The only difference I can see between the sessions that work (with
/usr/local unmounted) and those that fail (with /usr/local nfs mounted,
so all accesses get EACCES) is that when things go well I see the message:
gnome-session[2575]: DEBUG(+): Detected that screensaver has appeared on the bus
But when things fail that message is never printed.
The "Detected" message seems to be printed in response to
["/usr/bin/dbus-launch", "--exit-with-session",
"/usr/bin/gnome-session", "--autostart",
"/usr/share/gdm/greeter/autostart", "--debug"] receiving this message:
recvmsg(8, {msg_name(0)=NULL,
msg_iov(1)=[{"l\4\1\1-\0\0\0f\0\0\0\211\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\20\0\0\0NameOwnerChanged\0\0\0\0\0\0\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\10\1g\0\3sss\0\0\0\0\0\0\0\0\25\0\0\0org.gnome.ScreenSaver\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0:1.7\0"...,
2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 205
This message was sent by a child of gdm3:
sendmsg(12, {msg_name(0)=NULL,
msg_iov(2)=[{"l\4\1\1-\0\0\0f\0\0\0\211\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\20\0\0\0NameOwnerChanged\0\0\0\0\0\0\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\10\1g\0\3sss\0\0\0\0\0\0\0\0",
160}, {"\25\0\0\0org.gnome.ScreenSaver\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0:1.7\0", 45}],
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 205
But basically I get lost in a twisty little maze of sendmsgs all alike.
I've tried debugging the problem using fuse, and can replicate it by
simply making /usr/local a fuse filesystem that returns EACCES for all
operations.
Any ideas about how to go forwards?
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