[Bug 1845005] [NEW] rmap stressor should return EXIT_NO_RESOURCE when out of free space

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You have been subscribed to a public bug by Mathew Hodson (mathew-hodson):

== SRU Justification BIONIC, DISCO ==

When running the rmap stressor on systems with small file systems the
fallocate can fail to allocate a large file when running with may
stressors causing the stress test to exit with EXIT_FAILURE.  The
correct return is actually EXIT_NO_RESOURCE as there are not enough
resources to run the stress-test.

== Test Proceedure ==

Run rmap on a small file system with many stressors invoked, e.g.

stress-ng --rmap 2048 -t 60

without the fix, the test will exit with a failure. With the fix the
stressor will terminate early with just an out of resource message
rather than a hard test failure.

== Fix ==

upstream commit:

commit 38fd9c6ff96cb7e73f7cb3758bb303d874ad11b5
Author: Colin Ian King <colin.king at canonical.com>
Date:   Mon Sep 23 14:11:26 2019 +0100

    stress-rmap: don't make fallocate failures a rmap test failure (LP: #1845005)
    
    The rmap stressor should return EXIT_NO_RESOURCE and not EXIT_FAILURE
    when attempting to fallocate a file to rmap onto. This makes it a
    non-critical failure based on lack of resources rather than a stress
    test failure because rmap didn't fail per-se.
    
    Signed-off-by: Colin Ian King <colin.king at canonical.com>

== Regression Potential ==

This is a minor change to a return status and closing of opened
resources. The behaviour is now different on an allocation failure error
type, so applications running this stress test that checking a specific
error return may need updating. This is unlikely as most code checks for
0 success and non-zero for failure.

---------------------------------------------


The rmap stressor should return EXIT_NO_RESOURCE and not EXIT_FAILURE when attempting to fallocate a file to rmap onto. This makes it a non-critical failure based on lack of resources rather than a stress test failure because rmap failed.

** Affects: stress-ng (Ubuntu)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: Fix Released

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

** Affects: stress-ng (Ubuntu Disco)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: Fix Released

** Affects: stress-ng (Ubuntu Eoan)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: Fix Released


** Tags: verification-done verification-done-disco
-- 
rmap stressor should return EXIT_NO_RESOURCE when out of free space
https://bugs.launchpad.net/bugs/1845005
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