Alignment trap in kernel

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1

Hi guys,

Is what I’m seeing below a bad thing or nothing to be concerned about?

Mark

[ 369.618560] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xde4e002e FSR 0x001
[ 369.628570] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xde4e001e FSR 0x001
[ 369.638549] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 369.648498] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 370.626647] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xdee9002e FSR 0x001
[ 370.636627] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xdee9001e FSR 0x001
[ 370.646606] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xdee9002e FSR 0x001
[ 370.656585] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xdee9002e FSR 0x001
[ 372.639068] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xded9802e FSR 0x001
[ 372.649078] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xded9801e FSR 0x001
[ 372.659088] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 372.669067] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 376.648101] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xde4e002e FSR 0x001
[ 376.658142] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xde4e001e FSR 0x001
[ 376.668121] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 376.678131] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 384.650604] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xde4e002e FSR 0x001
[ 384.660583] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xde4e001e FSR 0x001
[ 384.670562] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 384.680541] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 385.996582] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xded9802e FSR 0x001
[ 386.006591] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xded9801e FSR 0x001
[ 386.016571] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 386.026550] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 386.996459] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xded9802e FSR 0x001
[ 387.006439] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xded9801e FSR 0x001
[ 387.016448] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 387.026397] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 388.996612] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xde4e002e FSR 0x001
[ 389.006591] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xde4e001e FSR 0x001
[ 389.016571] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 389.026550] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xde4e002e FSR 0x001
[ 392.996551] Alignment trap in kernel: swapper (0) PC=0xbf00e72c Instr=0xe897000f Address=0xded9802e FSR 0x001
[ 393.006561] Alignment trap in kernel: swapper (0) PC=0xbf00e74c Instr=0xe89c000f Address=0xded9801e FSR 0x001
[ 393.016540] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001
[ 393.026550] Alignment trap in kernel: swapper (0) PC=0xbf01d8c8 Instr=0xe898000a Address=0xded9802e FSR 0x001

2

mark hubrich <meistro57@gmail.com> writes:

Hi guys,

Is what I'm seeing below a bad thing or nothing to be concerned about?

Mark

[ 369.618560] Alignment trap in kernel: swapper (0) PC=0xbf00e72c
Instr=0xe897000f Address=0xde4e002e FSR 0x001

Do you have ipv6 enabled?

3

How can I find out?

4

Why yes I believe I do…

usb0 Link encap:Ethernet HWaddr FA:46:8A:06:A0:96
inet addr:192.168.1.105 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::f846:8aff:fe06:a096/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:4169 errors:0 dropped:0 overruns:0 frame:0
TX packets:826 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1098163 (1.0 MiB) TX bytes:74586 (72.8 KiB)

5

How can I find out?

$ cat /proc/net/if_inet6

If the output contains a line ending with your network device, such as:

blah blah blah eth0

Then you have ipv6 enabled for that device.

6

Sometimes I have the same problem.
I don't know why but when I reboot board the problem disappear...

7

mark hubrich <meistro57@gmail.com> writes:

Do you have ipv6 enabled?

Why yes I believe I do...

usb0 Link encap:Ethernet HWaddr FA:46:8A:06:A0:96
          inet addr:192.168.1.105 Bcast:0.0.0.0 Mask:255.255.255.0
          inet6 addr: fe80::f846:8aff:fe06:a096/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
          RX packets:4169 errors:0 dropped:0 overruns:0 frame:0
          TX packets:826 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1098163 (1.0 MiB) TX bytes:74586 (72.8 KiB)

Do the messages go away if you "modprobe -r ipv6"?

8

Do the messages go away if you “modprobe -r ipv6”?

Here’s what I get…

root@beagleboard:~# modprobe -r ipv6

FATAL: Module ipv6 is in use.

If the output contains a line ending with your network device, such as:

root@beagleboard:~# cat /proc/net/if_inet6

00000000000000000000000000000001 01 80 10 80 lo

fe800000000000005847cefffe57befe 02 40 20 80 usb0

It doesn’t seem to do it until I connect via x11vnc

Mark

9

mark hubrich <meistro57@gmail.com> writes:

Do the messages go away if you "modprobe -r ipv6"?

Here's what I get...

    root@beagleboard:~# modprobe -r ipv6

FATAL: Module ipv6 is in use.

If the output contains a line ending with your network device, such as:

root@beagleboard:~# cat /proc/net/if_inet6
00000000000000000000000000000001 01 80 10 80 lo
fe800000000000005847cefffe57befe 02 40 20 80 usb0

It doesn't seem to do it until I connect via x11vnc

You need to deconfigure ipv6 on all interfaces first. In fact, doing
that should be enough to stop the code being used.

10

After a reboot it went away…

root@beagleboard:~# cat /proc/net/if_inet6

00000000000000000000000000000001 01 80 10 80 lo

root@beagleboard:~# modprobe -r ipv6

FATAL: Module ipv6 is in use.

Mark