Error message “ddr_sdram_periodic” is seen in core output after an FPC/DPC reboots

This article addresses the case where a Flexible PIC Concentrator (FPC) and/or Dense Port Concentrator (DPC) reboot occurs, and a core dump containing the backtrace item ddr_sdram_periodic is generated. If SDRAM errors appear in the NVRAM output, then this is most likely a hardware issue. An RMA is recommended.

An FPC/DPC rebooted and generated a core dump. The backtrace of the core dump has ddr_sdram_periodic as one of the elements of the back trace.

In this case, the FPC/DPC restart was likely due to ECC errors in the SDRAM of the board.
Check the NVRAM output for the FPC that rebooted.

If you see SDRAM Errors in the NVRAM output, then this is most likely a hardware issue and an RMA is recommended.

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James Palmer

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