Bug 160864

I did end up starting in safe mode per recommendation, wiping the profile new, and was able to again reproduce this behavior even in safe mode.

Thank you for the report.
Do you reproduce the same issue:
- in LO 24.2.3?
- when using other VCL plugins?
For example:

SAL_USE_VCLPLUGIN=kf5 libreoffice24.2

or 

SAL_USE_VCLPLUGIN=gen libreoffice24.2

or

SAL_USE_VCLPLUGIN=gtk3 libreoffice24.2

Created attachment 194243 [details]
strace soffice --writer 2>2-writer-24-2-3-2-freeze.txt output

Created attachment 194244 [details]
strace soffice --safe-mode --writer 2>2-safe-mode-writer-24-2-3-2.txt output

Having same issue.

LibreOffice version information:
Version: 24.2.3.2 (X86_64) / LibreOffice Community
Build ID: 420(Build:2)
CPU threads: 8; OS: Linux 6.9; UI render: default; VCL: kf6 (cairo+xcb)
Locale: et-EE (et_EE.UTF-8); UI: et-EE
24.2.3-3
Calc: threaded

But when downloaded an AppImage version https://appimages.libreitalia.org/LibreOffice-fresh.full.help-x86_64.AppImage, then that issue is gone:
Version: 24.2.3.2 (X86_64) / LibreOffice Community
Build ID: 433d9c2ded56988e8a90e6b2e771ee4e6a5ab2ba
CPU threads: 8; OS: Linux 6.9; UI render: default; VCL: kf5 (cairo+xcb)
Locale: et-EE (et_EE.UTF-8); UI: et-EE
Calc: threaded

Tested also https://appimages.libreitalia.org/daily/LibreOfficeDev-24.8.0.0.alpha0.basic-x86_64.AppImage and also there is issue gone.
Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: abdb93ce28febd7c4b4e5dad164ee8a394b499b9
CPU threads: 8; OS: Linux 6.9; UI render: default; VCL: kf5 (cairo+xcb)
Locale: et-EE (et_EE.UTF-8); UI: en-US
Calc: threaded

it seems to be KDE Frameworks (kf) version issue: kf5 vs kf6.

Used system:
KDE 6.0.4
KDE Frameworks 6.2.0
Qt 6.7.0
Kernel 6.9.1
Display server: X11
GPU: nVidia Quadro M2000M/PCIe/SSE2

inxi -xxxGz
Graphics:
  Device-1: NVIDIA GM107GLM [Quadro M2000M] vendor: Lenovo driver: nvidia
    v: 550.78 arch: Maxwell pcie: speed: 2.5 GT/s lanes: 16 ports: active: none
    off: eDP-1 empty: DP-1,DP-2,DP-3 bus-ID: 01:00.0 chip-ID: 10de:13b0
    class-ID: 0300
  Device-2: Lite-On Integrated Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 bus-ID: 1-8:2 chip-ID: 04ca:7058 class-ID: 0e02
  Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.0
    compositor: kwin_x11 driver: X: loaded: nvidia unloaded: modesetting
    alternate: fbdev,nouveau,nv,vesa gpu: nvidia,nvidia-nvswitch
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 143 s-size: 341x191mm (13.43x7.52")
    s-diag: 391mm (15.39")
  Monitor-1: eDP-1 mapped: DP-4 note: disabled model: LG Display 0x054f
    res: 1920x1080 hz: 60 dpi: 142 size: 344x194mm (13.54x7.64")
    diag: 395mm (15.5") modes: 1920x1080
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
    drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia x11: drv: nvidia
    inactive: wayland,device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.78
    glx-v: 1.4 direct-render: yes renderer: Quadro M2000M/PCIe/SSE2
  API: Vulkan v: 1.3.279 layers: 1 surfaces: xcb,xlib device: 0
    type: discrete-gpu driver: nvidia device-ID: 10de:13b0

Tested:
SAL_USE_VCLPLUGIN=kf5 libreoffice --writer

... and still Help->About shows the use of kf6 and freezing issue persisted:
Version: 24.2.3.2 (X86_64) / LibreOffice Community
Build ID: 420(Build:2)
CPU threads: 8; OS: Linux 6.9; UI render: default; VCL: kf6 (cairo+xcb)
Locale: et-EE (et_EE.UTF-8); UI: et-EE
24.2.3-3
Calc: threaded


But when used:
SAL_USE_VCLPLUGIN=gen libreoffice --writer

then no freezing issue anymore, program info showed (also LibreOffice menus were instead of system one):
Version: 24.2.3.2 (X86_64) / LibreOffice Community
Build ID: 420(Build:2)
CPU threads: 8; OS: Linux 6.9; UI render: default; VCL: x11
Locale: et-EE (et_EE.UTF-8); UI: et-EE
24.2.3-3
Calc: threaded

The freeze with kf6 is most likely the issue described in tdf#160565 (and fixed in the current development version of LibreOffice).

-> Closing as duplicate

For auto-recovery not working as expected: Please create a separate bug report if that is still an issue with a version containing the above fix - it sounds like a separate issue.

*** This bug has been marked as a duplicate of bug 160565 ***

Sorry for the late response, but yes, I can confirm using "SAL_USE_VCLPLUGIN=gen libreoffice" does let saving work without freezing, and as well auto-save seems to be working as well to restore unsaved files. This was after an upgrade to Plasma 6 as well in Arch.

Only weirdness I'm seeing using SAL_USE_VCLPLUGIN=gen is still with autosave, in that if I have two files opened, and unsaved file with change, and a saved file without changes, hard killing the app and restarting it, it only wants to recover and reopen the unsaved file, and does NOT reopen the saved file. 

In the past as long as I can remember, it has always reopened both saved AND unsaved files after a crash/kill, so not sure if this is somehow related to the kf6 issue, or some other random behavior now changed.

(In reply to Mike Butash from comment #8)
> In the past as long as I can remember, it has always reopened both saved AND
> unsaved files after a crash/kill, so not sure if this is somehow related to
> the kf6 issue, or some other random behavior now changed.
This is unrelated and was done on purpose, please see bug 160769.