Alpha: bad unaligned access handling

From: Jan-Benedict Glaw (jbglaw@lug-owl.de)
Date: Wed Feb 14 2001 - 09:48:09 EST

Hi!

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 don't
know much about alpha assemlbly language so somebody else should have
a look at that;( Btw., when such an unaligned trap has happened, I also
get transmit timeouts on my network card (which is:
00:0c.0 Ethernet controller: 3Com Corporation 3c905 100BaseTX [Boomerang]

NETDEV WATCHDOG: eth0: transmit timed out
eth0: transmit timed out, tx_status 00 status e000.
  Flags; bus-master 1, full 1; dirty 1470429(13) current 1470445(13).
  Transmit list 477a42d0 vs. fffffc00077a42d0.
  0: @fffffc00077a4200 length 80000042 status 00000042
...

MfG, JBG 

-- 
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/* Jan-Benedict Glaw <jbglaw@lug-owl.de> -- +49-177-5601720 */
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This archive was generated by hypermail 2b29 : Thu Feb 15 2001 - 21:00:24 EST