linux-kernel - 2.6.31.2 problems with net/core/skbuff.c

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Message-ID: <4ACDFC82.1080007@navynet.it>
Date:	Thu, 08 Oct 2009 16:51:46 +0200
From:	Massimo Cetra <mcetra@...ynet.it>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.31.2 problems with net/core/skbuff.c

Hello all,

i upgraded my servers to 2.6.31.2 a couple of days ago to fix a problem
with OCFS2 locking here and there.

The kernel is a plain vanilla plus with the addition of linux-vserver
patches.
An additional module is DRBD 8.3.4 (latest release).

I'm having serveral stability problems like the following one:

Oct  8 11:16:52 172.30.1.31 [113074.738027] hrtimer: interrupt too slow,
forcing clock min delta to 492510645 ns
Oct  8 11:16:52 172.30.1.31 [113074.791813] ------------[ cut here
]------------
Oct  8 11:16:52 172.30.1.31 [113074.791813] WARNING: at
net/core/skbuff.c:398 skb_release_head_state+0x64/0xc8()
Oct  8 11:16:52 172.30.1.31 [113074.791813] Hardware name:
Oct  8 11:16:52 172.30.1.31 [113074.791813] Modules linked in:
netconsole ocfs2 jbd2 quota_tree ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm
ocfs2_nodemanager ocfs2_stackglue configfs crc32c drbd cn loop serio_raw
psmouse snd_pcm snd_timer snd soundcore snd_page_alloc virtio_net pcspkr
parport_pc parport i2c_piix4 i2c_core button processor evdev ext3 jbd
mbcache dm_mirror dm_region_hash dm_log dm_snapshot dm_mod ide_cd_mod
cdrom ata_generic ata_piix virtio_blk libata scsi_mod piix
ide_pci_generic ide_core virtio_pci virtio_ring virtio floppy thermal
fan thermal_sys [last unloaded: netconsole]
Oct  8 11:16:52 172.30.1.31 [113074.791813] Pid: 11132, comm: php5-cgi
Tainted: G        W  2.6.31.2-vserver #1
Oct  8 11:16:52 172.30.1.31 [113074.791813] Call Trace:
Oct  8 11:16:52 172.30.1.31 [113074.791813] <IRQ>  [<ffffffff81253cd5>]
? skb_release_head_state+0x64/0xc8
Oct  8 11:16:52 172.30.1.31 [113074.791813] [<ffffffff81253cd5>] ?
skb_release_head_state+0x64/0xc8
Oct  8 11:16:52 172.30.1.31 [113074.791813] [<ffffffff81049ae1>] ?
warn_slowpath_common+0x77/0xa3

(you can find the whole log in attached).

The machines looses network connectivity.

#uname -a
Linux www1 2.6.31.2-vserver #1 SMP PREEMPT Tue Oct 6 17:12:32 UTC 2009
x86_64 GNU/Linux

I also have to mention that the server runs on top of a dual socket Xeon
E5504 with KVM.

I'm attaching the kernel config, the oops (grabbed through netconsole)
and the dmesg.

Any hint (or any information that i must add) ?

Thanks,
Massimo





View attachment "config-2.6.31.2-vserver.txt" of type "text/plain" (91180 bytes)

View attachment "oops.txt" of type "text/plain" (159578 bytes)

View attachment "dmesg" of type "text/plain" (22785 bytes)