Mailing List Archive: Badness in local_bh

Badness in local_bh_enable

Apr 1, 2005, 12:24 AM

Post #1 of 10 (2552 views)

Hello list

i am not sure if this is related, but i discovered it after installing
xen: i've got the following message in dmesg:

Badness in local_bh_enable at kernel/softirq.c:140
[<c011f740>] local_bh_enable+0x80/0x90
[<c02572f9>] skb_checksum+0x129/0x2b0
[<c02c7a86>] schedule+0x306/0x530
[<c029036c>] udp_poll+0x9c/0x150
[<c0252769>] sock_poll+0x29/0x40
[<c016a079>] do_pollfd+0x89/0x90
[<c016a0ea>] do_poll+0x6a/0xd0
[<c016a296>] sys_poll+0x146/0x230
[<c011edfb>] sys_gettimeofday+0x3b/0x80
[<c0169670>] __pollwait+0x0/0xd0
[<c01096b8>] syscall_call+0x7/0xb

google didnot gives me any useful pointer.

i tried different network card
i recompiled a fresh kernel.
i switch from xen-2.0.4 to xen-2.0.5

i still got this problem.
it doesnot seems to be harmful but i just dont like it.

any ideas ?

regards
--
Thomas Constans
www.opendoor.fr
06 23 37 87 85
04 78 68 17 34

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RE: Badness in local_bh_enable [ In reply to ]

m+Ian.Pratt at cl

Apr 1, 2005, 2:08 AM

Post #2 of 10 (2529 views)

Permalink

> i am not sure if this is related, but i discovered it after installing
> xen: i've got the following message in dmesg:
>
> Badness in local_bh_enable at kernel/softirq.c:140
> [<c011f740>] local_bh_enable+0x80/0x90 [<c02572f9>]
> skb_checksum+0x129/0x2b0 [<c02c7a86>] schedule+0x306/0x530
> [<c029036c>] udp_poll+0x9c/0x150 [<c0252769>]
> sock_poll+0x29/0x40 [<c016a079>] do_pollfd+0x89/0x90
> [<c016a0ea>] do_poll+0x6a/0xd0 [<c016a296>]
> sys_poll+0x146/0x230 [<c011edfb>] sys_gettimeofday+0x3b/0x80
> [<c0169670>] __pollwait+0x0/0xd0 [<c01096b8>] syscall_call+0x7/0xb

I'll wager that you're trying to use modules compiled for a non-Xen
kernel.

> it doesnot seems to be harmful but i just dont like it.

You're living very dangerously.

When building modules outside of the kernel tree make sure you use 'make
ARCH=xen'.

Ian

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RE: Badness in local_bh_enable [ In reply to ]

mlist at opendoor

Apr 1, 2005, 2:21 AM

Post #3 of 10 (2540 views)

Permalink

Le vendredi 01 avril 2005 à 10:08 +0100, Ian Pratt a écrit :
> > i am not sure if this is related, but i discovered it after installing
> > xen: i've got the following message in dmesg:
> >
> > Badness in local_bh_enable at kernel/softirq.c:140
> > [<c011f740>] local_bh_enable+0x80/0x90 [<c02572f9>]
> > skb_checksum+0x129/0x2b0 [<c02c7a86>] schedule+0x306/0x530
> > [<c029036c>] udp_poll+0x9c/0x150 [<c0252769>]
> > sock_poll+0x29/0x40 [<c016a079>] do_pollfd+0x89/0x90
> > [<c016a0ea>] do_poll+0x6a/0xd0 [<c016a296>]
> > sys_poll+0x146/0x230 [<c011edfb>] sys_gettimeofday+0x3b/0x80
> > [<c0169670>] __pollwait+0x0/0xd0 [<c01096b8>] syscall_call+0x7/0xb
>
> I'll wager that you're trying to use modules compiled for a non-Xen
> kernel.
>
> > it doesnot seems to be harmful but i just dont like it.
>
> You're living very dangerously.
>
> When building modules outside of the kernel tree make sure you use 'make
> ARCH=xen'.

thanks for the quick answer.

so what is the proper procedure for building a xen kernel ?

this is what i do, knowing that xen sources are located
in /xen/xen-2.0 :

# cd /xen/xen-2.0/linux-2.6.10-xen0/
# make menuconfig ARCH=xen
...
# cd /xen/xen-2.0/
# make
# ./install.sh

am i missing something ?

regards

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RE: Badness in local_bh_enable [ In reply to ]

m+Ian.Pratt at cl

Apr 1, 2005, 3:41 AM

Post #4 of 10 (2530 views)

Permalink

> > I'll wager that you're trying to use modules compiled for a non-Xen
> > kernel.
> so what is the proper procedure for building a xen kernel ?

Are you sure you're not picking up a module from another kernel build?

> this is what i do, knowing that xen sources are located in
> /xen/xen-2.0 :
>
> # cd /xen/xen-2.0/linux-2.6.10-xen0/
> # make menuconfig ARCH=xen

[.It's normal to use 'make ARCH=xen menuconfig', but I guess the above
works]

> # cd /xen/xen-2.0/
> # make
> # ./install.sh
>
> am i missing something ?

Are you using any 3rd party modules not in the standard tree?

What modifications did you make to the default xen0 config? It's
possible you enabled something that hasn't been tested.

Thanks,
Ian

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Re: Badness in local_bh_enable [ In reply to ]

emptysands at gmail

Apr 1, 2005, 1:54 PM

Post #5 of 10 (2535 views)

Permalink

I had this problem a while back. Went away when I cleaned out all the
modules and compiled them with ARCH=xen.

On Apr 1, 2005 9:21 PM, mlist <mlist@opendoor.fr> wrote:
>
> so what is the proper procedure for building a xen kernel ?
>
> this is what i do, knowing that xen sources are located
> in /xen/xen-2.0 :
>
> # cd /xen/xen-2.0/linux-2.6.10-xen0/
> # make menuconfig ARCH=xen
> ...
> # cd /xen/xen-2.0/
> # make
> # ./install.sh
>
> am i missing something ?

cp -r /lid/modules/::kernel-version::.

For good measure also do a:
mv .config _config; make distclean; mv _config .config; make ARCH=xen oldconfig
before building your kernel.

Nicholas

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Re: Badness in local_bh_enable [ In reply to ]

mlist at opendoor

Apr 5, 2005, 4:11 AM

Post #6 of 10 (2529 views)

Permalink

Le samedi 02 avril 2005 à 08:54 +1200, Nicholas Lee a écrit :
> I had this problem a while back. Went away when I cleaned out all the
> modules and compiled them with ARCH=xen.

i found out that dom0 kernel starts loggins this error when i start one
of my domU

i cleaned the whole build tree, erased lib/modules on client, but i
still got this error.

i recompiled client kernel by doing "make" in xen source tree, after rm
-fr linux-2.6.10-xenU

so i dont know what i am missing here

any idea ?

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RE: Badness in local_bh_enable [ In reply to ]

m+Ian.Pratt at cl

Apr 5, 2005, 4:42 AM

Post #7 of 10 (2529 views)

Permalink

> Le samedi 02 avril 2005 à 08:54 +1200, Nicholas Lee a écrit :
> > I had this problem a while back. Went away when I cleaned
> out all the
> > modules and compiled them with ARCH=xen.
>
> i found out that dom0 kernel starts loggins this error when i
> start one of my domU
>
> i cleaned the whole build tree, erased lib/modules on client,
> but i still got this error.

It's possible that the out-of-tree modules you are building are not respecting the ARCH=xen target.

I'll bet if you run them through objdump -d you'll find 'cli' instructions.

Ian

> i recompiled client kernel by doing "make" in xen source
> tree, after rm -fr linux-2.6.10-xenU
>
> so i dont know what i am missing here
>
> any idea ?
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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RE: Badness in local_bh_enable [ In reply to ]

m+Ian.Pratt at cl

Apr 7, 2005, 9:03 AM

Post #8 of 10 (2532 views)

Permalink

> i put back all xen hosts in same subnet as dom0, so there is
> no more multiple virtual nics | routing involved, and the
> problems disapeared.
>
> i soon i as i can get some spare time, i'll investigate this further

I'll be really interested to hear what's going on here. I know of a
number of people that use multiple NICs and I haven't heard of such
reports before.

Thanks,
Ian

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RE: Badness in local_bh_enable [ In reply to ]

mlist at opendoor

Apr 7, 2005, 11:24 PM

Post #9 of 10 (2530 views)

Permalink

Le jeudi 07 avril 2005 à 17:03 +0100, Ian Pratt a écrit :
> I'll be really interested to hear what's going on here. I know of a
> number of people that use multiple NICs and I haven't heard of such
> reports before.

i am planning to do some thorough testing next week.

cheers

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RE: Badness in local_bh_enable [ In reply to ]

mlist at opendoor

Apr 27, 2005, 1:16 AM

Post #10 of 10 (2525 views)

Permalink

Le vendredi 08 avril 2005 à 08:24 +0200, mlist a écrit :
> Le jeudi 07 avril 2005 à 17:03 +0100, Ian Pratt a écrit :
> > I'll be really interested to hear what's going on here. I know of a
> > number of people that use multiple NICs and I haven't heard of such
> > reports before.
>
> i am planning to do some thorough testing next week.

i have unfortunately not been able to pinpoint the causes of the
problem.

i either suspect some kind of hardware issue and|or kernel options.

i have finally given up and switch all xen domains on an other machines
where they are happily serving us dns, groupware, database, web and ldap
services

keep up the great work

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