[Bug middle-end/63404] gcc 5 miscompiles linux block layer

[andi-gcc at firstfloor dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63404

--- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Created attachment 33607
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33607&action=edit
not quite yet runnable test case


In the real execution blk_flush_complete_seq always ends up in the default case
in the switch and crashes.