[linux-azure] VMs crashing due to 503 SMB errors

[Joseph Salisbury]

Several Azure VMs on AKS and are experiencing some random node restarts.

The issues was narrowed down to a NULL pointer dereference in smb2_push_mandatory_locks().

The following commit fixes this issue:
6f582b273ec2 ("CIFS: Fix NULL-pointer dereference in smb2_push_mandatory_locks")

This commit landed in mainline as of v5.5-rc1. The commit has also been applied to linux-azure-bionic in Ubuntu-azure-5.0.0-1029.31 via stable updates.

However, this commit has not been applied to linux-azure-xenial, but it is needed there. Please apply the commit to xenial.

[Marcelo Cerri (mhcerri)]

Patch for review: https://lists.ubuntu.com/archives/kernel-team/2020-January/107061.html

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Guilherme G. Piccoli (gpiccoli)]

For reference, this patch is getting merged in -generic flavors too, worked on LP: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856949

Thanks Marcelo and Juergh for this work!
Cheers,

Guilherme

[pietro ameruoso (piameruo)]

Hi, is there any ETA regarding the xenial linux-azure kernel integration of this patch?

Regards

[Marcelo Cerri (mhcerri)]

Pietro. The linux-azure kernels containing this fix was released on 2020-02-18.