Message-ID: <KL1P15301MB0006B378757EC8F6B4D87BBBBFB00@KL1P15301MB0006.APCP153.PROD.OUTLOOK.COM>
Date:   Mon, 16 Apr 2018 21:10:35 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Jan Kara <jack@...e.cz>, Guillaume Morin <guillaume@...infr.org>
CC:     Haiyang Zhang <haiyangz@...rosoft.com>,
        Pavlos Parissis <pavlos.parissis@...il.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "jack@...e.com" <jack@...e.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mszeredi@...hat.com" <mszeredi@...hat.com>
Subject: RE: kernel panics with 4.14.X versions

> From: Jan Kara <jack@...e.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

Thanks,
-- Dexuan