Oracle Linux 6 RHCK system hang: processes blocked in ext4_file_open(), pick_next_task_fair() (Doc ID 1603966.1)

Last updated on DECEMBER 01, 2013

Applies to:

Linux OS - Version Oracle Linux 6.0 to Oracle Linux 6.4 [Release OL6 to OL6U4]
Linux x86-64
Linux x86

Symptoms

A Red Hat Enterprise Linux 6 (RHEL6) or Oracle Linux 6 (OL6) system running the Red Hat Compatible Kernel (RHCK) e.g. kernel-2.6.32-358.0.1.el6.x86_64 becomes unresponsive.
The load average of the system steadily increases leading to system hang.
Messages such as the following are reported to the system log (/var/log/messages, dmesg) denoting many processes blocked waiting on pick_next_task_fair() and/or ext4_file_open():

Changes

Variables for which the issue is known to occur include the use of:

Cause

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