[Bug 1558764] [NEW] Sysrq trigger g cause system hang on Ubuntu 15.10

[Eric Huang]

Public bug reported:

I are using kgdb to debug kernel driver. The break point and sysrq work
fine on Ubuntu 14.04. But when I upgrade Ubuntu from 14.04 to 15.10, the
sysrq trigger g (alt+sysrq+g) doesn't make gdb break and system hangs.
It is a regression. The issue only happens after kernel booting up. It
is OK during kernel booting.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1558764

Title:
  Sysrq trigger g cause system hang on Ubuntu 15.10

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I are using kgdb to debug kernel driver. The break point and sysrq
  work fine on Ubuntu 14.04. But when I upgrade Ubuntu from 14.04 to
  15.10, the sysrq trigger g (alt+sysrq+g) doesn't make gdb break and
  system hangs. It is a regression. The issue only happens after kernel
  booting up. It is OK during kernel booting.

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