Nouveau - Aug 2017 - [Bug 102106] New: xorg crashes when running gscan2pdf (libgtk2-perl) test case

https://bugs.freedesktop.org/show_bug.cgi?id=102106

            Bug ID: 102106
           Summary: xorg crashes when running gscan2pdf (libgtk2-perl)
                    test case
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: jffry at posteo.net
        QA Contact: xorg-team at lists.x.org

* What led up to the situation?

Download and extract the source:

wget
http://http.debian.net/debian/pool/main/g/gscan2pdf/gscan2pdf_1.6.0.orig.tar.xz
tar xvfJ gscan2pdf_1.6.0.orig.tar.xz
cd gscan2pdf-1.6.0

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

Run one of the test cases:

PERL5LIB="blib:lib:$PERL5LIB" perl t/114_cancel_save_pdf.t

   * What was the outcome of this action?

xorg crashed, and I was returned to the login screen

   * What outcome did you expect instead?

The test should have run through as normal

I tried to debug the problem by installing xserver-xorg-video-nouveau-dbg, ssh-
ing to the computer from another, starting gdb and attaching the PID of the
xorg process.

As long as gdb is attached to the process, and the -dbg package is installed,
xorg does not crash. Otherwise, it crashes every time. Not all the test cases
are affected. The 67 tests that run before this one, run fine.

If it does crash, it takes the ssh process with it, so I can't see the gdb
output.

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--- Comment #1 from jffry at posteo.net ---
This has been forwarded from Debian:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=857620

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
What leads you to believe this is nouveau-related?

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--- Comment #3 from jffry at posteo.net ---
Well, as Xorg is crashing, the problem must be either Xorg itself, or one of
its modules.

The tests run fine on other machines with other (Xorg) graphics drivers,
therefore I assume that the problem is nouveau.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Works for me...

$ DISPLAY=:1 PERL5LIB="blib:lib:$PERL5LIB" perl
t/114_cancel_save_pdf.t
1..1
test.jpg JPEG 70x46 70x46+0+0 8-bit sRGB 2649B 0.000u 0:00.000
ok 1 - can create a valid JPG after cancelling save PDF process

Where DISPLAY=:1 is running on a G92 GPU.

Xorg 1.19.3 + xf86-video-nouveau 1.0.15

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--- Comment #5 from jffry at posteo.net ---
The other two that crash X for me are:

t/124_cancel_save_djvu.t

t/252_cancel_negate.t

Do you have things still set up to try those, too?

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--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Well, my guess is there's something more going on. What GPU do you have? I
can
try running on a GK208 GPU as well (just wasn't easy to do immediately since
that's my main one, but I can start a second X session separately).

[Yes, it's relatively easy for me to test, but not this second.]

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--- Comment #7 from jffry at posteo.net ---
X.Org X Server 1.19.3
Module nouveau: vendor="X.Org Foundation"
[    18.179]    compiled for 1.19.3, module version = 1.0.15

NOUVEAU(0): Chipset: "NVIDIA NVC1"
nouveau 0000:01:00.0: NVIDIA GF108

I'd be happy to do some more debugging if you can help me get some useful
information out of the crash.

Unfortunately, as I said before, as long as gdb is attached to the process, and
the -dbg package is installed, xorg does not crash.

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I was unable to reproduce with GK208 as well. I'm not particularly inclined
to
believe that this is a nouveau issue, but ... you never know.

I'd recommend killing X, ssh'ing in from another machine, running X (and
*only*
X), e.g. "Xorg :0", and then, from another shell, running the affected
application (setting DISPLAY=:0). If that triggers the crash, you can try that
same setup with gdb and/or valgrind.

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--- Comment #9 from jffry at posteo.net ---
I use lightdm. I booted the machine, but didn't log in.

I logged in from another machine via ssh:

$ ps -efl | grep org
4 S root      7814   570  0  80   0 - 96782 -      22:24 tty7     00:00:00
/usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp
vt7 -novtswitch

ssh had evidently started X, although I didn't use -X or -Y.

$ export DISPLAY=:0
$ PERL5LIB="blib:blib/arch:lib:$PERL5LIB" perl
t/124_cancel_save_djvu.t
1..1
Invalid MIT-MAGIC-COOKIE-1 keyGtk-WARNING **: cannot open display: :0 at
/usr/lib/x86_64-linux-gnu/perl5/5.26/Gtk2.pm line 126.

$ Xorg :0
/usr/lib/xorg/Xorg.wrap: Only console users are allowed to run the X server

$ sudo Xorg :0
(EE) 
Fatal server error:
(EE) Server is already active for display 0
        If this server is no longer running, remove /tmp/.X0-lock
        and start again.
(EE) 
(EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
(EE) 

When I tried to log in with ssh -Y, the Perl test crashed and took out the ssh
connection. $DISPLAY was set to localhost:10, which I assume means that nouveau
is not the culprit.

How do I start the machine and not start X? Do I just kill X with -9, before
starting it again. Isn't that what I had at the first attempt? If so, why
could
I not connect to it?

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--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to jffry from comment #9)
> How do I start the machine and not start X? Do I just kill X with -9,
before
> starting it again. Isn't that what I had at the first attempt? If so,
why
> could I not connect to it?
Sorry, I don't do distro support. Back in the bad old days, you could figure
out what happened by looking at inittab, and modify rc.M or whatever.

You can start on :1 instead of :0 if you want to keep the existing one running,
just make sure to switch to that VT on the machine.

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--- Comment #11 from jffry at posteo.net ---
I ssh'ed in, started Xorg with sudo Xorg :1, ssh'ed in a second time,
set
DISPLAY, and ran the test.

Both ssh sessions died, and when I went back in, I saw that Xorg was still
running on :1

So now I am confused. The Xorg logs show no errors.

What else can I check?

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

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

--- Comment #12 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/361.

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