Bug 1573675

Created attachment 1429604 [details]
Xorg.1.log

Description of problem: On both kernel 4.16.4-200.fc27.x86_64 and 4.16.5-200.fc27.x86_64 Xorg crashes immediately upon login, and the console is left garbled and in an unusable state. Graphics card is an AMD Vega 64.


Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.19.6-7.fc27.x86_64
xorg-x11-drv-amdgpu-18.0.1-1.fc27.x86_64


How reproducible: Select an Xorg session from the GDM menu, log in.


Steps to Reproduce:
1. Select and Xorg session from the GDM pulldown menu
2. Enter password
3. Log in


Additional info: Bug was introduced with kernel 4.16.4-200, the previous kernel update (4.16.3-200) is not affected. A Wayland session is not affected on any of these kernels. 

Relevant snippets from Xorg.1.log (full log included as attachment):

[    41.483] (EE) AMDGPU(0): failed to set mode: Invalid argument
[    41.483] (WW) AMDGPU(0): Failed to set mode on CRTC 0
[    41.483] (EE) AMDGPU(0): Failed to enable any CRTC


[    41.519] (EE) AMDGPU(0): Failed to allocate scanout buffer memory
[    41.519] (EE) AMDGPU(0): Failed to allocate scanout buffer memory
[    41.519] (EE) AMDGPU(0): failed to set mode: Invalid argument


[    55.548] (EE) 
[    55.548] (EE) Backtrace:
[    55.549] (EE) 0: /usr/libexec/Xorg (OsLookupColor+0x139) [0x59d609]
[    55.549] (EE) 1: /lib64/libpthread.so.0 (funlockfile+0x50) [0x7f93bfea21ff]
[    55.549] (EE) 2: /usr/lib64/xorg/modules/drivers/amdgpu_drv.so (_init+0x11495) [0x7f93bca858f5]
[    55.550] (EE) 3: /usr/lib64/xorg/modules/drivers/amdgpu_drv.so (_init+0xa4d6) [0x7f93bca77c26]
[    55.550] (EE) 4: /usr/libexec/Xorg (present_extension_init+0x1208) [0x51ab68]
[    55.550] (EE) 5: /usr/libexec/Xorg (present_event_notify+0x877) [0x51aa77]
[    55.550] (EE) 6: /usr/libexec/Xorg (present_register_complete_notify+0x101a) [0x51cd4a]
[    55.550] (EE) 7: /usr/libexec/Xorg (SendErrorToClient+0x368) [0x435928]
[    55.550] (EE) 8: /usr/libexec/Xorg (InitFonts+0x420) [0x439950]
[    55.552] (EE) 9: /lib64/libc.so.6 (__libc_start_main+0xea) [0x7f93bfafaf2a]
[    55.552] (EE) 10: /usr/libexec/Xorg (_start+0x2a) [0x4235fa]
[    55.552] (EE) 
[    55.552] (EE) Segmentation fault at address 0x10
[    55.552] (EE) 
Fatal server error:
[    55.552] (EE) Caught signal 11 (Segmentation fault). Server aborting
[    55.552] (EE) 
[    55.552] (EE) 
Please consult the Fedora Project support 
         at http://wiki.x.org
 for help. 
[    55.552] (EE) Please also check the log file at "/home/user/.local/share/xorg/Xorg.1.log" for additional information.
[    55.552] (EE) 
[    55.552] (II) AIGLX: Suspending AIGLX clients for VT switch
[    55.559] (EE) Server terminated with error (1). Closing log file.