Hi,
A bug relevant to DHCP was corrected with a similar (not identical) message. What is the software version of your device ? (show version)
In the K.14.65 :
"Crash (PR_0000056868) — In some cases with DHCP snooping enabled globally and on a VLAN,
the switch might reboot unexpectedly with a message similar to the following.
Software exception at alloc_free.c:646 -- in 'tDevPollTx', task ID =
0xa9a1300
-> buf already freed by 0x0A96BC00, op=0x00000000"
Bye.