System details: gcc version 3.2, Gentoo sparc 1.4_rc1 on ultra-10, SUN4U /w kernel 2.4.20 (vanilla). Package: net-misc/dhcp version 3.0-rc4 (ISC Dynamic Host Configuration Protocol) Compile flags (defaults): CHOST="sparc-unknown-linux-gnu" CFLAGS="-mcpu=v8 -mtune=v9 -O2 -pipe" CXXFLAGS="-O3 -pipe" Problem: dhcpd dies with BUS error when first DHCP packets arrive. # dhcpd -d -p 67 binding to user-specified port 67 Internet Software Consortium DHCP Server V3.0pl1 Copyright 1995-2001 Internet Software Consortium. All rights reserved. For info, please visit http://www.isc.org/products/DHCP Wrote 0 deleted host decls to leases file. Wrote 0 new dynamic host decls to leases file. Wrote 0 leases to leases file. Listening on LPF/eth0/08:00:20:a2:2c:9c/192.168.144.0/24 Sending on LPF/eth0/08:00:20:a2:2c:9c/192.168.144.0/24 Sending on Socket/fallback/fallback-net Bus error Here is a packet capture of the incoming packet: # tcpdump -n -vv -s 2048 -X 09:43:06.213057 0.0.0.0.68 > 255.255.255.255.67: [no cksum] xid:0x20950884 vend-rfc1048 DHCP:DISCOVER VC:"SUNW.JSIIep" (ttl 123, id 2, len 576) 0x0000 4500 0240 0002 0000 7b11 3dac 0000 0000 E..@....{.=..... 0x0010 ffff ffff 0044 0043 022c 0000 0101 0600 .....D.C.,...... 0x0020 2095 0884 0000 0000 0000 0000 0000 0000 ................ 0x0030 0000 0000 0000 0000 0800 2095 1dc4 0000 ................ 0x0040 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0050 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0060 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0070 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0080 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0090 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00a0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00b0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00c0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00d0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00e0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x00f0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0100 0000 0000 0000 0000 6382 5363 3501 013c ........c.Sc5..< 0x0110 0b53 554e 572e 4a53 4949 6570 ff00 0000 .SUNW.JSIIep.... 0x0120 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0130 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0140 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0150 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0160 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0170 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0180 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0190 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01a0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01b0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01c0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01d0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01e0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x01f0 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0200 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0210 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0220 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0x0230 0000 0000 0000 0000 0000 0000 0000 0000 ................ Workaround: Recompile dhcp without -O2 -pipe (i.e. CFLAGS="-mcpu=v8 -mtune=v9")
Looked into this a little tonight. It appears to the the -O flags causing the problem. Going to try contacting the authors to see if they have any suggestions. If all else fails, will implement replace-flags in ebuild.
I have discovered an architecture-independent bug in current Gentoo gcc that may be what you are seeing here if loop-unrolling is involved. http://bugs.gentoo.org/show_bug.cgi?id=14699
Tried posting the error to the dhcp mailing list but got no response. I have fixed the ebuild so it strips out the flags that were causing the Bus error (at least for me). Please rsync and (re-)emerge dhcp-3.0_p2 and let me know how it goes.
Closing
Recent Gentoo Bugzilla move caused the status of this to change. Changing back.
