Arch Linux

Description:

xorg crashes when started:

17.026] (EE) Backtrace:
[ 17.027] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x4d) [0x5626350b176d]
[ 17.027] (EE) 1: /usr/lib/Xorg (0x562634ffe000+0xa9cf8) [0x5626350a7cf8]
[ 17.027] (EE) 2: /usr/lib/libc.so.6 (0x7fcd8467e000+0x3bd70) [0x7fcd846b9d70]
[ 17.027] (EE) 3: /usr/lib/dri/r600_dri.so (0x7fcd81895000+0x521044) [0x7fcd81db6044]
[ 17.027] (EE) 4: /usr/lib/dri/r600_dri.so (0x7fcd81895000+0x533b56) [0x7fcd81dc8b56]
[ 17.027] (EE) 5: /usr/lib/dri/r600_dri.so (0x7fcd81895000+0x51ea44) [0x7fcd81db3a44]
[ 17.027] (EE) 6: /usr/lib/dri/r600_dri.so (0x7fcd81895000+0x51fbe3) [0x7fcd81db4be3]
[ 17.027] (EE) 7: /usr/lib/dri/r600_dri.so (0x7fcd81895000+0xed29d) [0x7fcd8198229d]
[ 17.027] (EE) 8: /lib64/ld-linux-x86-64.so.2 (0x7fcd848df000+0x1109a) [0x7fcd848f009a]
[ 17.027] (EE) 9: /lib64/ld-linux-x86-64.so.2 (0x7fcd848df000+0x111a1) [0x7fcd848f01a1]
[ 17.027] (EE) 10: /usr/lib/libc.so.6 (_dl_catch_exception+0xe5) [0x7fcd847b7905]
[ 17.027] (EE) 11: /lib64/ld-linux-x86-64.so.2 (0x7fcd848df000+0x15504) [0x7fcd848f4504]
[ 17.027] (EE) 12: /usr/lib/libc.so.6 (_dl_catch_exception+0x88) [0x7fcd847b78a8]
[ 17.027] (EE) 13: /lib64/ld-linux-x86-64.so.2 (0x7fcd848df000+0x1496e) [0x7fcd848f396e]
[ 17.027] (EE) 14: /usr/lib/libdl.so.2 (0x7fcd84489000+0x134c) [0x7fcd8448a34c]
[ 17.027] (EE) 15: /usr/lib/libc.so.6 (_dl_catch_exception+0x88) [0x7fcd847b78a8]
[ 17.027] (EE) 16: /usr/lib/libc.so.6 (_dl_catch_error+0x33) [0x7fcd847b7973]
[ 17.027] (EE) 17: /usr/lib/libdl.so.2 (0x7fcd84489000+0x1ab9) [0x7fcd8448aab9]
[ 17.027] (EE) 18: /usr/lib/libdl.so.2 (dlopen+0x4a) [0x7fcd8448a3da]
[ 17.027] (EE) 19: /usr/lib/libgbm.so.1 (0x7fcd838e9000+0x62c0) [0x7fcd838ef2c0]
[ 17.027] (EE) 20: /usr/lib/libgbm.so.1 (0x7fcd838e9000+0x5097) [0x7fcd838ee097]
[ 17.027] (EE) 21: /usr/lib/libgbm.so.1 (0x7fcd838e9000+0x552c) [0x7fcd838ee52c]
[ 17.027] (EE) 22: /usr/lib/libgbm.so.1 (gbm_create_device+0x59) [0x7fcd838ec1c9]
[ 17.027] (EE) 23: /usr/lib/xorg/modules/libglamoregl.so (glamor_egl_init+0x53) [0x7fcd831831e3]
[ 17.027] (EE) 24: /usr/lib/xorg/modules/drivers/modesetting_drv.so (0x7fcd838fa000+0x11c0b) [0x7fcd8390bc0b]
[ 17.027] (EE) 25: /usr/lib/Xorg (InitOutput+0x1422) [0x562635094422]
[ 17.027] (EE) 26: /usr/lib/Xorg (0x562634ffe000+0x38503) [0x562635036503]
[ 17.027] (EE) 27: /usr/lib/libc.so.6 (__libc_start_main+0xf3) [0x7fcd846a5023]
[ 17.027] (EE) 28: /usr/lib/Xorg (_start+0x2e) [0x5626350373be]
[ 17.027] (EE)
[ 17.027] (EE) Illegal instruction at address 0x7fcd81db6044
[ 17.027] (EE)
Fatal server error:
[ 17.027] (EE) Caught signal 4 (Illegal instruction). Server aborting
[ 17.027] (EE)


Additional info:
can be reproduced with graphics card [AMD/ATI] RS780L [Radeon 3000], not reproduceable with Intel or Nvidia here.

Steps to reproduce:
simple start x-server.