[arch-general] sddm crashing with plasma

[Lukas Jirkovsky]

On 21 September 2015 at 14:53, Genes Lists <lists at sapience.com> 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 ]---