As you suggested, we have upgraded the kernel as per 
OS boots to the updated kernel properly on our cavium server
Due to some issues with aarch64 kernel packages, the ‘build’ directory is 
missing under /lib/modules/<kver>/ after the update hence unable to build our 
smartpqi driver to retest this.

Please suggest how to upgrade to latest upstream kernel on aarch64 so
that we can build our smartpqi storage driver.

We have downloaded the following packages from http://kernel.ubuntu.com
/~kernel-ppa/mainline/v4.18-rc5 and installed.



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  Call trace observed while disabling PD on Ubuntu 16.04.4

Status in linux package in Ubuntu:

Bug description:
  I am working on smartpqi linux driver for Microsemi.

  We have a storage controller managment application tool to manage storage 
behind our controller. One of the application option what we have is to disable 
physical device(PD).
  During disable PD opertaion, Disable PD command got timedout. Then I observed 
below mentioned call trace in dmesg log.
  Please note we are running IO stress test on the PD which is being disabled.

  Please let me know if there are any known issues specific to Ubuntu kernel 
with respect to this. 
  If its a known issue specific to Ubuntu 16.04.4 distro, does this issue 
already addressed in latest Ubuntu OS distro ?

  Thanks in advance!

  Murthy Bhat

  Call trace:
  smartpqi 0000:92:00.0: removed 5:0:2:0 30000d1701cf2001 Direct-Access ATA 
ST1000NX0303 AIO+ qd=32
  [ 1199.201495] Buffer I/O error on dev sdk, logical block 244190645, async 
page read
  [ 1343.006515] sdn:
  [ 1358.264503] INFO: task kworker/173:1:1620 blocked for more than 120 
  [ 1358.271550] Tainted: G OE 4.13.0-36-generic #40~16.04.1-Ubuntu
  [ 1358.278966] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1358.286806] kworker/173:1 D 0 1620 2 0x00000000
  [ 1358.286832] Workqueue: events pqi_rescan_worker [smartpqi]
  [ 1358.286836] Call trace:
  [ 1358.286844] [<ffff000008086068>] __switch_to+0x90/0xa8
  [ 1358.286855] [<ffff000008a761c4>] __schedule+0x35c/0x8b0
  [ 1358.286858] [<ffff000008a7674c>] schedule+0x34/0x90
  [ 1358.286865] [<ffff0000084ccaa8>] blk_mq_freeze_queue_wait+0x70/0xd8
  [ 1358.286869] [<ffff0000084cd230>] blk_mq_freeze_queue+0x28/0x38
  [ 1358.286873] [<ffff0000084cd498>] blk_freeze_queue+0x20/0x30
  [ 1358.286878] [<ffff0000084bd830>] blk_cleanup_queue+0x78/0x128
  [ 1358.286883] [<ffff000008764f3c>] __scsi_remove_device+0x64/0x128
  [ 1358.286884] [<ffff000008765030>] scsi_remove_device+0x30/0x48
  [ 1358.286887] [<ffff000008765228>] scsi_remove_target+0x188/0x1c8
  [ 1358.286899] [<ffff000000bcbc08>] sas_rphy_remove+0x78/0x98 
  [ 1358.286907] [<ffff000000bcdbd8>] sas_port_delete+0x38/0x160 
  [ 1358.286918] [<ffff00000141a32c>] pqi_free_sas_port+0x4c/0x88 [smartpqi]
  [ 1358.286926] [<ffff00000141a6fc>] pqi_remove_sas_device+0x24/0x38 [smartpqi]
  [ 1358.286933] [<ffff000001413b80>] pqi_update_device_list+0x520/0x818 
  [ 1358.286939] [<ffff000001415af8>] pqi_scan_scsi_devices+0x420/0x980 
  [ 1358.286946] [<ffff0000014160b4>] pqi_rescan_worker+0x24/0x30 [smartpqi]
  [ 1358.286955] [<ffff0000080f3dfc>] process_one_work+0x14c/0x420
  [ 1358.286957] [<ffff0000080f41fc>] worker_thread+0x12c/0x470
  [ 1358.286961] [<ffff0000080fae80>] kthread+0x108/0x138
  [ 1358.286963] [<ffff0000080838e0>] ret_from_fork+0x10/0x30
  [ 1358.287045] INFO: task pain:6788 blocked for more than 120 seconds.
  [ 1358.293326] Tainted: G OE 4.13.0-36-generic #40~16.04.1-Ubuntu
  [ 1358.300730] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1358.308567] pain D 0 6788 6633 0x00000000

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