[Qemu-devel] [Bug 1714331] Re: Virtual machines not working anymore on 2.10

[Chris Unsworth]

I think my issue looks like the same.  Sometimes I just get spinning
dots, and sometimes there is the message about doing an automatic repair
below the spinning dots before it stops and uses 100% cpu.  I just did a
git bisect:

# git bisect log
# bad: [1ab5eb4efb91a3d4569b0df6e824cc08ab4bd8ec] Update version for v2.10.0 
release
# good: [6c02258e143700314ebf268dae47eb23db17d1cf] Update version for v2.9.0 
release
git bisect start 'v2.10.0' 'v2.9.0'
# bad: [269c20b2bbd2aa8531e0cdc741fb166f290d7a2b] tests/qdict: check more 
get_try_int() cases
git bisect bad 269c20b2bbd2aa8531e0cdc741fb166f290d7a2b
# bad: [eba0161990af8509608332450ee7e338273cf5df] Merge remote-tracking branch 
'rth/tags/pull-s390-20170512' into staging
git bisect bad eba0161990af8509608332450ee7e338273cf5df
# good: [9ea5ada76f34a0ef048b131c3a166d8564199bdb] audio: Use ARRAY_SIZE from 
qemu/osdep.h
git bisect good 9ea5ada76f34a0ef048b131c3a166d8564199bdb
# bad: [1effe6ad5eac1b2e50a077695ac801d172891d6a] Merge remote-tracking branch 
'danpb/tags/pull-qcrypto-2017-05-09-1' into staging
git bisect bad 1effe6ad5eac1b2e50a077695ac801d172891d6a
# good: [f03f9f0c10dcfadee5811d43240f0a6af230f1ce] Merge remote-tracking branch 
'cohuck/tags/s390x-3270-20170504' into staging
git bisect good f03f9f0c10dcfadee5811d43240f0a6af230f1ce
# good: [6c02258e143700314ebf268dae47eb23db17d1cf] qobject-input-visitor: 
Document full_name_nth()
git bisect good 6c02258e143700314ebf268dae47eb23db17d1cf
# bad: [95615ce5a1beffff1a5dd3597d8cb6ba83f0010e] vhost-scsi: create a 
vhost-scsi-common abstraction
git bisect bad 95615ce5a1beffff1a5dd3597d8cb6ba83f0010e
# bad: [31f5a726b59bda5580e2f9413867893501dd7d93] trace: add qemu mutex lock 
and unlock trace events
git bisect bad 31f5a726b59bda5580e2f9413867893501dd7d93
# bad: [49e00a18708e27c815828d9440d5c9300d19547c] use _Static_assert in 
QEMU_BUILD_BUG_ON
git bisect bad 49e00a18708e27c815828d9440d5c9300d19547c
# bad: [6103451aeb749e92bf7d730429985189c6921c32] hw/i386: Build-time assertion 
on pc/q35 reset register being identical.
git bisect bad 6103451aeb749e92bf7d730429985189c6921c32
# bad: [77af8a2b95b79699de650965d5228772743efe84] hw/i386: Use Rev3 FADT (ACPI 
2.0) instead of Rev1 to improve guest OS support.
git bisect bad 77af8a2b95b79699de650965d5228772743efe84
# first bad commit: [77af8a2b95b79699de650965d5228772743efe84] hw/i386: Use 
Rev3 FADT (ACPI 2.0) instead of Rev1 to improve guest OS support.


77af8a2b95b79699de650965d5228772743efe84 is the first bad commit
commit 77af8a2b95b79699de650965d5228772743efe84
Author: Phil Dennis-Jordan <address@hidden>
Date:   Wed Mar 15 19:20:26 2017 +1300

    hw/i386: Use Rev3 FADT (ACPI 2.0) instead of Rev1 to improve guest
OS support.

    This updates the FADT generated for x86/64 machine types from
Revision 1 to 3. (Based on ACPI standard 2.0 instead of 1.0) The
intention is to expose the reset register information to guest operating
systems which require it, specifically OS X/macOS. Revision 1 FADTs do
not contain the fields relating to the reset register.

    The new layout and contents remains backwards-compatible with
operating systems which only support ACPI 1.0, as the existing fields
are not modified by this change, as the 64-bit and 32-bit variants are
allowed to co-exist according to the ACPI 2.0 standard. No regressions
became apparent in tests with a range of Windows (XP-10) and Linux
versions.

    The BIOS tables test suite's FADT checksum test has also been
updated to reflect the new FADT layout and content.

    Signed-off-by: Phil Dennis-Jordan <address@hidden>
    Message-Id: <address@hidden>
    Signed-off-by: Paolo Bonzini <address@hidden>

:040000 040000 40063761c0b86f87e798e03ea48eff9ea0753425 
6d2a94150cf1eafb16f0ccf6325281415fef64a6 M      hw
:040000 040000 fe3f1480a91b76fea238c765f0725e715932d96d 
68f9368d8d78fd3267f609b603f97e8a74bdf528 M      include
:040000 040000 895e961b0a160100aa95b2f557cfe6b87a7d9bff 
8ed08cef10fddee7814e38ad62be11371592a75a M      tests

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https://bugs.launchpad.net/bugs/1714331

Title:
  Virtual machines not working anymore on 2.10

Status in QEMU:
  New

Bug description:
  Using 2.10, my virtual machine(s) don't work anymore. This happens
  100% of the times.

  -----

  I use QEMU compiling it from source, on Ubuntu 16.04 amd64. This is
  the configure command:

      configure --target-list=x86_64-softmmu --enable-debug --enable-gtk
  --enable-spice --audio-drv-list=pa

  I have one virtual disk, with a Windows 10 64-bit, which I launch in
  two different ways; both work perfectly on 2.9 (and used to do on 2.8,
  but I haven't used it for a long time).

  This is the first way:

      qemu-system-x86_64
        -drive if=pflash,format=raw,readonly,file=/path/to/OVMF_CODE.fd
        -drive if=pflash,format=raw,file=/tmp/OVMF_VARS.fd.tmp
        -enable-kvm
        -machine q35,accel=kvm,mem-merge=off
        -cpu 
host,kvm=off,hv_vendor_id=vgaptrocks,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time
        -smp 4,cores=4,sockets=1,threads=1
        -m 4096
        -display gtk
        -vga qxl
        -rtc base=localtime
        -serial none
        -parallel none
        -usb
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device virtio-scsi-pci,id=scsi
        -drive 
file=/path/to/image-diff.img,id=hdd1,format=qcow2,if=none,cache=writeback
        -device scsi-hd,drive=hdd1
        -net nic,model=virtio
        -net user

  On QEMU 2.10, I get the `Recovery - Your PC/Device needs to be
  repaired` windows screen; on 2.9, it boots regularly.

  This is the second way:

      qemu-system-x86_64
        -drive if=pflash,format=raw,readonly,file=/path/to/OVMF_CODE.fd
        -drive if=pflash,format=raw,file=/tmp/OVMF_VARS.fd.tmp
        -enable-kvm
        -machine q35,accel=kvm,mem-merge=off
        -cpu 
host,kvm=off,hv_vendor_id=vgaptrocks,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time
        -smp 4,cores=4,sockets=1,threads=1
        -m 10240
        -vga none
        -rtc base=localtime
        -serial none
        -parallel none
        -usb
        -device vfio-pci,host=01:00.0,multifunction=on
        -device vfio-pci,host=01:00.1
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device usb-host,vendorid=0xNNNN,productid=0xNNNN
        -device virtio-scsi-pci,id=scsi
        -drive 
file=/path/to/image-diff.img,id=hdd1,format=qcow2,if=none,cache=writeback
        -device scsi-hd,drive=hdd1
        -net nic,model=virtio
        -net user

  On QEMU 2.10, I get the debug window on the linux monitor, and blank screen 
on VFIO one (no BIOS screen at all); after 10/20 seconds, QEMU crashes without 
any message.
  On 2.9, this works perfectly.

  -----

  I am able to perform a git bisect, if that helps, but if this is the
  case, I'd need this issue to be reviewed, since bisecting is going to
  take me a lot of time.

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