Comment # 15 on bug 1202851 from Larry Finger

I realized that the 178000 should have been 0x178000, but your getting the same
as I did means that we are running the same code.

When I do 'list 0x178000', I get 

(gdb) list *0x178000
0x178000 is in bootp_input
(/usr/src/debug/virtualbox-6.1.36-2.1.x86_64/src/VBox/Devices/Network/slirp/bootp.c:624).
Downloading 0.03 MB source file
/usr/src/debug/virtualbox-6.1.36-2.1.x86_64/src/VBox/Devices/Network/slirp/bootp.c
619         {                                                                   
620             LogRel(("NAT: DHCP Inform was ignored no boot client was
found\n"));
621             return -1;
622         }
623
624         LogRel(("NAT: DHCP offered IP address %RTnaipv4\n",
bc->addr.s_addr));
625         offReply = dhcp_send_ack(pData, bp, bc, m, /* fDhcpRequest=*/ 0);
626         return offReply;
627     }

When the error happens at line 624. It looks as if struct bc->addr is invalid.
The code checks bc, but not bc->addr. It will be easy to check the second
struct and break out, but it may lead to other problems as this is an effect,
not the real cause! At least I have the data for a good bugzilla report at
Oracle. Thanks for your help.