linux-ext4 - Re: ppc64el kernel access of bad area (ext4_htree_store_dirent->rb_insert

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Message-ID: <20191210020130.GA61323@mit.edu>
Date:   Mon, 9 Dec 2019 21:01:30 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Rafael David Tinoco <rafaeldtinoco@...ntu.com>
Cc:     ebiggers3@...il.com, adilger.kernel@...ger.ca,
        bot+eb13811afcefe99cfe45081054e7883f569f949d@...kaller.appspotmail.com,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: ppc64el kernel access of bad area
 (ext4_htree_store_dirent->rb_insert_color)

On Mon, Dec 09, 2019 at 10:29:14AM -0300, Rafael David Tinoco wrote:
> It looks like the same stacktrace that was reported in this thread. This has
> been reported to ppc64el AND we got a reproducer (ocfs2-tools autopkgtests).

Can you share your reproducer?  Is it a super-simple reproducer that
doesn't require a complex setup and which can be triggered in some
kind of virtual machine (under KVM, etc.)?

> Thread from beginning 2018, so I guess this issue is pretty intermittent but
> might exist, and, perhaps, its related to specific arches/machines ?

What syzbot reported (a) had no reproducer, (b) only reproduced twice
on linux-next in 2017, and never since.  So if you're seeing something
in 2019 in ppc64el, it may not be the same issue.

   	   	       	       	      - Ted