Re: [!GIT PULL] kdbus for 4.2

From	Andy Lutomirski <luto@amacapital.net>
Newsgroups	linux.kernel
Subject	Re: [!GIT PULL] kdbus for 4.2
Date	2015-07-03 02:40 +0200
Message-ID	<pHXbj-1sI-1@gated-at.bofh.it> (permalink)
References	<pFHu3-86c-27@gated-at.bofh.it> <pFHDJ-8hv-17@gated-at.bofh.it> <pFHDJ-8hv-15@gated-at.bofh.it>
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On Fri, Jun 26, 2015 at 12:36 PM, Tom Gundersen <teg@jklm.no> wrote:
> On Fri, Jun 26, 2015 at 9:33 PM, Andy Lutomirski <luto@amacapital.net> wrote:
>> What's a good distro on which to poke at a full running system?
>
> Fedora Rawhide is probably currently your best bet.

I won't swear that all of the problems I'm seeing are 100% kdbus'
fault, but Rawhide, updated today, has serious problems with the kdbus
branch in Greg's char-misc tree.

Problem 1: Booting a kdbus-enabled kernel (CONFIG_KDBUS=y) causes gdm
to bail saying "oops, something went wrong" or whatever the useless
standard error message is.

I can work around problem 1 by booting with kdbus=1, but that's not
okay.  Unless this is limited to just some narrow range of Rawhide
versions, I don't think the kernel gets to make changes that break
userspace like that.  Maybe this is a kernel issue, not a user issue,
in which case it's not a big deal as long as it gets fixed.

Problem 2: Running 'sudo mount /mnt/share' from a terminal hangs the
whole graphical session hard.  This is repeatable.  /mnt/share is
virtfs, but I doubt that matters.

If I build exactly the same sources but set CONFIG_KDBUS=n, all is well.

I suspect that there are multiple issues here:

1. The current state of systemd's --disable-kdbus could be buggy.
kdbusfs still gets mounted but isn't set up and then things break.

2. mount generates a bunch of dbus traffic.  Apparently on the latest
char-misc kdbus tree with the latest Rawhide, it blows up somehow.

That's all from me until next week.

--Andy
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Re: [!GIT PULL] kdbus for 4.2 Andy Lutomirski <luto@amacapital.net> - 2015-07-03 02:40 +0200
  Re: [!GIT PULL] kdbus for 4.2 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-07-03 17:30 +0200
    Re: [!GIT PULL] kdbus for 4.2 Richard Weinberger <richard@nod.at> - 2015-07-03 18:30 +0200
  Re: [!GIT PULL] kdbus for 4.2 Andy Lutomirski <luto@amacapital.net> - 2015-07-03 18:30 +0200

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