Re: [PATCH 0/9] [v3] x86, pkeys: two protection keys bug fixes

From: Dave Hansen
Date: Mon Apr 30 2018 - 11:30:49 EST

On 04/28/2018 12:05 AM, Ingo Molnar wrote:
> In the above kernel that was missing the PROT_EXEC fix I was repeatedly running
> the 64-bit and 32-bit testcases as non-root and as root as well, until I got a
> hang in the middle of a 32-bit test running as root:
> test 7 PASSED (iteration 19)
> test 8 PASSED (iteration 19)
> test 9 PASSED (iteration 19)
> < test just hangs here >

For the hang, there is a known issue with the use of printf() in the
signal handler and a resulting deadlock. I *thought* there was a patch
merged to fix this from Ram Pai or one of the other IBM folks.