Hi @JBPhilippin !
"_soc_xgs3_mem_dma: EXT_L2_ENTRY_TCAM.esm0 failed (NAK)" means System on Chip (SoC) type XGS3 (Broadcom StrataXGS series, in particular Tomahawk3) attempted memory (mem) access using direct memory access (DMA) in order to retrieve an Ethernet Layer 2 entry (MAC address) from the ternary content-addressable memory (TCAM). The request failed (NAK, not acknowledged).
This happens from time to time because of rare memory errors, most of which are self-correcting, but if you see a lot of such messages, I agree with @-Alex- , contact HPE TAC for further investigation.