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Oracle Linux Server Rebooted Unexpectedly With the Following Error: "kernel: cifs_vfs_err: 4 callbacks suppressed" (Doc ID 2626218.1)

Last updated on JANUARY 07, 2020

Applies to:

Linux OS - Version Oracle Linux 7.6 with Unbreakable Enterprise Kernel [4.14.35] and later
Linux x86-64

Symptoms

An Oracle Linux 7 server, that was part of a database cluster, rebooted unexpectedly.

Prior to the reboot the following errors relating to the database being locked were logged:

Dec 19 21:00:56 <HOSTNAME> journal: Could not ensure resource existence: database is locked (strerror of errno (not necessarily related): Resource temporarily unavailable)
Dec 19 21:00:56 <HOSTNAME> journal: Could not ensure resource existence: database is locked (strerror of errno (not necessarily related): Resource temporarily unavailable)
Dec 19 21:00:56 <HOSTNAME> journal: Could not ensure resource existence: database is locked (strerror of errno (not necessarily related): Resource temporarily unavailable)

The following CIFS errors were also observed:

Dec 19 22:00:02 <HOSTNAME> kernel: cifs_vfs_err: 4 callbacks suppressed
Dec 19 22:01:01 <HOSTNAME> systemd: Started Session 60429 of user root.
Dec 19 22:02:12 <HOSTNAME> kernel: cifs_vfs_err: 18 callbacks suppressed
Dec 19 22:07:12 <HOSTNAME> kernel: cifs_vfs_err: 4 callbacks suppressed
Dec 19 22:10:01 <HOSTNAME> systemd: Started Session 60430 of user root.
Dec 19 22:10:01 <HOSTNAME> kernel: cifs_vfs_err: 4 callbacks suppressed

OSWatcher logs show there was high iowait on the system in the lead-up to the time of the reboot, but not on the local disk:

zzz ***Thu Dec 19 21:37:17 EST 2019
avg-cpu: %user %nice %system %iowait %steal %idle
15.31 0.00 13.56 23.56 0.00 47.57

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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