NetBSD Problem Report #54180

From www@netbsd.org  Thu May  9 07:35:05 2019
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Date: Thu,  9 May 2019 07:35:03 +0000 (UTC)
From: dogan@tesmer.org.tr
Reply-To: dogan@tesmer.org.tr
To: gnats-bugs@NetBSD.org
Subject: xorg segmentation fault with drm
X-Send-Pr-Version: www-1.0

>Number:         54180
>Category:       kern
>Synopsis:       xorg segmentation fault with drm
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 09 07:40:00 +0000 2019
>Last-Modified:  Mon Jun 10 10:40:01 +0000 2019
>Originator:     Mustafa Dogan
>Release:        NetBSD 8.0_STABLE on amd64
>Organization:
TESMER
>Environment:
NetBSD localhost 8.0_STABLE NetBSD 8.0_STABLE (MuDo) #0: Mon May  6 07:43:31 +03 2019  root@research.net.md:/root/OBJ/sys/arch/amd64/compile/MuDo amd64
>Description:
After recent src changes (probably dated on 22-23 April 2019) related to drm, xorg starts as expected, but crashes a few minutes with segmentation fault.
I tried several different PCs and laptops (most of them have i915drmkms). My observations are:
- If drm device detected and used at boot time, xorg crashes.
- If PC doesn't have usable drm, vesa driver works well.
- If disabled drm at boot time ("userconf disable i915drmkms" for example) loaded vesa driver and works well.

Last portion of sample output of Xorg.0.log is below:
[    35.742] (II) XINPUT: Adding extended input device "<default keyboard>" (type: KEYBOARD, id 7)
[    42.831] (II) intel(0): EDID vendor "LGD", prod id 699
[    42.831] (II) intel(0): Printing DDC gathered Modelines:
[    42.831] (II) intel(0): Modeline "1366x768"x0.0   71.00  1366 1414 1446 1498  768 771 776 790 +hsync -vsync (47.4 kHz eP)
[    42.831] (II) intel(0): Modeline "1366x768"x0.0   71.00  1366 1414 1446 1833  768 771 776 968 +hsync -vsync (38.7 kHz e)
[  2030.189] (EE) Segmentation fault at address 0x7ee0f7255000
[  2030.190] (EE) 
Fatal server error:
[  2030.191] (EE) Caught signal 11 (Segmentation fault). Server aborting
[  2030.191] (EE) 
[  2030.191] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.X.Org
 for help. 
[  2030.192] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  2030.192] (EE) 
[  2030.193] (II) AIGLX: Suspending AIGLX clients for VT switch
[  2030.978] (EE) Server terminated with error (1). Closing log file.

>How-To-Repeat:
Boot NetBSD 8 built with latest source on a pc with i915 (or detected as i915) VGA chipset. Start startx and try to open some programs (I used xfce4, and thunar is enough for trigger this error).
>Fix:
Workaround: 
At boot time:
Go to command prompt before kernel load.
> userconf disable i915drmkms
> boot

After login, you can use xorg as usual.

>Audit-Trail:
From: matthew green <mrg@eterna.com.au>
To: gnats-bugs@netbsd.org, dogan@tesmer.org.tr
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
    netbsd-bugs@netbsd.org
Subject: re: kern/54180: xorg segmentation fault with drm
Date: Thu, 09 May 2019 17:51:03 +1000

 thanks for the report.

 can you try this with change applied?

 http://mail-index.netbsd.org/source-changes/2019/03/18/msg104376.html

 i'm fairly sure this is what is wrong, but i don't have a netbsd-8
 intel gpu box to test.

 thanks.


 .mrg.

From: "Mustafa Dogan" <dogan@tesmer.org.tr>
To: mrg@eterna.com.au,
 gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org,
 gnats-admssin@netbsd.org,
 netbsd-bugs@netbsd.org
Subject: re: kern/54180: xorg segmentation fault with drm
Date: Fri, 10 May 2019 10:33:14 +0300

 > The following reply was made to PR kern/54180; it has been noted by GNATS.
 >
 > From: matthew green <mrg@eterna.com.au>
 > To: gnats-bugs@netbsd.org, dogan@tesmer.org.tr
 > Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
 >     netbsd-bugs@netbsd.org
 > Subject: re: kern/54180: xorg segmentation fault with drm
 > Date: Thu, 09 May 2019 17:51:03 +1000
 >
 >  thanks for the report.
 >
 >  can you try this with change applied?
 >
 >  http://mail-index.netbsd.org/source-changes/2019/03/18/msg104376.html
 >
 >  i'm fairly sure this is what is wrong, but i don't have a netbsd-8
 >  intel gpu box to test.
 >
 >  thanks.
 >
 >
 >  .mrg.
 >
 >

 Hi,
 Thank you for your quick response.
 Yesterday, (May 9) I copied intel_list.h from current and make fresh
 build. It could be an illusion, but I noticed that crash delayed from a
 few minutes to a few ten minutes. Unfortunately, segmentation fault
 occursed and this change didn't solve crash issue for me...
 I will try different boxes with i915drmkms and will send my observations
 asap.
 Kind regards,
 Mustafa Dogan

From: David Holland <dholland-bugs@netbsd.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/54180: xorg segmentation fault with drm
Date: Mon, 10 Jun 2019 05:32:52 +0000

 not sent to gnats (use gnats-bugs, not gnats-admin)

    ------

 From: Anthony Mallet <tho@useless-ficus.net>
 To: gnats-admin@netbsd.org, matthew green <mrg@eterna.com.au>
 Subject: re: kern/54180: xorg segmentation fault with drm
 Date: Thu, 9 May 2019 14:55:26 +0200

 FWIW this change
 (http://mail-index.netbsd.org/source-changes/2019/03/18/msg104376.html)
 also fixed a weird segfault issue in xorg that appeared when simply
 upgrading from kernel 8.99.37 to 8.99.39 with no userland update. I
 don't see how it can be related but anyway ...

 I'm using modular xorg from pkgsrc, I applied the patch in
 xf86-video-intel. Should I create a new PR to port the patch to
 pkgsrc?

From: "Mustafa Dogan" <dogan@tesmer.org.tr>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/54180: xorg segmentation fault with drm
Date: Mon, 10 Jun 2019 13:39:06 +0300

 > The following reply was made to PR kern/54180; it has been noted by GNATS.
 >
 > From: David Holland <dholland-bugs@netbsd.org>
 > To: gnats-bugs@netbsd.org
 > Cc:
 > Subject: Re: kern/54180: xorg segmentation fault with drm
 > Date: Mon, 10 Jun 2019 05:32:52 +0000
 >
 >  not sent to gnats (use gnats-bugs, not gnats-admin)
 >
 >     ------
 >
 >  From: Anthony Mallet <tho@useless-ficus.net>
 >  To: gnats-admin@netbsd.org, matthew green <mrg@eterna.com.au>
 >  Subject: re: kern/54180: xorg segmentation fault with drm
 >  Date: Thu, 9 May 2019 14:55:26 +0200
 >
 >  FWIW this change
 >  (http://mail-index.netbsd.org/source-changes/2019/03/18/msg104376.html)
 >  also fixed a weird segfault issue in xorg that appeared when simply
 >  upgrading from kernel 8.99.37 to 8.99.39 with no userland update. I
 >  don't see how it can be related but anyway ...

 I'm using 8.1_STABLE on amd64 and xorg included in base system (native). I
 tried this patch, but it doesn't solve the problem for me.

 >  I'm using modular xorg from pkgsrc, I applied the patch in
 >  xf86-video-intel. Should I create a new PR to port the patch to
 >  pkgsrc?

 Sure, you can. But, could it be helpful for native xorg xf86-video-intel
 driver users?
 Regards,
 Mustafa

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