I just had this happen again and was able to capture some more information:
data access
Exception current instruction address: 0x0179af20
Machine Status Register: 0x0000b030
Data Access Register: 0x4777779b
Condition Register: 0x80002048
Data storage interrupt Register: 0x0000b030
Task: 0x166637e8 "rxPoll"
0x166637e8 (rxPoll): reboot_fn:intVct (0x300), oopsCount 0
Disabling memory protection until reboot
0x166637e8 (rxPoll): SRR0 = 0x180fa20, SRR1 = 0xb030 DSISR = 0xb030, DAR = 0x4777779b
0x166637e8 (rxPoll): IMISS = 0x0, ICMP = 0x0 DMISS = 0x4777779b, DCMP = 0x8002001d
0x166637e8 (rxPoll): HASH1 = 0x0, HASH2 = 0x3e1cddc0 RPA = 0x3ee32200
0x166637e8 (rxPoll): DEC = 0x0, IABR = 0x46daf EAR = 0x0
0x166637e8 (rxPoll): get_exc_data intVect(0x300)
data access
Exception current instruction address: 0x0179af20
Machine Status Register: 0x0000b030
Data Access Register: 0x4777779b
Condition Register: 0x80002048
Data storage interrupt Register: 0x0000b030
17e3700 vxTaskEntry +68 : 1dacedc ()
1dacedc RxPoll +458: _hsl_bcm_rx_handler_thread ()
2ddede0 _hsl_bcm_rx_handler_thread+d4 : sf_process_pkts_from_hw ()
343857c sf_process_pkts_from_hw+280: sfIngressData ()
1d8fc08 sfIngressData +260: sfL2IngressData ()
1d94f7c sfL2IngressData+2ac: sfL3IngressData ()
1d89290 sfL3IngressData+1ab8: 1906c68 ()
1906c68 IpPktInputHook +45c: IGWInSecurityProcessSlow ()
1910424 IGWInSecurityProcessSlow+3c : VxBitsBasicProcessFnSlow (38665ee8)
190bb0c VxBitsBasicProcessFnSlow+124: IGWFWProcessSlow ()
193ac40 IGWFWProcessSlow+74 : ADConnProcess ()
191a508 ADConnProcess +974: ADUdpProcess ()
191ec3c ADUdpProcess +37c: ALGSipUdpProcess ()
19a7eb8 ALGSipUdpProcess+28 : ALGSipProcess ()
19ab398 ALGSipProcess +34d0: ALGSipGetCallID ()
300 : 318 ()
318 : excExcHandle ()
17e12ec excExcHandle +2bc: taskSuspend ()