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

[Paul Menzel]

On 2018-05-14 10:44, Michel Dänzer wrote:
> 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).
>> 
>>> [    16.263] xf86EnableIOPorts: failed to set IOPL for I/O (Operation
>>> not permitted)
>>> […]
>>> [    16.765] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x50) 
>>> [0x5b4e60]
>>> [    16.766] (EE) 1: /usr/lib/xorg/Xorg (0x40d000+0x1abd92) 
>>> [0x5b8d92]
>>> [    16.766] (EE) 2: linux-gate.so.1 (__kernel_rt_sigreturn+0x0)
>>> [0xb7f2ad5c]
>>> [    16.766] (EE) 3: /lib/i386-linux-gnu/libc.so.6
>>> (0xb78a0000+0x140099) [0xb79e0099]
>>> [    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?

```
#0  0xb7f1bd45 in __kernel_vsyscall ()
#1  0xb78bd5b2 in __libc_signal_restore_set (set=0xbf93883c) at 
../sysdeps/unix/sysv/linux/nptl-signals.h:80
#2  __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:48
#3  0xb78be9d1 in __GI_abort () at abort.c:79
#4  0x0061bf45 in OsAbort () at ../../../../os/utils.c:1361
#5  0x004ec96c in ddxGiveUp (error=EXIT_ERR_ABORT) at 
../../../../../../hw/xfree86/common/xf86Init.c:1011
#6  0x004eca05 in AbortDDX (error=EXIT_ERR_ABORT) at 
../../../../../../hw/xfree86/common/xf86Init.c:1055
#7  0x00621c6f in AbortServer () at ../../../../os/log.c:874
#8  0x00622654 in FatalError (f=0x650110 "Caught signal %d (%s). Server 
aborting\n") at ../../../../os/log.c:1015
#9  0x00618def in OsSigHandler (signo=11, sip=0xbf938b4c, 
unused=0xbf938bcc) at ../../../../os/osinit.c:154
#10 <signal handler called>
#11 __memcpy_ssse3 () at 
../sysdeps/i386/i686/multiarch/memcpy-ssse3.S:144
#12 0xb69518fd in memcpy (__len=48, __src=<optimized out>, 
__dest=<optimized out>) at 
/usr/include/i386-linux-gnu/bits/string_fortified.h:34
#13 r600_create_vertex_fetch_shader (ctx=0xf08e40, count=2, 
elements=0xbf93933c) at 
../../../../../src/gallium/drivers/r600/r600_asm.c:2701
#14 0xb67227a8 in util_blitter_create (pipe=<optimized out>) at 
../../../../src/gallium/auxiliary/util/u_blitter.c:299
#15 0xb6956ab3 in r600_create_context (screen=0xf07060, priv=0x0, 
flags=0) at ../../../../../src/gallium/drivers/r600/r600_pipe.c:217
#16 0xb6956e41 in r600_screen_create (ws=0xf05800, config=0xbf939548) at 
../../../../../src/gallium/drivers/r600/r600_pipe.c:767
#17 0xb6aa6942 in radeon_drm_winsys_create (fd=<optimized out>, 
config=<optimized out>, screen_create=<optimized out>) at 
../../../../../../src/gallium/winsys/radeon/drm/radeon_drm_winsys.c:835
#18 0xb631ae73 in pipe_r600_create_screen (fd=12, config=0xbf939548) at 
../../../../../src/gallium/auxiliary/target-helpers/drm_helper.h:144
#19 0xb67e893e in pipe_loader_create_screen (dev=0xf06780) at 
../../../../../src/gallium/auxiliary/pipe-loader/pipe_loader.c:137
#20 0xb66a4ba3 in dri2_init_screen (sPriv=0xf04be0) at 
../../../../../src/gallium/state_trackers/dri/dri2.c:2066
#21 0xb669fef8 in driCreateNewScreen2 (scrn=0, fd=11, 
extensions=0xb7233220, driver_extensions=0xb6ed0100 
<galliumdrm_driver_extensions>, driver_configs=0xed5d70, data=0xed5c70) 
at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:151
#22 0xb7228ef5 in ?? () from /usr/lib/i386-linux-gnu/libgbm.so.1
#23 0xb7229230 in ?? () from /usr/lib/i386-linux-gnu/libgbm.so.1
#24 0xb7226cd8 in gbm_create_device () from 
/usr/lib/i386-linux-gnu/libgbm.so.1
#25 0xb724ab04 in glamor_egl_init (scrn=0xed21c0, fd=11) at 
../../../../../../glamor/glamor_egl.c:764
#26 0xb731efef in ?? () from /usr/lib/xorg/modules/drivers/radeon_drv.so
#27 0xb7310b14 in ?? () from /usr/lib/xorg/modules/drivers/radeon_drv.so
#28 0x004ee677 in InitOutput (pScreenInfo=<optimized out>, 
argc=<optimized out>, argv=<optimized out>) at 
../../../../../../hw/xfree86/common/xf86Init.c:583
#29 0x004aab81 in dix_main (argc=8, argv=0xbf93a084, envp=0xbf93a0a8) at 
../../../../dix/main.c:197
#30 0x0049423a in main (argc=8, argv=0xbf93a084, envp=0xbf93a0a8) at 
../../../../dix/stubmain.c:34
```

Please find the full backtrace attached.


Kind regards,

Paul
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