Re: Repeatable hard lockup running strace testsuite on 4.19.98+ onwards

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On Fri, Jun 26, 2020 at 08:01:18PM +0100, Steve McIntyre wrote:
On Fri, Jun 26, 2020 at 10:29:28AM -0700, John Johansen wrote:
On 6/26/20 9:50 AM, Steve McIntyre wrote:

OK, will try that second...


I have not been able to reproduce but

So looking at linux-4.19.y it looks like
1f8266ff5884 apparmor: don't try to replace stale label in ptrace access check

was picked without
ca3fde5214e1 apparmor: don't try to replace stale label in ptraceme check

Both of them are marked as
Fixes: b2d09ae449ced ("apparmor: move ptrace checks to using labels")

so I would expect them to be picked together.

ptraceme is potentially updating the task's cred while the access check is
running.

Try building after picking
ca3fde5214e1 apparmor: don't try to replace stale label in ptraceme check

Bingo! With that one change the test suite runs to completion, no lockup.

I've queued ca3fde5214e1 for 4.19 and 4.14, thank you for your work!

--
Thanks,
Sasha



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