In the case of the unavailable USB drive automount, the SSH session does
not hang if the following scripts are prevented from executing:
sudo chmod -x /etc/update-motd.d/91-release-upgrade
sudo chmod -x /etc/update-motd.d/98-fsck-at-reboot
The culprits can be found with:
sudo bpftrace -e 'tracepoint:syscalls:sys_enter_execve /str(args->filename) ==
"/usr/bin/stat"/ { printf("%s (PID %d) is executing stat\n", comm, pid); }'
Attaching 1 probe...
release-upgrade (PID 4146571) is executing stat
update-motd-fsc (PID 4146833) is executing stat
In 98-fsck-at-reboot, the following line probably triggers the automounts:
ext_partitions=$(mount | awk '$5 ~ /^ext(2|3|4)$/ { print $1 }' | grep -v
"/dev/nbd" || true)
But why does an incoming SSH session trigger scripts in /etc/update-
motd.d/ in the first place?
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https://bugs.launchpad.net/bugs/2130843
Title:
SSH sessions blocked on unavailable automounts by default in Ubuntu
25.10
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