Bug 8966

Summary: NFSv3 server error in LOOKUP after READDIRPLUS Call
Product: File System Reporter: Peter Kovář (peter.kovar)
Component: NFSAssignee: Trond Myklebust (trondmy)
Status: CLOSED PATCH_ALREADY_AVAILABLE    
Severity: normal CC: bfields, neilb
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.23-rc? Subsystem:
Regression: Yes Bisected commit-id:
Attachments: Patch to fix crossmnt problem

Description Peter Kovář 2007-09-02 10:55:01 UTC 
Most recent kernel where this bug did not occur: 2.6.22.6
Distribution: Fedora release 7.91 (Rawhide)
Hardware Environment: Intel Core 2 Quad
Problem Description: ls NFS automounted directory through UDP or TCP returns NFS3ERR_NOENT error in LOOKUP reply for directories such as /dev /net /proc 

Steps to reproduce:

€ ls -l /net/Quad
total 432
?---------    ? ?           ?        ?            ? /net/Quad/boot
?---------    ? ?           ?        ?            ? /net/Quad/dev
?---------    ? ?           ?        ?            ? /net/Quad/misc
?---------    ? ?           ?        ?            ? /net/Quad/net
?---------    ? ?           ?        ?            ? /net/Quad/proc
?---------    ? ?           ?        ?            ? /net/Quad/sys
drwxr-xr-x    2 root        root  4096 Aug 31 17:18 bin
drwxr-xr-x  129 root        root 12288 Sep  2 18:09 etc
drwxr-xr-x    7 root        root  4096 Aug 21 23:30 home

It the same in whole 2.6.23-rc? series as well as latest Fedora kernel with identical configuration. 2.6.22.6 is OK.

€ uname -a
Linux Quad 2.6.23-rc1 #1 SMP PREEMPT Sun Sep 2 17:40:25 CEST 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux Quad 2.6.23-rc2 #1 SMP PREEMPT Sun Sep 2 14:57:57 CEST 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux Quad 2.6.23-rc3 #1 SMP PREEMPT Sun Sep 2 15:01:02 CEST 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux Quad 2.6.23-rc4 #1 SMP PREEMPT Sun Sep 2 14:59:25 CEST 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux Quad 2.6.23-rc5 #1 SMP PREEMPT Sat Sep 1 12:52:16 CEST 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux Quad 2.6.23-0.149.rc4.fc8 #1 SMP Wed Aug 29 07:37:52 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

gcc-4.1.2-19
binutils-2.17.50.0.18-1
Comment 1 Neil Brown 2007-09-03 22:24:02 UTC 
Is it correct that all the 'problem' directories are mounted-on on the server,
while the directories that 'stat' ok are not mounted on?

What export options are you using on the server?

While filesystem is being used for the root on the server?
Comment 2 Neil Brown 2007-09-03 22:56:44 UTC 
Created attachment 12689 [details]
Patch to fix crossmnt problem

Don't bother with those details - I think I've figured it out.

can you please try the attached patch and confirm that it works?

Thanks,
NeilBrown
Comment 3 Peter Kovář 2007-09-04 03:13:41 UTC 
Hi++ Neil,

your patch fixed the problem with Nightmare File System server.

Thank you very much.

Peter Kovář
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