Tons of "BUG: dst overflow ..." messages

Just logged into my router, which is running 2.6.9-rc2-bk1 (or -bk2, not 
sure), and saw a buttload of the following messages:

[jgarzik@pretzel g]$ dmesg -s123000 |grep -c BUG
488

[jgarzik@pretzel g]$ dmesg -s123000 |grep BUG|sort|uniq
BUG: dst underflow 0: cf5dd180 at f8c0be5d
BUG: dst underflow 0: cf5dd180 at f8c0d15c
BUG: dst underflow 0: cf5dd180 at f8c1656f


router seems to be working fine regardless of these BUGs.

ifconfig, .config, and lspci attached.

Is this a known, already-fixed issue?

	Jeff

On Wed, 29 Sep 2004 00:12:37 -0400
Jeff Garzik [off-list ref] wrote:

BUG: dst underflow 0: cf5dd180 at f8c0be5d
BUG: dst underflow 0: cf5dd180 at f8c0d15c
BUG: dst underflow 0: cf5dd180 at f8c1656f

Can you match up the 0xf8xxxxxx addresses to spots
in your System.map?  Thanks.

David S. Miller wrote:

On Wed, 29 Sep 2004 00:12:37 -0400
Jeff Garzik [off-list ref] wrote:

quoted

BUG: dst underflow 0: cf5dd180 at f8c0be5d
BUG: dst underflow 0: cf5dd180 at f8c0d15c
BUG: dst underflow 0: cf5dd180 at f8c1656f

Can you match up the 0xf8xxxxxx addresses to spots
in your System.map?  Thanks.

All my addresses in System.map start with 0xc0xxxxxx.

But /proc/modules OTOH...

nfsd 212256 9 - Live 0xf8c96000
exportfs 5248 1 nfsd, Live 0xf8bcb000
e1000 80132 0 - Live 0xf8be3000
8139too 21504 0 - Live 0xf8bc4000
crc32 4480 1 8139too, Live 0xf8b68000
ipv6 232192 38 - Live 0xf8c01000
		       ^^^^  appears to be this
ip_nat_irc 4080 0 - Live 0xf8839000
ip_conntrack_irc 70960 1 ip_nat_irc, Live 0xf8ba9000
ip_nat_ftp 4592 0 - Live 0xf8b47000
ip_conntrack_ftp 71856 1 ip_nat_ftp, Live 0xf8b96000
ipt_MASQUERADE 3584 1 - Live 0xf8b66000
iptable_nat 20644 4 ip_nat_irc,ip_nat_ftp,ipt_MASQUERADE, Live 0xf8b6e000
iptable_mangle 2688 0 - Live 0xf8830000
ipt_LOG 6656 1 - Live 0xf8b41000
ipt_limit 2432 1 - Live 0xf883d000
ipt_state 2048 3 - Live 0xf883b000
ip_conntrack 38200 7 
ip_nat_irc,ip_conntrack_irc,ip_nat_ftp,ip_conntrack_ftp,ipt_MASQUERADE,iptable_nat,ipt_state, 
Live 0xf8b4a000
iptable_filter 2688 1 - Live 0xf8810000
ip_tables 16256 7 
ipt_MASQUERADE,iptable_nat,iptable_mangle,ipt_LOG,ipt_limit,ipt_state,iptable_filter, 
Live 0xf8827000
dm_mod 48896 0 - Live 0xf8840000
battery 10252 0 - Live 0xf882c000
raid1 13824 2 - Live 0xf8815000
ata_piix 7044 5 - Live 0xf8824000
sata_promise 7556 2 - Live 0xf8812000
libata 36612 2 ata_piix,sata_promise, Live 0xf881a000

In article [off-list ref] (at Wed, 29 Sep 2004 00:57:52 -0400), Jeff Garzik [off-list ref] says:

David S. Miller wrote:

quoted

On Wed, 29 Sep 2004 00:12:37 -0400
Jeff Garzik [off-list ref] wrote:

quoted

BUG: dst underflow 0: cf5dd180 at f8c0be5d

:

quoted

Can you match up the 0xf8xxxxxx addresses to spots
in your System.map?  Thanks.

:

ipv6 232192 38 - Live 0xf8c01000
		       ^^^^  appears to be this

Hmm, I haven't met this (during TAHI test against latest tree).
Would you try latest bk tree?
Plus, if you know how to reproduce this, tell me.

Thank you.

--yoshfuji

On Wed, Sep 29, 2004 at 12:12:37AM -0400, Jeff Garzik wrote:

Just logged into my router, which is running 2.6.9-rc2-bk1 (or -bk2, not 
sure), and saw a buttload of the following messages:

I've been seeing this too for a week or two on 2.6.8-1.521smp, which
is some kind of Red Hat bastardized version of 2.6.8 that comes with
Fedora Core 2.

BUG: dst underflow 0: 3bcf9a80 at 42350024

ipt_state 5569 1 - Live 0x4231e000
iptable_mangle 6209 0 - Live 0x42321000
mii 7617 2 usbnet,e100, Live 0x42324000
ip_conntrack 30929 3 ipt_MASQUERADE,iptable_nat,ipt_state, Live 0x42329000
ipv6 233701 50 - Live 0x42345000		<====
ipt_mark 5441 1 - Live 0x423f9000
ipt_MASQUERADE 6849 1 - Live 0x423fc000
e100 33861 0 - Live 0x423ff000

I'm running 6to4 on this machine, but not using it as a router.

Any easy way to find out which symbol in ipv6.ko this address is in?


--L

YOSHIFUJI Hideaki / 吉藤英明 wrote:

In article [off-list ref] (at Wed, 29 Sep 2004 00:57:52 -0400), Jeff Garzik [off-list ref] says:

quoted

David S. Miller wrote:

quoted

On Wed, 29 Sep 2004 00:12:37 -0400
Jeff Garzik [off-list ref] wrote:

quoted

BUG: dst underflow 0: cf5dd180 at f8c0be5d

:

quoted

quoted

Can you match up the 0xf8xxxxxx addresses to spots
in your System.map?  Thanks.

:

quoted

ipv6 232192 38 - Live 0xf8c01000
	       ^^^^  appears to be this

Hmm, I haven't met this (during TAHI test against latest tree).
Would you try latest bk tree?

I will try soon...  it's my fileserver and router, so does not get 
upgraded very often.

Plus, if you know how to reproduce this, tell me.

Sorry, I do not know :(

Regards,

	Jeff