diag308 from ubuntu_kvm_unit_tests failed on X-4.4 s390x

[Po-Hsu Lin]

Issue found on X 4.4.0-215.247 s390x zVM

Test failed with:
Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/diag308'
 BUILD_HEAD=1593e88a
 timeout -k 1s --foreground 90s /usr/bin/qemu-system-s390x -nodefaults -nographic -machine s390-ccw-virtio,accel=kvm -chardev stdio,id=con0 -device sclpconsole,chardev=con0 -kernel /tmp/tmp.gDDfLCz5c3 -smp 1 # -initrd /tmp/tmp.X2Ojdb6nZO
 PASS: diag308: privileged: Program interrupt: expected(2) == received(2)
 PASS: diag308: subcode 0: load modified clear done
 PASS: diag308: subcode 1: load normal reset done
 PASS: diag308: subcode 5: uneven register: Program interrupt: expected(6) == received(6)
 PASS: diag308: subcode 5: unaligned address: Program interrupt: expected(6) == received(6)
 PASS: diag308: subcode 6: uneven register: Program interrupt: expected(6) == received(6)
 PASS: diag308: subcode 6: unaligned address: Program interrupt: expected(6) == received(6)
 qemu: hardware error: Unhandled diag308 subcode 2
 CPU #0:
 PSW=mask 0000200180000000 addr 000000000001104c cc 00
 R00=0000000000000000 R01=0000000000028092 R02=000000000000001e R03=0000000000000000
 R04=0000000000011042 R05=000000000003fd20 R06=0000000000000000 R07=0000000000000000
 R08=0000000000000000 R09=0000000000000000 R10=0000000000000002 R11=000000000003feac
 R12=0000000000000005 R13=0000000000000000 R14=0000000000011048 R15=000000000003fe08
 F00=0000000000000100 F01=0000000000000000 F02=0000000000023d72 F03=0000000000000000
 F04=0000000000000002 F05=0000000000000000 F06=0000000000000000 F07=0000000000000000
 F08=0000000000000000 F09=0000000000000000 F10=0000000000000000 F11=0000000000000000
 F12=0000000000000000 F13=0000000000000000 F14=0000000000000000 F15=0000000000000000
 V00=00000000000001000000000000000000 V01=00000000000000000000000000000000
 V02=0000000000023d720000000000000000 V03=00000000000000000000000000000000
 V04=00000000000000020000000000000000 V05=00000000000000000000000000000000
 V06=00000000000000000000000000000000 V07=00000000000000000000000000000000
 V08=00000000000000000000000000000000 V09=00000000000000000000000000000000
 V10=00000000000000000000000000000000 V11=00000000000000000000000000000000
 V12=00000000000000000000000000000000 V13=00000000000000000000000000000000
 V14=00000000000000000000000000000000 V15=00000000000000000000000000000000
 V16=00000000000000000000000000000000 V17=00000000000000000000000000000000
 V18=00000000000000000000000000000000 V19=00000000000000000000000000000000
 V20=00000000000000000000000000000000 V21=00000000000000000000000000000000
 V22=00000000000000000000000000000000 V23=00000000000000000000000000000000
 V24=00000000000000000000000000000000 V25=00000000000000000000000000000000
 V26=00000000000000000000000000000000 V27=00000000000000000000000000000000
 V28=00000000000000000000000000000000 V29=00000000000000000000000000000000
 V30=00000000000000000000000000000000 V31=00000000000000000000000000000000
 C00=0000000000040000 C01=0000000000000000 C02=0000000000000000 C03=0000000000000000
 C04=0000000000000000 C05=0000000000000000 C06=0000000000000000 C07=0000000000000000
 C08=0000000000000000 C09=0000000000000000 C10=0000000000000000 C11=0000000000000000
 C12=0000000000000000 C13=0000000000000000 C14=00000000c2000000 C15=0000000000000000

 timeout: the monitored command dumped core
 QEMU Aborted
 FAIL diag308 (terminated on SIGABRT)

This is not a regression, this failure can be found on 4.4.0-214.246 s390x as well.