[Mesa-dev] UDL & Modeset with Mesa 13.0.1 - Segmentation fault

[Emil Velikov]

On 17 November 2016 at 20:15, poma <pomidorabelisima at gmail.com> wrote:
>
> Airlie solved everything concerning the kernel,
> so it seems, now it's user space turn.
>
> = mesa-libgbm-12.0.3 - works OK
> ...
> [   714.429] (II) Loading sub module "glamoregl"
> [   714.429] (II) LoadModule: "glamoregl"
> [   714.430] (II) Loading /usr/lib64/xorg/modules/libglamoregl.so
> [   714.480] (II) Module glamoregl: vendor="X.Org Foundation"
> [   714.481]    compiled for 1.19.0, module version = 1.0.0
> [   714.481]    ABI class: X.Org ANSI C Emulation, version 0.4
> ...
> [   714.481] (II) glamor: OpenGL accelerated X.org driver based.
> [   714.633] (II) glamor: EGL version 1.4 (DRI2):
> [   714.633] EGL_MESA_drm_image required.
> [   714.634] (EE) modeset(0): glamor initialization failed
> [   714.634] (II) modeset(0): ShadowFB: preferred NO, enabled NO
> ...
> [   714.643] (==) Depth 24 pixmap format is 32 bpp
> [   714.645] (==) modeset(0): Backing store enabled
> [   714.645] (==) modeset(0): Silken mouse enabled
> [   714.645] (II) modeset(0): RandR 1.2 enabled, ignore the following RandR disabled message.
> [   714.646] (==) modeset(0): DPMS enabled
> [   714.646] (--) RandR disabled
> [   714.669] (II) AIGLX: Screen 0 is not DRI2 capable
> [   714.669] (EE) AIGLX: reverting to software rendering
> [   714.683] (II) IGLX: enabled GLX_MESA_copy_sub_buffer
> [   714.686] (II) IGLX: Loaded and initialized swrast
> [   714.686] (II) GLX: Initialized DRISWRAST GL provider for screen 0
> [   714.691] (II) modeset(0): Damage tracking initialized
> ...
>
> = mesa-libgbm-13.0.1 - not quite
> ...
> [  2324.953] (II) Loading sub module "glamoregl"
> [  2324.953] (II) LoadModule: "glamoregl"
> [  2324.953] (II) Loading /usr/lib64/xorg/modules/libglamoregl.so
> [  2325.000] (II) Module glamoregl: vendor="X.Org Foundation"
> [  2325.000]    compiled for 1.19.0, module version = 1.0.0
> [  2325.000]    ABI class: X.Org ANSI C Emulation, version 0.4
> ...
> [  2325.001] (II) glamor: OpenGL accelerated X.org driver based.
> [  2325.002] (EE)
> [  2325.002] (EE) Backtrace:
> [  2325.006] (EE) 0: /usr/libexec/Xorg (OsLookupColor+0x139) [0x59e389]
> [  2325.008] (EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x7f69d836ac2f]
> [  2325.009] (EE) 2: /lib64/libgbm.so.1 (gbm_surface_has_free_buffers+0x1505) [0x7f69d2b64685]
> [  2325.010] (EE) 3: /lib64/libgbm.so.1 (gbm_surface_has_free_buffers+0x1b98) [0x7f69d2b653b8]
> [  2325.011] (EE) 4: /lib64/libgbm.so.1 (gbm_surface_has_free_buffers+0x1498) [0x7f69d2b644c8]
> [  2325.012] (EE) 5: /lib64/libgbm.so.1 (gbm_create_device+0x4c) [0x7f69d2b61a4c]
> [  2325.014] (EE) 6: /usr/lib64/xorg/modules/libglamoregl.so (glamor_egl_init+0x83) [0x7f69d2d73fb3]
> [  2325.015] (EE) 7: /usr/lib64/xorg/modules/drivers/modesetting_drv.so (_init+0x4d21) [0x7f69d2facfd1]
> [  2325.016] (EE) 8: /usr/libexec/Xorg (InitOutput+0xa82) [0x47d6c2]
> [  2325.017] (EE) 9: /usr/libexec/Xorg (InitFonts+0x216) [0x43ae36]
> [  2325.020] (EE) 10: /lib64/libc.so.6 (__libc_start_main+0xf1) [0x7f69d7fb8731]
> [  2325.022] (EE) 11: /usr/libexec/Xorg (_start+0x29) [0x424d29]
> [  2325.024] (EE) 12: ? (?+0x29) [0x29]
> [  2325.025] (EE)
> [  2325.025] (EE) Segmentation fault at address 0xc
> [  2325.025] (EE)
> Fatal server error:
> [  2325.025] (EE) Caught signal 11 (Segmentation fault). Server aborting
> [  2325.026] (EE)
> [  2325.026] (EE)
> ...
> [  2325.027] (EE) Server terminated with error (1). Closing log file.
>
>
> A call to not load the module(s) is not at all useful:
> Section "Module"
>     Disable  "glx"
>     Disable  "glamoregl"
> EndSection
>
> ...
> (WW) "glx" will not be loaded unless you've specified it to be loaded elsewhere.
> (WW) "glamoregl" will not be loaded unless you've specified it to be loaded elsewhere.
> (II) "glx" will be loaded even though the default is to disable it.
> ...
> (II) Loading sub module "glamoregl"
> (II) LoadModule: "glamoregl"
> (II) Loading /usr/lib64/xorg/modules/libglamoregl.so
> (II) Module glamoregl: vendor="X.Org Foundation"
>         compiled for 1.19.0, module version = 1.0.0
>         ABI class: X.Org ANSI C Emulation, version 0.4
> (II) glamor: OpenGL accelerated X.org driver based.
> (EE)
> (EE) Backtrace:
> ...
>
> Therefore, until the issue resolved, there remain two workarounds:
> downgrade mesa to 12.0.3, what works
> OR
> leave mesa 13.0.1 and:
> # rm /usr/lib64/xorg/modules/libglamoregl.so
>
Is that with libdrm 2.4.72 or later ? Older ones are known to be
broken with non-pci devices.
Additionally ensure that your pthread-stubs package does _not_ have
the following commit/patch [1].

Thanks
Emil

[1] https://cgit.freedesktop.org/xcb/pthread-stubs/commit/?id=fa6db2f9c018c54a47e94c0175450303d700aa92