Red Hat Enterprise Linux 6 kdump hangs on VMWare ESX 5.

Solution Verified - Updated -

Issue

  • Kdump crash kernel hangs or panics on Red Hat Enterprise Linux 6 (RHEL 6) on VMware platform ESX prior to 5.0 Update2 and 5.1.
  • The kdump process usually hang after loading the some module and some messages are printed as below:
the screen hang at INFO: task async/1:153 blocked for more than  120 seconds. 
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

Environment

  • Red Hat Enterprise Linux 6
  • kdump
  • VMware ESX prior to versions 5.0 Update2 and 5.1.

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