[4.17-rc4+ regression] X server does not start anymore with segmentation fault in `r600_dri.so`

[michel@xxxxxxxxxxx (Michel Dänzer)]

On 2018-05-13 11:01 AM, Paul Menzel wrote:
> Dear Linux AMD folks,
> 
> 
> There is a regression introduced by a commit after Linux 4.17-rc4
> causing the X.Org X server start to fail with the Radeon module loaded
> on Debian Sid/unstable. The same Linux kernel build works with the
> modesetting driver on the same system (no module *radeon* loaded) and
> with i915 and the modesetting driver on a different system with Debian
> 9.4 (Stretch/stable).
> 
>> [Â Â Â  16.263] xf86EnableIOPorts: failed to set IOPL for I/O (Operation
>> not permitted)
>> [â?¦]
>> [Â Â Â  16.765] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x50) [0x5b4e60]
>> [Â Â Â  16.766] (EE) 1: /usr/lib/xorg/Xorg (0x40d000+0x1abd92) [0x5b8d92]
>> [Â Â Â  16.766] (EE) 2: linux-gate.so.1 (__kernel_rt_sigreturn+0x0)
>> [0xb7f2ad5c]
>> [Â Â Â  16.766] (EE) 3: /lib/i386-linux-gnu/libc.so.6
>> (0xb78a0000+0x140099) [0xb79e0099]
>> [Â Â Â  16.766] (EE) 4: /usr/lib/i386-linux-gnu/dri/r600_dri.so
>> (0xb62f9000+0x6698fd) [0xb69628fd]

Crashes in r600_dri.so => most likely a Mesa bug. Can you get a gdb
backtrace of the crash?


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