[Bug 1815263] Re: hvf accelerator crashes on quest boot

[Roman Bolshakov]

** Tags added: hvf

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https://bugs.launchpad.net/bugs/1815263

Title:
  hvf accelerator crashes on quest boot

Status in QEMU:
  New

Bug description:
  Host OS: macOS High Sierra (10.13.6)
  MacBook Pro (Retina, Mid 2015)
  Processor: 2.8GHz Intel Core i7
  Guest OS: OpenBSD 6.4 install media (install64.iso)
  Qemu 3.1.0 release, built with:
  ./configure --prefix=/usr/local/Cellar/qemu/3.1.0_1 --cc=clang
        --host-cc=clang
        --disable-bsd-user
        --disable-guest-agent
        --enable-curses
        --enable-libssh2
        --enable-vde
        --extra-cflags=-DNCURSES_WIDECHAR=1
        --enable-cocoa
        --disable-sdl
        --disable-gtk
        --enable-hvf
        --target-list=x86_64-softmmu
        --enable-debug

  I invoke qemu like this:
  Last command had exit code: 0 at 22:58
  nwallace@nwallace-ltm3:~
  $ sudo qemu-system-x86_64 -M accel=hvf -boot d -cdrom 
~/Downloads/install64.iso
  Password:
  qemu-system-x86_64: warning: host doesn't support requested feature: 
CPUID.80000001H:ECX.svm [bit 2]
  bad size

  Abort trap: 6
  Last command had exit code: 134 at 22:58
  nwallace@nwallace-ltm3:~
  $

  I ran qemu in lldb to get a stack trace and I get:
  Last command had exit code: 0 at 22:54
  nwallace@nwallace-ltm3:~/Downloads
  $ sudo lldb -- qemu-system-x86_64 -M accel=hvf -boot d -cdrom 
/Users/nwallace/Downloads/install64.iso
  Password:
  (lldb) target create "qemu-system-x86_64"
  Current executable set to 'qemu-system-x86_64' (x86_64).
  (lldb) settings set -- target.run-args  "-M" "accel=hvf" "-boot" "d" "-cdrom" 
"/Users/nwallace/Downloads/install64.i
  so"
  (lldb) run
  Process 96474 launched: '/usr/local/bin/qemu-system-x86_64' (x86_64)
  Process 96474 stopped
  * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGUSR2
      frame #0: 0x00007fff5ef0c00a libsystem_kernel.dylib`__sigsuspend + 10
  libsystem_kernel.dylib`__sigsuspend:
  ->  0x7fff5ef0c00a <+10>: jae    0x7fff5ef0c014            ; <+20>
      0x7fff5ef0c00c <+12>: movq   %rax, %rdi
      0x7fff5ef0c00f <+15>: jmp    0x7fff5ef02b0e            ; cerror
      0x7fff5ef0c014 <+20>: retq
  Target 0: (qemu-system-x86_64) stopped.
  (lldb) process handle SIGUSR1 -n true -p true -s false
  NAME         PASS   STOP   NOTIFY
  ===========  =====  =====  ======
  SIGUSR1      true   false  true
  (lldb) process handle SIGUSR2 -n true -p true -s false
  NAME         PASS   STOP   NOTIFY
  ===========  =====  =====  ======
  SIGUSR2      true   false  true
  (lldb) c
  Process 96474 resuming
  qemu-system-x86_64: warning: host doesn't support requested feature: 
CPUID.80000001H:ECX.svm [bit 2]
  Process 96474 stopped and restarted: thread 9 received signal: SIGUSR2
  <line above repeats about 64 times or so>
  Process 96474 stopped and restarted: thread 9 received signal: SIGUSR2
  bad size

  Process 96474 stopped
  * thread #9, stop reason = signal SIGABRT
      frame #0: 0x00007fff5ef0bb66 libsystem_kernel.dylib`__pthread_kill + 10
  libsystem_kernel.dylib`__pthread_kill:
  ->  0x7fff5ef0bb66 <+10>: jae    0x7fff5ef0bb70            ; <+20>
      0x7fff5ef0bb68 <+12>: movq   %rax, %rdi
      0x7fff5ef0bb6b <+15>: jmp    0x7fff5ef02ae9            ; cerror_nocancel
      0x7fff5ef0bb70 <+20>: retq
  Target 0: (qemu-system-x86_64) stopped.
  (lldb) bt
  * thread #9, stop reason = signal SIGABRT
    * frame #0: 0x00007fff5ef0bb66 libsystem_kernel.dylib`__pthread_kill + 10
      frame #1: 0x00007fff5f0d6080 libsystem_pthread.dylib`pthread_kill + 333
      frame #2: 0x00007fff5ee671ae libsystem_c.dylib`abort + 127
      frame #3: 0x000000010016b6ec qemu-system-x86_64`exec_cmps_single + 400
      frame #4: 0x000000010016ada4 qemu-system-x86_64`exec_cmps + 65
      frame #5: 0x0000000100169aaa qemu-system-x86_64`exec_instruction + 48
      frame #6: 0x0000000100164eb2 qemu-system-x86_64`hvf_vcpu_exec + 2658
      frame #7: 0x000000010005bed6 qemu-system-x86_64`qemu_hvf_cpu_thread_fn + 
200
      frame #8: 0x00000001003ee531 qemu-system-x86_64`qemu_thread_start + 107
      frame #9: 0x00007fff5f0d3661 libsystem_pthread.dylib`_pthread_body + 340
      frame #10: 0x00007fff5f0d350d libsystem_pthread.dylib`_pthread_start + 377
      frame #11: 0x00007fff5f0d2bf9 libsystem_pthread.dylib`thread_start + 13
  (lldb) quit
  Quitting LLDB will kill one or more processes. Do you really want to proceed: 
[Y/n] Y
  Last command had exit code: 0 at 23:01
  nwallace@nwallace-ltm3:~/Downloads
  $

  
  I'm happy to work with someone more knowledgeable to reproduce this issue and 
provide debugging assistance as I'm able.

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