Hi all,
I'm running the 2.6.32.15 kernel on a Sun Blade 2500 with the tg3
driver.
gcc version is:
gcc --version
gcc (Debian 4.3.2-1.1) 4.3.2
When rx/tx/generic segmentation offloading is disabled:
ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: off
tx-checksumming: off
scatter-gather: off
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off
large receive offload: off
I've received several unaligned access messages:
Kernel unaligned access at TPC[6dae50]
Kernel unaligned access at TPC[6dae58]
Kernel unaligned access at TPC[6c8788]
Kernel unaligned access at TPC[6c8798]
Kernel unaligned access at TPC[704864]
They've only occurred once so far in a week or so, so I won't be able to
reproduce it at will.
The unaligned accesses appear to come from the following sources:
net/ipv4/tcp_output.c:tcp_transmit_skb():
6dae50: c2 26 e0 04 st %g1, [ %i3 + 4 ]
6dae58: c2 26 e0 08 st %g1, [ %i3 + 8 ]
If my analysis is correct, these are the two lines at 666 in 2.6.32.15:
th->seq = htonl(tcb->seq);
th->ack_seq = htonl(tp->rcv_nxt);
the problem being the unaligned th.
net/ipv4/ip_output.c:ip_queue_xmit():
6c8788: c2 24 20 0c st %g1, [ %l0 + 0xc ]
6c8798: c2 24 20 10 st %g1, [ %l0 + 0x10 ]
If my analysis is correct, these are the two lines at 376 in 2.6.32.15:
iph->saddr = rt->rt_src;
iph->daddr = rt->rt_dst;
the problem being an unaligned iph.
arch/sparc/lib/ipcsum.S:ip_fast_csum() (2nd asm instruction, unaligned iph)
I've uploaded the associated vmlinux for analysis to:
http://grsecurity.net/unaligned-vmlinux
Please keep me on CC for any replies.
Thanks,
-Brad
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