IBM Support

Linux crash with lin_tape driver

Technote (troubleshooting)


Problem(Abstract)

An IBM Spectrum Protect server running on RedHat 6.5 is configured with a Data Domain Virtual Tape Library, which emulates an IBM 3584 L32 library with LTO4 tape drives. The Linux system crashes with soft lockup errors with the lin_tape driver.

Symptom

The /var/log/messages file shows the following error at the time of the crash :

BUG: soft lockup - CPU#3 stuck for 67s! [dsmserv:817]

The Linux dmesg command shows the following messages prior to the crash :

lin_tape: unable to reserve the device
lin_tape 7:0:0:6: reservation conflict


Cause

The lin_tape driver needs to be upgraded and persistent reserve needs to be disabled on the IBM Spectrum Protect server and the lin_tape driver.

Diagnosing the problem

Verify the level of the lin_tape driver with the following command :

rpm -qi lin_tape

In this case, the lin_tape driver level was 2.9.5.
Verify the library configuration with the following IBM Spectrum Protect server administrative command :

q library <library-name> F=D

In this case, the library was defined with "Reset Drives : Yes".

Resolving the problem

Upgrade the lin_tape driver to minimum level 3.0.1.0, which fixes known issues with soft lock errors on Linux. The lin_tape driver is available from the Fix Central site.
Disable persistent reserve with the library with the following IBM Spectrum Protect server administrative command :

update library <library-name> resetdrives=no

Follow the directions in the IBM Tape Device Drivers Installation and User's Guide to disable persistent reserve with the lin_tape driver.

Document information

More support for: Tivoli Storage Manager
Server

Software version: All Supported Versions

Operating system(s): Linux

Reference #: 1972277

Modified date: 27 October 2017


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