Public bug reported:

It seems that when reading /proc/<pid>/stack we can sometimes triggers a
panic on i386.  This is triggered by an unsafe pointer access when
validating the stack in the stack unwinder.  This is reproducible in a 4
cpu 32bit VM with the stress-ng /proc stressor.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: In Progress

** Changed in: linux (Ubuntu)
       Status: New => In Progress

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  [artful] panic in update_stack_state when reading /proc/<pid>/stack on

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