Extremely slow response from the server, can't login.

Issue

• Extremely slow response from the server, can't login.
• Logs have hung_task_timeout_secs messages

INFO: task java:16215 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
java          D 0000000000000000     0 16215      1 0x00020080
 ffff8803a9ce99c8 0000000000000086 0000000501000286 ffffc90001817058
 ffffc90001817020 ffffea0000d50f90 ffff8803f1e320c0 000000d000047b40
 ffff8803f1e32678 ffff8803a9ce9fd8 000000000000f4e8 ffff8803f1e32678
Call Trace:
 [<ffffffff8109b6a9>] ? ktime_get_ts+0xa9/0xe0
 [<ffffffffa02bcb60>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
 [<ffffffff814ed293>] io_schedule+0x73/0xc0
 [<ffffffffa02bcb6e>] nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
 [<ffffffff814edc4f>] __wait_on_bit+0x5f/0x90
 [<ffffffffa02bcb60>] ? nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
 [<ffffffff814edcf8>] out_of_line_wait_on_bit+0x78/0x90
 [<ffffffff81090ad0>] ? wake_bit_function+0x0/0x50
 [<ffffffff811108ce>] ? find_get_page+0x1e/0xa0
 [<ffffffffa02bcb4f>] nfs_wait_on_request+0x2f/0x40 [nfs]
 [<ffffffffa02c349e>] nfs_updatepage+0x28e/0x590 [nfs]
 [<ffffffffa02b1512>] nfs_write_end+0x152/0x2b0 [nfs]
 [<ffffffff81110292>] ? iov_iter_copy_from_user_atomic+0x92/0x130
 [<ffffffff81111424>] generic_file_buffered_write+0x174/0x2a0
 [<ffffffff81112d10>] __generic_file_aio_write+0x250/0x480
 [<ffffffff81112faf>] generic_file_aio_write+0x6f/0xe0
 [<ffffffffa02b0f4e>] nfs_file_write+0xde/0x1f0 [nfs]
 [<ffffffff8117628a>] do_sync_write+0xfa/0x140
 [<ffffffff81090a90>] ? autoremove_wake_function+0x0/0x40
 [<ffffffff81218e3b>] ? selinux_file_permission+0xfb/0x150
 [<ffffffff8120c1e6>] ? security_file_permission+0x16/0x20
 [<ffffffff81176588>] vfs_write+0xb8/0x1a0
 [<ffffffff81176f91>] sys_write+0x51/0x90
 [<ffffffff81048f20>] sysenter_dispatch+0x7/0x2e