linux-kernel - Re: proc_flush

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Message-ID: <20171221220044.GA4977@codemonkey.org.uk>
Date:   Thu, 21 Dec 2017 17:00:44 -0500
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com, Gargi Sharma <gs051095@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: proc_flush_task oops

On Thu, Dec 21, 2017 at 12:38:12PM +0200, Alexey Dobriyan wrote:
 
 > > with proc_mnt still set to NULL is a mystery to me.
 > >
 > > Is there any chance the idr code doesn't always return the lowest valid
 > > free number?  So init gets assigned something other than 1?
 > 
 > Well, this theory is easy to test (attached).

I didn't hit this BUG, but I hit the same oops in proc_flush_task.

	Dave