RHEL6: Getting "WARNING: at net/sunrpc/sched.c:621 rpc_exit_task+0x5c/0x60 [sunrpc]() (Not tainted)"

Issue

• System was facing some NFS issues. Found following logs in messages file.

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WARNING: at net/sunrpc/sched.c:621 rpc_exit_task+0x5c/0x60 [sunrpc]() (Not tainted)
Hardware name: N20-B6625-1
Modules linked in: nfsd exportfs sr_mod cdrom usb_storage autofs4 nfs lockd fscache nfs_acl auth_rpcgss sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bonding 8021q garp stp llc ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr power_meter microcode sg i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support ioatdma dca i7core_edac edac_core shpchp ext4 mbcache jbd2 dm_round_robin sd_mod crc_t10dif crc32c_intel enic mptsas mptscsih mptbase scsi_transport_sas dm_multipath dm_mirror dm_region_hash dm_log dm_mod iscsi_tcp iscsi_ibft be2iscsi bnx2i cnic uio ipv6 cxgb4i cxgb4 cxgb3i libcxgbi cxgb3 mdio libiscsi_tcp qla4xxx iscsi_boot_sysfs libiscsi scsi_transport_iscsi [last unloaded: scsi_wait_scan]
Pid: 3259, comm: rpciod/14 Not tainted 2.6.32-279.9.1.el6.x86_64 #1
Call Trace:
[<ffffffff8106b797>] ? warn_slowpath_common+0x87/0xc0
[<ffffffffa03f33a0>] ? rpc_exit_task+0x0/0x60 [sunrpc]
[<ffffffff8106b7ea>] ? warn_slowpath_null+0x1a/0x20
[<ffffffffa03f33fc>] ? rpc_exit_task+0x5c/0x60 [sunrpc]
[<ffffffffa03f3e37>] ? __rpc_execute+0x77/0x350 [sunrpc]
[<ffffffffa03f41b0>] ? rpc_async_schedule+0x0/0x20 [sunrpc]
[<ffffffffa03f41c5>] ? rpc_async_schedule+0x15/0x20 [sunrpc]
[<ffffffff8108c7e0>] ? worker_thread+0x170/0x2a0
[<ffffffff81092150>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8108c670>] ? worker_thread+0x0/0x2a0
[<ffffffff81091de6>] ? kthread+0x96/0xa0
[<ffffffff8100c14a>] ? child_rip+0xa/0x20
[<ffffffff81091d50>] ? kthread+0x0/0xa0
[<ffffffff8100c140>] ? child_rip+0x0/0x20
---[ end trace 6887fca8b99f5bd9 ]---