** Description changed:

  At random occasions, pstree returns "/proc/xxxx: No such file or directory" 
on stderr. No output on stdout is produced.
  I can reproduce the problem using this script:
  
  #!/bin/bash
  for i in $(seq 1 1000); do
-         unset p
-         p=$(pstree -s -A $$ 2>/dev/null)
-         if [ "$?" -ne "0" ]; then
-                 p=$(pstree -s -A $$ 2>/dev/null)
-                 echo "Retry: $p"
-         fi
-         sleep 0.02
+         unset p
+         p=$(pstree -s -A $$ 2>/dev/null)
+         if [ "$?" -ne "0" ]; then
+                 p=$(pstree -s -A $$ 2>/dev/null)
+                 echo "Retry: $p"
+         fi
+         sleep 0.02
  done
  
  I have seen this behavior in version 22.15 (shipped with Ubuntu 12.04
  LTS, package version 22.15-2ubuntu1.2). The problem does not seem to
  occur on version 22.21 (shipped with Ubuntu 16.04 LTS).

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https://bugs.launchpad.net/bugs/1629839

Title:
  pstree reports "/proc/xxxx: No such file or directory"

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