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SubjectRe: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2


On Thu, 18 Aug 2011, Justin Piszcz wrote:

>
>
> On Thu, 18 Aug 2011, J. R. Okajima wrote:
>
>>
>> Justin Piszcz:
>>> Does anyone know if any kernel supports CIFS w/out crashing? I'd like to
>>> backup some CIFS shares, thanks.
>>>
>>>
>>> mount -t cifs //w2/x /mnt -o user=user,pass=pass
>>>
>>> [ 881.388836] CIFS VFS: cifs_mount failed w/return code = -22
>> :::
>>
>> Since it failed mounting, this patch will help you. Although the patch
>> will fix one bug, there still may exist another problem.
>>
>> http://marc.info/?l=linux-cifs&m=131345112022031&w=2
>
> Hi,
>
> Latest patch (this one) applied to linux-3.1-rc2 works, at least it mounted
> this time and did not instantly crash the kernel!
>
> I also tried the hostname again (and it did not crash the kernel, but it
> failed to mount).
>
> Used the IP and it mounted successfully:
> //10.0.0.11/x 28T 5.0T 23T 19% /mnt
> //10.0.0.11/y 19T 1.2T 18T 7% /mnt2
>
> It has not crashed yet (which is good), I'll apply this patch to my
> production machine and test taking backups of this data and let you know
> if it crashes again, thanks!
>
> Justin.


Hello,

It is working but very slowly:

Device eth6 [10.0.1.2] (1/1):
================================================================================
Incoming: Outgoing:
Curr: 37.60 MByte/s Curr: 0.44 MByte/s
Avg: 4.98 MByte/s Avg: 0.09 MByte/s
Min: 0.00 MByte/s Min: 0.00 MByte/s
Max: 40.79 MByte/s Max: 0.48 MByte/s
Ttl: 1.45 GByte Ttl: 26.77 MByte
Over 10GbE the other direction (Linux -> Windows (via Samba)) I get
500MiB/s, is CIFS slow?

I'll look into options to tweak the speed but this is very poor speed when
you have to transfer 5-10TB. However, it is not crashing anymore, so any
speed is better than that :)

Justin.



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