Re: PROBLEM: modprobe hang at startup (3.8.x, 3.9.x, IBM x3550)

From: Robert Norris
Date: Tue May 14 2013 - 19:16:41 EST

On Mon, May 13, 2013 at 11:22:32AM +1000, Robert Norris wrote:
> We have a number of Intel x3550 servers (Intel 5000-series). They've
> been running 3.7.2 fine.
> In the last week I've run 3.8.11, 3.8.12 and 3.9.2 on them. All have
> long hangs at boot, and later hung tasks in modprobe.

I bisected this and tracked it to this commit:

commit 6676a847d48ac48908cf467b42da9045b5463a6e
Author: Jean Delvare <khali@xxxxxxxxxxxx>
Date: Sun Dec 16 21:11:55 2012 +0100

i2c-i801: Enable interrupts for all post-ICH5 chips

I did not receive a single bug report after interrupt support was
added for a limited number of chips. So I'd say the code is good and
should be enabled for all supported chips, that is: ICH5 and later.

Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Reviewed-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>

I've tested by building 3.9.2 with that single commit reverted, and it
boots without issue.

According to lspci I have:

00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus Controller (rev 09)

Which has PCI ID 0x269b (ie PCI_DEVICE_ID_INTEL_ESB2_17).

For now I will either revert this commit in my kernel builds or
blacklist the module on these machines (I haven't decided which I prefer

Obviously, I can reproduce this reliably, and am happy to test.

Rob N.
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