netdev - Re: Bug#577640: linux-image-2.6.33-2-amd64: Kernel warnings in netns thread

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Date:	Sun, 18 Apr 2010 18:33:25 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Martin Ferrari <martin.ferrari@...il.com>, 577640@...s.debian.org
Cc:	netdev <netdev@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: Bug#577640: linux-image-2.6.33-2-amd64: Kernel warnings in
 netns thread

On Tue, 2010-04-13 at 13:20 +0200, Martin Ferrari wrote:
> Package: linux-2.6
> Version: 2.6.33-1~experimental.4
> Severity: normal
> Tags: experimental
> 
> Firstly, please note that I'm running this inside a Qemu, but I
> imagine that it should not change things much.
> 
> I installed 2.6.33 to try out the new improvements regarding network
> namespaces, and while creating and killing hundreds of them, I got
> many warnings from the kernel that might indicate a bug somewhere.
> Please see the log already included by reportbug.

I'm forwarding this to the upstream maintainers.

Ben.

[...]
> [ 6696.035331] ------------[ cut here ]------------
> [ 6696.035334] WARNING: at /build/mattems-linux-2.6_2.6.33-1~experimental.4-amd64-ieqSsa/linux-2.6-2.6.33-1~experimental.4/debian/build/source_amd64_none/kernel/sysctl.c:1894 unregister_sysctl_table+0xa6/0xd1()
> [ 6696.035336] Hardware name: 
> [ 6696.035337] Modules linked in: veth loop parport_pc parport snd_pcm tpm_tis evdev snd_timer i2c_piix4 tpm tpm_bios button processor serio_raw i2c_core snd soundcore snd_page_alloc pcspkr psmouse ext3 jbd mbcache sg sr_mod cdrom sd_mod crc_t10dif ata_generic ata_piix libata floppy 8139cp thermal thermal_sys 8139too mii scsi_mod [last unloaded: veth]
> [ 6696.035354] Pid: 9, comm: netns Tainted: G        W  2.6.33-2-amd64 #1
> [ 6696.035355] Call Trace:
> [ 6696.035357]  [<ffffffff8104e303>] ? unregister_sysctl_table+0xa6/0xd1
> [ 6696.035360]  [<ffffffff8104e303>] ? unregister_sysctl_table+0xa6/0xd1
> [ 6696.035362]  [<ffffffff81046b81>] ? warn_slowpath_common+0x77/0xa3
> [ 6696.035364]  [<ffffffff8104e303>] ? unregister_sysctl_table+0xa6/0xd1
> [ 6696.035367]  [<ffffffff812b1205>] ? addrconf_ifdown+0x26f/0x2cc
> [ 6696.035369]  [<ffffffff81247edc>] ? neigh_sysctl_unregister+0x1a/0x31
> [ 6696.035371]  [<ffffffff812b1211>] ? addrconf_ifdown+0x27b/0x2cc
> [ 6696.035374]  [<ffffffff812b2b0c>] ? addrconf_notify+0x714/0x7ea
> [ 6696.035376]  [<ffffffff811eb2e7>] ? extract_entropy+0x6a/0x125
> [ 6696.035379]  [<ffffffff81053aaf>] ? lock_timer_base+0x26/0x4b
> [ 6696.035382]  [<ffffffff8123951c>] ? skb_dequeue+0x50/0x58
> [ 6696.035384]  [<ffffffff812482c8>] ? pneigh_queue_purge+0x25/0x2f
> [ 6696.035386]  [<ffffffff81249a91>] ? neigh_ifdown+0xba/0xc9
> [ 6696.035389]  [<ffffffff81062f6d>] ? notifier_call_chain+0x29/0x4c
> [ 6696.035392]  [<ffffffff81243662>] ? rollback_registered_many+0xed/0x19c
> [ 6696.035394]  [<ffffffff8124371f>] ? unregister_netdevice_many+0xe/0x57
> [ 6696.035397]  [<ffffffff812438a3>] ? default_device_exit_batch+0x92/0xa3
> [ 6696.035399]  [<ffffffff8123e97a>] ? cleanup_net+0xfd/0x1af
> [ 6696.035402]  [<ffffffff8105bd0d>] ? worker_thread+0x188/0x21d
> [ 6696.035404]  [<ffffffff8123e87d>] ? cleanup_net+0x0/0x1af
> [ 6696.035406]  [<ffffffff8105f2d2>] ? autoremove_wake_function+0x0/0x2e
> [ 6696.035409]  [<ffffffff8105bb85>] ? worker_thread+0x0/0x21d
> [ 6696.035411]  [<ffffffff8105ee99>] ? kthread+0x79/0x81
> [ 6696.035414]  [<ffffffff810098e4>] ? kernel_thread_helper+0x4/0x10
> [ 6696.035416]  [<ffffffff8105ee20>] ? kthread+0x0/0x81
> [ 6696.035418]  [<ffffffff810098e0>] ? kernel_thread_helper+0x0/0x10
> [ 6696.035419] ---[ end trace ef7b93cb006e989e ]---
[...]

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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