Eric W. Biederman wrote:

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.

Thanks
Haren