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[Po-Hsu Lin <2022892@xxxxxxxxxxxxxxxxxx>]

** Tags added: ubuntu-kvm-unit-tests

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https://bugs.launchpad.net/bugs/2022892

Title:
  emulator in ubuntu_kvm_unit_test timeout with "jump to non-canonical
  address" test with J-realtime on openstack AMD64

Status in ubuntu-kernel-tests:
  New
Status in linux-realtime package in Ubuntu:
  New

Bug description:
  emulator test in ubuntu_kvm_unit_test will timeout with J-realtime on
  openstack amd64 instance. This issue can be seen after we start
  testing on openstack with 5.15.0-1036.39 in sru-20230320.

  Test log:
   Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/emulator'
   BUILD_HEAD=d8edb59a
   timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=tcg -kernel /tmp/tmp.ZwF6eq54JA -smp 1 # -initrd /tmp/tmp.zaTVj0FnC8
   enabling apic
   smp: waiting for 0 APs
   SKIP: Skipping tests the require forced emulation, use kvm.force_emulation_prefix=1 to enable
   paging enabled
   cr0 = 80010011
   cr3 = 1007000
   cr4 = 20
   PASS: mov reg, r/m (1)
   PASS: or
   PASS: add
   PASS: xor
   PASS: sub
   PASS: adc(0)
   PASS: adc(0)
   PASS: sbb(0)
   PASS: sbb(1)
   PASS: and
   PASS: test
   PASS: repe/cmpsb (1)
   PASS: repe cmpsb (1.zf)
   PASS: repe cmpsw (1)
   PASS: repe cmpll (1)
   PASS: repe cmpsq (1)
   PASS: repe cmpsb (2)
   PASS: repe cmpsw (2)
   PASS: repe cmpll (2)
   PASS: repe cmpsq (2)
   PASS: repe/cmpsb (1)
   PASS: repe cmpsb (1.zf)
   PASS: repe cmpsw (1)
   PASS: repe cmpll (1)
   PASS: repe cmpsq (1)
   PASS: repe cmpsb (2)
   PASS: repe cmpsw (2)
   PASS: repe cmpll (2)
   PASS: repe cmpsq (2)
   PASS: scasb match
   PASS: scasb mismatch
   PASS: scasw match
   PASS: scasw mismatch
   PASS: scasd match
   PASS: scasd mismatch
   PASS: scasq match
   PASS: scasq mismatch
   PASS: smsw (1)
   PASS: smsw (2)
   PASS: smsw (3)
   before 80010011 after 80010019
   PASS: lmsw (1)
   before 80010011 after 80010011
   PASS: lmsw (2)
   PASS: lmsw (3)
   PASS: outsb up
   PASS: outsb down
   PASS: incl
   PASS: decl
   PASS: incb
   PASS: decb
   PASS: lock incl
   PASS: lock decl
   PASS: lock incb
   PASS: lock decb
   PASS: lock negl
   PASS: lock notl
   PASS: lock negb
   PASS: lock notb
   PASS: btcl imm8, r/m
   PASS: btcl reg, r/m
   PASS: btcq reg, r/m
   PASS: bsfw r/m, reg
   PASS: bsfl r/m, reg
   PASS: bsfq r/m, reg
   PASS: bsfq r/m, reg
   PASS: bsrw r/m, reg
   PASS: bsrl r/m, reg
   PASS: bsrq r/m, reg
   PASS: bsrq r/m, reg
   PASS: imul ax, mem
   PASS: imul eax, mem
   PASS: imul ax, mem, imm8
   PASS: imul eax, mem, imm8
   PASS: imul ax, mem, imm
   PASS: imul eax, mem, imm
   PASS: imul rax, mem
   PASS: imul rax, mem, imm8
   PASS: imul rax, mem, imm
   PASS: movdqu (read)
   PASS: movdqu (write)
   PASS: movaps (read)
   PASS: movaps (write)
   PASS: movapd (read)
   PASS: movapd (write)
   PASS: movups (read)
   PASS: movups (write)
   PASS: movupd (read)
   PASS: movupd (write)
   PASS: movups unaligned
   PASS: movupd unaligned
   FAIL: unaligned movaps exception
   PASS: movups unaligned crosspage
   PASS: movups crosspage exception
   PASS: shld (cl)
   PASS: shrd (cl)
   PASS: ltr
   PASS: cross-page mmio read
   PASS: cross-page mmio write
   PASS: string_io_mmio
   SKIP: MOVBE unsupported by CPU
   PASS: no fep: #DB occurred after MOV SS
   PASS: push $imm8
   PASS: push %reg
   PASS: push mem
   PASS: push $imm
   PASS: pop mem
   PASS: pop mem (2)
   PASS: pop reg
   PASS: ret
   PASS: leave
   PASS: enter
   PASS: xchg reg, r/m (1)
   PASS: xchg reg, r/m (2)
   PASS: xchg reg, r/m (3)
   PASS: xchg reg, r/m (4)
   PASS: xadd reg, r/m (1)
   PASS: xadd reg, r/m (2)
   PASS: xadd reg, r/m (3)
   PASS: xadd reg, r/m (4)
   PASS: mov %cr8
   PASS: ljmp
   PASS: divq (fault)
   PASS: divq (1)
   PASS: mulb mem
   PASS: mulw mem
   PASS: mull mem
   PASS: mulq mem
   PASS: movq (mmx, read)
   PASS: movq (mmx, write)
   PASS: movb $imm, 0(%rip)
   PASS: Test ret/iret with a nullified segment
   PASS: mov null, %ss
   FAIL: mov null, %ss (with ss.rpl != cpl)
   PASS: cmovnel
   PASS: push16
   qemu-system-x86_64: terminating on signal 15 from pid 9798 (timeout)
   FAIL emulator (timeout; duration=90s)

  Bump the timeout to 180 seconds does not help. This issue still exist
  with the latest upstream kvm-unit-tests code (02d8befe99f8)

  It's the test_jmp_noncanonical() test in test_emulator_64() that cause
  this hang. Comment it out can make this test finish properly.

  It's worthy to note that this test has passed with j/ibm on openstack
  amd64.

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