@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 <david.da...@cavium.com> 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 <ming....@canonical.com> Acked-by: Pavel Machek <pa...@ucw.cz> Acked-by: Scot Doyle <lkm...@scotdoyle.com> Signed-off-by: David Daney <david.da...@cavium.com> Cc: sta...@vger.kernel.org Reference: https://lkml.org/lkml/2016/5/17/455 Cc: Ming Lei <ming....@canonical.com> Acked-by: Tim Gardner <tim.gard...@canonical.com> Signed-off-by: Kamal Mostafa <ka...@canonical.com> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1574814 Title: ThunderX: soft lockup in cursor_timer_handler() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1574814/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs