Bug ID 929173: Watchdog reset due to CPU stall detected by rcu_sched

Last Modified: Apr 17, 2024

Affected Product(s):
BIG-IP LTM, TMOS, vCMP(all modules)

Known Affected Versions:
13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4

Opened: Jul 21, 2020

Severity: 4-Minor

Symptoms

Rcu_sched detected CPU stall, which can cause vCMP host reboot. The device reboots without core and records "Host Watchdog timeout." Typically there will logs in kern.log similar to: err kernel: : [526684.876928] INFO: rcu_sched detected stalls on CPUs/tasks: ...

Impact

CPU RCU stalls and host watchdog reboots

Conditions

Host undergoing a watchdog reset in a vCMP environment.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips