RHEL6.4 nfsd periodically becomes blocked for 120 seconds, triggers hung task warnings
Issue
- nfsd locks up on RHEL 6.4 with the following backtrace:
INFO: task nfsd:43340 blocked for more than 240 seconds.
Tainted: P --------------- 2.6.32-431.20.3.el6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
nfsd D 0000000000000005 0 43340 2 0x00000080
ffff880310a91c40 0000000000000046 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
ffff88082deff058 ffff880310a91fd8 000000000000fbc8 ffff88082deff058
Call Trace:
[<ffffffff81529f9e>] __mutex_lock_slowpath+0x13e/0x180
[<ffffffff81529e3b>] mutex_lock+0x2b/0x50
[<ffffffffa067b15d>] nfsd_lookup_dentry+0xdd/0x500 [nfsd]
[<ffffffffa067b5b3>] nfsd_lookup+0x33/0xd0 [nfsd]
[<ffffffffa0684282>] nfsd3_proc_lookup+0x92/0xf0 [nfsd]
[<ffffffffa0675425>] nfsd_dispatch+0xe5/0x230 [nfsd]
[<ffffffffa0642844>] svc_process_common+0x344/0x640 [sunrpc]
[<ffffffff81061d00>] ? default_wake_function+0x0/0x20
[<ffffffffa0642e80>] svc_process+0x110/0x160 [sunrpc]
[<ffffffffa0675b52>] nfsd+0xc2/0x160 [nfsd]
[<ffffffffa0675a90>] ? nfsd+0x0/0x160 [nfsd]
[<ffffffff8109abf6>] kthread+0x96/0xa0
[<ffffffff8100c20a>] child_rip+0xa/0x20
[<ffffffff8109ab60>] ? kthread+0x0/0xa0
[<ffffffff8100c200>] ? child_rip+0x0/0x20
Environment
- Red Hat Enterprise Linux 6.4 (NFS server)
- kernel 2.6.32-358.14.1.el6.x86_64
- ZFS/SPL kernel modules
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Close
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.