Greeting, FYI, we noticed the following commit (built with gcc-9): commit: fad41fa05876489d76b884c83014b80731e0f60f ("[PATCH 6/6] selftests: kvm: test enforcement of paravirtual cpuid features") url: https://github.com/0day-ci/linux/commits/Oliver-Upton/Some-fixes-and-a-te... base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git ed8780e3f2ecc82645342d070c6b4e530532e680 in testcase: kernel-selftests version: kernel-selftests-x86_64-b5a583fb-1_20201015 with following parameters: group: kselftests-kvm ucode: 0xdc 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: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G 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; gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/assert.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/assert.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/elf.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/elf.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/io.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/io.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/kvm_util.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/kvm_util.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/sparsebit.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/sparsebit.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib -Iinclude/x86_64 -I.. -c lib/test_util.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/test_util.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib/x86_64 -Iinclude/x86_64 -I.. -c lib/x86_64/processor.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/processor.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib/x86_64 -Iinclude/x86_64 -I.. -c lib/x86_64/vmx.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/vmx.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib/x86_64 -Iinclude/x86_64 -I.. -c lib/x86_64/svm.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/svm.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ilib/x86_64 -Iinclude/x86_64 -I.. -c lib/x86_64/ucall.c -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/ucall.o ar crs /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/libkvm.a /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/assert.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/elf.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/io.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/kvm_util.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/sparsebit.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/test_util.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/processor.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/vmx.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/svm.o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/lib/x86_64/ucall.o gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/cr4_cpuid_sync_test.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest_harness.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/evmcs_test.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest_harness.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/evmcs_test gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/hyperv_cpuid.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest_harness.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/hyperv_cpuid gcc -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 -fno-stack-protector -fno-PIE -I../../../../tools/include -I../../../../tools/arch/x86/include -I../../../../usr/include/ -Iinclude -Ix86_64 -Iinclude/x86_64 -I.. -pthread -no-pie x86_64/kvm_pv_test.c /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest_harness.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kselftest.h /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/libkvm.a -o /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/kvm_pv_test x86_64/kvm_pv_test.c:47:37: warning: ‘struct ex_regs’ declared inside parameter list will not be visible outside of this definition or declaration static void guest_gp_handler(struct ex_regs *regs) ^~~~~~~ x86_64/kvm_pv_test.c: In function ‘guest_gp_handler’: x86_64/kvm_pv_test.c:49:44: error: dereferencing pointer to incomplete type ‘struct ex_regs’ unsigned char *rip = (unsigned char *)regs->rip; ^~ x86_64/kvm_pv_test.c: In function ‘main’: x86_64/kvm_pv_test.c:228:2: warning: implicit declaration of function ‘vm_init_descriptor_tables’ [-Wimplicit-function-declaration] vm_init_descriptor_tables(vm); ^~~~~~~~~~~~~~~~~~~~~~~~~ x86_64/kvm_pv_test.c:229:2: warning: implicit declaration of function ‘vcpu_init_descriptor_tables’ [-Wimplicit-function-declaration] vcpu_init_descriptor_tables(vm, VCPU_ID); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ x86_64/kvm_pv_test.c:230:2: warning: implicit declaration of function ‘vm_handle_exception’ [-Wimplicit-function-declaration] vm_handle_exception(vm, GP_VECTOR, guest_gp_handler); ^~~~~~~~~~~~~~~~~~~ make: *** [../lib.mk:139: /usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/kvm_pv_test] Error 1 make: *** Deleting file '/usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm/x86_64/kvm_pv_test' make: Leaving directory '/usr/src/perf_selftests-x86_64-rhel-7.6-kselftests-fad41fa05876489d76b884c83014b80731e0f60f/tools/testing/selftests/kvm' 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