[Bug 101998] X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=101998

--- Comment #2 from Michel Dänzer  ---
Please attach the corresponding dmesg output as well.

(In reply to Meik Neubauer from comment #0)
> [   120.087] (EE) Backtrace:
> [   120.087] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e)
> [0x55cb016cbf7e]
> [   120.087] (EE) 1: /usr/lib/xorg/Xorg (0x55cb0151a000+0x1b5ce9)
> [0x55cb016cfce9]

We need to know where in the Xorg code this is located. Make sure the
xserver-xorg-core-dbg(sym) package is installed, then try

 addr2line -i -e /usr/lib/xorg/Xorg 0x55cb016cfce9

If that fails to resolve the source code location, manually start Xorg in gdb
and get a backtrace when it crashes.

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[Bug 101998] X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=101998

Michel Dänzer  changed:

   What|Removed |Added

 Attachment #133168|text/x-log  |text/plain
  mime type||

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[Bug 101998] X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=101998

--- Comment #1 from Meik Neubauer  ---
Created attachment 133169
  --> https://bugs.freedesktop.org/attachment.cgi?id=133169=edit
older logfile without errors (compare this to the current logfile)

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[Bug 101998] New: X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=101998

Bug ID: 101998
   Summary: X server 1.19.3 failure with amdgpu (radeon M295X) on
Ubuntu HWE16.04 kernel 4.10.0-28
   Product: xorg
   Version: 7.7 (2012.06)
  Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
  Severity: blocker
  Priority: medium
 Component: Driver/AMDgpu
  Assignee: xorg-driver-ati@lists.x.org
  Reporter: t...@meikneubauer.de
QA Contact: xorg-t...@lists.x.org

Created attachment 133168
  --> https://bugs.freedesktop.org/attachment.cgi?id=133168=edit
log file showing segmentation fault

Note: The problem only occurs if an external monitor is attached!

Kernel initialization is ok. Seeing boot msgs on all ext. monitors driven by
AMD.

Subsequent Greeter load failures are accompanied by these messages:

Aug  1 13:24:59 mnmaster kernel: [   40.455942]
[drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed: 5 tries
Aug  1 13:24:59 mnmaster kernel: [   40.455954]
[drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* channel eq failed

Greeter is then stable after a few failures and login is possible.
Xorg.0.log shows segmentation fault:

[   119.868] randr: falling back to unsynchronized pixmap sharing
[   120.087] (EE) 
[   120.087] (EE) Backtrace:
[   120.087] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55cb016cbf7e]
[   120.087] (EE) 1: /usr/lib/xorg/Xorg (0x55cb0151a000+0x1b5ce9)
[0x55cb016cfce9]
[   120.087] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0
(0x7f1587a1d000+0x11390) [0x7f1587a2e390]
[   120.087] (EE) 
[   120.087] (EE) Segmentation fault at address 0x0
[   120.087] (EE) 
Fatal server error:
[   120.087] (EE) Caught signal 11 (Segmentation fault). Server aborting


I will add the current Xorg.0.log and also an older Xorg.0.log from April that
used the 4.8.0-36 kernel. Please compare these logs to see that the root cause
seems to be that amdgpu cannot allocate a frame buffer.

I should also mention that kern.log is flooded with these messages (but that
may not be related to the error):
Aug  1 14:44:19 mnmaster kernel: [ 2759.820005] [drm:drm_mode_addfb2 [drm]]
[FB:74]
Aug  1 14:44:19 mnmaster kernel: [ 2759.847678] [drm:drm_mode_addfb2 [drm]]
[FB:77]

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