Haren Myneni [off-list ref] writes:

Eric W. Biederman wrote:

quoted

A couple stray bits of feedback.  Downing the interface is generally
a user space requirement like unmounting filesystems.
/sbin/kexec and /sbin/reboot both perform this operation so I don't
see how this bug was hit.

Thanks for your feedback. We are still working on kexec tools for PPC64. In the
mean time, I was using a temporary tool which does not do ifdown. I was in the
impression that the kexec boot will be successful since the normal kexec code
path (kernel/sys.c) contains device_shutdown/reboot notifier. It turns out I am
wrong.

Buggy drivers will do that to you as well.  But not doing a clean shutdown
(downing interfaces, and unmounting the filesystems) doesn't help things  :)

Eric