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Steps to Reproduce:

$ sudo cat /proc/kallsyms  | grep pid_max
  c000000001308794 D pid_max

$ echo x > /proc/sysrq-trigger

xmon> bd c000000001308794

xmon> x

As soon as pid_max got accessed, machine should automatically enter into
xmon. But that is not happening.


Machine detail:

$ uname -a
  Linux tul163-u1704-qemu 4.10.0-13-generic #15 SMP Wed Mar 22 06:35:20 EDT 
2017 ppc64le ppc64le ppc64le GNU/Linux

$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=17.04
DISTRIB_CODENAME=zesty
DISTRIB_DESCRIPTION="Ubuntu Zesty Zapus (development branch)"

This patch solves the issue:
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=c21a493a2b44650707d06741601894

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-152886 severity-high 
targetmilestone-inin1704
-- 
Ubuntu 17.04: xmon: data-breakpoint not working
https://bugs.launchpad.net/bugs/1675772
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