Alignment trap in kernel

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1

I am about to compile and use my version of Angstrom, just wanted to
ask a question (I know it is an old stock kernel)

I am running stock Angstrom 2010.7-test-20110220 (Linux beagleboard
2.6.32 #3 PREEMPT Thu Mar 17 08:56:19 CET 2011 armv7l unknown )
BB-xM rev C is connected to the host PC using a D-link router.
Whenever I ping the board from another machine this warning is emitted
by kernel, for each ping command exactly one line, and completely
reproducible.
[ 72.295623] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xdf3c802a FSR 0x001
[ 73.297302] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde49002a FSR 0x001
[ 74.299072] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde44802a FSR 0x001
[ 75.300781] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde41802a FSR 0x001
[ 76.302246] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xdf13002a FSR 0x001
[ 77.303985] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde49002a FSR 0x001
[ 78.305694] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde44802a FSR 0x001
[ 79.307434] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde41802a FSR 0x001
[ 80.309143] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xdf13002a FSR 0x001
[ 81.310882] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xdf3c802a FSR 0x001
[ 82.312591] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde49002a FSR 0x001
[ 83.314361] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xde44802a FSR 0x001
[ 84.315856] Alignment trap in kernel: gnome-settings- (924)
PC=0xc0436954 Instr=0xe8930003 Address=0xde41802a FSR 0x001
[ 85.317535] Alignment trap in kernel: gvfs-hal-volume (934)
PC=0xc0436954 Instr=0xe8930003 Address=0xdf13002a FSR 0x001
[ 86.319335] Alignment trap in kernel: bonobo-activati (947)
PC=0xc0436954 Instr=0xe8930003 Address=0xdf3c802a FSR 0x001

I disabled ipv6 following another thread using this:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.usb0.disable_ipv6 = 1
and /proc/net/if_inet6 is empty so it confirms ipv6 gone plus ifconfig
shows no ipv6.

But it did not change anything, I know it might be a harmless kernel
warning and my distribution is old.
However I was just curious if it is only me, and if new kernels show
similar symptoms.

thanks

2

have same error :(((

2011/9/23 dashesy <dashesy@gmail.com>

3

dashesy <dashesy@gmail.com> writes:

I am about to compile and use my version of Angstrom, just wanted to
ask a question (I know it is an old stock kernel)

I am running stock Angstrom 2010.7-test-20110220 (Linux beagleboard
2.6.32 #3 PREEMPT Thu Mar 17 08:56:19 CET 2011 armv7l unknown )
BB-xM rev C is connected to the host PC using a D-link router.
Whenever I ping the board from another machine this warning is emitted
by kernel, for each ping command exactly one line, and completely
reproducible.
[ 72.295623] Alignment trap in kernel: swapper (0) PC=0xc0436954
Instr=0xe8930003 Address=0xdf3c802a FSR 0x001

Try this patch: http://git.mansr.com/?p=linux-xm;a=commitdiff;h=d204c927d856cbe7d7fa90b0703d1ab5b7c6be80

4

Anyone had any luck powering a beagleboard from one of these?

Unicom Power over Ethernet Splitter
http://www.l-com.com/item.aspx?id=11050

---Kelly

5

not work, still get the same error : Alignment trap in kernel: swapper (0) PC=0xbf020578 Instr=0xe897000f Address=0xdfb7002e FSR 0x001

2011/9/23 Måns Rullgård <mans@mansr.com>

6

Melahat Tunalı Karakaş <meltunali@gmail.com> writes:

dashesy <dashesy@gmail.com> writes:

> I am about to compile and use my version of Angstrom, just wanted to
> ask a question (I know it is an old stock kernel)
>
> I am running stock Angstrom 2010.7-test-20110220 (Linux beagleboard
> 2.6.32 #3 PREEMPT Thu Mar 17 08:56:19 CET 2011 armv7l unknown )
> BB-xM rev C is connected to the host PC using a D-link router.
> Whenever I ping the board from another machine this warning is emitted
> by kernel, for each ping command exactly one line, and completely
> reproducible.
> [ 72.295623] Alignment trap in kernel: swapper (0) PC=0xc0436954
> Instr=0xe8930003 Address=0xdf3c802a FSR 0x001

Try this patch:
http://git.mansr.com/?p=linux-xm;a=commitdiff;h=d204c927d856cbe7d7fa90b0703d1ab5b7c6be80

not work, still get the same error : Alignment trap in kernel: swapper (0)
PC=0xbf020578 Instr=0xe897000f Address=0xdfb7002e FSR 0x001

Strange, it works for me. Are you sure you applied it properly?

7

yes :(((

2011/9/23 Måns Rullgård <mans@mansr.com>