The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
To allow you to troubleshoot an issue where any user or kernel
thread sleeps in the TASK_UNINTERRUPTIBLE
state (D state) for more than the time
interval defined by the parameter
kernel.hung_task_timeout_secs, use
sysctl to set the value of
kernel.hung_task_panic to 1 so that the
system panics and generates a vmcore for
analysis.
# sysctl -w kernel.hung_task_panic=1
kernel.hung_task_panic = 1
The setting remains in force only until the system is rebooted.
To make the setting persist after the system is rebooted, add it
to the /etc/sysctl.conf file. To restore the
default behavior, set the value of
kernel.hung_task_panic to 0.
For more information, see Section 4.2.2, “Changing Kernel Parameters” and Section 4.2.4, “Parameters that Control Kernel Panics”.