Debian Bug report logs - #910846
X server "Segmentation fault at address 0x0" when using about:support in Firefox-based browsers.

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: "Gong S." <pthfdr@protonmail.ch>

To: "submit@bugs.debian.org" <submit@bugs.debian.org>

Subject: X server "Segmentation fault at address 0x0" when using about:support in Firefox-based browsers.

Date: Fri, 12 Oct 2018 04:40:36 +0000

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Package: xserver-xorg-video-radeon
Version: 1:18.1.0-1

I am using a standalone AMD HD 7670. "firmware-amd-graphics" is installed and loaded during boot.
It seems that whenever I tries to query information about hardware acceleration, X segfaults.
"dmesg" does not show any error or warning after segfault.
Sometimes other programs or games trigger it as well, with the same problem described in the file Xorg.0.log.
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[Xorg.0.log (text/x-log, attachment)]

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[xorg.conf (text/plain, attachment)]

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Message #10 received at 910846@bugs.debian.org (full text, mbox, reply):

From: Michel Dänzer <michel@daenzer.net>

To: "Gong S." <pthfdr@protonmail.ch>

Cc: 910846@bugs.debian.org

Subject: Re: Bug#910846: X server "Segmentation fault at address 0x0" when using about:support in Firefox-based browsers.

Date: Fri, 12 Oct 2018 10:10:27 +0200

On 2018-10-12 6:40 a.m., Gong S. wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:18.1.0-1
> 
> I am using a standalone AMD HD 7670. "firmware-amd-graphics" is installed and loaded during boot.
> It seems that whenever I tries to query information about hardware acceleration, X segfaults.
> "dmesg" does not show any error or warning after segfault.
> Sometimes other programs or games trigger it as well, with the same problem described in the file Xorg.0.log.

[...]

> [   324.504] (EE) Backtrace:
> [   324.505] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x562764468de9]
> [   324.505] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50) [0x7f100883292f]
> [   324.506] (EE) 2: /usr/lib/xorg/modules/drivers/radeon_drv.so (_init+0x1592) [0x7f10073d4b24]
> [   324.506] (EE) 3: /usr/lib/xorg/Xorg (dri3_send_open_reply+0x55d) [0x562764438b4d]
> [   324.506] (EE) 4: /usr/lib/xorg/Xorg (drm_format_for_depth+0x93b) [0x56276443827b]
> [   324.506] (EE) 5: /usr/lib/xorg/Xorg (SendErrorToClient+0x35e) [0x56276430a97e]
> [   324.506] (EE) 6: /usr/lib/xorg/Xorg (InitFonts+0x3b6) [0x56276430e906]
> [   324.506] (EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x7f1008683b17]
> [   324.506] (EE) 8: /usr/lib/xorg/Xorg (_start+0x2a) [0x5627642f867a]
> [   324.506] (EE) 
> [   324.506] (EE) Segmentation fault at address 0x0

Please make sure the xserver-xorg-video-radeon-dbgsym and
xserver-xorg-core-dbgsym packages are installed, and either get a
backtrace with gdb or another log file.


Does the problem also happen without Option "AccelMethod" "EXA"? That's
the default and recommended configuration for your GPU.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

Message #15 received at 910846@bugs.debian.org (full text, mbox, reply):

From: "Gong S." <pthfdr@protonmail.ch>

To: "910846@bugs.debian.org" <910846@bugs.debian.org>

Subject: No packages.

Date: Sun, 14 Oct 2018 04:53:21 +0000

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There is no "xserver-xorg-video-radeon-dbgsym" or "xserver-xorg-core-dbgsym" in the repo.
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Message #20 received at 910846@bugs.debian.org (full text, mbox, reply):

From: Michel Dänzer <michel@daenzer.net>

To: "Gong S." <pthfdr@protonmail.ch>

Cc: 910846@bugs.debian.org

Subject: Re: Bug#910846: No packages.

Date: Mon, 15 Oct 2018 11:43:58 +0200

[Message part 1 (text/plain, inline)]

On 2018-10-14 6:53 a.m., Gong S. wrote:
> There is no "xserver-xorg-video-radeon-dbgsym" or
> "xserver-xorg-core-dbgsym" in the repo.

They're in a separate repository:

deb	https://deb.debian.org/debian-debug/	<suite>-debug	main contrib non-free

Replace <suite> with the name of the suite you're using in your main
repository entry.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

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Message #25 received at 910846@bugs.debian.org (full text, mbox, reply):

From: "Gong S." <pthfdr@protonmail.ch>

To: "910846@bugs.debian.org" <910846@bugs.debian.org>

Subject: Here is the result.

Date: Mon, 15 Oct 2018 11:35:46 +0000

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Here is the output of GDB.
I am no developer, thus I do not know whether this is what you want.
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Message #30 received at 910846@bugs.debian.org (full text, mbox, reply):

From: "Gong S." <pthfdr@protonmail.ch>

To: "910846@bugs.debian.org" <910846@bugs.debian.org>

Subject: User error.

Date: Mon, 15 Oct 2018 11:43:46 +0000

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Sorry, I have found the problem. If I remove this line from "/etc/X11/xorg.conf", X would not crash:
Option "DRI" "3"
So it is my fault. Sorry.
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Message #35 received at 910846@bugs.debian.org (full text, mbox, reply):

From: Michel Dänzer <michel@daenzer.net>

To: "Gong S." <pthfdr@protonmail.ch>

Cc: 910846@bugs.debian.org

Subject: Re: Bug#910846: User error.

Date: Mon, 15 Oct 2018 17:16:12 +0200

[Message part 1 (text/plain, inline)]

On 2018-10-15 1:43 p.m., Gong S. wrote:
> Sorry, I have found the problem. If I remove this line from "/etc/X11/xorg.conf", X would not crash:
> Option "DRI" "3"

If removing

	Option "AccelMethod" "EXA"

as well also works, that would be the best solution for you.


> So it is my fault. Sorry.

The crash is still a bug, even though EXA & DRI3 isn't recommended,
because it can't work correctly in some cases.

Any chance you can test if the attached patch fixes the crash?


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

[0001-dri3-Handle-radeon_get_pixmap_bo-returning-NULL.patch (text/x-patch, attachment)]

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Message #40 received at 910846@bugs.debian.org (full text, mbox, reply):

From: "Gong S." <pthfdr@protonmail.ch>

To: "910846@bugs.debian.org" <910846@bugs.debian.org>

Subject: Re: Bug#910846: User error.

Date: Mon, 15 Oct 2018 15:48:21 +0000

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Using "glamor" instead of "EXA" works. However, the manpage says "EXA (for pre-TAHITI GPUs) and glamor (for R300 or higher)". TURKS GPUs are pre-TAHITI ones.
I cannot test the patch for you. I have said, I am no developer, and I do not want to mess up my OS by recompiling an important package.
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Message #45 received at 910846@bugs.debian.org (full text, mbox, reply):

From: Michel Dänzer <michel@daenzer.net>

To: "Gong S." <pthfdr@protonmail.ch>

Cc: 910846@bugs.debian.org

Subject: Re: Bug#910846: User error.

Date: Mon, 15 Oct 2018 18:55:46 +0200

[Message part 1 (text/plain, inline)]

On 2018-10-15 5:48 p.m., Gong S. wrote:
> Using "glamor" instead of "EXA" works. However, the manpage says "EXA
> (for pre-TAHITI GPUs) and glamor (for R300 or higher)". TURKS GPUs
> are pre-TAHITI ones.

They're also post-R300. :) The next sentence (with side note which
doesn't apply here elided) in the manpage is:

The default is glamor with R600 or newer [...], otherwise EXA.


> I cannot test the patch for you.
No problem. I'll send out the patch for review anyway, it's pretty
likely it'll fix the crash.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

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