Ramon, I'm not certain yet if LP #1516451 and LP #1516451 are precisely the same issue, although it's likely they can be solved in similar fashion. Your customer issue looks like a better match to 1516451 since it involves the /sys/kernel/debug/tracing file which I see you've already commented on with a better test case than I had found, so I'll follow up with you there.
Ramon, I'm not certain yet if LP #1516451 and LP #1516451 are precisely the same issue, although it's likely they can be solved in similar fashion. Your customer issue looks like a better match to 1516451 since it involves the /sys/kernel/ debug/tracing file which I see you've already commented on with a better test case than I had found, so I'll follow up with you there.