FYI, we noticed the following commit (built with gcc-7): commit: 7d6e56f15f94197dc0a663f64c4fb1da9bd9830f ("[PATCH] KVM: selftests: Fix parameter order error in kvm_create_max_vcpus") url: https://github.com/0day-ci/linux/commits/Tianjia-Zhang/KVM-selftests-Fix-... base: https://git.kernel.org/cgit/virt/kvm/kvm.git linux-next in testcase: kernel-selftests with following parameters: group: kselftests-01 ucode: 0xd6 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; # selftests: kvm: kvm_create_max_vcpus # ==== Test Assertion Failure ==== # lib/kvm_util.c:855: vcpu->fd >= 0 # pid=28849 tid=28849 - Invalid argument # 1 0x0000000000401b41: vm_vcpu_add at kvm_util.c:854 # 2 0x0000000000401244: test_vcpu_creation at kvm_create_max_vcpus.c:34 (discriminator 3) # 3 0x00000000004010a3: main at kvm_create_max_vcpus.c:62 # 4 0x00007f747b016e0a: ?? ??:0 # 5 0x0000000000401119: _start at ??:? # KVM_CREATE_VCPU failed, rc: -1 errno: 22 # KVM_CAP_MAX_VCPU_ID: 1023 # KVM_CAP_MAX_VCPUS: 288 # Testing creating 288 vCPUs, with IDs 0...287. # Testing creating 735 vCPUs, with IDs 288...1022. not ok 20 selftests: kvm: kvm_create_max_vcpus # exit=254 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