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

commit: 7b5b51e7b3a988741f7f34d5148f1f4fea86434a ("[PATCH v6 11/11] arm64: annotate user pointers casts detected by sparse")
url: https://github.com/0day-ci/linux/commits/Andrey-Konovalov/arm64-untag-user-pointers-passed-to-the-kernel/20180831-042151


in testcase: kvm-unit-tests
with following parameters:




on test machine: qemu-system-x86_64 -enable-kvm -cpu IvyBridge -smp 4 -m 2G

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




ignored_by_lkp: pku
ignored_by_lkp: taskswitch
ignored_by_lkp: vmware_backdoors
2018-09-13 17:39:56 ./run_tests.sh
FAIL apic-split (timeout; duration=90s)
SKIP ioapic-split (qemu: could not load kernel '_NO_FILE_4Uhere_': No such file or directory)
FAIL apic (timeout; duration=30)
PASS ioapic (19 tests)
PASS smptest (1 tests)
SKIP smptest3 (Try '�=p� --help' for more information.)
SKIP vmexit_cpuid (You can set a custom location by using the QEMU=<path> environment variable.)
FAIL vmexit_vmcall 
FAIL vmexit_mov_from_cr8 
FAIL vmexit_mov_to_cr8 
PASS vmexit_inl_pmtimer 
SKIP vmexit_ipi (: '': No such file or directory)
SKIP vmexit_ipi_halt (: '': No such file or directory)
SKIP vmexit_ple_round_robin (You can set a custom location by using the QEMU=<path> environment variable.)
FAIL vmexit_tscdeadline (terminated on SIGPIPE)
SKIP vmexit_tscdeadline_immed (No Qemu test device support found)
SKIP access (qemu-system-x86_64: CPU model 'host' requires KVM)
SKIP smap (You can set a custom location by using the QEMU=<path> environment variable.)
FAIL emulator 
SKIP eventinj (You can set a custom location by using the QEMU=<path> environment variable.)
FAIL hypercall (timeout; duration=90s)
PASS idt_test 
SKIP memory (�: : No such file or directory)
FAIL msr 
SKIP pmu (qemu-system-x86_64: CPU model 'host' requires KVM)
PASS port80 
FAIL realmode 
SKIP s3 (Try '� --help' for more information.)
FAIL sieve 
FAIL syscall wrong CS (0x08)!)
FAIL: syscall TF handling)
(2 tests, 1 unexpected failures)
SKIP tsc (You can set a custom location by using the QEMU=<path> environment variable.)
SKIP tsc_adjust (qemu-system-x86_64: CPU model 'host' requires KVM)
SKIP xsave (qemu-system-x86_64: CPU model 'host' requires KVM)
FAIL rmap_chain 
FAIL svm (10 tests, 4 unexpected failures)



To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
Rong, Chen