Re: ppc64el kernel access of bad area (ext4_htree_store_dirent->rb_insert_color)

[Theodore Y. Ts'o]

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