[LU-5333] rm cause MDS to complain hung tasks and disconnecting clients

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Affects Version/s: Lustre 2.4.3
• Labels: sdsc
• Environment: Linux puma-mds-10-6.local 2.6.32-358.23.2.el6_lustre.x86_64 #1 SMP Thu Dec 19 19:57:45 PST 2013 x86_64 x86_64 x86_64 GNU/Linux
• Severity: 2
• Assignee: Niu Yawei (Inactive)
• Reporter: Haisong Cai (Inactive)

Description

A client was running "rm" to remove a couple of million files when MDS system load shot to 30 and kernel trace dumping complaining hung tasks - See attached output from "dmesg"

I would think this is normal workload for a duo-westmere CPU / 24GB RAM bonded myricom 10Gbps system.

We have been seeing happening more frequently in 2.4.3 than when we were at 1.8.7.

Anything suggestion?

thanks,
Haisong

Issue Links

• is related to: LU-5726 MDS buffer not freed when deleting files
• is related to: LU-5503 MDS (2.4.2) are getting "Service thread ... inactive" and file-system times out