[Bug 1472097] Re: XMir crashes when running with -rootless

[Daniel van Vugt]

xorg-server (2:1.17.3-2ubuntu2) xenial; urgency=medium


** Changed in: xorg-server (Ubuntu)
   Status: Fix Committed => Fix Released

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Daniel van Vugt]

Oh, maybe the intent is to use the X Composite extension in rootless.
That might avoid the need for special support in each Mir compositor.

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Daniel van Vugt]

https://git.launchpad.net/~xmir-team/xorg-
server/+git/xmir/commit/?id=15b4b153f194916324a289353879a2467ee941f6

** Changed in: xorg-server (Ubuntu)
 Assignee: Robert Ancell (robert-ancell) => Daniel van Vugt (vanvugt)

** Changed in: xorg-server (Ubuntu)
   Status: Confirmed => Fix Committed

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Daniel van Vugt]

Also, each compositor (including QtMir) would need to be modified to
support subsurface placement for rootless to work.

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Daniel van Vugt]

As far as I can tell "-rootless" mode actually is not implemented yet. I
can't make it crash but I can see that it mistakenly maps each X Window
(some of which could be menus or even individual widgets like in xedit)
to separate Mir surfaces. If we're going to continue on this path then
Mir needs full sub-surface (child/embedded surfaces) placement support.

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Robert Ancell]

** Changed in: xorg-server (Ubuntu)
   Status: Fix Released => Confirmed

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Launchpad Bug Tracker]

This bug was fixed in the package xorg-server - 2:1.17.2-1ubuntu4

---
xorg-server (2:1.17.2-1ubuntu4) wily; urgency=medium

  * debian/patches/xmir-rootless.patch:
- Fix crash when running XMir in rootless mode (LP: #1472097)

 -- Robert Ancell   Thu, 20 Aug 2015
16:31:37 +1200

** Changed in: xorg-server (Ubuntu)
   Status: Triaged => Fix Released

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  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Robert Ancell]

Hmm, now I try more complex applications (e.g. gedit) it does seem to
crash for those still. So this is probably not the complete solution.

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  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Robert Ancell]

It seems to have been caused by a logic error that was only calling
CompositeRedirectSubwindows for windows without a parent. I couldn't see
any reason why this should be the case and calling this for all windows
seems to fix xeyes.

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Title:
  XMir crashes when running with -rootless

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[Bug 1472097] Re: XMir crashes when running with -rootless

[Robert Ancell]

Reproducable by running:
(on VT1)
$ sudo mir_demo_server
(on VT2)
$ sudo chown $USER.$USER /var/run/user/$PID/mir_socket
$ XMir :1 -rootless 
(switch to VT1 then back to VT2)
$ DISPLAY=:1 xeyes
(XMir crashes)

The rootless code is kind of hacky, so I'd definitely use non rootless
mode until it's better understood / fixed.

** Summary changed:

- Failed assertion in compCopyWindow
+ XMir crashes when running with -rootless

** Changed in: xorg-server (Ubuntu)
   Status: New = Triaged

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  XMir crashes when running with -rootless

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