Server crash with nfs_wait_bit_uninterruptible in Red Hat Enterprise Linux 5

Issue

System crashed with these errors:-->

Jun  9 18:32:34 stalapp0084 kernel: INFO: task netprobe.linux:1087 blocked for more than 120 seconds.
Jun  9 18:32:34 stalapp0084 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun  9 18:32:34 stalapp0084 kernel: netprobe.linu D ffffffff80150939     0  1087      1 18576    1086   658 (NOTLB)
Jun  9 18:32:34 stalapp0084 kernel:  ffff812033771ce8 0000000000000086 ffff813fee4eba88 ffff81403c65cc00
Jun  9 18:32:34 stalapp0084 kernel:  0000000000000286 0000000000000007 ffff81203cd0b820 ffff81403fc94860
Jun  9 18:32:34 stalapp0084 kernel:  0002dcbb4956c406 0000000000019cca ffff81203cd0ba08 0000001f00000286
Jun  9 18:32:34 stalapp0084 kernel: Call Trace:
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff8006e1d7>] do_gettimeofday+0x40/0x90
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88dea86d>] :nfs:nfs_wait_bit_uninterruptible+0x0/0xd
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff800637ea>] io_schedule+0x3f/0x67
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88dea876>] :nfs:nfs_wait_bit_uninterruptible+0x9/0xd
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff80063a16>] __wait_on_bit+0x40/0x6e
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff80098a0d>] recalc_sigpending+0xe/0x25
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88dea86d>] :nfs:nfs_wait_bit_uninterruptible+0x0/0xd
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff80063ab0>] out_of_line_wait_on_bit+0x6c/0x78
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff800a0b8d>] wake_bit_function+0x0/0x23
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88dee2f2>] :nfs:nfs_wait_on_requests_locked+0x70/0xca
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88def34c>] :nfs:nfs_sync_inode_wait+0x60/0x1db
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff88de7bee>] :nfs:nfs_getattr+0x56/0xda
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff80022133>] vfs_fstat+0x29/0x3a
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff80083ef1>] sys32_fstat64+0x11/0x29
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff8006153d>] sysenter_tracesys+0x48/0x83
Jun  9 18:32:34 stalapp0084 kernel:  [<ffffffff8006149d>] sysenter_do_call+0x1e/0x76