On Thu, 11 Aug 2016, Thomas Garnier wrote:
> Restore the processor state before calling any other function to ensure
> per-cpu variables can be used with KASLR memory randomization.
>
> Tracing functions use per-cpu variables (gs based) and one was called
> just before restoring the processor state fully. It resulted in a double
> fault when both the tracing & the exception handler functions tried to
> use a per-cpu variable.
>
> Signed-off-by: Thomas Garnier <thgar...@google.com>
Alright, this did the trick, thanks :) Feel free to add
Reported-by: Jiri Kosina <jkos...@suse.cz>
Tested-by: Jiri Kosina <jkos...@suse.cz>
One thing is still beyond me though ... how the heck this doesn't happen
without DEBUG_LOCK_ALLOC? The percpu area pointer should be corrupted
nevertheless, shouldn't it?
Thanks,
--
Jiri Kosina
SUSE Labs
