------- Comment From jac...@de.ibm.com 2017-03-30 08:50 EDT-------
New Kernel, new hang ...

?  961.242228! INFO: task kworker/1:1:38 blocked for more than 120 seconds.
?  961.242235!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.242236! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.242480! INFO: task xfsaild/dm-11:1742 blocked for more than 120 seconds.
?  961.242481!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.242482! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.242933! INFO: task rs:main Q:Reg:2043 blocked for more than 120 seconds.
?  961.242934!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.242935! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.243407! INFO: task cpuplugd:2355 blocked for more than 120 seconds.
?  961.243409!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.243410! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.243544! INFO: task irqbalance:2447 blocked for more than 120 seconds.
?  961.243546!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.243546! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.243617! INFO: task kworker/0:2H:3385 blocked for more than 120 seconds.
?  961.243618!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.243619! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.243911! INFO: task kworker/0:1H:6035 blocked for more than 120 seconds.
?  961.243912!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.243913! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.244405! INFO: task kworker/0:2:22440 blocked for more than 120 seconds.
?  961.244406!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.244407! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.244543! INFO: task kworker/0:4:22938 blocked for more than 120 seconds.
?  961.244545!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.244545! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
?  961.245404! INFO: task dpkg:24617 blocked for more than 120 seconds.
?  961.245405!       Not tainted 4.4.0-71-generic #92-Ubuntu
?  961.245406! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.

And the dump:

KERNEL: /usr/lib/debug/boot/vmlinux-4.4.0-71-generic
DUMPFILE: mclint_20170330_kernel_4_4_0-71_without_openafs.dump
CPUS: 1
DATE: Thu Mar 30 12:14:27 2017
UPTIME: 00:24:42
LOAD AVERAGE: 14.32, 12.51, 7.23
TASKS: 407
NODENAME: mclint
RELEASE: 4.4.0-71-generic
VERSION: #92-Ubuntu SMP Fri Mar 24 13:03:47 UTC 2017
MACHINE: s390x  (unknown Mhz)
MEMORY: 7.8 GB
PANIC: ""
PID: 0
COMMAND: "swapper/0"
TASK: bad528  [THREAD_INFO: b78000]
CPU: 0
STATE: TASK_RUNNING
INFO: no panic task found

The dump is already uploaded to Box

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https://bugs.launchpad.net/bugs/1670634

Title:
  blk-mq: possible deadlock on CPU hot(un)plug

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