[Bug 1794292] Re: 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

[Gert van de Kraats]

Same problem as described before.
To force I use timeout 1 and theme fade-in. But same problem also occurred at my PC with the default timeout 5, as was on the trace.
I will upload the crashdump (which by default was ignored by apport).
Routine ply_renderer_free does a hard free of renderer. So renderer cannot be referenced later at deactivation of keyboard, because the memory might be overwritten. 
I wrote a routine which shlould be called before ply_renderer_free:
void
ply_device_manager_deactivate_keyboard (ply_device_manager_t *manager,
                            ply_renderer_t       *renderer)
{
        ply_list_node_t *node;

        node = ply_list_get_first_node (manager->keyboards);
        while (node != NULL) {
                ply_keyboard_t *keyboard;
                ply_list_node_t *next_node;

                keyboard = ply_list_node_get_data (node);
                next_node = ply_list_get_next_node (manager->keyboards, node);
                if (ply_keyboard_get_renderer (keyboard) == renderer) {
                        ply_trace ("deactivating keyboard");
                        ply_keyboard_stop_watching_for_input (keyboard);
                        ply_list_remove_node (manager->keyboards, node);
                        break;
                }
                node = next_node;
        }

}

At ply-keyboard.c:
c
ply_renderer_t *
ply_keyboard_get_renderer (ply_keyboard_t              *keyboard)
{
        assert (keyboard != NULL);
        return keyboard->provider.if_renderer->renderer;
}



** Attachment added: "_sbin_plymouthd.0_33.crash.gz"
   https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1794292/+attachment/5210569/+files/_sbin_plymouthd.0_33.crash.gz

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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

Status in plymouth package in Ubuntu:
  Confirmed
Status in plymouth source package in Cosmic:
  Confirmed

Bug description:
  A green Xubuntu splash screen with a spinning circle normally appears
  on boot up.

  Now just a blank black screen shows until the login box appears. On
  logging in, the desktop appears as normal but an error message pops up
  offering to report a bug to developers.

  Description:	Ubuntu Cosmic Cuttlefish (development branch)
  Release:	18.10

  All packages up-to-date as of 25 September 2018 14:00 BST

  
  Errors Tracker: https://errors.ubuntu.com/problem/6aa06f1bc51946c787a01d38e58bc76114555334

  
  ProblemType: Crash
  DistroRelease: Ubuntu 18.10
  Package: plymouth 0.9.3-1ubuntu8
  ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5
  Uname: Linux 4.18.0-7-generic x86_64
  ApportVersion: 2.20.10-0ubuntu11
  Architecture: amd64
  CrashCounter: 1
  Date: Tue Sep 25 13:47:47 2018
  DefaultPlymouth: /usr/share/plymouth/themes/xubuntu-logo/xubuntu-logo.plymouth
  ExecutablePath: /sbin/plymouthd
  MachineType: Acer Veriton N280G
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-7-generic root=UUID=ff708f10-3fbc-4fa2-b7a5-93f0dd61eb21 ro splash quiet vt.handoff=1
  ProcCmdline: @sbin/plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
  ProcEnviron:
   LANG=en_GB.UTF-8
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-7-generic root=UUID=ff708f10-3fbc-4fa2-b7a5-93f0dd61eb21 ro splash quiet vt.handoff=1
  SegvAnalysis:
   Segfault happened at: 0x7f05452a07f9 <ply_renderer_set_handler_for_input_source+25>:	mov    0x78(%rax),%rax
   PC (0x7f05452a07f9) ok
   source "0x78(%rax)" (0x00000078) not located in a known VMA region (needed readable region)!
   destination "%rax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: plymouth
  StacktraceTop:
   ply_renderer_set_handler_for_input_source () from /lib/x86_64-linux-gnu/libply-splash-core.so.4
   ply_keyboard_stop_watching_for_input () from /lib/x86_64-linux-gnu/libply-splash-core.so.4
   ply_device_manager_deactivate_keyboards () from /lib/x86_64-linux-gnu/libply-splash-core.so.4
   ?? ()
   ?? ()
  TextPlymouth: /usr/share/plymouth/themes/xubuntu-text/xubuntu-text.plymouth
  Title: plymouthd crashed with SIGSEGV in ply_renderer_set_handler_for_input_source()
  UpgradeStatus: Upgraded to cosmic on 2018-08-21 (34 days ago)
  UserGroups:

  dmi.bios.date: 01/15/2011
  dmi.bios.vendor: Acer
  dmi.bios.version: P01-A3
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: TPDS03
  dmi.board.vendor: Acer
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Acer
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAcer:bvrP01-A3:bd01/15/2011:svnAcer:pnVeritonN280G:pvrToBeFilledByO.E.M.:rvnAcer:rnTPDS03:rvrTobefilledbyO.E.M.:cvnAcer:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: Acer Desktop
  dmi.product.name: Veriton N280G
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: Acer

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