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[Linux-cluster] files with unknown state - locking problem?



Hi, we have a 6 node cluster with FC4, kernel 2.6.16 and the CVS STABLE branch of the cluster software. Sometimes, some processes (courier imap) hangs in D state. When I execute "ls -la" in the "tmp" directory (the directory is always the same, the same mailbox) of the mailbox that it's triyng to access the process, the answer is really slow and this is the output:

?--------- ? ? ? ? ? 1151074448.M345358P6861_courierlock.qmail-be-04 ?--------- ? ? ? ? ? 1151074497.M326691P7647_courierlock.qmail-be-04 ?--------- ? ? ? ? ? 1151074534.M524707P2198_courierlock.qmail-be-05 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:07 1151074538.M785749P13408_courierlock.qmail-be-03 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:09 1151074588.M917441P3132_courierlock.qmail-be-05 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:09 1151074593.M62901P3189_courierlock.qmail-be-05 ?--------- ? ? ? ? ? 1151074649.M845223P5214_courierlock.qmail-be-02 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:09 1151074656.M448306P28724_courierlock.qmail-be-06 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:07 1151074657.M188653P5302_courierlock.qmail-be-02 ?--------- ? ? ? ? ? 1151074679.M821433P4979_courierlock.qmail-be-05 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:07 1151074690.M360083P5741_courierlock.qmail-be-02 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:07 1151074701.M709923P29422_courierlock.qmail-be-06 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:07 1151074716.M544858P6016_courierlock.qmail-be-02 -rw-r--r-- 1 mailuser mailuser 16 Jun 23 12:07 1151074731.M21587P6179_courierlock.qmail-be-02 ?--------- ? ? ? ? ? 1151074804.M241436P7410_courierlock.qmail-be-02 ?--------- ? ? ? ? ? 1151074831.M678238P17302_courierlock.qmail-be-03 ?--------- ? ? ? ? ? 1151074917.M42708P8494_courierlock.qmail-be-05 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:08 1151074918.M541477P14716_courierlock.qmail-be-04 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:08 1151074946.M520653P15248_courierlock.qmail-be-04 ?--------- ? ? ? ? ? 1151075037.M234721P11020_courierlock.qmail-be-02 ?--------- ? ? ? ? ? 1151075065.M951224P8598_courierlock.qmail-be-01 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:09 1151075082.M788480P11712_courierlock.qmail-be-02 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:09 1151075186.M911867P18565_courierlock.qmail-be-04 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:08 1151075210.M366861P13891_courierlock.qmail-be-02 -rw-r--r-- 1 mailuser mailuser 17 Jun 23 12:09 1151075217.M850817P13366_courierlock.qmail-be-05 ?--------- ? ? ? ? ? 1151075252.M599978P32483_imapuid_4.qmail-be-05

It seems like a lock problem, but not sure. Is there any other tool that I can use to debug this?
Thanks
German


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