Subject: ppc64le kunit test failure: guest_state_buffer_test

From: Eric Biggers <[email-masked]>
Date: Tue, 2 Jun 2026 23:42:25 -0700

FYI, the KUnit test arch/powerpc/kvm/test-guest-state-buffer.c is
failing when run in QEMU PPC64LE:

[  146.554299][    T1]     KTAP version 1^M
[  146.554348][    T1]     # Subtest: guest_state_buffer_test^M
[  146.554543][    T1]     # module: test_guest_state_buffer^M
[  146.554927][    T1]     1..7^M
[  146.556873][    T1]     ok 1 test_creating_buffer^M
[  146.558221][    T1]     ok 2 test_adding_element^M
[  146.559532][    T1]     ok 3 test_gs_bitmap^M
[  146.560309][    T1]     ok 4 test_gs_parsing^M
[  146.561246][    T1]     ok 5 test_gs_msg^M
[  146.562116][    T1]     ok 6 test_gs_hostwide_msg^M
[  146.562911][  T428]     # test_gs_hostwide_counters: ASSERTION FAILED at arch/powerpc/kvm/test-guest-state-buffer.c:488^M
[  146.562911][  T428]     Expected rc == 0, but^M
[  146.562911][  T428]         rc == -2 (0xfffffffffffffffe)^M
[  146.563600][    T1]     not ok 7 test_gs_hostwide_counters^M
[  146.563653][    T1] # guest_state_buffer_test: pass:6 fail:1 skip:0 total:7^M

Tested on next-20260602.  I haven't bisected it.

Note that this test is in the defconfig.

- Eric