SUMMARY Krita crashes and file corrupts after closing the application in a span of a few minutes. I submitted this bug report because the 1 week of progress that I've made disappeared in a few minutes and this is my first time submitting bug report and I'm not that smart in this stuff STEPS TO REPRODUCE 1. Open krita 2. Open krita file. 3. Draw until has somewhat large file size or lags a tiny bit. 4. Close the krita application. 5. Wait for a few minutes. the longer the more it has possibility of crashing and file corruption (can't open the file again) 6. Open krita again. OBSERVED RESULT the good result is that krita only crashed or has a Autosave and if I waited a little bit longer the bad result is that the file can't be opened and krita considers it an invalid krita file and file format can't be parsed EXPECTED RESULT the file has an Autosave or file gets unusable Krita Version: 5.2.8 (git 7c43349) Hidpi: true Qt Version (compiled): 5.15.7 Version (loaded): 5.15.7 OS Information Build ABI: arm64-little_endian-lp64 Build CPU: arm64 CPU: arm64 Kernel Type: linux Kernel Version: 4.14.180-perf-g98d7380da Pretty Productname: Android (13.0) Product Type: android Product Version: 13.0 Product Model: Xiaomi 21051182G OpenGL Info Vendor: "Qualcomm" Renderer: "Adreno (TM) 640" Driver version: "OpenGL ES 3.2 V@0502.0 (GIT@83a0eede45, If3f4a1ab82, 1637303585) (Date:11/18/21)" Shading language: "OpenGL ES GLSL ES 3.20" Requested format: QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::NoProfile) Current format: QSurfaceFormat(version 3.2, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::NoProfile) GL version: 3.2 Supports deprecated functions false Is OpenGL ES: true supportsBufferMapping: true supportsBufferInvalidation: false forceDisableTextureBuffers: false Extensions: GL_EXT_external_buffer GL_EXT_shader_non_constant_global_initializers GL_EXT_disjoint_timer_query GL_EXT_texture_format_sRGB_override GL_OES_sample_shading GL_QCOM_texture_foveated GL_OES_texture_half_float_linear GL_EXT_texture_buffer GL_EXT_EGL_image_storage GL_OES_EGL_image GL_OES_compressed_ETC1_RGB8_texture GL_EXT_multisampled_render_to_texture GL_OES_vertex_half_float GL_EXT_EGL_image_external_wrap_modes GL_OES_standard_derivatives GL_EXT_texture_filter_anisotropic GL_EXT_texture_sRGB_decode GL_ANDROID_extension_pack_es31a GL_OES_texture_half_float GL_EXT_discard_framebuffer GL_EXT_robustness GL_EXT_shader_io_blocks GL_EXT_debug_label GL_KHR_blend_equation_advanced GL_EXT_debug_marker GL_EXT_texture_type_2_10_10_10_REV GL_EXT_texture_format_BGRA8888 GL_EXT_clip_control GL_OVR_multiview2 GL_EXT_buffer_storage GL_EXT_gpu_shader5 GL_OES_EGL_image_external_essl3 GL_EXT_YUV_target GL_EXT_EGL_image_array GL_EXT_fragment_invocation_density GL_OES_texture_npot GL_KHR_robust_buffer_access_behavior GL_KHR_texture_compression_astc_hdr GL_NV_shader_noperspective_interpolation GL_OES_EGL_image_external GL_OES_vertex_array_object GL_OES_texture_float_linear GL_QCOM_shader_framebuffer_fetch_noncoherent GL_EXT_sRGB_write_control GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_shader_image_atomic GL_EXT_primitive_bounding_box GL_KHR_debug GL_OES_shader_multisample_interpolation GL_EXT_texture_sRGB_R8 GL_OES_packed_depth_stencil GL_QCOM_motion_estimation GL_QCOM_validate_shader_binary GL_OES_sample_variables GL_QCOM_shader_framebuffer_fetch_rate GL_EXT_color_buffer_half_float GL_EXT_multisampled_render_to_texture2 GL_OVR_multiview_multisampled_render_to_texture GL_ARM_shader_framebuffer_fetch_depth_stencil GL_EXT_clip_cull_distance GL_OES_element_index_uint GL_EXT_texture_norm16 GL_EXT_sRGB GL_OES_get_program_binary GL_EXT_memory_object GL_EXT_texture_border_clamp GL_EXT_texture_cube_map_array GL_EXT_shader_framebuffer_fetch GL_KHR_texture_compression_astc_ldr GL_EXT_geometry_shader GL_QCOM_YUV_texture_gather GL_OES_depth24 GL_EXT_tessellation_shader GL_OES_texture_3D GL_OES_depth_texture GL_OES_surfaceless_context GL_EXT_read_format_bgra GL_QCOM_tiled_rendering GL_EXT_memory_object_fd GL_AMD_compressed_ATC_texture GL_OES_EGL_sync GL_QCOM_texture_foveated_subsampled_layout GL_OES_texture_compression_astc GL_EXT_draw_buffers_indexed GL_EXT_blit_framebuffer_params GL_OES_rgb8_rgba8 GL_OVR_multiview GL_EXT_protected_textures GL_KHR_blend_equation_advanced_coherent GL_KHR_no_error GL_OES_framebuffer_object GL_QCOM_alpha_test GL_EXT_blend_func_extended GL_EXT_color_buffer_float GL_OES_depth_texture_cube_map GL_OES_texture_float GL_EXT_copy_image GL_OES_texture_view QPA OpenGL Detection Info supportsDesktopGL: false supportsOpenGLES: true isQtPreferOpenGLES: true Detected renderers: (Supported) Adreno (TM) 640 (OpenGL ES 3.2 V@0502.0 (GIT@83a0eede45, If3f4a1ab82, 1637303585) (Date:11/18/21)) useBufferInvalidation (config option): false Hardware Information GPU Acceleration: angle Memory: 5501 Mb Number of Cores: 8 Swap Location: /data/data/org.krita/cache Built for: arm64+neon Base instruction set: arm64+neon Supported instruction sets: neon neon64 Current Settings Current Swap Location: /data/data/org.krita/cache Current Swap Location writable: true Undo Enabled: true Undo Stack Limit: 200 Use OpenGL: true Use OpenGL Texture Buffer: true Disable Vector Optimizations: false Disable AVX Optimizations: false Canvas State: OPENGL_SUCCESS Autosave Interval: 420 Use Backup Files: true Number of Backups Kept: 1 Backup File Suffix: ~ Backup Location: Same Folder as the File Backup Location writable: false Resource Location: /storage/emulated/0/Android/data/org.krita/files Use Win8 Pointer Input: false Use RightMiddleTabletButton Workaround: false Levels of Detail Enabled: false Use Zip64: false Display Information Number of screens: 1 Screen: 0 Name: Depth: 32 Scale: 2.25 Physical DPI122.535 Logical DPI72 Physical Size: 236, 144 Position: 0, 0 Resolution in pixels: 1138x695 Manufacturer: Model: Refresh Rate: 60 Serial Number: --------------------- 30 Dec 2024 14:36:35 +0800. Executing /data/app/~~AKvJ3yh9vaa91W53iB2c8Q==/org.krita-OiJ2OvPSbJVtOwQaQKm-Hw==/lib/arm64/libkrita_arm64-v8a.so Krita Version: 5.2.8 (git 7c43349), Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID: 23424 -- -- -- -- -- -- -- -- 30 Dec 2024 14:36:35 +0800: Style: fusion. Available styles: android, Windows, Fusion 30 Dec 2024 14:36:38 +0800: Database is up to date. Version: 0.0.17, created by Krita 5.2.2, at Wed May 15 20:39:38 2024 30 Dec 2024 14:36:45 +0800: Importing application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0 30 Dec 2024 14:36:48 +0800: Loaded image from application/x-krita. Size: 2634 * 1860 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc). Layers: 41 30 Dec 2024 14:39:26 +0800: Saving Document content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー as content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). 2634 * 1860 pixels, 41 layers. 251 frames, 24 framerate. Export configuration: No configuration 30 Dec 2024 14:39:26 +0800: Create a simple backup for content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー in /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup. 30 Dec 2024 14:39:27 +0800: Converting from application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0. Configuration: none 30 Dec 2024 14:39:29 +0800: Completed saving content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). Result: OK. Warning: . Size: 30018016 30 Dec 2024 14:39:29 +0800: Saving Completed 30 Dec 2024 14:43:44 +0800: Autosaving: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra 30 Dec 2024 14:43:45 +0800: Converting from application/x-krita to application/x-krita. Location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Real location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Batchmode: 0. Configuration: none 30 Dec 2024 14:43:48 +0800: Completed saving /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra (mime: application/x-krita). Result: OK. Warning: . Size: 29591497 30 Dec 2024 14:50:48 +0800: Autosaving: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra 30 Dec 2024 14:50:49 +0800: Converting from application/x-krita to application/x-krita. Location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Real location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Batchmode: 0. Configuration: none 30 Dec 2024 14:50:51 +0800: Completed saving /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra (mime: application/x-krita). Result: OK. Warning: . Size: 29941666 30 Dec 2024 14:51:48 +0800: Saving Document content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー as content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). 2634 * 1860 pixels, 41 layers. 251 frames, 24 framerate. Export configuration: No configuration 30 Dec 2024 14:51:48 +0800: Create a simple backup for content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー in /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup. 30 Dec 2024 14:51:49 +0800: Converting from application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0. Configuration: none 30 Dec 2024 14:51:51 +0800: Completed saving content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). Result: OK. Warning: . Size: 30550798 30 Dec 2024 14:51:51 +0800: Removing autosave file: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra 30 Dec 2024 14:51:51 +0800: Saving Completed KRITA DID NOT CLOSE CORRECTLY ================================================================================ SESSION: 30 Dec 2024 17:04:22 +0800. Executing /data/app/~~AKvJ3yh9vaa91W53iB2c8Q==/org.krita-OiJ2OvPSbJVtOwQaQKm-Hw==/lib/arm64/libkrita_arm64-v8a.so Krita Version: 5.2.8 (git 7c43349), Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID: 24244 -- -- -- -- -- -- -- -- 30 Dec 2024 17:04:22 +0800: Style: fusion. Available styles: android, Windows, Fusion 30 Dec 2024 17:04:27 +0800: Database is up to date. Version: 0.0.17, created by Krita 5.2.2, at Wed May 15 20:39:38 2024 30 Dec 2024 17:04:38 +0800: Importing application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2F言葉. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2F言葉. Batchmode: 0 30 Dec 2024 17:04:39 +0800: Loaded image from application/x-krita. Size: 1920 * 2750 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc). Layers: 13 KRITA DID NOT CLOSE CORRECTLY ================================================================================ SESSION: 31 Dec 2024 20:08:18 +0800. Executing /data/app/~~AKvJ3yh9vaa91W53iB2c8Q==/org.krita-OiJ2OvPSbJVtOwQaQKm-Hw==/lib/arm64/libkrita_arm64-v8a.so Krita Version: 5.2.8 (git 7c43349), Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID: 6090 -- -- -- -- -- -- -- -- 31 Dec 2024 20:08:18 +0800: Style: fusion. Available styles: android, Windows, Fusion 31 Dec 2024 20:08:22 +0800: Database is up to date. Version: 0.0.17, created by Krita 5.2.2, at Wed May 15 20:39:38 2024 31 Dec 2024 20:09:06 +0800: Importing application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0 31 Dec 2024 20:09:11 +0800: Loaded image from application/x-krita. Size: 2634 * 1860 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc). Layers: 41 31 Dec 2024 20:12:20 +0800: Saving Document content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー as content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). 2634 * 1860 pixels, 41 layers. 251 frames, 24 framerate. Export configuration: No configuration 31 Dec 2024 20:12:21 +0800: Create a simple backup for content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー in /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup. 31 Dec 2024 20:12:21 +0800: Converting from application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0. Configuration: none 31 Dec 2024 20:12:24 +0800: Completed saving content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). Result: OK. Warning: . Size: 30878160 31 Dec 2024 20:12:24 +0800: Saving Completed KRITA DID NOT CLOSE CORRECTLY ================================================================================ SESSION: 01 Jan 2025 02:41:57 +0800. Executing /data/app/~~AKvJ3yh9vaa91W53iB2c8Q==/org.krita-OiJ2OvPSbJVtOwQaQKm-Hw==/lib/arm64/libkrita_arm64-v8a.so Krita Version: 5.2.8 (git 7c43349), Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID: 28255 -- -- -- -- -- -- -- -- 01 Jan 2025 02:41:57 +0800: Style: fusion. Available styles: android, Windows, Fusion 01 Jan 2025 02:42:00 +0800: Database is up to date. Version: 0.0.17, created by Krita 5.2.2, at Wed May 15 20:39:38 2024 01 Jan 2025 02:42:08 +0800: Importing application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0 01 Jan 2025 02:42:12 +0800: Loaded image from application/x-krita. Size: 2634 * 1860 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc). Layers: 41 01 Jan 2025 02:46:40 +0800: Saving Document content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー as content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). 2634 * 1860 pixels, 41 layers. 251 frames, 24 framerate. Export configuration: No configuration 01 Jan 2025 02:46:40 +0800: Create a simple backup for content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー in /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup. 01 Jan 2025 02:46:41 +0800: Converting from application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0. Configuration: none 01 Jan 2025 02:46:44 +0800: Completed saving content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー (mime: application/x-krita). Result: OK. Warning: . Size: 30976338 01 Jan 2025 02:46:44 +0800: Saving Completed KRITA DID NOT CLOSE CORRECTLY ================================================================================ SESSION: 01 Jan 2025 18:29:37 +0800. Executing /data/app/~~AKvJ3yh9vaa91W53iB2c8Q==/org.krita-OiJ2OvPSbJVtOwQaQKm-Hw==/lib/arm64/libkrita_arm64-v8a.so Krita Version: 5.2.8 (git 7c43349), Qt version compiled: 5.15.7, loaded: 5.15.7. Process ID: 19072 -- -- -- -- -- -- -- -- 01 Jan 2025 18:29:37 +0800: Style: fusion. Available styles: android, Windows, Fusion 01 Jan 2025 18:29:44 +0800: Database is up to date. Version: 0.0.17, created by Krita 5.2.2, at Wed May 15 20:39:38 2024 01 Jan 2025 18:29:54 +0800: Importing application/x-krita to application/x-krita. Location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Real location: content://com.android.externalstorage.documents/document/primary%3ASaves%2Fラナー. Batchmode: 0 01 Jan 2025 18:29:58 +0800: Loaded image from application/x-krita. Size: 2634 * 1860 pixels, 4.16667 dpi. Color model: 8-bit integer/channel RGB/Alpha (sRGB-elle-V2-srgbtrc.icc). Layers: 41 01 Jan 2025 18:31:17 +0800: SAFE ASSERT (krita): "m_d->requestedFrame == frame" in file /builds/graphics/krita/libs/ui/KisAsyncAnimationRendererBase.cpp, line 140 01 Jan 2025 18:36:54 +0800: Autosaving: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra 01 Jan 2025 18:37:04 +0800: Autosaving: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra 01 Jan 2025 18:37:04 +0800: Converting from application/x-krita to application/x-krita. Location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Real location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Batchmode: 0. Configuration: none 01 Jan 2025 18:37:06 +0800: Completed saving /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra (mime: application/x-krita). Result: OK. Warning: . Size: 31057591 01 Jan 2025 18:38:57 +0800: SAFE ASSERT (krita): "m_d->requestedFrame == frame" in file /builds/graphics/krita/libs/ui/KisAsyncAnimationRendererBase.cpp, line 140 01 Jan 2025 18:43:46 +0800: Converting from application/x-krita to application/x-krita. Location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Real location: /storage/emulated/0/Android/data/org.krita/files/Documents/krita-backup/.ラナー-autosave.kra. Batchmode: 0
This crash is one of the two backtraces: They are the two most frequent crashes on Android for Krita (28% of all the crashes in total). # Backtrace 1 Exception java.lang.RuntimeException: at android.app.ActivityThread.performPauseActivityIfNeeded (ActivityThread.java:5111) at android.app.ActivityThread.performPauseActivity (ActivityThread.java:5060) at android.app.ActivityThread.handlePauseActivity (ActivityThread.java:5012) at android.app.servertransaction.PauseActivityItem.execute (PauseActivityItem.java:47) at android.app.servertransaction.ActivityTransactionItem.execute (ActivityTransactionItem.java:45) at android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:177) at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:98) at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2252) at android.os.Handler.dispatchMessage (Handler.java:106) at android.os.Looper.loopOnce (Looper.java:201) at android.os.Looper.loop (Looper.java:288) at android.app.ActivityThread.main (ActivityThread.java:7941) at java.lang.reflect.Method.invoke at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:553) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1003) Caused by android.app.BackgroundServiceStartNotAllowedException: at android.app.ContextImpl.startServiceCommon (ContextImpl.java:1862) at android.app.ContextImpl.startService (ContextImpl.java:1818) at android.content.ContextWrapper.startService (ContextWrapper.java:776) at org.krita.android.MainActivity.startForegroundServiceS (MainActivity.java:128) at org.krita.android.MainActivity.startServiceGeneric (MainActivity.java:111) at org.krita.android.MainActivity.onPause (MainActivity.java:102) at android.app.Activity.performPause (Activity.java:8244) at android.app.Instrumentation.callActivityOnPause (Instrumentation.java:1530) at android.app.ActivityThread.performPauseActivityIfNeeded (ActivityThread.java:5099) # Backtrace 2 Exception java.lang.UnsatisfiedLinkError: No implementation found for void org.krita.android.JNIWrappers.saveState() (tried Java_org_krita_android_JNIWrappers_saveState and Java_org_krita_android_JNIWrappers_saveState__) - is the library loaded, e.g. System.loadLibrary? at org.krita.android.JNIWrappers.saveState (JNIWrappers.java) at org.krita.android.DocumentSaverService$1.run (DocumentSaverService.java:120) at java.lang.Thread.run (Thread.java:1012)
The errors Dmitry mentioned are fixed, but you can still pretty easily corrupt a file with the following steps to reproduce: 1. Save a file that takes a while to save. 2. Go into the application overview and swipe Krita out of the way so that it terminates. 3. Try to reopen the file, see that it won't work. Of course #2 is likely to happen in practice in the form of Android deciding that it would really like to reclaim memory while Krita is saving and the out-of-memory killer kills it dead. I assume the reason this happens is because Krita writes directly to the output file, given that Android has no support for QSaveFile, so it just truncates the file first and starts writing it in-place. That means there's an immensely long span of time where the OS getting impatient will guarantee total data loss, both of the old file and any changes made meanwhile. That could be solved by writing the file to the internal application data first and then once that has succeeded copy it over the original file. This isn't perfect, because Android can't do an atomic move of a file like a real operating system could, but just shoveling data over is so fast that it's pretty unlikely for the application to be terminated in that exact moment. Alternatively, Krita could first back up the old file to the internal application data and then start saving, then detect whether that got interrupted on the next startup and offer to recover the file. This would never leave you in the situation where neither the old nor the new data are persisted anywhere, but downside is that it's a whole lot more work to implement, to the point where it's questionable whether it makes sense to bother with it at all over implementing the save to sandbox instead, cf. https://invent.kde.org/graphics/krita/-/issues/20 In both cases, you'd still lose your current changes of course, since Krita is terminated before it can save that, but it would at least retain the old state.
(In reply to dra.w.p.il.e+bugskde from comment #2) > The errors Dmitry mentioned are fixed, but you can still pretty easily > corrupt a file with the following steps to reproduce: > > 1. Save a file that takes a while to save. > 2. Go into the application overview and swipe Krita out of the way so that > it terminates. > 3. Try to reopen the file, see that it won't work. > > Of course #2 is likely to happen in practice in the form of Android deciding > that it would really like to reclaim memory while Krita is saving and the > out-of-memory killer kills it dead. > > I assume the reason this happens is because Krita writes directly to the > output file, given that Android has no support for QSaveFile, so it just > truncates the file first and starts writing it in-place. That means there's > an immensely long span of time where the OS getting impatient will guarantee > total data loss, both of the old file and any changes made meanwhile. > > That could be solved by writing the file to the internal application data > first and then once that has succeeded copy it over the original file. This > isn't perfect, because Android can't do an atomic move of a file like a real > operating system could, but just shoveling data over is so fast that it's > pretty unlikely for the application to be terminated in that exact moment. > > Alternatively, Krita could first back up the old file to the internal > application data and then start saving, then detect whether that got > interrupted on the next startup and offer to recover the file. This would > never leave you in the situation where neither the old nor the new data are > persisted anywhere, but downside is that it's a whole lot more work to > implement, to the point where it's questionable whether it makes sense to > bother with it at all over implementing the save to sandbox instead, cf. > https://invent.kde.org/graphics/krita/-/issues/20 > > In both cases, you'd still lose your current changes of course, since Krita > is terminated before it can save that, but it would at least retain the old > state. Thank you!(In reply to dra.w.p.il.e+bugskde from comment #2) > The errors Dmitry mentioned are fixed, but you can still pretty easily > corrupt a file with the following steps to reproduce: > > 1. Save a file that takes a while to save. > 2. Go into the application overview and swipe Krita out of the way so that > it terminates. > 3. Try to reopen the file, see that it won't work. > > Of course #2 is likely to happen in practice in the form of Android deciding > that it would really like to reclaim memory while Krita is saving and the > out-of-memory killer kills it dead. > > I assume the reason this happens is because Krita writes directly to the > output file, given that Android has no support for QSaveFile, so it just > truncates the file first and starts writing it in-place. That means there's > an immensely long span of time where the OS getting impatient will guarantee > total data loss, both of the old file and any changes made meanwhile. > > That could be solved by writing the file to the internal application data > first and then once that has succeeded copy it over the original file. This > isn't perfect, because Android can't do an atomic move of a file like a real > operating system could, but just shoveling data over is so fast that it's > pretty unlikely for the application to be terminated in that exact moment. > > Alternatively, Krita could first back up the old file to the internal > application data and then start saving, then detect whether that got > interrupted on the next startup and offer to recover the file. This would > never leave you in the situation where neither the old nor the new data are > persisted anywhere, but downside is that it's a whole lot more work to > implement, to the point where it's questionable whether it makes sense to > bother with it at all over implementing the save to sandbox instead, cf. > https://invent.kde.org/graphics/krita/-/issues/20 > > In both cases, you'd still lose your current changes of course, since Krita > is terminated before it can save that, but it would at least retain the old > state. Thank you!
I think I made the comment a little long sorry
A possibly relevant merge request was started @ https://invent.kde.org/graphics/krita/-/merge_requests/2556
Git commit 02e9966601ca99f07b9db31cf3edabdd8d40ee70 by Dmitry Kazakov, on behalf of Carsten Hartenfels. Committed on 08/12/2025 at 10:36. Pushed by dkazakov into branch 'master'. [android] Write to temporary file when saving Instead of using QSaveFile, because that doesn't work on Android due to sandboxing. Nor does the usual method of QFile::copy work on Android, we have to do that manually by opening the target file and shoveling bytes. M +90 -12 libs/ui/KisImportExportManager.cpp https://invent.kde.org/graphics/krita/-/commit/02e9966601ca99f07b9db31cf3edabdd8d40ee70
Git commit 49af64b324526aa94b1a9d4b604dac9f79671b41 by Dmitry Kazakov. Committed on 08/12/2025 at 10:36. Pushed by dkazakov into branch 'krita/5.2'. [android] Write to temporary file when saving Instead of using QSaveFile, because that doesn't work on Android due to sandboxing. Nor does the usual method of QFile::copy work on Android, we have to do that manually by opening the target file and shoveling bytes. (cherry picked from commit 02e9966601ca99f07b9db31cf3edabdd8d40ee70) Co-authored-by: Carsten Hartenfels <carsten.hartenfels@pm.me> M +90 -12 libs/ui/KisImportExportManager.cpp https://invent.kde.org/graphics/krita/-/commit/49af64b324526aa94b1a9d4b604dac9f79671b41