Nouveau - Jun 2018 - [Bug 106772] New: Xorg crashes with nouveau and dual screen setup

https://bugs.freedesktop.org/show_bug.cgi?id=106772

            Bug ID: 106772
           Summary: Xorg crashes with nouveau and dual screen setup
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: bircoph at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 139910
  --> https://bugs.freedesktop.org/attachment.cgi?id=139910&action=edit
gdb.log

Hi!

I tried Nouveau (xorg-dri-nouveau-18.1.0 from mesa 18.1.0 and
xorg-drv-nouveau-1.0.15) with the latest xorg-1.20 and dual monitors. With
single screen and xinerama it works fine, with dual screens (w/o xinerama) it
segfaults, see log below.

I want to use separate X screens, since monitors have sufficiently different
DPI and color temp and Xinerama doesn't allow different DPI on different
monitors.

Kernel in use is 4.6.13 with nouveau built as module.

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--- Comment #1 from Andrew Savchenko <bircoph at gmail.com> ---
Created attachment 139913
  --> https://bugs.freedesktop.org/attachment.cgi?id=139913&action=edit
Full xorg.log

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--- Comment #2 from Andrew Savchenko <bircoph at gmail.com> ---
Created attachment 139918
  --> https://bugs.freedesktop.org/attachment.cgi?id=139918&action=edit
xorg.conf

xorg.conf for dual head setup with screens, I tried to remove Option
ZaphodHeads and to add Option DRI 3, all attempts results in the same failure
as above.

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--- Comment #3 from Andrew Savchenko <bircoph at gmail.com> ---
Created attachment 139922
  --> https://bugs.freedesktop.org/attachment.cgi?id=139922&action=edit
lspci

lspci -v output for the VGA device

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--- Comment #4 from Andrew Savchenko <bircoph at gmail.com> ---
Created attachment 139924
  --> https://bugs.freedesktop.org/attachment.cgi?id=139924&action=edit
xrandr output

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--- Comment #5 from Keith Packard <keithp at keithp.com> ---
Looks like Nouveau still parties like it's 1999. I don't think more
recent
drivers do mode setting this early. However, it's easy enough to handle this
case by simply skipping the RRCrtcIsLeased and RROutputIsLeased calls when the
respective DIX objects haven't been created yet. Here's a patch which
simply
wraps those functions in xf86 code that checks for NULL pointers before calling
the DIX code.

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--- Comment #6 from Keith Packard <keithp at keithp.com> ---
Created attachment 139958
  --> https://bugs.freedesktop.org/attachment.cgi?id=139958&action=edit
xfree86: Wrap RRCrtcIsLeased and RROutputIsLeased to check for DIX structures

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--- Comment #7 from Mariusz Białończyk <manio at skyboo.net> ---
Hello Keith,
I suffer from the same problem - crash on startup.
The backtrace is identical (attaching).
The circumstances are the same - I have four monitors with two nvidia cards
using nouveau driver.
I am using xinerama.

After applying your patch the backtrace is different:

double free or corruption (!prev)
(EE)
(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4a) [0x5637ad9347da]
(EE) 1: /usr/lib/xorg/Xorg (0x5637ad780000+0x1b8489) [0x5637ad938489]
(EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7efc039f4000+0x11f50)
[0x7efc03a05f50]
(EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0x10b) [0x7efc0366ee7b]
(EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x151) [0x7efc03670231]
(EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (0x7efc0363a000+0x777b7)
[0x7efc036b17b7]
(EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (0x7efc0363a000+0x7dd5a)
[0x7efc036b7d5a]
(EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (0x7efc0363a000+0x7f81c)
[0x7efc036b981c]
(EE) 8: /usr/lib/xorg/Xorg (PanoramiXCreateConnectionBlock+0x20a)
[0x5637ad87f98a]
(EE) 9: /usr/lib/xorg/Xorg (0x5637ad780000+0x609e1) [0x5637ad7e09e1]
(EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xe7)
[0x7efc0365ba87]
(EE) 11: /usr/lib/xorg/Xorg (_start+0x2a) [0x5637ad7ca6ca]

Attaching a full log.

regards,
manio

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--- Comment #8 from Mariusz Białończyk <manio at skyboo.net> ---
Created attachment 140621
  --> https://bugs.freedesktop.org/attachment.cgi?id=140621&action=edit
backtrace before any patch

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--- Comment #9 from Mariusz Białończyk <manio at skyboo.net> ---
Created attachment 140622
  --> https://bugs.freedesktop.org/attachment.cgi?id=140622&action=edit
full Xorg log after patching

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #10 from Martin Peres <martin.peres at free.fr> ---
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