stale nfs file handle with exported loopback mounts

DISCUSSION [email protected] 2 participants 2 messages Oct 31, 2007 – Nov 1, 2007

Subsystems (2)

NFS client NFS server

lore

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lore

[email protected]

author

2007-10-31 22:50 UTC #0 lore raw

ok, i just wanted to tell that this isn`t the right way to go imho.

some time ago i have tested exporting a parent dir containing several loopb= ack mounted iso images with some pre-1.1.0 nfs-utils version and it worked =
- so =EC wonder why it now seems to have issues as things should have gone = stable.....

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-----Urspr=FCngliche Nachricht-----
Von: "J. Bruce Fields" <[email protected]>
Gesendet: 31.10.07 23:39:46
An: [email protected]
CC: [email protected], Neil Brown <[email protected]>
Betreff: Re: [NFS] stale nfs file handle with exported loopback mounts

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=
Quoted 3 lines · On Wed, Oct 31, 2007 at 11:19:43PM +0100, [email protected] wrote:
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If you add an explicit export for each one, =
you mean, i should export each of those ~500 loopback mounted iso image=

s ?

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come on, thats not what admins or users want, isnt it ?
=
No, of course not; I was just suggesting it as a way to confirm that's where the problem is.
=
--b.
=
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=
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-----Urspr=FCngliche Nachricht-----
Von: "J. Bruce Fields" <[email protected]>
Gesendet: 31.10.07 21:58:00
An: [email protected]
CC: Neil Brown <[email protected]>, [email protected]
Betreff: Re: [NFS] stale nfs file handle with exported loopback mounts
=
=
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=
Quoted 4 lines · On Wed, Oct 31, 2007 at 09:46:13PM +0100, [email protected] wrote:
hi !
=
i tried latest grml build (lenny/sid) as server today (suse 9.3 as =

client).

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=
error still existing, but a little bit different:
=
if i cd to the loopback-mount dir`s on the client, i see the conten=

ts of the parent directory, i.e. i get a recursion.

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=
That suggests something funky in the way we're identifying those filesystems in the filehandle. If you add an explicit export for each one, each with its own "fsid=3Dxyz" option (with xyz whatever positive integer you'd like, as long as it's difficult for export), does the problem go away??
=
--b.
=
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=
regards
roland
=
=

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-----Urspr=FCngliche Nachricht-----
Von: [email protected]
Gesendet: 30.10.07 21:05:56
An: Neil Brown <[email protected]>
CC: [email protected]
Betreff: Re: [NFS] stale nfs file handle with exported loopback m=

ounts

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=
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I recommend replacing subtree_check with no_subtree_check, but =

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shouldn't make an important difference in this case.
=
ok, i leave it as is.
=
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This should work with nfs-utils 1.1.0 or later. With earlier r=

eleases

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you need to explicitly export the subordinate filesystems too. =
=
mhh - opensuse doesn`t have nfs-utils package, but it has nfs-cli=

ent-1.1.0-8 which looks like they repackaged nfs-utils 1.1.0

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=
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It is a little odd that the errors are inconsistent.
=
ok, but only a minor issue, if an issue at all, isn`t it ? =
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Can you find any log messages from mountd in syslog? What do t=

hey

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say?
=
yes, on the client i`m getting :
=
Jun  3 21:36:01 linux kernel: nfs_update_inode: inode number mism=

atch

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Jun  3 21:36:01 linux kernel: expected (0:11/0x2), got (0:11/0x13=

881)

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Jun  3 21:36:01 linux kernel: nfs_update_inode: inode number mism=

atch

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Jun  3 21:36:01 linux kernel: expected (0:11/0x2), got (0:11/0x13=

881)

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Jun  3 21:36:17 linux kernel: nfs_update_inode: inode number mism=

atch

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Jun  3 21:36:17 linux kernel: expected (0:11/0x2), got (0:11/0x13=

881)

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Jun  3 21:36:17 linux kernel: nfs_update_inode: inode number mism=

atch

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Jun  3 21:36:17 linux kernel: expected (0:11/0x2), got (0:11/0x13=

881)

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Jun  3 21:36:20 linux kernel: nfs_update_inode: inode number mism=

atch

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Jun  3 21:36:20 linux kernel: expected (0:11/0x2), got (0:11/0x13=

881)

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Jun  3 21:36:20 linux kernel: nfs_update_inode: inode number mism=

atch

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=
=
no error message on the server:
Oct 26 10:09:31 opensuse103 mountd[4293]: authenticated unmount r=

equest from 10.0.0.40:1014 for /mnt (/mnt)

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Oct 26 10:10:07 opensuse103 mountd[4293]: authenticated mount req=

uest from 10.0.0.40:612 for /mnt (/mnt)

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Oct 26 10:10:43 opensuse103 mountd[4293]: authenticated unmount r=

equest from 10.0.0.40:623 for /mnt (/mnt)

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Oct 26 10:10:52 opensuse103 mountd[4293]: authenticated mount req=

uest from 10.0.0.40:624 for /mnt (/mnt)

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=
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Also what does
cat /proc/fs/nfsd/exports
=

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on the server show.
=
opensuse103:~ # cat /proc/fs/nfsd/exports
# Version 1.1
# Path Client(Flags) # IPs
/mnt/iso1 *(ro,no_root_squash,sync,wdelay,crossmnt,uuid=3D2=

c49fef2:ba464293:9b2bf2b8:322ccbcb)

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/mnt/iso3 *(ro,no_root_squash,sync,wdelay,crossmnt,uuid=3D2=

7ae9c67:0b794b36:8b5e9e17:37b569eb)

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/mnt *(ro,no_root_squash,sync,wdelay,crossmnt,uuid=3D08164ee4:=

2db141eb:ac961701:49c74396)

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/mnt/iso2 *(ro,no_root_squash,sync,wdelay,crossmnt,uuid=3D2=

aad6ea5:a05d4441:b94c48e6:e5d9981e)

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Finally, a tcpdump:
=

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tcpdump -s 0 -w /tmp/tcpdump port 2049
=
while you run the experiment might help.
=
ah - this seems to give a hint, but i don`t have a clue why the s=

erver (10.0.0.30) is telling the client (10.0.0.40) a "RPC Version mismatch= ".

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I also tried --no-nfs-version 4 for rpc.mountd (setting in /etc/=

sysconfig/nfs), but this didn`t make a difference.

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=
here is the tcpdump output - i did =

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=
- mount
- ls / ls -la / cd to subdirs
=
10:15:06.480542 IP 10.0.0.40.0 > 10.0.0.30.2049: 0 null 10:15:06.480572 IP 10.0.0.30.2049 > 10.0.0.40.0: reply ERR 0: RPC=

Version mismatch (167772160-0)

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10:15:06.480765 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 2031114=

913 win 1460 <nop,nop,timestamp 686128 737918>

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10:15:06.480821 IP 10.0.0.40.2079804678 > 10.0.0.30.2049: 108 fsi=

nfo fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743963CD8= 1908

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10:15:06.480833 IP 10.0.0.30.2049 > 10.0.0.40.1022: . ack 108 win=

181 <nop,nop,timestamp 737918 686128>

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10:15:06.513365 IP 10.0.0.30.2049 > 10.0.0.40.2079804678: reply o=

k 84 fsinfo rtmax 65536 rtpref 65536 wtmax 65536 wtpref 65536 dtpref 4096

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10:15:06.514408 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 85 win =

1460 <nop,nop,timestamp 686160 737926>

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10:15:06.514902 IP 10.0.0.40.2096581894 > 10.0.0.30.2049: 108 get=

attr fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743963CD= 81908

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10:15:06.515256 IP 10.0.0.30.2049 > 10.0.0.40.2096581894: reply o=

k 116 getattr DIR 40755 ids 0/0 sz 4096

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10:15:06.553865 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 201 win=

1460 <nop,nop,timestamp 686201 737926>

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10:16:03.091784 IP 10.0.0.40.2113359110 > 10.0.0.30.2049: 108 get=

attr fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C74396472= 19C8C

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10:16:03.096046 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 317 win=

1460 <nop,nop,timestamp 743610 752071>

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10:16:03.097370 IP 10.0.0.40.2130136326 > 10.0.0.30.2049: 112 acc=

ess fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743960000= 001F 001f

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10:16:03.098156 IP 10.0.0.30.2049 > 10.0.0.40.2130136326: reply o=

k 124 access c 0003

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10:16:03.156812 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 441 win=

1460 <nop,nop,timestamp 743651 752072>

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10:16:08.967804 IP 10.0.0.40.2146913542 > 10.0.0.30.2049: 108 get=

attr fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C74396000= 00000

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10:16:08.974285 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 557 win=

1460 <nop,nop,timestamp 749477 753540>

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10:16:08.975739 IP 10.0.0.40.2163690758 > 10.0.0.30.2049: 132 rea=

ddirplus fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C7439= 600000000 512 bytes @ 0

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10:16:08.975985 IP 10.0.0.30.2049 > 10.0.0.40.2163690758: reply o=

k 1448 readdirplus

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10:16:08.976510 IP 10.0.0.30.2049 > 10.0.0.40.1684108288: reply U=

nknown rpc response code=3D2021855861 340

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10:16:08.982238 IP 10.0.0.40.1022 > 10.0.0.30.2049: . ack 2345 wi=

n 2184 <nop,nop,timestamp 749479 753541>

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10:16:08.984415 IP 10.0.0.40.2180467974 > 10.0.0.30.2049: 116 loo=

kup fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743960000= 0004 "iso3"

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10:16:08.984931 IP 10.0.0.30.2049 > 10.0.0.40.2180467974: reply o=

k 232 lookup fh Unknown/0100060027AE9C670B794B368B5E9E1737B569EB00000001000= 00002000041ED

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10:16:09.008819 IP 10.0.0.40.2197245190 > 10.0.0.30.2049: 104 get=

attr fh Unknown/0100060027AE9C670B794B368B5E9E1737B569EB0000000FDD22CC3C700= 2F0AC

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attr fh Unknown/01000702813801000000000008164EE42DB141EBAC96170149C74396E66= D0700

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10:16:09.037823 IP 10.0.0.40.2247576838 > 10.0.0.30.2049: 108 get=

attr fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C74396000= 00000

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10:16:09.040423 IP 10.0.0.40.2264354054 > 10.0.0.30.2049: 112 get=

attr fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C74396000= 0000F

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10:16:09.041590 IP 10.0.0.40.2281131270 > 10.0.0.30.2049: 116 loo=

kup fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743960000= 0004 "iso2"

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10:16:09.049633 IP 10.0.0.40.2297908486 > 10.0.0.30.2049: 104 get=

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10:16:09.063218 IP 10.0.0.40.2314685702 > 10.0.0.30.2049: 128 get=

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10:16:09.189234 IP 10.0.0.40.2381794566 > 10.0.0.30.2049: 116 loo=

kup fh Unknown/01000700813801000000000008164EE42DB141EBAC96170149C743960000= 0004 "iso1"

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=
=
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does somebody have such setup up and running and can tell his=

distro / kernel and nfs-utils version ?

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maybe i change distro then.
=
I doubt that it is a distro-specific thing. As long as you have nfs-utils-1.1.0 it should work. I don't have a 10.3 box set up yet, but it works fine on Debian/unstable for me.
=
ok, will try this on debian.
=
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Maybe try adding the "no_root_squash" export option.
no difference
=
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What does "ls -l /export" on the server show?
nothing unusual. no errors, just the dirs/mountpoints =
Thanks for your help!
=
regards
roland
=
=
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=
Quoted 5 lines · On Saturday October 27, [email protected] wrote:
Hello !
=
with 2.6.22 i`m trying to export loopback mounted iso-images. =

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this is /etc/exports:
=
/export *(ro,crossmnt,subtree_check)
=
I recommend replacing subtree_check with no_subtree_check, but =

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shouldn't make an important difference in this case. =
=
This should work with nfs-utils 1.1.0 or later. With earlier r=

eleases

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you need to explicitly export the subordinate filesystems too. =
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=
in /export, i have loopback mounted iso-images
=
after mounting on the client side under /mnt (tried one older=

and one recent system) , i`m getting:

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=
vmhost:/mnt # ls -la
/bin/ls: iso1: Input/output error
/bin/ls: iso2 Input/output error
/bin/ls: iso3: Input/output error
total 10128
drwxrwxrwt 18 root root 270336 Oct 26 08:45 .
drwxrwxrwt  186 root root   20760 Oct 27 17:45 ..
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso1
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso2
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso3
=
vmhost:/mnt/iso1 # ls
/bin/ls: .: Stale NFS file handle
vmhost:/mnt/iso1 # ls -la
/bin/ls: .: Input/output error

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=
It is a little odd that the errors are inconsistent. =
Can you find any log messages from mountd in syslog? What do t=

hey

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say?
Also what does
cat /proc/fs/nfsd/exports
=
on the server show.
=
Finally, a tcpdump:
=
tcpdump -s 0 -w /tmp/tcpdump port 2049
=

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while you run the experiment might help.
=
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im unsure if i should blame suse here (its an opensuse 10.3=

box which seems to have nfs-utils 1.1.0)

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=
does somebody have such setup up and running and can tell his=

distro / kernel and nfs-utils version ?

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maybe i change distro then.
=
I doubt that it is a distro-specific thing. As long as you have nfs-utils-1.1.0 it should work. I don't have a 10.3 box set up yet, but it works fine on Debian/unstable for me. =
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Maybe try adding the "no_root_squash" export option. What does "ls -l /export" on the server show? =
NeilBrown
=
=

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=
=
=
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Neil Brown

2007-11-01 04:26 UTC #1 lore raw

Quoted 6 lines · On Wednesday October 31, [email protected] wrote:

ok, i just wanted to tell that this isn`t the right way to go imho.
some time ago i have tested exporting a parent dir containing several loopback mounted iso images with some pre-1.1.0 nfs-utils version and it worked - so � wonder why it now seems to have issues as things should have gone stable.....

We have a way of breaking things sometimes.... It's called "progress". :-)

The short answer is that there is a bug in mountd which is fixed by this patch:

utils/mountd/cache.c +1 -1

index ce1a5a9..fd317cd 100644
@@ -508,7 +508,7 @@ void nfsd_fh(FILE *f)
 	 */
 	qword_printint(f, 0x7fffffff);
 	if (found)
-		qword_print(f, found->e_path);
+		qword_print(f, found_path);
 	qword_eol(f);
  out:
 	free(found_path);

The longer answer is that there is also a bug in "mount.nfs" which is unrelated but was slowing me down in chasing this bug, and there is also a bug in the NFS client which was causing my client oops and need a reboot every time I triggered this bug in mountd, which further slowed me down.

The effect of this bug in mountd is that when the NFS client calls GETATTR on the root of the subordinate filesystem (e.g. your loop-mounted isos), it got attr information about the parent. ie. the top-level exported filesystem (/export in your case I think). This has a different 'fsid' than the nfs client was expecting and the NFS client got confused in various ways.

Thanks for your problem report - it helped find 3 bugs!

I'll get proper patches or bug report off to the relevant maintainers shortly.

NeilBrown

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