On Fri, 18 Nov 2016, Dmitry Vyukov wrote:

Hello,

The following program produces unkillable tasks blocked at the following stack:

I am pretty sure this got re-introduced by f2791e7eadf4, that basically 
reverts my attempt to work around you original report (that was fixed by 
09954bad44).

We'll have to figure out other way how to fix this that doesn't break 
odd userspace asumptions about semantics of O_NDELAY on floppies.

-- 
Jiri Kosina
SUSE Labs

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