In the NetBSD system, I am seeing this issue where Top command shows the -ve value for resident memory. I checked the memory leak in the code and I did not find any. In fact it is also in case of shell (SH) process [not shown in the picture below].
I'm curious if a bug in the user program could be the cause of this behavior. If this is true, then I want to understand how I can reproduce this issue.
In addition to this, if any known bugle in NetBSD or GCC Library can cause this problem.
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top There is a relatively poor cousin. I would not be surprised if there are some bugs related to integer conversions (signed / unsigned, overflow, etc.). The original top code is not the highest quality at the first place.