linux-kernel - rcu_kthread hang on 3.0.0-rc1-next-20110602

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Date:	Sat, 4 Jun 2011 00:43:25 +0300
From:	Markus Hästbacka <mhastbacka@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: rcu_kthread hang on 3.0.0-rc1-next-20110602

Hello!

After updating my debian squeeze box to 3.0.0-rc1-next-20110602 I'm experiencing a weird problem. If I run dmesg  the computer hangs for 15 minutes, and I cannot even login at this time, if I leave top (the top window updates very slowly, like every 5 minutes during this period) running I can see that the process rcu_kthread takes 100% CPU, the computer load average is at around 10.

I also sometimes get these disk errors in syslog:
Jun  4 02:01:39 midi3g kernel: ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Jun  4 02:01:39 midi3g kernel: ata1.01: BMDMA stat 0x44
Jun  4 02:01:39 midi3g kernel: ata1.01: failed command: WRITE DMA
Jun  4 02:01:39 midi3g kernel: ata1.01: cmd ca/00:00:1c:7b:c6/00:00:00:00:00/f0 tag 0 dma 131072 out
Jun  4 02:01:39 midi3g kernel:         res 51/84:00:fe:7b:c6/00:00:00:00:00/f0 Emask 0x10 (ATA bus error)
Jun  4 02:01:39 midi3g kernel: ata1.01: status: { DRDY ERR }
Jun  4 02:01:39 midi3g kernel: ata1.01: error: { ICRC ABRT }
Jun  4 02:01:39 midi3g kernel: ata1: soft resetting link
Jun  4 02:01:39 midi3g kernel: ata1.01: configured for UDMA/66
Jun  4 02:01:39 midi3g kernel: ata1: EH complete

but for example the last time I got the hang, I didn't get this error, nor any other error for that matter.

The OS is installed on a CF-card. The computer is a eBox computer with VIA Nehemiah CPU, 256MB RAM.

what more information do you need? Or what more can I test?

M

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