linux-ext4 - Re: general protection fault in ext4

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Date:   Mon, 11 Nov 2019 13:24:17 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     syzbot <syzbot+9567fda428fba259deba@...kaller.appspotmail.com>,
        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Jan Kara <jack@...e.cz>
Subject: Re: general protection fault in ext4_writepages

On Mon, Nov 11, 2019 at 11:02:31AM +0530, Ritesh Harjani wrote:
> 
> Updating the link.
> 
> On 11/11/19 10:42 AM, Ritesh Harjani wrote:
> > Hello Ted,
> > 
> > This issue seems to be coming via fault injection failure in slab
> > allocation. This should be fixed via below patch on your latest ext4
> > branch.
> > 
> > https://marc.info/?l=linux-ext4&m=804&w=2
> https://marc.info/?l=linux-ext4&m=157303310723804&w=2

Agreed, although unfortunately I wasn't able to make the reproducer
cause a failure _without_ the patch.  Perhaps something other than
enabling FAILSLAB and KASAN was needed?

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git test

Let's see if the Syzbot can confirm that the patch addresses the problem.

      	     	 	    	    	 - Ted