Hello Marc,

It is difficult for me to debug remotely the issue since I don't have
the setup to reproduce it

can you try to do a single folder access and see if the fd number grows 
systematically ?
or it only grows on a certain access pattern

Furthermore, can you strace the autofs process:

Something like:

pid=$(systemctl show autofs --property=MainPID --value)
sudo strace -ff -tt -yy \
  -p "$(ps -T -p "$pid" -o tid= | paste -sd,)" \
  -e trace=socketpair,close


** Changed in: autofs (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2152277

Title:
  automount leaks Unix socketpairs per mount helper invocation — fd
  exhaustion after days/weeks of uptime

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