Test Case
=========
For example, this Bionic Server VM:
$ uvt-simplestreams-libvirt sync release=bionic arch=amd64
$ uvt-kvm create --memory 2048 --cpu 2 --disk 8 bionic-lp1794292
release=bionic arch=amd64
$ uvt-kvm ssh bionic-lp1794292
It has a virtual Cirrus VGA adapter:
$ lspci | grep VGA
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
Install its DRM module, which should not load by default:
$ sudo apt-get -y install linux-modules-extra-$(uname -r)
$ echo 'blacklist cirrus' | sudo tee
/etc/modprobe.d/blacklist-cirrus.conf
Update GRUB to use the default console (remove 'console=' options)
$ sudo vim /etc/default/grub /etc/default/grub.d/*
$ sudo update-grub
$ sudo reboot
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-47-generic
root=UUID=d7976e5d-71dc-4f7e-82d6-a2c292e0975e ro quiet splash vt.handoff=1
Upon boot, only the FB device is availble, not DRI/DRM:
$ ls -l /dev/fb0
crw-rw---- 1 root video 29, 0 Apr 10 22:43 /dev/fb0
$ ls -l /dev/dri
ls: cannot access '/dev/dri': No such file or directory
The modules exist but are not loaded:
$ lspci -s 00:02.0 -k
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Kernel modules: cirrusfb, cirrus
$ lsmod | grep cirrus
$
This is the test case. Essentially:
1) start plymouthd
2) wait the default device timeout (5 seconds), so it detects '/dev/fb0'
3) show splash, so it activates keyboard
4) load module, so it detects '/dev/dri/card0'
5) deactivate, so it deactivates keyboard and segfaults (or not)
Give it a little time between each command to process events.
sudo plymouthd --no-daemon --debug --kernel-command-line=splash &
sleep 10
sudo plymouth --show-splash
sleep 10
sudo modprobe cirrus
sleep 10
sudo plymouth deactivate
<segfaults in a few seconds>
With the same stack trace:
#0 0x00007fdf0ef68f09 in ply_renderer_set_handler_for_input_source
(renderer=<optimized out>, input_source=0x5636eaefc2a0, handler=0x0,
user_data=0x0) at ply-renderer.c:406
#1 0x00007fdf0ef62cbf in ply_keyboard_stop_watching_for_renderer_input
(keyboard=0x5636eaefc6a0) at ply-keyboard.c:319
#2 ply_keyboard_stop_watching_for_input
(keyboard=keyboard@entry=0x5636eaefc6a0) at ply-keyboard.c:406
#3 0x00007fdf0ef6221b in ply_device_manager_deactivate_keyboards
(manager=0x5636eaeff6d0) at ply-device-manager.c:976
#4 0x00005636e92d3ec3 in on_deactivate (state=0x7fff1c458390,
deactivate_trigger=<optimized out>) at main.c:1361
#5 0x00005636e92cdb9b in ply_boot_connection_on_request
(connection=0x5636eaf12360) at ply-boot-server.c:504
#6 0x00007fdf0f177fbe in ply_event_loop_handle_met_status_for_source
(status=<optimized out>, source=0x5636eaf11970, loop=0x5636eaefa3a0) at
ply-event-loop.c:1034
#7 ply_event_loop_process_pending_events
(loop=loop@entry=0x5636eaefa3a0) at ply-event-loop.c:1279
#8 0x00007fdf0f178480 in ply_event_loop_run (loop=0x5636eaefa3a0) at
ply-event-loop.c:1310
#9 0x00005636e92cb514 in main (argc=4, argv=0x7fff1c459588) at
main.c:2398
The version in -proposed does not have these lines in the module load
step.
[ply-device-manager.c:345]
on_udev_event:got remove event for device fb0
[ply-renderer.c:92]
ply_renderer_free:Unloading renderer backend plugin
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1794292
Title:
plymouthd crashed with SIGSEGV in /sbin/plymouthd:11 in
ply_renderer_set_handler_for_input_source ->
ply_keyboard_stop_watching_for_renderer_input ->
ply_keyboard_stop_watching_for_input ->
ply_device_manager_deactivate_keyboards -> on_deactivate
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1794292/+subscriptions
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