The problem is "preferred" being accessed unconditionally. All the other usages are covered by a check of "preferred", so I added it. Now it works again.
Chia-Lin Kao (AceLan) should double check, as it is his patch. Commented in his upstream MR: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/993 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1999852 Title: xserver-xorg-core_21.1.3-2ubuntu2.5 segfaults Status in xorg-server package in Ubuntu: New Bug description: Running xserver-xorg-core_21.1.3-2ubuntu2.3_amd64.deb was fine. Since the recent update to xserver-xorg-core_21.1.3-2ubuntu2.5_amd64.deb Xorg always segfaults at startup. Going back to xserver-xorg-core_21.1.3-2ubuntu2.3_amd64.deb works again. (Tried it multiple times and it is reproducable.) The errors from the last Xorg.log: [ 54.562] (EE) Backtrace: [ 54.563] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x560707b09719] [ 54.564] (EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (__sigaction+0x50) [0x7f40658cd520] [ 54.564] (EE) 2: /usr/lib/xorg/Xorg (xf86ModeVRefresh+0x4) [0x560707a0e724] [ 54.565] (EE) unw_get_proc_name failed: no unwind info found [-10] [ 54.565] (EE) 3: /usr/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x7f406513b9b0] [ 54.565] (EE) 4: /usr/lib/xorg/Xorg (xf86ProbeOutputModes+0x147) [0x560707a07e47] [ 54.565] (EE) 5: /usr/lib/xorg/Xorg (xf86InitialConfiguration+0x191) [0x560707a089b1] [ 54.565] (EE) unw_get_proc_name failed: no unwind info found [-10] [ 54.565] (EE) 6: /usr/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x7f406513f07c] [ 54.566] (EE) unw_get_proc_name failed: no unwind info found [-10] [ 54.566] (EE) 7: /usr/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x7f40651374bf] [ 54.566] (EE) 8: /usr/lib/xorg/Xorg (InitOutput+0xb8b) [0x5607079d73ab] [ 54.566] (EE) 9: /usr/lib/xorg/Xorg (InitFonts+0x1dc) [0x56070799734c] [ 54.567] (EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_init_first+0x90) [0x7f40658b4d90] [ 54.567] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0x80) [0x7f40658b4e40] [ 54.568] (EE) 12: /usr/lib/xorg/Xorg (_start+0x25) [0x560707980605] [ 54.568] (EE) [ 54.568] (EE) Segmentation fault at address 0xa8 [ 54.568] (EE) Fatal server error: [ 54.568] (EE) Caught signal 11 (Segmentation fault). Server aborting [ 54.568] (EE) [ 54.568] (EE) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1999852/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
