On Mon, 2016-07-11 at 11:46 +0200, Yves-Alexis Perez wrote: > > I wonder whether there are other reasons why epoll_ctl can report EINVAL? > > The syscall source code is at http://lxr.free-electrons.com/source/fs/eventp > ol > l.c#L1849 and it seems EINVAL is used as a default error case at various > places, so maybe. > > > > I also wonder whether the new lightdm is starting dbus-launch with a > > different value for some arbitrary kernel limit, or whether your previous > > session leaked some fds resulting in dbus-launch coming up with 90% of > > an arbitrary limit already in use, or something like that? > > For what it's worth, after closing the first session there's no process > running under my uid. I'll try to check the limits in 75dbus to see if they > differ.
Some more investigation: I've done a bisect in lightdm and the offending commit is https://bazaar.launchpad.net/~lightdm-team/lightdm/1.18/revision/231 9 which is a somehow large refactoring, I didn't yet identify what could be the problem there (but reported that upstream as well). I've checked the currently opened file descriptors when when starting the session (I've added an ls -l /proc/self/fd in 75dbus..) and here are the results (don't bother about the PIDs, the “first” login was after a lightdm restart after the “second” login). For the first login: + ls -l /proc/self/fd total 0 lr-x------ 1 corsac corsac 64 Jul 11 12:56 0 -> /dev/null l-wx------ 1 corsac corsac 64 Jul 11 12:56 1 -> /home/corsac/.xsession-errors l-wx------ 1 corsac corsac 64 Jul 11 12:56 2 -> /home/corsac/.xsession-errors lr-x------ 1 corsac corsac 64 Jul 11 12:56 3 -> /proc/30014/fd For the second: + ls -l /proc/self/fd total 0 lr-x------ 1 corsac corsac 64 Jul 11 12:56 0 -> /proc/29846/fd l-wx------ 1 corsac corsac 64 Jul 11 12:56 1 -> /home/corsac/.xsession-errors l-wx------ 1 corsac corsac 64 Jul 11 12:56 2 -> /home/corsac/.xsession-errors So it seems stdin is closed for the second login. Could it break dbus- launch/dbus-daemon somehow? Regards, -- Yves-Alexis
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