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From:   Olga Kornievskaia <aglo@umich.edu>
Date:   Fri, 21 May 2021 18:38:32 -0400
Message-ID: <CAN-5tyExni7BcNkf0VxYdfFcydBhys3T8Y06PCHE81dZiPLg6w@mail.gmail.com>
Subject: Re: NFSv4: Mounting NFS server which is down, blocks all other NFS
 mounts on same machine
To:     Michael Wakabayashi <mwakabayashi@vmware.com>
Cc:     Steve Dickson <SteveD@redhat.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
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On Fri, May 21, 2021 at 5:06 PM Olga Kornievskaia <aglo@umich.edu> wrote:
>
> Hi Michael,
>
> On Fri, May 21, 2021 at 4:31 PM Michael Wakabayashi
> <mwakabayashi@vmware.com> wrote:
> >
> > Hi Olga,
> >
> > > But I would like to know  what's a legitimate reason for a machine to
> > > have a listening but not responsive port 2049
> >
> > The NFS server in this case was decommissioned and taken offline.
>
> You say that it's taken offline. If it's offline there shouldn't be
> anything listening on port 2049. I was only able to reproduce the
> problem when a client is able to send a SYN to the server and not
> getting a reply back. If the server is offline, there will always be a
> reply back (RST or something of the sorts). Client tries a bit but it
> never gets stuck in the rpc_execute() state because it would get a
> reply from the TCP layer. Your stack is where  there is no TCP reply
> from the server.
>

More on my explanation. I'm attaching 2 sets of tracepoints. 1 case is
"unreachable" (there is no machine with such IP 192.168.1.108 in my
case -- this is your example of somebody providing a bad name or
address. It will not prevent any other mounts from proceeding) and 2nd
case is "unresponsible" (192.168.1.68, something is listening on 2049
but not responding... it produced the stack trace you have provided.
It also demonstrates that mounts will succeed but only after things
timeout.

In the "unreachable" case, TCP is able to figure out its unreachable
pretty fast and timeout. The line to look for in the "unreachable.log"
file:
          <...>-67711   [001] .... 341123.253898: rpc_stats_latency:
task:12763@3 xid=3D0xb8a00f1d nfsv4 NULL backlog=3D0 rtt=3D0 execute=3D3082=
006

In case of the un-responsible server, TCP takes a lot longer to timeout:
           <...>-67806   [001] .... 341558.088633: rpc_stats_latency:
task:12814@1 xid=3D0x0f8fd007 nfsv4 NULL backlog=3D0 rtt=3D0
execute=3D181069428


There is a better way of using tracepoint but the quick (my preferred
way) way I turn on trace points is (as root) and then examining them:
cd /sys/kernel/debug/tracing
echo 1 > events/sunrpc/enable
echo 1 > events/nfs4/enable
cat trace_pipe > /tmp/trace_pipe.output

ctrl-c after test is done. Examine the output file.

I suggest that you get tracepoints from your system and see if it
behaves more like the "unresponsive" case than "unreachable" case by
comparing to the tracepoints I provided. The "unreachable" case: TCP
layer is failing us with -113 which is "host unreachable" so we give
up and go back to the NFS layer. The "unresponsive" case: TCP layer is
failing with -107 "not connected" so the RPC layer will retry several
times.

> > The user's automated tests was not updated and still trying to
> > mount this offline NFS server.
> >
> > We refer to this decommissioned server as being unreachable.
> > Maybe it's a difference in terminology, but for us if the IP address do=
es not
> > respond to ping (as in this case), we refer to it as being  unreachable=
.
> > Other tools use this same terminology. For example "fping":
> > $ fping 2.2.2.2
> > 2.2.2.2 is unreachable
> >
> > We can't really prevent users from making mistakes.
> > * Users will continue to accidentally mount decommissioned servers.
> > * Users will continue to mount the wrong IP addresses in their tests an=
d elsewhere.
> > And when these situation occur, it will block valid NFS mounts.
> >
> > Should I be prevented from mounting NFS shares because
> > someone else mistyped the NFS server name in their mount command?
> >
> > From a user perspective, it's not clear why a mount of a
> > decommissioned(and therefore down) NFS server is blocking
> > mounts of every other valid NFS server?
> > Shouldn't these valid NFS servers be allowed to mount?
> >
> > Thanks, Mike
> >
> >
> >
> >
> >
> > From: Olga Kornievskaia <aglo@umich.edu>
> > Sent: Friday, May 21, 2021 12:35 PM
> > To: Michael Wakabayashi <mwakabayashi@vmware.com>
> > Cc: Steve Dickson <SteveD@redhat.com>; linux-nfs@vger.kernel.org <linux=
-nfs@vger.kernel.org>
> > Subject: Re: NFSv4: Mounting NFS server which is down, blocks all other=
 NFS mounts on same machine
> >
> > On Fri, May 21, 2021 at 3:09 PM Michael Wakabayashi
> > <mwakabayashi@vmware.com> wrote:
> > >
> > > > This code came in with commit c156618e15101 which fixed a deadlock =
in nfs client initialization.
> > >
> > > > My conclusion is: an unresponsive server will block other mounts bu=
t only until timeout is reached.
> > >
> > > Hi Steve and Olga,
> > >
> > > We run multiple Kubernetes clusters.
> > > These clusters are composed of hundreds of Kubernetes nodes.
> > > Any of these nodes can NFS mount on behalf of the containers running =
on these nodes.
> > > We've seen several times in the past few months an NFS mount hang, an=
d then several hundred up to several thousand NFS mounts blocked by this hu=
ng NFS mount processes (we have many "testing" workloads that access NFS).
> > > Having several hundred NFS mounts blocked on a node causes the Kubern=
etes node to become unstable and severely degrades service.
> > >
> > > We did not expect a hung NFS mount to block every other NFS mount, es=
pecially when the other mounts are unrelated and otherwise working properly=
.
> > >
> > > Can this behavior be changed?
> >
> > Hi Michael,
> >
> > I'm not sure if the design can be changed. But I would like to know
> > what's a legitimate reason for a machine to have a listening but not
> > responsive port 2049 (I'm sorry I don't particularly care for the
> > explanation of "because this is how things currently work in
> > containers, Kubernetes"). Seems like the problem should be fixed
> > there. There is no issue if a mount goes to an IP that has nothing
> > listening on port 2049.
> >
> > Again I have no comments on the design change: or rather my comment
> > was I don't see a way. If you have 2 parallel clients initializing and
> > the goal is to have at most one client if both are the same, then I
> > don't see a way besides serializing it as it's done now.
> >
> > >
> > > Thanks, Mike
> > >
> > >
> > > ________________________________
> > > From: Steve Dickson <SteveD@RedHat.com>
> > > Sent: Thursday, May 20, 2021 11:42 AM
> > > To: Olga Kornievskaia <aglo@umich.edu>; Michael Wakabayashi <mwakabay=
ashi@vmware.com>
> > > Cc: linux-nfs@vger.kernel.org <linux-nfs@vger.kernel.org>
> > > Subject: Re: NFSv4: Mounting NFS server which is down, blocks all oth=
er NFS mounts on same machine
> > >
> > > Hey.
> > >
> > > On 5/19/21 3:15 PM, Olga Kornievskaia wrote:
> > > > On Sun, May 16, 2021 at 11:18 PM Michael Wakabayashi
> > > > <mwakabayashi@vmware.com> wrote:
> > > >>
> > > >> Hi,
> > > >>
> > > >> We're seeing what looks like an NFSv4 issue.
> > > >>
> > > >> Mounting an NFS server that is down (ping to this NFS server's IP =
address does not respond) will block _all_ other NFS mount attempts even if=
 the NFS servers are available and working properly (these subsequent mount=
s hang).
> > > >>
> > > >> If I kill the NFS mount process that's trying to mount the dead NF=
S server, the NFS mounts that were blocked will immediately unblock and mou=
nt successfully, which suggests the first mount command is blocking the oth=
er mount commands.
> > > >>
> > > >>
> > > >> I verified this behavior using a newly built mount.nfs command fro=
m the recent nfs-utils 2.5.3 package installed on a recent version of Ubunt=
u Cloud Image 21.04:
> > > >> * https://nam04.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fsourceforge.net%2Fprojects%2Fnfs%2Ffiles%2Fnfs-utils%2F2.5.3%2F&amp;dat=
a=3D04%7C01%7Cmwakabayashi%40vmware.com%7C254806799e3f45388def08d91c8f9c45%=
7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637572225410414697%7CUnknown%7=
CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn=
0%3D%7C1000&amp;sdata=3DqWsYLeSLC0k89%2FHJGqhMlBnEvGR%2Bdqxve4n56bww%2Bnk%3=
D&amp;reserved=3D0
> > > >> * https://nam04.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fcloud-images.ubuntu.com%2Freleases%2Fhirsute%2Frelease-20210513%2Fubunt=
u-21.04-server-cloudimg-amd64.ova&amp;data=3D04%7C01%7Cmwakabayashi%40vmwar=
e.com%7C254806799e3f45388def08d91c8f9c45%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0=
%7C0%7C0%7C637572225410414697%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL=
CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D5sHt34ZBts=
a7MjRP0RbymhbjOn%2FT5X5JUWvIQV93PUU%3D&amp;reserved=3D0
> > > >>
> > > >>
> > > >> The reason this looks like it is specific to NFSv4 is from the fol=
lowing output showing "vers=3D4.2":
> > > >>> $ strace /sbin/mount.nfs <unreachable-IP-address>:/path /tmp/mnt
> > > >>> [ ... cut ... ]
> > > >>> mount("<unreadhable-IP-address>:/path", "/tmp/mnt", "nfs", 0, "ve=
rs=3D4.2,addr=3D<unreachable-IP-address>,clien"...^C^Z
> > > >>
> > > >> Also, if I try the same mount.nfs commands but specifying NFSv3, t=
he mount to the dead NFS server hangs, but the mounts to the operational NF=
S servers do not block and mount successfully; this bug doesn't happen when=
 using NFSv3.
> > > >>
> > > >>
> > > >> We reported this issue under util-linux here:
> > > >> https://nam04.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fgithub.com%2Fkarelzak%2Futil-linux%2Fissues%2F1309&amp;data=3D04%7C01%7Cm=
wakabayashi%40vmware.com%7C254806799e3f45388def08d91c8f9c45%7Cb39138ca3cee4=
b4aa4d6cd83d9dd62f0%7C0%7C0%7C637572225410414697%7CUnknown%7CTWFpbGZsb3d8ey=
JWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp=
;sdata=3DUrD%2FaBX2S4Qq7CrgltIc9lEzA8oEQQn0srMXtrq%2B6CE%3D&amp;reserved=3D=
0
> > > >> [mounting nfs server which is down blocks all other nfs mounts on =
same machine #1309]
> > > >>
> > > >> I also found an older bug on this mailing list that had similar sy=
mptoms (but could not tell if it was the same problem or not):
> > > >> https://nam04.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fpatchwork.kernel.org%2Fproject%2Flinux-nfs%2Fpatch%2F87vaori26c.fsf%40not=
abene.neil.brown.name%2F&amp;data=3D04%7C01%7Cmwakabayashi%40vmware.com%7C2=
54806799e3f45388def08d91c8f9c45%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%=
7C637572225410414697%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2=
luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DlBAE9wZbykGQ8VPH6Ys=
AtuaIpMpDcAtqsxVNDV%2BaNTk%3D&amp;reserved=3D0
> > > >> [[PATCH/RFC] NFSv4: don't let hanging mounts block other mounts]
> > > >>
> > > >> Thanks, Mike
> > > >
> > > > Hi Mike,
> > > >
> > > > This is not a helpful reply but I was curious if I could reproduce
> > > > your issue but was not successful. I'm able to initiate a mount to =
an
> > > > unreachable-IP-address which hangs and then do another mount to an
> > > > existing server without issues. Ubuntu 21.04 seems to be 5.11 based=
 so
> > > > I tried upstream 5.11 and I tried the latest upstream nfs-utils
> > > > (instead of what my distro has which was an older version).
> > > >
> > > > To debug, perhaps get an output of the nfs4 and sunrpc tracepoints.
> > > > Or also get output from dmesg after doing =E2=80=9Cecho t >
> > > > /proc/sysrq-trigger=E2=80=9D to see where the mounts are hanging.
> > > >
> > > It looks like Mike is correct... The first process (mount 1.1.1.1:/mn=
t) is
> > > hung in trying the connection:
> > >
> > > PID: 3394   TASK: ffff9da8c42734c0  CPU: 0   COMMAND: "mount.nfs"
> > >  #0 [ffffb44780f638c8] __schedule at ffffffff82d7959d
> > >  #1 [ffffb44780f63950] schedule at ffffffff82d79f2b
> > >  #2 [ffffb44780f63968] rpc_wait_bit_killable at ffffffffc05265ce [sun=
rpc]
> > >  #3 [ffffb44780f63980] __wait_on_bit at ffffffff82d7a4ba
> > >  #4 [ffffb44780f639b8] out_of_line_wait_on_bit at ffffffff82d7a5a6
> > >  #5 [ffffb44780f63a00] __rpc_execute at ffffffffc052fc8a [sunrpc]
> > >  #6 [ffffb44780f63a48] rpc_execute at ffffffffc05305a2 [sunrpc]
> > >  #7 [ffffb44780f63a68] rpc_run_task at ffffffffc05164e4 [sunrpc]
> > >  #8 [ffffb44780f63aa8] rpc_call_sync at ffffffffc0516573 [sunrpc]
> > >  #9 [ffffb44780f63b00] rpc_create_xprt at ffffffffc051672e [sunrpc]
> > > #10 [ffffb44780f63b40] rpc_create at ffffffffc0516881 [sunrpc]
> > > #11 [ffffb44780f63be8] nfs_create_rpc_client at ffffffffc0972319 [nfs=
]
> > > #12 [ffffb44780f63c80] nfs4_init_client at ffffffffc0a17882 [nfsv4]
> > > #13 [ffffb44780f63d70] nfs4_set_client at ffffffffc0a16ef8 [nfsv4]
> > > #14 [ffffb44780f63de8] nfs4_create_server at ffffffffc0a188d8 [nfsv4]
> > > #15 [ffffb44780f63e60] nfs4_try_get_tree at ffffffffc0a0bf69 [nfsv4]
> > > #16 [ffffb44780f63e80] vfs_get_tree at ffffffff823b6068
> > > #17 [ffffb44780f63ea0] path_mount at ffffffff823e3d8f
> > > #18 [ffffb44780f63ef8] __x64_sys_mount at ffffffff823e45a3
> > > #19 [ffffb44780f63f38] do_syscall_64 at ffffffff82d6aa50
> > > #20 [ffffb44780f63f50] entry_SYSCALL_64_after_hwframe at ffffffff82e0=
007c
> > >
> > > The second mount is hung up in nfs_match_client()/nfs_wait_client_ini=
t_complete
> > > waiting for the first process to compile
> > > nfs_match_client:
> > >
> > >        /* If a client is still initializing then we need to wait */
> > >         if (clp->cl_cons_state > NFS_CS_READY) {
> > >             refcount_inc(&clp->cl_count);
> > >             spin_unlock(&nn->nfs_client_lock);
> > >             error =3D nfs_wait_client_init_complete(clp);
> > >             nfs_put_client(clp);
> > >             spin_lock(&nn->nfs_client_lock);
> > >             if (error < 0)
> > >                 return ERR_PTR(error);
> > >             goto again;
> > >         }
> > >
> > > This code came in with commit c156618e15101 which fixed
> > > a deadlock in nfs client initialization.
> > >
> > > steved.
> > >

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