FYI, we noticed the following commit: commit: 5649645d725c73df4302428ee4e02c869248b4c5 ("KEYS: fix dereferencing NULL payload with nonzero length") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: ltp with following parameters: test: syscalls_part1 test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features. test-url: http://linux-test-project.github.io/ on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 64G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): user :notice: [ 55.064668] <<<test_start>>> user :notice: [ 55.065023] tag=add_key02 stime=1498795561 user :notice: [ 55.065254] cmdline="add_key02" user :notice: [ 55.065376] contacts="" user :notice: [ 55.065520] analysis=exit user :notice: [ 55.065711] <<<test_output>>> user :notice: [ 55.066308] tst_test.c:878: INFO: Timeout per run is 0h 05m 00s user :notice: [ 55.067232] add_key02.c:65: FAIL: add_key() failed unexpectedly, expected EINVAL: EFAULT To reproduce: git clone https://github.com/01org/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong