dentry with DCACHE_SHRINKING set but no task shrinking dcache in Red Hat Enterprise Linux 6

Solution In Progress - Updated -

Issue

  • nfsd hung with following call trace:
Jan 24 15:54:14 localhost kernel: INFO: task nfsd:2517 blocked for more than 120 seconds.
Jan 24 15:54:14 localhost kernel:      Not tainted 2.6.32-754.2.1.el6.x86_64 #1
Jan 24 15:54:14 localhost kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 24 15:54:14 localhost kernel: nfsd          D 0000000000000009     0  2517      2 0x00000080
Jan 24 15:54:14 localhost kernel: ffff880628917c60 0000000000000046 ffff88062d8da480 0000000000000004
Jan 24 15:54:14 localhost kernel: ffff880628917bf0 ffffffffa049ca36 ffff88062d8da480 0000000000000001
Jan 24 15:54:14 localhost kernel: ffff880100a1c680 0000000000000003 ffff88062c77b068 ffff880628917fd8
Jan 24 15:54:14 localhost kernel: Call Trace:
Jan 24 15:54:14 localhost kernel: [<ffffffffa049ca36>] ? nfsd_setuser+0x126/0x2c0 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffff81241515>] ? security_inode_permission+0x25/0x30
Jan 24 15:54:14 localhost kernel: [<ffffffff81556536>] __mutex_lock_slowpath+0x96/0x210
Jan 24 15:54:14 localhost kernel: [<ffffffff81555dbb>] mutex_lock+0x2b/0x50
Jan 24 15:54:14 localhost kernel: [<ffffffffa0498fa4>] nfsd_unlink+0xc4/0x250 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa04a5702>] nfsd4_remove+0x52/0x140 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa04a65f8>] ? nfsd4_encode_operation+0x78/0x180 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa04a44c5>] nfsd4_proc_compound+0x3e5/0x4b0 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa049141a>] nfsd_dispatch+0xfa/0x2c0 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa036705c>] svc_process_common+0x34c/0x660 [sunrpc]
Jan 24 15:54:14 localhost kernel: [<ffffffff8106fe10>] ? default_wake_function+0x0/0x20
Jan 24 15:54:14 localhost kernel: [<ffffffffa0367710>] svc_process+0x110/0x160 [sunrpc]
Jan 24 15:54:14 localhost kernel: [<ffffffffa0491d12>] nfsd+0xc2/0x160 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffffa0491c50>] ? nfsd+0x0/0x160 [nfsd]
Jan 24 15:54:14 localhost kernel: [<ffffffff810a9a30>] kthread+0xa0/0xc0
Jan 24 15:54:14 localhost kernel: [<ffffffff815617d0>] child_rip+0x20/0x30
Jan 24 15:54:14 localhost kernel: [<ffffffff810a9990>] ? kthread+0x0/0xc0
Jan 24 15:54:14 localhost kernel: [<ffffffff815617b0>] ? child_rip+0x0/0x30

Environment

  • Red Hat Enterprise Linux 6

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