Hi,
I'd like to add here that I just ran into this in a different way. I do my
development in profile=destkop chroots which are also missing the /dev/shm
line in fstat like the default profile.
In my case upstream was using faketime(1) to tame some unreproducibility,
but this needs access to /dev/shm to function at all. Curiously the
permissions of /dev/shm were such that only root could write there:
(unstable-amd64-dekstop):~$ ls -ld /dev/shm
drwxr-xr-x 2 root root 40 Oct 16 10:36 /dev/shm
Adding the fstab line fixes this as tmpfs seems to set the mount point to
mode 777.
FYI: I build my sbuild and "desktop" chroots with sbuild-createchroot(8).
--Daniel
