msr from ubuntu_kvm_unit_tests failed with "FAIL: Expected #GP on WRMSR(x2APIC MSR 0x837, 0xffffffffffffffff), got vector 0"

[Po-Hsu Lin]

Like bug 2047344 (FAIL: Expected #GP on RDSMR(x2APIC MSR 0x82e))
This issue was found after updating our kvm-unit-test fork to 02d8befe99 "pretty_print_stacks: modify relative path calculation"

The number of test cases has increased from 303 to 1899.
There are 9 ~ 15 failures reported for WRMSR on older kernels (5.4).

Output example from B-oracle-5.4:
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x80f, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x832, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x833, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x834, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x835, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x836, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x837, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x838, 0xffffffffffffffff), got vector 0
 FAIL: Expected #GP on WRMSR(x2APIC MSR 0x83e, 0xffffffffffffffff), got vector 0
 FAIL msr (1899 tests, 224 unexpected failures)

9 failures with WRMSR + 215 failures for RDSMR = 224 failures

[Po-Hsu Lin (cypressyew)]

Update description based on test case change in https://gitlab.com/kvm-unit-tests/kvm-unit-tests/-/commit/784dd85d25d484e513a05a8142effc8f9ae8228e

[GuoqingJiang (guoqingjiang)]

For 5.4.0-1046.49 linux-iot, there are also some similar failures when run rt on riccioli instance [1].

FAIL: Expected #GP on WRMSR(x2APIC MSR 0x808, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x80b, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x80f, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x832, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x833, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x834, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x835, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x836, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x837, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x838, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x83e, 0xffffffffffffffff), got vector 0
FAIL: Expected #GP on WRMSR(x2APIC MSR 0x83f, 0xffffffffffffffff), got vector 0

[1] http://test-results.kernel/2025.01.13/focal/linux-iot/5.4.0-1046.49/sru-iot-metal-riccioli.amd64-ubuntu_kvm_unit_tests-log.html#msr-start