# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.4 LTS"

# uname -a
Linux icaro 2.6.32-41-generic #91-Ubuntu SMP Wed Jun 13 11:43:55 UTC 2012 x86_64 GNU/Linux

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(This error is the same in x86-32bits, and RedHat EL 5.2)
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When mounting a CIFS share from a NetApp (FAS3020 NetApp Release 7.3.6P4) using "mount.cifs", and browsing through the folders suddenly it stops working, freezing even hanging the terminal.

In "dmesg" we can see:


[871658.241854]  CIFS VFS: No response for cmd 50 mid 34155
[871664.275100]  CIFS VFS: RFC1001 size 166 bigger than SMB for Mid=34159
[871664.275107] Bad SMB: : dump of 48 bytes of data at 0xffff88011d4341c0
[871664.275114]  000000a6 424d53ff 00000032 80018800 � . . . � S M B 2 . . . . . . .
[871664.275121]  00000000 00000000 00000000 07260040 . . . . . . . . . . . . @ . & .
[871664.275127]  856f0800 6c00020a 02000000 00003800 . . o . . . . l . . . . . 8 . .
[871679.234890]  CIFS VFS: No response for cmd 50 mid 34159
[871685.250658]  CIFS VFS: RFC1001 size 166 bigger than SMB for Mid=34163
[871685.250663] Bad SMB: : dump of 48 bytes of data at 0xffff88011d434540
[871685.250668]  000000a6 424d53ff 00000032 80018800 � . . . � S M B 2 . . . . . . .
[871685.250673]  00000000 00000000 00000000 07260040 . . . . . . . . . . . . @ . & .
[871685.250678]  85730800 6c00020a 02000000 00003800 . . s . . . . l . . . . . 8 . .
[871700.198024]  CIFS VFS: No response for cmd 50 mid 34163
[871706.223930]  CIFS VFS: RFC1001 size 166 bigger than SMB for Mid=34167
[871706.223936] Bad SMB: : dump of 48 bytes of data at 0xffff88011d4348c0
[871706.223941]  000000a6 424d53ff 00000032 80018800 � . . . � S M B 2 . . . . . . .
[871706.223946]  00000000 00000000 00000000 07260040 . . . . . . . . . . . . @ . & .
[871706.223951]  85770800 6c00020a 02000000 00003800 . . w . . . . l . . . . . 8 . .

(The text above is a sample).