On Mon, Aug 07, 2017 at 02:20:06PM +0200, Michal Privoznik wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=1467245
> 
> Currently, there's a bug when undefining a domain with NVRAM
> store. Basically, the unlink() of the NVRAM store file happens
> during the undefine procedure iff domain is inactive. So, if
> domain is running and undefine is called the file is left behind.
> It won't be removed in the domain cleanup process either
> (qemuProcessStop). One of the solutions is to remove if
> regardless of the domain state and rely on qemu having the file
> opened. This still has a downside that if the domain is defined
> back the NVRAM store file is going to be new, any changes to the
> current one are lost (just like with any other file that is
> deleted while a process has it opened). But is it really a
> downside?

We only unlink if the user explicitly gives VIR_DOMAIN_UNDEFINE_NVRAM,
so I think that "prolem" scenario you describe is exactly what the user
has asked for. ie not a bug - just don't pass VIR_DOMAIN_UNDEFINE_NVRAM
if they want to keep it around across an undefine+define pair.

> 
> Signed-off-by: Michal Privoznik <mpriv...@redhat.com>
> ---
>  src/qemu/qemu_driver.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 574c351ae..992ae2a2e 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -7367,8 +7367,8 @@ qemuDomainUndefineFlags(virDomainPtr dom,
>          }
>      }
>  
> -    if (!virDomainObjIsActive(vm) &&
> -        vm->def->os.loader && vm->def->os.loader->nvram &&
> +    if (vm->def->os.loader &&
> +        vm->def->os.loader->nvram &&
>          virFileExists(vm->def->os.loader->nvram)) {
>          if ((flags & VIR_DOMAIN_UNDEFINE_NVRAM)) {
>              if (unlink(vm->def->os.loader->nvram) < 0) {

ACK

Regards,
Daniel
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