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[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

The traceback isn't always the same - here it was stuck in mod_timer():

[  180.912269] NMI watchdog: BUG: soft lockup - CPU#9 stuck for 22s! [swapper/9:0]
[  180.912293] Modules linked in: hid_generic(E) usbhid(E) hid(E) usb_storage(E) mdio_thunder(E) nicvf(E) ast(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) ttm(E) drm(E) nicpf(E) thunder_bgx(E) mdio_cavium(E)
[  180.912294] 
[  180.912298] CPU: 9 PID: 0 Comm: swapper/9 Tainted: G            E   4.4.0-21-generic #37-Ubuntu
[  180.912299] Hardware name: Cavium ThunderX CN88XX board (DT)
[  180.912302] task: ffff801f6c9d0000 ti: ffff801f6c9cc000 task.ti: ffff801f6c9cc000
[  180.912308] PC is at _raw_spin_unlock_irqrestore+0x2c/0x38
[  180.912312] LR is at mod_timer+0x12c/0x270
[  180.912314] pc : [<ffff8000008f5dc4>] lr : [<ffff800000131d2c>] pstate: 60400145
[  180.912315] sp : ffff801f6c9cfba0
[  180.912318] x29: ffff801f6c9cfba0 x28: ffff801f662982d8 
[  180.912320] x27: ffff801f6c9cfd00 x26: ffff801f7b369bb8 
[  180.912323] x25: ffff800000d69b80 x24: 0000000000000000 
[  180.912325] x23: ffff801f7b369b80 x22: ffff800000d8a000 
[  180.912328] x21: ffff801f7b369b80 x20: ffff801f7b369b80 
[  180.912330] x19: 0000000000000140 x18: 0000000000000069 
[  180.912332] x17: 0000000000468078 x16: ffff8000000c5b98 
[  180.912335] x15: 0000ffff7b779000 x14: 0000000000000008 
[  180.912337] x13: 0000000000000000 x12: 003d090000000000 
[  180.912340] x11: 00000000003d0900 x10: ffff80000090f200 
[  180.912342] x9 : 00003d0900000000 x8 : 000000000000000d 
[  180.912344] x7 : ffff801f7b3b4008 x6 : 0000000000000000 
[  180.912347] x5 : 0000000000000000 x4 : 0000000000000001 
[  180.912349] x3 : ffff801f6c9d0000 x2 : 00000000ffff8afb 
[  180.912351] x1 : 0000000000000140 x0 : 000000000000927c 
[  180.912352]

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https://bugs.launchpad.net/bugs/1574814

Title:
  ThunderX: soft lockup in cursor_timer_handler() Edit

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I booted a Cavium ThunderX crb1s 2.0 system using the netboot mini iso via virtual media:
    http://ports.ubuntu.com/ubuntu-ports/dists/xenial/main/installer-arm64/20101020ubuntu451/images/netboot/mini.iso

  During boot I observed the following lockup on the serial console:

  [ 28.128327] usb 1-1.1: reset high-speed USB device number 3 using xhci_hcd
  [ 84.912299] NMI watchdog: BUG: soft lockup - CPU#14 stuck for 23s! [swapper/14:0]
  [ 84.922718] Modules linked in: hid_generic(E) usbhid(E) hid(E) usb_storage(E) mdio_thunder(E) nicvf(E) ast(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) ttm(E) drm(E) nicpf(E) thunder_bgx(E) mdio_cavium(E)
  [ 84.922749]
  [ 84.922754] CPU: 14 PID: 0 Comm: swapper/14 Tainted: G E 4.4.0-21-generic #37-Ubuntu
  [ 84.922757] Hardware name: Cavium ThunderX CN88XX board (DT)
  [ 84.922761] task: ffff801f6c9d4100 ti: ffff801f6c9e8000 task.ti: ffff801f6c9e8000
  [ 84.922771] PC is at cursor_timer_handler+0x30/0x58
  [ 84.922775] LR is at cursor_timer_handler+0x30/0x58
  [ 84.922778] pc : [<ffff8000004ec4f0>] lr : [<ffff8000004ec4f0>] pstate: 00400145
  [ 84.922781] sp : ffff801f6c9ebc20
  [ 84.922784] x29: ffff801f6c9ebc20 x28: ffff8000f94398d8
  [ 84.922789] x27: ffff801f6c9ebd00 x26: ffff801f7b3bebb8
  [ 84.922793] x25: ffff801f6c9e8000 x24: ffff800000e5ec00
  [ 84.922798] x23: ffff801f667d9800 x22: ffff8000004ec4c0
  [ 84.922802] x21: 0000000000000100 x20: ffff8000f94398d8
  [ 84.922807] x19: ffff8000f9439800 x18: 0000ffffc76a5358
  [ 84.922811] x17: 0000ffff97bbd2a8 x16: ffff8000002a5040
  [ 84.922816] x15: 000000003e4cf1e0 x14: 0000000000000008
  [ 84.922820] x13: 0000000000000000 x12: 003d090000000000
  [ 84.922824] x11: 00000000003d0900 x10: ffff80000090f200
  [ 84.922829] x9 : 00003d0900000000 x8 : 000000000000000e
  [ 84.922833] x7 : ffff801f7b3c5008 x6 : 00000000ffffffff
  [ 84.922837] x5 : 0000000000000000 x4 : 0000000000000001
  [ 84.922842] x3 : 0000000000000000 x2 : ffff801f6c899e05
  [ 84.922846] x1 : ffff801f667d99e0 x0 : 0000000000000000
  [ 84.922850]
  [ 101.008387] usb 1-1.1: reset high-speed USB device number 3 using xhci_hcd
  [ 101.180375] usb 1-1.1: reset high-speed USB device number 3 using xhci_hcd
  [ 101.342677] random: nonblocking pool is initialized

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