RHEL 6.5 server hangs because of 'vxfs' module.

Issue

• RHEL 6.5 server hangs because of 'vxfs' module with following call traces:

crash> bt
PID: 2534   TASK: ffff881025a6aae0  CPU: 9   COMMAND: "flush-199:25002"
 #0 [ffff880f9d313770] schedule at ffffffff81527ee2
 #1 [ffff880f9d313838] io_schedule at ffffffff815286c3
 #2 [ffff880f9d313858] sync_page at ffffffff8111f95d
 #3 [ffff880f9d313868] __wait_on_bit at ffffffff8152918f
 #4 [ffff880f9d3138b8] wait_on_page_bit at ffffffff8111fb93
 #5 [ffff880f9d313918] vx_pvn_wait_writeback at ffffffffa049b63f [vxfs]
 #6 [ffff880f9d313978] vx_pvn_range_dirty at ffffffffa04a18b4 [vxfs]
 #7 [ffff880f9d313a98] vx_putpage_dirty_wbc at ffffffffa04a1c56 [vxfs]
 #8 [ffff880f9d313af8] vx_do_putpage_wbc at ffffffffa04a1d68 [vxfs]
 #9 [ffff880f9d313b28] vx_putpage1 at ffffffffa0476955 [vxfs]
#10 [ffff880f9d313b88] vx_writepages at ffffffffa0455ec5 [vxfs]
#11 [ffff880f9d313c28] do_writepages at ffffffff81134ca1
#12 [ffff880f9d313c38] writeback_single_inode at ffffffff811b50cd
#13 [ffff880f9d313c78] writeback_sb_inodes at ffffffff811b54cd
#14 [ffff880f9d313cd8] wb_writeback at ffffffff811b58a4
#15 [ffff880f9d313dd8] wb_do_writeback at ffffffff811b5bfb
#16 [ffff880f9d313e68] bdi_writeback_task at ffffffff811b5de3
#17 [ffff880f9d313eb8] bdi_start_fn at ffffffff81143a26
#18 [ffff880f9d313ee8] kthread at ffffffff8109aee6
#19 [ffff880f9d313f48] kernel_thread at ffffffff8100c20a