On 07/12/2010 10:52 AM, Ian Stakenvicius, Aerobiology Research wrote: > On 11/07/10 12:57 PM, Nikolaus Rath wrote: >> Hello, >> >> I have set up diskless fat clients with kernel 2.6.32. The root filesystem >> is aufs. Underlying the aufs is an rw tmpfs and a ro squashfs, the later >> mounted from NBD. >> >> The problems is that the fat clients work fine for a little while, but then >> reproducibly freeze completely within a few hours after booting. [ Snip! ] >> These messages come for different tasks (not just cron) and to me the call >> traces look identical (but I can also attach a full set of log messages). >> >> >> Anyone able to help? >> >> > I can't help much, but I believe this may be the same bug that I've been > dealing with. I'm using a read-only NFS-root instead of a squashfs, and > my rw overlays are tmpfs, though. My systems are headless > high-performance cluster nodes, but are probably not much different from > your fat clients.
I had problems similar to that in the past, see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/521069. However, I was able to "fix" them by using squashfs instead of NFS.. until recently, when I started to get similar problems with squashfs. > On my systems it's not a complete lockout, though; it seems to just be a > lockout on file I/O (if a processess is loaded/running and it doesn't > do any file I/O -- like 'top' -- then there's no problem) -- is this the > same for your issue? I think my system is frozen completely, I can't ssh and I can't log into the console. > If you take a look at your syslog, I bet you will see at least one > additional hung task, that being an aufsd process. There are lots of other tasks here, but aufsd is not among them. Best, -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first
