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SubjectRe: Alpha: bad unaligned access handling
On Wed, Feb 14, 2001 at 03:11:17PM -0200, Carlos Carvalho wrote:
> Jan-Benedict Glaw (jbglaw@lug-owl.de) wrote on 14 February 2001 15:48:
> >With my currently installed ping (netkit-ping 0.10-6 from Debian Woody)
> >I get unaligned accesses:
> >
> >ping(15953): unaligned trap at 00000001200030e4: 0000000120026b34 29 1
> >ping(15953): unaligned trap at 0000000120003110: 0000000120026b2c 29 2
> >
> >The worse part is: they seem to be handled The Wrong Way:
> >
> >[jbglaw@air:/home/jbglaw] $> ping -c 1 localhost
> >PING localhost (127.0.0.1): 56 data bytes
> >64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=13.8 ms
> >wrong data byte #8 should be 0x8 but was 0xdc
> > c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b
> > 2c 2d 2e 2f 0 0 0 0 0 0 0 0 0 0 0 0
> >
> >--- localhost ping statistics ---
> >1 packets transmitted, 1 packets received, 0% packet loss
> >round-trip min/avg/max = 13.8/13.8/13.8 ms
> >
> >
> >This is on a NoName Alpha box, running 2.4.0-test8-pre1 (with very good
> >uptimes), but I think 2.4.2-pre2 would do the same (wrong) things as
> >arch/alpha/kernel/traps.c wasn't really changed since ages...
>
> I also get these, with 2.2.18pre5 (plus some Andrea patches) and
> vanilla 2.2.19pre10 on a SMP UP2000.

This is an application problem, not a kernel one. You need to upgrade your
netkit.

Sean

P.S. I wrote a small wrapper to aid in the debugging of unaligned traps, which
I'll send to anyone who's interested.

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