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[Xen-devel] Xen 4.1 + 3ware 9690SA = rejecting I/O to offline device

To: xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Xen 4.1 + 3ware 9690SA = rejecting I/O to offline device
From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
Date: Mon, 11 Oct 2010 17:44:56 -0400
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In an effort to fix the problem described in my previous xen-devel post ("New CPUS, now get: NETDEV WATCHDOG: eth0: transmit timed out"), we've come across another problem. 3ware 9690SA cards to not behave under Xen 4.1 (as of cs 22155).

We have a simple Xen thrash test suite which fires up domUs that do different workloads (some swap thrash, some kernel build, some spin CPUs, some cycle rebooting, etc). Almost immediately after launching the suite we can get the 3ware 9690SA card to fail with something like the following:

sd 0:0:0:0: WARNING: (0x06:0x002C): Command (0x28) timed out, resetting card.
sd 0:0:0:0: WARNING: (0x06:0x002C): Command (0x0) timed out, resetting card.
sd 0:0:0:0: rejecting I/O to offline device
sd 0:0:0:0: rejecting I/O to offline device

Under a 2.6.32 dom0 it sometimes also triggers Xenwatch like so:

http://theshore.net/~caker/xen/BUGS/9690SA/xenwatch.txt

Results matrix:

+---------------------------------------------------------------+
| Xen           | Dom0                | 9550SXU | 9690SA | 9750 |
+---------------------------------------------------------------+
| 3.4.1         | 2.6.18.8-931-2      | OK      | OK     | OK   |
| 3.4.4-rc1-pre | 2.6.18.8-931-2      | OK      | OK     | OK   |
| 3.4.4-rc1-pre | 2.6.32.23-g41a85de5 | OK      | OK     | OK   |
| 4.1 @ 22155   | 2.6.18.8-931-2      | OK      | FAIL   | OK   |
| 4.1 @ 22155   | 2.6.32.23-g41a85de5 | OK      | FAIL   | OK   |
+---------------------------------------------------------------+

The failures were verified on at least 2 machines of identical specification.

The same dom0 kernels that produce a stable 9690SA under Xen 3.4, bomb under Xen 4.1.

-Chris

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