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Date: Tue, 9 Nov 2010 00:06:36 -0500 From: Luke Hutchison <luke.hutch@...il.com> To: linux-kernel@...r.kernel.org Subject: "BUG: soft lockup - CPU#0 stuck for 61s! [kswapd0:184]" Hi, I just wanted to report a bug upstream that is affecting the latest versions of at least both Fedora and Ubuntu. CPUs somehow lock up under load, producing errors of the form "BUG: soft lockup - CPU#0 stuck for 61s! [kswapd0:184]" The Fedora Bug report is here: https://bugzilla.redhat.com/show_bug.cgi?id=649694 -- however you can find lots of references to the error message on other distributions (including Ubuntu) by googling "bug soft lockup cpu stuck". Lockups seem to happen on server-class hardware under heavy loads when the machine is swapping. This can lead to the entire machine locking up in some reported cases (although so far only individual CPUs seem to have locked up in my case, not the entire machine). The point at which the CPU hangs varies -- see the dmesg output I attached to the Fedora bug report above. My machine is a 12-way Xeon X5680 system with ext3, AFS and XFS filesystems (XFS is running on hardware RAID). Please let me know if you need other info that would be helpful to diagnosing the problem. Thank you, Luke Hutchison -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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