Kernel 4.13.0-26 killed my CIFS mount

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pvanryn
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Kernel 4.13.0-26 killed my CIFS mount

Post by pvanryn » Sun Jan 14, 2018 12:02 pm

hey all,

Recently upgraded to Kernel 4.13.0-26-generic x86_64 to (partially) mitigate the Spectre / meltdown threat. Upon reboot, I can no longer mount my CIFS drive from the command line. I get
mount error(112): Host is down
even though the host isn't down.

I can still see the drive in my networked drives, and copy files, I just can't attach it to a mount point. If I reboot with the old kernel, everything is fine. I hate to leave my system vulnerable, is there anything else I can try? I have two other mint systems with the old kernel, and they mount the drive w/o any problem.

vimes666
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Re: Kernel 4.13.0-26 killed my CIFS mount

Post by vimes666 » Tue Jan 16, 2018 11:58 am

This is because the new kernel uses SMB 3.0 as default. This used to be SMB 1.0.
Your server is obviously able to speak SMB 1.0, but no SMB 3.0.
This can be corrected by upgrading your server to SMB 3.0 or
by forcing SMB 1.0 or (2.0 may also work) in your cifs mount statement in fstab, add option vers=1.0.

JeremyB
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Re: Kernel 4.13.0-26 killed my CIFS mount

Post by JeremyB » Tue Jan 16, 2018 5:49 pm

I would strongly suggest using the 4.4 kernels as they will get security patches for another 3 years

Innz
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Re: Kernel 4.13.0-26 killed my CIFS mount

Post by Innz » Fri Jan 19, 2018 2:52 am

vimes666 wrote:This is because the new kernel uses SMB 3.0 as default. This used to be SMB 1.0.
Your server is obviously able to speak SMB 1.0, but no SMB 3.0.
This can be corrected by upgrading your server to SMB 3.0 or
by forcing SMB 1.0 or (2.0 may also work) in your cifs mount statement in fstab, add option vers=1.0.
Awesome you just saved my skin!

pvanryn
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Re: Kernel 4.13.0-26 killed my CIFS mount

Post by pvanryn » Fri Jan 19, 2018 10:03 am

vimes666 wrote:This is because the new kernel uses SMB 3.0 as default. This used to be SMB 1.0.
Your server is obviously able to speak SMB 1.0, but no SMB 3.0.
This can be corrected by upgrading your server to SMB 3.0 or
by forcing SMB 1.0 or (2.0 may also work) in your cifs mount statement in fstab, add option vers=1.0.
Thank you for the help! :D

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