Comment # 9 on bug 1044294 from Ruediger Meier

Seems I have the same issue

[   72.229523] BUG: sleeping function called from invalid context at
../kernel/locking/mutex.c:97
[   72.229538] in_atomic(): 1, irqs_disabled(): 0, pid: 2387, name: mdadm
[   72.229544] CPU: 2 PID: 2387 Comm: mdadm Not tainted 4.4.73-18.17-default #1
[   72.229547] Hardware name: LENOVO 346034G/346034G, BIOS G6ETB5WW (2.75 )
09/01/2016


I can reproduce it 100%, but only on that Lenovo machine above
not on Qemu (I haven't tested other real machines yet.)

For me this kernel needs to run to trigger the bug:
kernel-default-4.4.73-18.17.1.x86_64

The previous kernel 4.4.72 works

I run util-linux test-suite:

$ cd util-linux/
$ make -j4 fdisk blkid losetup
$ sudo ./tests/ts/blkid/md-raid1-whole


Mostly the system freezes completely.