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



Am 20.09.2011 20:01, schrieb Eric Blake:
> 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.

I really think libvirt should never SIGKILL qemu unless it's explicitly
told so. Management tools should try to ask the user before doing so.
Killing qemu with SIGKILL is never safe.

>> ---
>>   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. 

0.14 shouldn't have this bug, but it looks like 0.15 has it.

Justin, can you cherry-pick d9389b96 and 941f511a into stable-0.15 in
order to fix -no-shutdown?

Kevin


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