[Qemu-devel] apparently missing yet another notify_event()

[Michael Tokarev <mjt@tls.msk.ru>]

There's a new bugreport filed against qemu-kvm in debian,
which looks very similar to what we already had before --
https://bugs.launchpad.net/qemu/+bug/1021649
which were fixed by adding qemu_notify_event() call.
Later on these qemu_notify_event() calls become unnecessary
as far as I remember.

But here is a new one.

 qemu -nographic -kernel /boot/vmlinuz-$(uname -r) -append console=ttyS0 -serial pty

This will hang with 100% CPU usage until something is sent
to the pty.  <Enter> key is enough.

It does the same on qemu and kvm, with and without -enable-kvm,
and it looks pretty much like another forgotten notify_event.
And it happens on 1.1 and 1.2-tobe (today qemu/master), so should
be fixed before 1.2 is released.

Note: libvirt uses pty-redirected serial port heavily, and this
is where the users are hit, exactly.

The longer -serial specification (-chardev pty, -device isa-serial)
triggers it too.

What's missing this time?

(http://bugs.debian.org/686524 is the original bugreport).

Thanks,

/mjt