Comment # 25 on bug 904987 from Joost W

(In reply to Steffen Golle from comment #24)
> I ran into the same problem. openSUSE Tumbleweed with Kernel 4.9.10 is not
> starting anymore. At boot, the plymouth splash screen doesn't show the
> password prompt. The system message from dracut-initqueue is: Failed to
> connect to the bus. No such file or directory.
> 
> Can you tell me, how to enter the dracut shell from grub?
The dracut shell should come up automatically if booting fails, though it has a
delay of 1-2minutes; try to boot and come back 5 minutes later.
At least your error message is different from the one I had, perhaps you have
more luck in fixing it. I had to give up and do a complete reinstall.