Bug 379451

Summary: Cifs unmount on shutdown takes more than a minute
Product: [Fedora] Fedora Reporter: Patrick Steiner <patrick>
Component: kernelAssignee: Jeff Layton <jlayton>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 8CC: steved
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2007-11-28 14:02:39 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Patrick Steiner 2007-11-13 07:02:32 UTC 
Description of problem:

If i shutdown my pc the cifs unmount takes very long. and if i take a look at
the dmesg log file i get the following error:

eth0: no IPv6 routers present
 CIFS VFS: RFC1001 size 35 bigger than SMB for Mid=10124
Bad SMB: : dump of 48 bytes of data at 0xe7998a00
 00000023 424d53ff 00000074 00018800 # . . . � S M B t . . . . . . .
 00000000 00000000 00000000 69230000 . . . . . . . . . . . . . . # i
 278c0000 0000ff00 12a50640 b400020a . . . ' . � . . @ . � . . . . �
Comment 1 Simo Sorce 2007-11-23 20:51:14 UTC 
This seem to be a cifs.ko issue, re-assigning to Jeff.
Comment 2 Jeff Layton 2007-11-28 13:25:36 UTC 
What sort of server is this?
Comment 3 Patrick Steiner 2007-11-28 13:42:21 UTC 
the clients are:

redhat es 3 incl. latest updates
redhat es 4 incl. latest updates
fedora 8 incl. latest updates

the server is a netapp fas2050

here is the mount entry from fstab:
//foo/INSTALL     /mnt/net/foo/install      cifs  
auto,credentials=/root/.smbcredentials,uid=500,gid=500                    1       1

mount outputs:

//foo/INSTALL on /mnt/net/foo/install type cifs (rw,mand)
Comment 4 Jeff Layton 2007-11-28 14:02:39 UTC 
I suspect that this is a duplicate of:

https://bugzilla.redhat.com/show_bug.cgi?id=191112

...you might want to try looking at captures with wireshark and see if the
server is sending a bogus BCC value in the LogoffANDX response. I'm going to
close this as a duplicate of that bug and suggest opening a case with netapp.
They may already have a filer patch that fixes this (I'm not sure).

Note that a patch recently went upstream to fix a potential buffer overflow in
CIFS. That patch has the side effect of making the client not expect a response
from the server for Logoff requests. That may also work around this problem, but
it's not in Fedora yet.


*** This bug has been marked as a duplicate of 191112 ***