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

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Date:   Thu, 12 Dec 2019 09:25:32 -0300
From:   Rafael David Tinoco <rafaeldtinoco@...ntu.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
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)



>> 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.)?

Yep, its the autopkgtests (debian/tests/*) from ocfs2-tools in bare
metal ppc64el. A bunch of "mkfs.ocfs2, fsck.ocfs2, debugfs.ocfs2,
mount.ocfs2" commands testing package. I got access to same HW that
generated the trace, I'll generate a kdump and share more data soon.