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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: linux (Ubuntu)
Importance: Undecided
Status: New
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Sysrq trigger g cause system hang on Ubuntu 15.10
https://bugs.launchpad.net/bugs/1558764
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