Re: [Xen-devel] [PATCH v4 04/12] xenstore: add per-node generation counter

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.01.17 at 17:02, <JGross@xxxxxxxx> wrote:
> On 09/01/17 15:38, Jan Beulich wrote:
>>>>> On 05.12.16 at 08:48, <JGross@xxxxxxxx> wrote:
>>> --- a/tools/xenstore/include/xenstore_lib.h
>>> +++ b/tools/xenstore/include/xenstore_lib.h
>>> @@ -44,6 +44,7 @@ struct xs_permissions
>>>  
>>>  /* Header of the node record in tdb. */
>>>  struct xs_tdb_record_hdr {
>>> +   uint64_t generation;
>>>     uint32_t num_perms;
>>>     uint32_t datalen;
>>>     uint32_t childlen;
>> 
>> After quite a bit of debugging I think I now understand that this is
>> the reason for a startup SEGV I'm getting from 4.8 xenstored after
>> that same system has run unstable xenstored. The above
> 
> How are you starting xenstored? I can't see how xenstored started
> by Xen's scripts will see a file with a tdb dump. Those should be
> deleted by the start scripts of Xen.

I order to be able to use multiple Xen versions on a single system,
I can't use the start scripts. Instead I launch xenstored from a
script of mine (wrapping all the various xen-specific commands)
upon first use after boot. Of course I could add deletion of that
file to the script, but then again all has worked fine for years, so
I'm a little reluctant to do so (after all I'd expect/hope there's a
reason for this file to exist in the first place).

Jan


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