Server receiving many NMI soft lockups

This document (000019788) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP1
SUSE Linux Enterprise Server for SAP Applications 15 SP1
SUSE Linux Enterprise Server 12 SP 5
SUSE Linux Enterprise Server for SAP Applications 12 SP5
SUSE Linux Enterprise Server 12 SP4 (LTSS)
SUSE Linux Enterprise Server for SAP Applications 12 SP4

Situation

In the logs there are many NMI soft lockups.

The server has one or more NFS shares and there are many writes.

In the NMI, the RIP often reports one of the following:

nfs_commit_end
__nfs_commit_inode
nfs_scan_commit
nfs_wb_page

Resolution

This is a known issue in the kernel and is solved with the following kernels:

SUSE Linux Enterprise Server 15 Support Pack 1 --> 4.12.14-197.64 (Oct-20-2020)
SUSE Linux Enterprise Server 12 Support Pack 5 --> 4.12.14-122.46 (Oct-21-2020)
SUSE Linux Enterprise Server 12 Support Pack 4 --> 4.12.14-95.65 (Nov-26-2020) (LTSS)

The patch that provides the fix is (entry can be seen in the kernel package changelog):

* Mon Oct 12 2020 neilb@suse.de
- NFS: Revalidate the file mapping on all fatal writeback errors
(bsc#1177340).
- NFS: On fatal writeback errors, we need to call nfs_inode_remove_request() (bsc#1177340).

Cause

The problem is introduced by the following patch (entry can be seen in the kernel package changelog):

* Mon May 04 2020 neilb@suse.de
- NFS: Don't call generic_error_remove_page() while holding locks
(bsc#1170457).

Introduced in:

SUSE Linux Enterprise Server 15 Support Pack 1 --> 4.12.14-197.45.1 (June-10-2020)
SUSE Linux Enterprise Server 12 Support Pack 5 --> 4.12.14-122.23.1 (June-10-2020)
SUSE Linux Enterprise Server 12 Support Pack 4 --> 4.12.14-95.54.1 (June-10-2020)

Disclaimer

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Document ID:000019788
Creation Date: 17-Nov-2020
Modified Date:08-Dec-2020
- SUSE Linux Enterprise Server
- SUSE Linux Enterprise Server for SAP Applications

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