Comment 26 for bug 1574814

@Radha If you are still seeing this bug, can you attach a console log?

Here's the commit that was added in xenial to address this:

commit 51b7d7350e526bde77f458fb23481e7c5d312d91
Author: David Daney <email address hidden>
Date: Tue May 24 12:55:54 2016 +0800

    UBUNTU: SAUCE: tty: vt: Fix soft lockup in fbcon cursor blink timer.

    BugLink: http://bugs.launchpad.net/bugs/1574814

    We are getting somewhat random soft lockups with this signature:

    [ 86.992215] [<fffffc00080935e0>] el1_irq+0xa0/0x10c
    [ 86.997082] [<fffffc000841822c>] cursor_timer_handler+0x30/0x54
    [ 87.002991] [<fffffc000810ec44>] call_timer_fn+0x54/0x1a8
    [ 87.008378] [<fffffc000810ef88>] run_timer_softirq+0x1c4/0x2bc
    [ 87.014200] [<fffffc000809077c>] __do_softirq+0x114/0x344
    [ 87.019590] [<fffffc00080af45c>] irq_exit+0x74/0x98
    [ 87.024458] [<fffffc00080fac20>] __handle_domain_irq+0x98/0xfc
    [ 87.030278] [<fffffc000809056c>] gic_handle_irq+0x94/0x190

    This is caused by the vt visual_init() function calling into
    fbcon_init() with a vc_cur_blink_ms value of zero. This is a
    transient condition, as it is later set to a non-zero value. But, if
    the timer happens to expire while the blink rate is zero, it goes into
    an endless loop, and we get soft lockup.

    The fix is to initialize vc_cur_blink_ms before calling the con_init()
    function.

    Tested-by: Ming Lei <email address hidden>
    Acked-by: Pavel Machek <email address hidden>
    Acked-by: Scot Doyle <email address hidden>
    Signed-off-by: David Daney <email address hidden>
    Cc: <email address hidden>
    Reference: https://lkml.org/lkml/2016/5/17/455
    Cc: Ming Lei <email address hidden>
    Acked-by: Tim Gardner <email address hidden>
    Signed-off-by: Kamal Mostafa <email address hidden>