Re: [Qemu-devel] [libvirt] [PATCH] qemu: Fix shutdown regression

[Daniel P. Berrange]

On Tue, Sep 20, 2011 at 12:01:58PM -0600, Eric Blake wrote:
> On 09/20/2011 11:39 AM, Jiri Denemark wrote:
> >The commit that prevents disk corruption on domain shutdown
> >(96fc4784177ecb70357518fa863442455e45ad0e) causes regression with QEMU
> >0.14.* and 0.15.* because of a regression bug in QEMU that was fixed
> >only recently in QEMU git. With affected QEMU binaries, domains cannot
> >be shutdown properly and stay in a paused state. This patch tries to
> >avoid this by sending SIGKILL to 0.1[45].* QEMU processes. Though we
> >wait a bit more between sending SIGTERM and SIGKILL to reduce the
> >possibility of virtual disk corruption.
> >---
> >  src/qemu/qemu_capabilities.c |    7 +++++++
> >  src/qemu/qemu_capabilities.h |    1 +
> >  src/qemu/qemu_process.c      |   19 +++++++++++++------
> >  3 files changed, 21 insertions(+), 6 deletions(-)
> 
> ACK.  But it would be nice if upstream qemu could give us a more
> reliable indication of whether the qemu SIGTERM bug is fixed, so
> that we don't corrupt data on a patched 0.14 or 0.15 qemu.  That is,
> as part of fixing the bug in qemu, we should also update -help text
> or something similar, so that libvirt can avoid making decisions
> solely on version numbers.

-help is traditionally just a way to detecting features. I think it
would be rather an abuse of -help to start adding information about
every bugfix that affects mgmt apps too. So I think a version number
check is sufficient in this case.

Regards,
Daniel
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