X fails to start; may be due to recent ports updates...?

[J. Altman]

Greetings, list....

Below, please find Xorg log for the recurring error message. This occurs
consistently; with or without loading radeon via rc.conf; and no updates
since early Saturday, February 11, EDT, seem to remedy the situation. It
appears to be related to a bug reported elsewhere, where X or the window
manager fails to start; but I could be wrong.

That said, to where should I post this...-bugs or -x11?

==Begin error===
<snip to KMS loading; everything else in the log is normal>

[ 53067.674] (II) [KMS] Kernel modesetting enabled.
[ 53067.675] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 53067.675] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
[ 53067.675] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
[ 53067.675] (==) RADEON(0): Default visual is TrueColor
[ 53067.675] (==) RADEON(0): RGB weight 888
[ 53067.675] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
[ 53067.675] (--) RADEON(0): Chipset: "ATI Mobility Radeon HD 5000 Series" (ChipID = 0x68e0)
[ 53067.675] (II) Loading sub module "fb"
[ 53067.675] (II) LoadModule: "fb"
[ 53067.675] (II) Loading /usr/local/lib/xorg/modules/libfb.so
[ 53067.676] (II) Module fb: vendor="X.Org Foundation"
[ 53067.676] 	compiled for 1.18.4, module version = 1.0.0
[ 53067.676] 	ABI class: X.Org ANSI C Emulation, version 0.4
[ 53067.676] (II) Loading sub module "dri2"
[ 53067.676] (II) LoadModule: "dri2"
[ 53067.676] (II) Module "dri2" already built-in
[ 53067.676] (II) Loading sub module "glamoregl"
[ 53067.676] (II) LoadModule: "glamoregl"
[ 53067.676] (II) Loading /usr/local/lib/xorg/modules/libglamoregl.so
[ 53067.699] (II) Module glamoregl: vendor="X.Org Foundation"
[ 53067.699] 	compiled for 1.18.4, module version = 1.0.0
[ 53067.699] 	ABI class: X.Org ANSI C Emulation, version 0.4
[ 53067.699] (II) glamor: OpenGL accelerated X.org driver based.
[ 53068.111] (EE) 
[ 53068.111] (EE) Backtrace:
[ 53068.115] (EE) 0: /usr/local/bin/X (OsInit+0x38a) [0x59d6ca]
[ 53068.118] (EE) 1: /lib/libthr.so.3 (_pthread_sigmask+0x507) [0x802b42f67]
[ 53068.122] (EE) 2: /lib/libthr.so.3 (_pthread_getspecific+0xe1c) [0x802b42f0c]
[ 53068.126] (EE) 3: ? (?+0xe1c) [0x7ffffffffe1f]
[ 53068.131] (EE) 4: /usr/local/llvm39/lib/libLLVM-3.9.so (_ZN4llvm13StringMapImpl15LookupBucketForENS_9StringRefE+0x7d) [0x8092aee6d]
[ 53068.135] (EE) 5: /usr/local/llvm39/lib/libLLVM-3.9.so (_ZNSt3__16vectorIPN4llvm2cl14OptionCategoryENS_9allocatorIS4_EEE21__push_back_slow_pathIS4_EEvOT_+0x22f) [0x8092823cf]
[ 53068.140] (EE) 6: /usr/local/llvm39/lib/libLLVM-3.9.so (LLVMParseCommandLineOptions+0x1c2c) [0x80928063c]
[ 53068.144] (EE) 7: /usr/local/llvm39/lib/libLLVM-3.9.so (_ZN4llvm2cl6Option11addArgumentEv+0x7c) [0x80927434c]
[ 53068.149] (EE) 8: /usr/local/llvm36/lib/libLLVM-3.6.so (_ZN4llvm32createPPCTargetTransformInfoPassEPKNS_16PPCTargetMachineE+0xc12) [0x80e1e2794]
[ 53068.153] (EE) 9: /usr/local/llvm36/lib/libLLVM-3.6.so (_ZN4llvm16SparcInstPrinter20printSparcAliasInstrEPKNS_6MCInstERNS_11raw_ostreamE+0x432) [0x80e1fef74]
[ 53068.158] (EE) 10: /usr/local/llvm36/lib/libLLVM-3.6.so (_init+0xe) [0x80d22313c]
[ 53068.162] (EE) 11: ? (_rtld_is_dlopened+0x19e7) [0x800809e1e]
[ 53068.165] (EE) 12: ? (dlopen+0x190) [0x800805030]
[ 53068.169] (EE) 13: /usr/local/lib/libgbm.so.1 (gbm_surface_has_free_buffers+0xfda) [0x8077df75a]
[ 53068.173] (EE) 14: /usr/local/lib/libgbm.so.1 (gbm_surface_has_free_buffers+0xc1b) [0x8077df0ab]
[ 53068.177] (EE) 15: /usr/local/lib/libgbm.so.1 (gbm_surface_has_free_buffers+0x121) [0x8077dd9d1]
[ 53068.181] (EE) 16: /usr/local/lib/libgbm.so.1 (gbm_create_device+0x38) [0x8077dd628]
[ 53068.185] (EE) 17: /usr/local/lib/xorg/modules/libglamoregl.so (glamor_egl_init+0x82) [0x8075b1432]
[ 53068.189] (EE) 18: /usr/local/lib/xorg/modules/drivers/radeon_drv.so (_init+0x4d682) [0x806d94e82]
[ 53068.193] (EE) 19: /usr/local/lib/xorg/modules/drivers/radeon_drv.so (_init+0x406f5) [0x806d7a985]
[ 53068.197] (EE) 20: /usr/local/bin/X (InitOutput+0x9af) [0x47bb0f]
[ 53068.201] (EE) 21: /usr/local/bin/X (remove_fs_handlers+0x2e7) [0x439db7]
[ 53068.204] (EE) 22: /usr/local/bin/X (_start+0x16f) [0x42501f]
[ 53068.208] (EE) 23: ? (?+0x16f) [0x80082616f]
[ 53068.208] (EE) 
[ 53068.208] (EE) Segmentation fault at address 0x0
[ 53068.208] (EE) 
Fatal server error:
[ 53068.208] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 53068.209] (EE) 
[ 53068.209] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[ 53068.209] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 53068.209] (EE) 
[ 53068.209] (EE) Server terminated with error (1). Closing log file.

===End error===

This is with my user account, employing windowmaker; with root, XFCE
fails in a similar manner, and on one occasion dumped core. No core
dumps with the user account. Other than this, I have no clue.

Thanks for any help,

Joe