From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 47701] When too many disks fall out at the same time, RCU hangs
Date: Sat, 6 Oct 2012 14:30:58 +0000 (UTC)
Message-ID: <20121006143058.BACAA11FC6C@bugzilla.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=47701
--- Comment #1 from Brad Campbell 2012-10-06 14:30:58 ---
Created an attachment (id=82531)
--> (https://bugzilla.kernel.org/attachment.cgi?id=82531)
dmesg of boot, and removal of one drive at 9462 seconds.
I can reproduce this on 3.5.5 & 3.6.
I have 2 of these cards : 01:00.0 Serial Attached SCSI controller: LSI Logic /
Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02)
My test setup places only 2 drives on the SAS cards. I create a RAID10 from
them. Simply pulling a drive will cause the following RCU hang, and prevent the
machine from syncing, rebooting or being able to use the array. Alt-sysrq gets
me rebooted and back up and running. 100% reproducible.
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