[OpenAFS] "stillborn client" in src/viced/host.c
Jeffrey Altman
jaltman@secure-endpoints.com
Tue, 17 Oct 2006 17:29:27 -0400
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It means that the file server received two requests from the same
client at about the same time and two different threads are processing
the two requests and each one creates a 'client' object. However,
only one of the 'client' objects is allowed to exist for a given
client. Therefore, one of them is discarded as "stillborn".
This has nothing to do with mixing Transarc and OpenAFS.
Jeffrey Altman
Bill Stivers wrote:
> Hey all:
>
> Thanks much for the tremendous help you've provided to me and my cohorts.
>
> I have another lame question. I've been speaking to Joe about error
> information he's seeing on our AFS servers, and he noted one
> particularly odd one:
>
> Tue Oct 17 13:15:59 2006 FindClient: stillborn client b3f528(b17753cc);
> conn b5b348 (host 128.114.104.230:7001) had client b4c030(b17753cc)
> Mon Oct 16 19:27:28 2006 FindClient: stillborn client b3f7c8(2b1cc290);
> conn b450d0 (host 128.114.30.230:7001) had client 6d52f0(2b1cc290)
>
> I looked at the code, and found the lines that are generating the
> message in src/viced/host.c, which are as follows:
>
> /* Now, tcon may already be set to a rock, since we blocked with no
> host
> * or client locks set above in pr_GetCPS (XXXX some locking is
> probably
> * required). So, before setting the RPC's rock, we should disconnect
> * the RPC from the other client structure's rock.
> */
> oldClient = (struct client *)rx_GetSpecific(tcon, rxcon_client_key);
> if (oldClient && oldClient->tcon == tcon) {
> char hoststr[16];
> if (!oldClient->deleted) {
> /* if we didn't create it, it's not ours to put back */
> if (created) {
> ViceLog(0, ("FindClient: stillborn client %x(%x); conn
> %x (host %s:%d) had cl
> ient %x(%x)\n",
> client, client->sid, tcon,
> afs_inet_ntoa_r(rxr_HostOf(tcon), hoststr),
> ntohs(rxr_PortOf(tcon)),
> oldClient, oldClient->sid));
> if ((client->ViceId != ANONYMOUSID) &&
> client->CPS.prlist_val)
> free(client->CPS.prlist_val);
> client->CPS.prlist_val = NULL;
> client->CPS.prlist_len = 0;
> if (client->tcon) {
> rx_SetSpecific(client->tcon, rxcon_client_key, (void
> *)0);
> }
> }
>
>
> Can someone who knows the codebase well shed some light as to what's
> going on? Is this another one of those: "You have OpenAFS in part of
> your infrastructure and TransARC in part of it" issues? is this,
> perhaps, part of the locking code?
>
> I'm trying to do due diligence to make sure my clients aren't partially
> to blame for some of the things that our server administrators are
> fixing now, and this is part of that effort.
>
> Any information/advice would be appreciated.
>
> ---
> Bill Stivers
> IC Unix Lab and Systems Administrator
> University of California at Santa Cruz
> stiversb@ucsc.edu
> v) 831-459-2472
> f) 831-459-2914
>
>
>
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info
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