Dear, Not sure i should report a bug so here is a report first. For more than 10 years now, we've been using mount binds to create shares rw or ro. It's been working perfectly under older Debian. A few months ago, we migrated to Ubuntu Jammy and started having processes running 100% non stop. While examining the processes in question, we could see the same thing: it seemed to be reading all the mounts indefinitely. It started with the phpsessionclean.service. We managed to fix it editing /lib/systemd/system/phpsessionclean.service and disabling sandboxing entries. But then it started to happen with other processes. Anything related to systemd seems affected in a way. For instance, we cannot start haproxy if the mounts are mounted. We tested with the last Debian and it is affected too.
We understand that 14 000 mounts is a lot. So maybe our usage will be questioned. But this has been working for ages so why not now? The problem can be very easily reproduced: 1. Launch the latest Debian stable 2. Execute the following script to create mounts: #!/bin/bash mkdir /home/test/directories mkdir /home/test/mounts for i in {1..14000} do echo "Mounting dir $i" mkdir "/home/test/directories/dir_$i" mkdir "/home/test/mounts/dir_$i" mount --bind -o rw "/home/test/directories/dir_$i" "/home/test/mounts/dir_$i" done After that, the "top" command will show processes getting stuck using 100% of CPU never ending. Has anyone a clue if this is fixable? Should i report a bug? Thanks for your help.