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1

The 16 groups per user limit is part of the sunRPC mechanism used for NFS (<4?). See RFC1057 "9.2 UNIX Authentication"
– ikrabbe
Commented Jun 2, 2016 at 5:45
2

link to nfs group limit is broken
– Tagar
Commented Sep 26, 2016 at 15:55
While this answer was correct when written, it's not quite true for any modern kernel. It's been 64 for over a decade now.
– KalEl
Commented Aug 1, 2022 at 3:54

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