Package: dpkg
Version: 1.20.9
Severity: normal
File: /sbin/start-stop-daemon

Hi,

I was debugging an init script in a Debian Docker container, and found
it always fails to stop the daemon. Upon a closer inspection, I found
that --exec, which init-d-script always passed, never matches the
executable, even if a PID file is used. I then checked the source and
tried to do the steps manually:

    root@d351c00abb80:/# ls /proc/1841/exe -l
    ls: cannot read symbolic link '/proc/1841/exe': Permission denied
    lrwxrwxrwx 1 sphinxsearch sphinxsearch 0 Dec  3 08:46 /proc/1841/exe

In fact, cwd and root are also inaccessible. I’m not sure it’s some
security setting Docker applies or is it something becaue of the
containers, but the fact is that --exec is unusable in this setting.

I guess falling back to other matching methods might be more useful than
failing to stop at all.

-- 
Cheers,
  Andrej

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