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Cisco Bug: CSCun45306 - DN2:P2:Running SPECJVM stress test, system got rebooted

Last Modified

Mar 08, 2018

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.1(0.4)

Description (partial)

Symptom:
Unexpected system reboot with RHEL 6.5  due to frequent bmc-watchdog driver timeouts.

Conditions:
This issue is caused by RHEL 6.5 due to the faulty IPMI driver.
The bmc-watchdog daemon in RHEL 6.5 will be enabled when OS boot. This daemon does not detect OS IPMI driver since it failed to acess "/dev/ipmi0",so it will create system IO port (ca2/ca3) to communicate with BMC, however, the action creating system IO port will conflict with built-in OS ipmi driver cause built-in OS ipmi driver is already created this IO port to communicate with BMC.
Therefore, we found this bmc-watchdog will sometimes receive the wrong data that should response to OS ipmi driver, and this bmc-watchdog will stop running itself because the data is not correct. And then, the timer of BMC watchdog will count down to 0 and the corresponding hard reset action and event log will be done by BMC.
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