[Bug 154215] Re: gnome no window manager

[Kevin Locke]

How did you install Gnome?  Which window managers do you have installed
(e.g. metacity)?  If you try starting a window manager after logging in
(i.e. from an xterm), does it start without problems?

Do you have compiz installed?  I just ran across a problem on Hardy
where gnome-wm makes bad decisions when compiz is not installed (since
compiz is its default).  I have attached a patch which fixes that
problem (compiz is selected regardless of whether or not it is
installed) - but I am not sure if that is the problem you are
experiencing.

** Attachment added: Make gnome-wm check executability of $DEFWM before using 
it
   http://launchpadlibrarian.net/11967721/gnome-session_test-wm-executable.patch

** Also affects: gnome-session
   Importance: Undecided
   Status: New

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[Bug 637556] Re: os.execve should get passed program as first argument

[Kevin Locke]

** Branch linked: lp:~kevinoid/duplicity/windows-port

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os.execve should get passed program as first argument
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[Bug 1498832] Re: invalid file (bad magic number): Exec format error

[Kevin Locke]

I just ran into this issue with a self-compiled jar file and confirmed
that I have the same issue with ditaa on Debian.  Checking the
binfmt_misc configuration may be useful.  To see what interpreters will
be tried by binfmt_misc, run `/usr/sbin/update-binfmts --find
/usr/bin/ditaa`.  Then try running the interpreter with the jar file
directly (e.g. `/usr/bin/jarwrapper /usr/bin/ditaa`) to see if it works.

If update-binfmts does not print anything, that suggests either
corruption of the JAR file (check `od -An -tx1 -N4
/usr/share/ditaa/ditaa.jar` is `50 4b 03 04`) or that jarwrapper is not
correctly registered (check `/usr/sbin/update-binfmts --display
jarwrapper` prints `jarwrapper (enabled)`).

If update-binfmts prints `/usr/bin/jexec` (or anything else) in addition
to `jarwrapper` and those interpreters do not work, this suggests
conflicting binfmt_misc registrations.  Check the output of `/usr/sbin
/update-binfmts --display` to find out which package installed it.  You
can then remove it by running something like `sudo update-binfmts
--package openjdk-8 --remove jar /usr/bin/jexec`.

The issue, as it appeared on my system, was that the openjdk packages
(e.g. openjdk-8-jre-headless) install /usr/bin/jexec as a binfmt_misc
handler but jexec doesn't work with this jar.  Java version mismatch
perhaps?  I found the issue of jexec/jarwrapper conflict has been raised
before at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=136993#82
without response.  Perhaps it's time to raise it again?  I'd reassign
this bug to openjdk-8-jre-headless.

** Bug watch added: Debian Bug tracker #136993
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=136993

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Title:
  invalid file (bad magic number): Exec format error

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[Bug 1498832] Re: invalid file (bad magic number): Exec format error

[Kevin Locke]

See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855858

** Bug watch added: Debian Bug tracker #855858
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855858

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Title:
  invalid file (bad magic number): Exec format error

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[Bug 1210748] Re: On Lenovo Thinkpad Twist internal mouse does not work after turning on machine, only works after reboot

[Kevin Locke]

I encountered the same issue and was able to solve it by adding
i8042.reset=1 to the kernel command line.  i8042.nomux was not necessary
for me.

The quirk was committed in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2712c91a54a1058d55c284152b4d93c979b67be6
which is included in Linux 5.7.  It has also been merged into stable for
the upcoming v5.6.16, v5.4.44, v4.19.126, v4.14.183, v4.9.226, and
v4.4.226.

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Title:
  On Lenovo Thinkpad Twist internal mouse does not work after turning on
  machine, only works after reboot

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[Bug 1851062] Re: Qemu using CPU even when the VM is paused

[Kevin Locke]

I re-opened the discussion that @Christian found on the kvm mailing list
and Paolo Bonzini helped identify a fix: enabling the Hyper-V hv_stimer
enlightenment.

Although it may not fix the issue for guests which don't support that
enlightenment, it works well for my Windows 10 guest, which now has
negligible CPU usage when paused.

I've also opened https://bugzilla.redhat.com/1851244 to discuss
improving the virt-manager/virt-install defaults for Windows guests.

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Title:
  Qemu using CPU even when the VM is paused

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[Bug 1851062] Re: Qemu using CPU even when the VM is paused

[Kevin Locke]

I just ran into what I think is the same issue.  Windows 10 VM
controlled from virt-manager using ~30% CPU while paused.

I'm attaching the output of
pidstat -p $(pidof qemu-system-x86_64) -T ALL -rtuw 5 5
and the first thousand lines of
strace -rT -ff -f -o paused-but-busy -p $(pidof qemu-system-x86_64)
that you requested from the other reporter.  As a non-expert, the repeated 
calls to ioctl(10, KVM_IRQ_LINE_STATUS, ...)+ppoll() timeout seem suggestive to 
me.

Note: I'm omitting strace for all threads except the one consuming the
CPU, since they each contain a single futex() call.  If you'd like to
see the futex addr/val, let me know.

Thanks for investigating,
Kevin

Full disclosure: I'm using Debian rather than Ubuntu.  If you'd like me
to repro using the Ubuntu package versions (or on a fully Ubuntu system)
I can give it a shot.  Currently using qemu-system-x86 1:5.0-5, libvirt
6.0.0-6, and virt-manager 1:2.2.1-4.

** Attachment added: "strace from high-CPU thread of paused Windows 10 VM"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1851062/+attachment/5386879/+files/qemu-high-cpu.strace

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Title:
  Qemu using CPU even when the VM is paused

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[Bug 1851062] Re: Qemu using CPU even when the VM is paused

[Kevin Locke]

** Attachment added: "pidstat concurrent with strace for high-CPU thread of 
paused Windows 10 VM"
   
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1851062/+attachment/5386880/+files/qemu-high-cpu.pidstat

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Title:
  Qemu using CPU even when the VM is paused

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[Bug 1851062] Re: Qemu using CPU even when the VM is paused

[Kevin Locke]

I agree that QEMU shouldn't use much CPU when paused, regardless of VM
settings.  For reference, I narrowed down a (more) minimal test case:

Using the Windows 10 May 2020 English 64-bit ISO from
https://www.microsoft.com/en-us/software-download/windows10ISO

qemu-system-x86_64 \
-no-user-config \
-machine pc-q35-5.0,accel=kvm \
-m 1024 \
-blockdev 
driver=file,node-name=win10iso,filename=Win10_2004_English_x64.iso \
-device ide-cd,drive=win10iso \
-no-hpet \
-rtc driftfix=slew

then pause the VM after the "Windows Setup" window appears, qemu-system-
x86_64 uses ~40% CPU.  Without -rtc driftfix=slew, ~10%.  Without -no-
hpet, ~1%.

I added it to the ML discussion this morning to see if there was
interest in fixing the issue, but so far no takers:
https://lore.kernel.org/kvm/20200626151432.GA231100@kevinolos/

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Title:
  Qemu using CPU even when the VM is paused

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