FYI, we noticed the following commit (built with gcc-7):

commit: 7da66670775d201f633577f5b15a4bbeebaaa2b0 ("crypto: testmgr - add AES-CFB tests")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: tcrypt
with following parameters:

	period: 2s
	modes: 200-204
	ucode: 0xb00002e
	cpufreq_governor: performance



on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):




2018-11-20 17:49:13 /sbin/modprobe tcrypt sec=2 mode=200
2018-11-20 17:54:55 /sbin/modprobe tcrypt sec=2 mode=201
2018-11-20 17:55:56 /sbin/modprobe tcrypt sec=2 mode=202
2018-11-20 18:00:57 /sbin/modprobe tcrypt sec=2 mode=203
2018-11-20 18:02:58 /sbin/modprobe tcrypt sec=2 mode=204



To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Rong Chen