On 21 September 2015 at 14:53, Genes Lists <lists@xxxxxxxxxxxx> wrote: > Anyone else seeing this - started after systemd 226 update. It starts > sometimes - most often crashes on warm reboot - cold reboot seems more > likely to work. Feels like a threading bug (missing mutex somewhere, or a > barrier or something). > > Symptom: Reboot - sddm won't start. > Log: > ddm-helper[4240]: segfault at 14 ip 000000000042965e sp 00007ffdec4eb3b0 > error 4 in sddm-helper[400000+3a000] > > Rebooting cold - will usually get it running again with no errors. I seem to have the same problem - sddm hardly ever starts. I've downgraded systemd back to 225 at my system started fine, I will see whether the problem has disappeared completely. Also, I have the following in my dmesg: Sep 21 18:29:42 black-dragon kernel: ------------[ cut here ]------------ Sep 21 18:29:42 black-dragon kernel: WARNING: CPU: 0 PID: 340 at drivers/gpu/drm/i915/i915_gem.c:5269 i915_gem_track_fb+0x129/0x140 [i915]() Sep 21 18:29:42 black-dragon kernel: WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits)) Sep 21 18:29:42 black-dragon kernel: Modules linked in: Sep 21 18:29:42 black-dragon kernel: sha256_ssse3 sha256_generic hmac drbg ansi_cprng ctr ccm msr uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media mousedev coretemp kvm_intel iTCO_wdt iTCO_vendor_support kvm arc4 evdev iwldvm snd_hda_codec_hdmi input_leds psmouse pcspkr mac80211 i Sep 21 18:29:42 black-dragon kernel: libata scsi_mod i8042 serio ehci_pci uhci_hcd ehci_hcd usbcore usb_common Sep 21 18:29:42 black-dragon kernel: CPU: 0 PID: 340 Comm: Xorg Tainted: G W 4.2.0-4-ARCH #1 Sep 21 18:29:42 black-dragon kernel: Hardware name: ASUSTeK Computer Inc. UL30A /UL30A , BIOS 212 12/28/2009 Sep 21 18:29:42 black-dragon kernel: 0000000000000000 0000000043d41a44 ffff8800b5783a08 ffffffff8156b4fa Sep 21 18:29:42 black-dragon kernel: 0000000000000000 ffff8800b5783a60 ffff8800b5783a48 ffffffff81074846 Sep 21 18:29:42 black-dragon kernel: ffff88013a2a9000 0000000000000010 0000000000000000 ffff8800b979a000 Sep 21 18:29:42 black-dragon kernel: Call Trace: Sep 21 18:29:42 black-dragon kernel: [<ffffffff8156b4fa>] dump_stack+0x4c/0x6e Sep 21 18:29:42 black-dragon kernel: [<ffffffff81074846>] warn_slowpath_common+0x86/0xc0 Sep 21 18:29:42 black-dragon kernel: [<ffffffff810748d5>] warn_slowpath_fmt+0x55/0x70 Sep 21 18:29:42 black-dragon kernel: [<ffffffffa03e2bf9>] i915_gem_track_fb+0x129/0x140 [i915] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa04223c9>] intel_begin_crtc_commit+0x99/0x1b0 [i915] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa0373f35>] drm_atomic_helper_commit_planes_on_crtc+0x55/0x250 [drm_kms_helper] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa043c26b>] intel_atomic_commit+0x6b/0x100 [i915] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02d5bf7>] drm_atomic_commit+0x37/0x60 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa037434f>] drm_atomic_helper_disable_plane+0xef/0x130 [drm_kms_helper] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02d45c9>] ? drm_modeset_lock+0x39/0xe0 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02c5a8a>] __setplane_internal+0x23a/0x2f0 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02d4d52>] ? __drm_modeset_lock_all+0x112/0x140 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02c93a6>] drm_mode_setplane+0x136/0x1b0 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02ba575>] drm_ioctl+0x125/0x610 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffffa02c9270>] ? drm_plane_check_pixel_format+0x50/0x50 [drm] Sep 21 18:29:42 black-dragon kernel: [<ffffffff8118a3cc>] ? handle_mm_fault+0xc8c/0x18b0 Sep 21 18:29:42 black-dragon kernel: [<ffffffff811e2905>] do_vfs_ioctl+0x295/0x480 Sep 21 18:29:42 black-dragon kernel: [<ffffffff811ec9f7>] ? __fget+0x77/0xb0 Sep 21 18:29:42 black-dragon kernel: [<ffffffff811e2b69>] SyS_ioctl+0x79/0x90 Sep 21 18:29:42 black-dragon kernel: [<ffffffff81570a6e>] entry_SYSCALL_64_fastpath+0x12/0x71 Sep 21 18:29:42 black-dragon kernel: ---[ end trace 13038e6396648662 ]---
