RTEMS | previous is not always NULL for node set off chain (#5491)

[Chandan U (@Chandanuvm)]

Chandan U commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5491#note_143031


hello! @gedare 

I worked in this issue and created a MR : https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1067/diffs?commit_id=708a6dfe10ca2da3ba4d41d017e82ad11cc970d7

Config:

\[sparc/leon3\]RTEMS_SMP = True RTEMS_DEBUG = True RTEMS_POSIX_API = True BUILD_TESTS = True BUILD_SMPTESTS = True BUILD_SPTESTS = True

Below is the before and after logs :  

Before:

![Screenshot from 2026-02-19 23-05-40.png](/uploads/267fa7640d25e9d2f614d9fae492007b/Screenshot_from_2026-02-19_23-05-40.png){width=900 height=500}

After:

![Screenshot from 2026-02-19 23-05-09.png](/uploads/ecf03814802daf1634898c2f7ee74cde/Screenshot_from_2026-02-19_23-05-09.png){width=900 height=404}

the 5 failed tests i believe is not related to this issue, there were no assertion on \__Chain\__Is_node_off_chain.

below are the after changes log files: 

1) this is for all tests

[leon3-sis-all.log](/uploads/467e2b2ea61b7dfe4d61ffa1b423ef09/leon3-sis-all.log)

2) only smp tests

[leon3-sis.log](/uploads/29e40ef0992c01e72b3dbd2993a794cc/leon3-sis.log)

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5491#note_143031
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