[Bug 569610] [NEW] "Kernel unaligned access at TPC" causing network/system to become slow and/or unresponsive

[Luke J Militello]

Public bug reported:

Binary package hint: linux-image-2.6.24-27-sparc64-smp

These few lines kept showing up in dmesg/logs over the past few weeks
and then started to cause the system/network in question to become slow
and unresponsive leading to a hard reboot to remedy.

Apr  7 16:01:48 Hal kernel: [1076377.260268] Kernel unaligned access at TPC[6a1504] tcp_transmit_skb+0x1ac/0x8c0
Apr  7 16:01:48 Hal kernel: [1076377.260330] Kernel unaligned access at TPC[6a150c] tcp_transmit_skb+0x1b4/0x8c0
Apr  7 16:01:48 Hal kernel: [1076377.260355] Kernel unaligned access at TPC[68e724] ip_queue_xmit+0x14c/0x5a0
Apr  7 16:01:48 Hal kernel: [1076377.260390] Kernel unaligned access at TPC[68e734] ip_queue_xmit+0x15c/0x5a0
Apr  7 16:01:48 Hal kernel: [1076377.260418] Kernel unaligned access at TPC[58e904] ip_fast_csum+0xc/0x80
Apr  7 16:32:21 Hal kernel: [1078210.103332] Kernel unaligned access at TPC[6a1504] tcp_transmit_skb+0x1ac/0x8c0
Apr  7 16:32:21 Hal kernel: [1078210.103406] Kernel unaligned access at TPC[6a150c] tcp_transmit_skb+0x1b4/0x8c0
Apr  7 16:32:21 Hal kernel: [1078210.103437] Kernel unaligned access at TPC[68e724] ip_queue_xmit+0x14c/0x5a0
Apr  7 16:32:21 Hal kernel: [1078210.103474] Kernel unaligned access at TPC[68e734] ip_queue_xmit+0x15c/0x5a0
Apr  7 16:32:21 Hal kernel: [1078210.103501] Kernel unaligned access at TPC[58e904] ip_fast_csum+0xc/0x80

I'm not sure if this is kernel related or the fact that I am running
ifenslave with interface bonding in fault-tolerant mode.

My system is a Sun Enterprise 420R.
I'm running Ubuntu 8.04.4 w/4GB of RAM.

CPU Info...

cpu		: TI UltraSparc II  (BlackBird)
fpu		: UltraSparc II integrated FPU
prom		: OBP 3.23.0 1999/06/30 13:53
type		: sun4u
ncpus probed	: 4
ncpus active	: 4
D$ parity tl1	: 0
I$ parity tl1	: 0
Cpu0ClkTck	: 000000001ad35932
Cpu1ClkTck	: 000000001ad35932
Cpu2ClkTck	: 000000001ad35932
Cpu3ClkTck	: 000000001ad35932
MMU Type	: Spitfire
State:
CPU0:		online
CPU1:		online
CPU2:		online
CPU3:		online

Network card info via dmesg...

[  139.086540] PCI: Enabling device: (0000:02:00.0), cmd 2
[  139.092436] eth1: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[15] 00:03:ba:85:5b:01
[  139.266151] PCI: Enabling device: (0000:02:01.0), cmd 2
[  139.272054] eth2: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[16] 00:03:ba:85:5b:02
[  139.446977] PCI: Enabling device: (0000:03:02.0), cmd 2
[  139.452954] eth3: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[17] 00:03:ba:85:5b:03
[  139.627883] PCI: Enabling device: (0000:03:03.0), cmd 2
[  139.633963] eth4: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[18] 00:03:ba:85:5b:04
[  139.807491] PCI: Enabling device: (0000:05:00.0), cmd 2
[  139.813690] eth5: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[19] 00:03:ba:85:20:e5
[  139.990262] PCI: Enabling device: (0000:05:01.0), cmd 2
[  139.996483] eth6: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[20] 00:03:ba:85:20:e6
[  140.170039] PCI: Enabling device: (0000:06:02.0), cmd 2
[  140.176496] eth7: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[21] 00:03:ba:85:20:e7
[  140.350911] PCI: Enabling device: (0000:06:03.0), cmd 2
[  140.357394] eth8: Sun Cassini+ (64bit/33MHz PCI/Cu) Ethernet[22] 00:03:ba:85:20:e8

Bonding info via dmesg...

[  143.262268] Ethernet Channel Bonding Driver: v3.2.3 (December 6, 2007)
[  143.339438] bonding: MII link monitoring set to 100 ms

Bonding options set in '/etc/network/interfaces'...

post-up ifenslave bond0 eth1 eth5
pre-down ifenslave -d bond0 eth1 eth5

Bonding options loaded via '/etc/modules'...

bonding mode=active-backup miimon=100 max_bonds=4

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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"Kernel unaligned access at TPC" causing network/system to become slow and/or unresponsive
https://bugs.launchpad.net/bugs/569610
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