Public bug reported:

during ripping down and freeing the aio request data structures we can
sometimes hit segfaults because we're still handling.

Solution is to:

1. cancel the signal handler
2. flag accounting is to stop (extra paranoid step)
3. put accounting stats on stack (extra paranoid step)

** Affects: stress-ng (Ubuntu)
     Importance: High
     Assignee: Colin Ian King (colin-king)
         Status: In Progress

** Changed in: stress-ng (Ubuntu)
       Status: New => In Progress

** Changed in: stress-ng (Ubuntu)
   Importance: Undecided => High

** Changed in: stress-ng (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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https://bugs.launchpad.net/bugs/1496340

Title:
  stress-ng aio on aarch64 segfaulting because accounting data is freed
  before signal handling is complete

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