The kernel crashed when I started X, with a BUG in drivers/scsi/scsi_lib.c. The crash was not immediately reproducible. Here is a screenshot: http://home.mathematik.uni-freiburg.de/ziegler/DSCN6480.JPG
Please have a look at the following e-mail thread: http://thread.gmane.org/gmane.linux.kernel/2088075.
So I better wait for 4.4-rc4... Thanks, Martin
Please try to reproduce this bug with latest kernel image.
The bug did not appear in later kernels. I should have report this earlier. Sorry (Martin Ziegler)
Can you close this bug, please?