[Bug 216983] emulators/linux_base-c6: info message advises to make the system not boot properly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216983

            Bug ID: 216983
           Summary: emulators/linux_base-c6: info message advises to make
                    the system not boot properly
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: emulation at FreeBSD.org
          Reporter: godevilove at ya.ru
          Assignee: emulation at FreeBSD.org
             Flags: maintainer-feedback?(emulation at FreeBSD.org)

1. install message for linux_base-c6 tells me to add 2 mounts to /etc/fstab
because some programs might need it:

pkg info -D linux_base-c6
linux_base-c6-6.8_11:
Always:
Some programs need linprocfs mounted on /compat/linux/proc.  Add the
following line to /etc/fstab:

linprocfs   /compat/linux/proc  linprocfs       rw      0       0

Then run "mount /compat/linux/proc".

Some programs need tmpfs mounted on /compat/linux/dev/shm.  Add the
following line to /etc/fstab:

tmpfs    /compat/linux/dev/shm  tmpfs   rw,mode=1777    0       0

Then run "mount /compat/linux/dev/shm".

2. if I add them just like that and reboot - the system will boot into a single
user mode, because '/etc/fstab' fails to mount those mounts.
3. it so turns out that one needs to add

linux_load="YES"
linprocfs_load="YES"

to the '/boot/loader.conf' file.

4. even with those lines added to the '/boot/loader.conf', the tmpfs mount in
'/etc/fstab' will still lead to booting into a single user mode.

As far as I know (not 100% sure), but adding 'late' option to the tmpfs mount
entry in '/etc/fstab' resolves the issue, but this is not mentioned anywhere
and the port's info message directly advises to add quite specific line to
'/etc/fstab', which leads to system not booting properly.

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