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Message-ID: <BANLkTimvMeF94O_S0rpSgy=5Z4obU9pPfg@mail.gmail.com> Date: Wed, 22 Jun 2011 16:01:01 -0700 From: Joshua Scoggins <theoretically.x64@...il.com> To: Trond Myklebust <Trond.Myklebust@...app.com> Cc: linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org Subject: Re: Issue with Race Condition on NFS4 with KRB I just manually applied the patch as I'm using the gentoo sources. Josh On Wed, Jun 22, 2011 at 3:53 PM, Trond Myklebust <Trond.Myklebust@...app.com> wrote: > On Wed, 2011-06-22 at 15:40 -0700, Joshua Scoggins wrote: >> The patch isn't applying to the 2.6.39 kernel sources. > > It does for me: > > [trondmy@...e linux-2.6]$ git checkout v2.6.39 > HEAD is now at 61c4f2c... Linux 2.6.39 > [trondmy@...e linux-2.6]$ git am ~/Desktop/bugfixes/0001-SUNRPC-Fix-a-potential-race-in-between-xprt_complete.patch > Applying: SUNRPC: Fix a potential race in between xprt_complete_rqst and xprt_transmit > [trondmy@...e linux-2.6]$ > > Are you perhaps using some distro kernel instead of the regular one from > Linus' repository? > > Cheers > Trond > >> -Josh >> >> On Wed, Jun 22, 2011 at 2:51 PM, Trond Myklebust >> <Trond.Myklebust@...app.com> wrote: >> > On Wed, 2011-06-22 at 12:18 -0700, Joshua Scoggins wrote: >> >> According to the it guys they are running solaris 10 as the server platform. >> > >> > Ok. That should not be subject to the race I was thinking of... >> > >> >> On Wed, Jun 22, 2011 at 11:57 AM, Trond Myklebust >> >> <Trond.Myklebust@...app.com> wrote: >> >> > On Wed, 2011-06-22 at 11:37 -0700, Joshua Scoggins wrote: >> >> >> Here are our mount options from auto.master >> >> >> >> >> >> /user -fstype=nfs4,sec=krb5p,noresvport,noatime >> >> >> /group -fstype=nfs4,sec=krb5p,noresvport,noatime >> >> >> >> >> >> As for the server, we don't control it. It's actually run by the >> >> >> campus wide it department we are just lab support for CS. I can >> >> >> potentially get the server information but I need to know what you want >> >> >> specifically as they're pretty paranoid about giving out information about >> >> >> their servers. >> >> > >> >> > I would just want to know _what_ server platform you are running >> >> > against. I know of at least one server bug that might explain what you >> >> > are seeing, and I'd like to eliminate that as a possibility. >> >> > >> >> > Trond >> >> > >> >> >> Joshua Scoggins >> >> >> >> >> >> On Wed, Jun 22, 2011 at 11:30 AM, Trond Myklebust >> >> >> <Trond.Myklebust@...app.com> wrote: >> >> >> > On Wed, 2011-06-22 at 11:21 -0700, Joshua Scoggins wrote: >> >> >> >> Hello, >> >> >> >> >> >> >> >> We are trying to update our linux images in our CS lab and have it a >> >> >> >> bit of an issue. We are >> >> >> >> using nfs to load user home folder. While testing the new image we >> >> >> >> found that the nfs4 module will >> >> >> >> crash when using firefox 3.6.17 for an extended period of time. Some >> >> >> >> research via google yielded that >> >> >> >> it's a potential race condition specific to nfs with krb auth with >> >> >> >> newer kernels. Our old image doesn't have >> >> >> >> this issue and it seems that its due to it running a far older kernel version. >> >> >> >> >> >> >> >> We have two images and both are having this problem. One is running >> >> >> >> 2.6.39 and the other is 2.6.38. >> >> >> >> Here is what dmesg spit out from the machine running 2.6.39 on one occasion: >> >> >> >> >> >> >> >> [ 678.632061] ------------[ cut here ]------------ >> >> >> >> [ 678.632068] WARNING: at net/sunrpc/clnt.c:1567 call_decode+0xb2/0x69c() >> >> >> >> [ 678.632070] Hardware name: OptiPlex 755 >> >> >> >> [ 678.632072] Modules linked in: nvidia(P) scsi_wait_scan >> >> >> >> [ 678.632078] Pid: 3882, comm: kworker/0:2 Tainted: P >> >> >> >> 2.6.39-gentoo-r1 #1 >> >> >> >> [ 678.632080] Call Trace: >> >> >> >> [ 678.632086] [<ffffffff81035b20>] warn_slowpath_common+0x80/0x98 >> >> >> >> [ 678.632091] [<ffffffff8117231e>] ? nfs4_xdr_dec_readdir+0xba/0xba >> >> >> >> [ 678.632094] [<ffffffff81035b4d>] warn_slowpath_null+0x15/0x17 >> >> >> >> [ 678.632097] [<ffffffff81426f48>] call_decode+0xb2/0x69c >> >> >> >> [ 678.632101] [<ffffffff8142d2b5>] __rpc_execute+0x78/0x24b >> >> >> >> [ 678.632104] [<ffffffff8142d4c9>] ? rpc_execute+0x41/0x41 >> >> >> >> [ 678.632107] [<ffffffff8142d4d9>] rpc_async_schedule+0x10/0x12 >> >> >> >> [ 678.632111] [<ffffffff8104a49d>] process_one_work+0x1d9/0x2e7 >> >> >> >> [ 678.632114] [<ffffffff8104c402>] worker_thread+0x133/0x24f >> >> >> >> [ 678.632118] [<ffffffff8104c2cf>] ? manage_workers+0x18d/0x18d >> >> >> >> [ 678.632121] [<ffffffff8104f6a0>] kthread+0x7d/0x85 >> >> >> >> [ 678.632125] [<ffffffff8145e314>] kernel_thread_helper+0x4/0x10 >> >> >> >> [ 678.632128] [<ffffffff8104f623>] ? kthread_worker_fn+0x13a/0x13a >> >> >> >> [ 678.632131] [<ffffffff8145e310>] ? gs_change+0xb/0xb >> >> >> >> [ 678.632133] ---[ end trace 6bfae002a63e020e ]--- >> > >> > Looking at the code, there is only one way I can see for that warning to >> > occur, and that is if we put the request back on the 'xprt->recv' list >> > after it has already received a reply from the server. >> > >> > Can you reproduce the problem with the attached patch? >> > >> > Trond >> > >> > -- >> > Trond Myklebust >> > Linux NFS client maintainer >> > >> > NetApp >> > Trond.Myklebust@...app.com >> > www.netapp.com >> > >> > > > -- > Trond Myklebust > Linux NFS client maintainer > > NetApp > Trond.Myklebust@...app.com > www.netapp.com > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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