Created attachment 83559 [details]
Xorg log

Hit this problem with the latest version of radeonsi in Mesa with Fedora 19. Pulled the latest from git and built myself, and still hit the same issue. Removing radeonsi_dri.so and using radeon_dri.so allows me to work around the problem.

Relevant lspci:
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 9900 (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. Device 1527
	Flags: bus master, fast devsel, latency 0, IRQ 52
	Memory at b0000000 (32-bit, prefetchable) [size=256M]
	I/O ports at f000 [size=256]
	Memory at feb00000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Root Complex Integrated Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea LP [Radeon HD 7730M] (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. Device 1527
	Physical Slot: 0
	Flags: bus master, fast devsel, latency 0, IRQ 53
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at fea00000 (64-bit, non-prefetchable) [size=256K]
	I/O ports at e000 [size=256]
	Expansion ROM at fea40000 [disabled] [size=128K]
	Capabilities: [50] Power Management version 3
	Capabilities: [58] Express Legacy Endpoint, MSI 00
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+


The stack trace:

[ 72427.843] (EE) Backtrace:
[ 72427.843] (EE) 0: /usr/bin/Xorg (OsLookupColor+0x129) [0x46edb9]
[ 72427.844] (EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x34e180ef9f]
[ 72427.844] (EE) 2: /usr/lib64/dri/radeonsi_dri.so (radeon_drm_winsys_create+0xb9) [0x7fbab6804019]
[ 72427.845] (EE) 3: /usr/lib64/dri/radeonsi_dri.so (create_screen+0x9) [0x7fbab652b3d9]
[ 72427.846] (EE) 4: /usr/lib64/dri/radeonsi_dri.so (dri2_init_screen+0x45) [0x7fbab67fff75]
[ 72427.846] (EE) 5: /usr/lib64/dri/swrast_dri.so (driIndexConfigAttrib+0x57d) [0x7fbab3f9a7cd]
[ 72427.847] (EE) 6: /usr/lib64/xorg/modules/extensions/libglx.so (_glthread_GetID+0x71d1) [0x7fbab8162cb1]
[ 72427.848] (EE) 7: /usr/lib64/xorg/modules/extensions/libglx.so (_glthread_GetID+0x679a) [0x7fbab816180a]
[ 72427.848] (EE) 8: /usr/bin/Xorg (InitExtensions+0x41) [0x4ba101]
[ 72427.848] (EE) 9: /usr/bin/Xorg (_init+0x38e0) [0x429980]
[ 72427.848] (EE) 10: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x34e1021b75]
[ 72427.849] (EE) 11: /usr/bin/Xorg (_start+0x29) [0x4267b1]
[ 72427.849] (EE) 12: ? (?+0x29) [0x29]
[ 72427.849] (EE) 
[ 72427.849] (EE) Segmentation fault at address 0x0

Full Xorg log including the stack trace attached.