Bug ID 981485: Neurond enters a restart loop after FPGA update.

Last Modified: Oct 13, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4, 16.0.0,, 16.0.1,,, 16.1.0

Opened: Jan 12, 2021
Severity: 3-Major


After FPGA firmware upgrade, the neurond process might enter a restart loop, unable to recover. When the problem is present you might see logs similar to: -- notice chmand[6674]: 012a0005:5: FPGA PNP FW upgrade check: req type 0, file:Latest -- notice chmand[6674]: 012a0005:5: FPGA: Requesting type: 0, vers: Latest -- notice chmand[6674]: 012a0005:5: FPGA: current type: 2, vers: hsb_5SGXEA7H2F35C2_t37dc_1d10_v5.23.5.0_d20.06.11.00.bit -- notice chmand[6674]: 012a0005:5: FPGA: match for type: 0, vers: hsb_5SGXEA7H2F35C2_t37dc_1d10_v5.6.7.0_d20.06.11.00.bit -- notice chmand[6674]: 012a0005:5: removed /var/db/mcpdb.* FPGA current disk firmware updated to: /L7L4_BALANCED_FPGA type: 0 -- notice chmand-fpga-pnp[17551]: Stopping TMM, BCM56xxd, and neurond -- notice logger[17553]: /bin/bash /etc/init.d/fw_pnp_upgrade upgrade restart ==> /usr/bin/bigstart stop tmm bcm56xxd neurond


Enhanced flow acceleration provided by the Neuron chip cannot be utilized.


FPGA firmware mismatch, leading to FPGA firmware upgrade.


Perform a full system restart.

Fix Information


Behavior Change