SUMMARY I'm using Howdy (https://github.com/boltgolt/howdy) pam module for authentication in kscreenlocker but after 5.25 update my screenlock become broken. Howdy still works with sudo as it used to. Before update to 5.25 kscreenlocker worked as well. If I disable howdy pam module, password unlock works as intended. STEPS TO REPRODUCE 1. Enable howdy module in /etc/pam.d/kde 2. Lock screen 3. Press any button to start process of unlocking 4. It crashes immediately OBSERVED RESULT Crash, error message, not beeing able to unlock screen EXPECTED RESULT Face unlock SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.25.0 KDE Frameworks Version: 5.95.0 Qt Version: 5.15.5 ADDITIONAL INFORMATION coredump: coredumpctl gdb 6898 PID: 6898 (kscreenlocker_g) UID: 1000 (vlad) GID: 1000 (vlad) Signal: 11 (SEGV) Timestamp: Sun 2022-06-19 14:41:55 MSK (8min ago) Command Line: /usr/lib/kscreenlocker_greet --testing Executable: /usr/lib/kscreenlocker_greet Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-kitty-0e186be1ae64434ea6e56d3218023cb7.scope Unit: user@1000.service User Unit: app-kitty-0e186be1ae64434ea6e56d3218023cb7.scope Slice: user-1000.slice Owner UID: 1000 (vlad) Boot ID: 47c787d8e11142c4a5ffe1e18e090fa4 Machine ID: c31b7b650acf4fb8929530e4a0a59fe0 Hostname: ideapad Storage: /var/lib/systemd/coredump/core.kscreenlocker_g.1000.47c787d8e11142c4a5ffe1e18e090fa4.6898.1655638915000000.zst (present) Disk Size: 25.6M Message: Process 6898 (kscreenlocker_g) of user 1000 dumped core. 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libpcre2-16.so.0 with build-id 68a5c2d52b45bfa6b1e93d2766e80094f52d9ebf Module libicuuc.so.71 with build-id 633fdc0c5385d916571f6140e7a978ad0630ef55 Module libicui18n.so.71 with build-id 6fd5c97fd2808ee29958bf809656d5885e7e8963 Module libdouble-conversion.so.3 with build-id d162eb67b00f523a3f146b1077ae00fe04d5fb85 Module libsystemd.so.0 with build-id a220b34e873e29bb116d88be0bf11fac7089ef4d Module libmd4c.so.0 with build-id 2151dba72cdc9960097e6e960a58a2f03c8bb96e Module libharfbuzz.so.0 with build-id c58fe082cbde02fc176e3c3663a6d81386eb5027 Module libpng16.so.16 with build-id 2dc0bce07f199bf983c07a05fb95a6f4af83a9b3 Module libGL.so.1 with build-id b915a2e48be6c9fd3cc6f9f4c7aab1f7aeed8a4c Module libcrypto.so.1.1 with build-id d54a7ee1e288aeae436d073277ff986e03994b15 Module libssl.so.1.1 with build-id 25a55106cb13dec5d495c34ca1caf2c2f3114f11 Module libgssapi_krb5.so.2 with build-id 292f1ce32161c0ecc4a287bc8494d5d7c420a03f Module libz.so.1 with build-id fefe3219a96d682ec98fcfb78866b8594298b5a2 Module libQt5QmlModels.so.5 with build-id 11db7d0f6adbc46e72a1270478848e19bcefdbe7 Module libgcc_s.so.1 with build-id 0e3de903950e35ae59a5de8c00b1817a4a71ca01 Module libdbus-1.so.3 with build-id 7f4b16b4b407cbae2d7118d6f99610e29a18a56a Module libm.so.6 with build-id 1b7296ef9fd806e47060788389293c824b09ad72 Module libKF5Archive.so.5 with build-id 7bde8517609011720ec79b8bba0439f3c29947f5 Module libKF5KIOWidgets.so.5 with build-id 790758d35a19f3faed3e454cd10744c611306ed4 Module libdl.so.2 with build-id 94198b268228074fa9f405bbedbbae94112593ed Module libaudit.so.1 with build-id 53c797475ffeed05918d78f49f85dbf4127fb174 Module libKF5ItemViews.so.5 with build-id 45e74365be91f0efbd76584bcfd3e0939f152706 Module libKF5WidgetsAddons.so.5 with build-id a282071c99d8a48e7a896561baaa0f7b32dcec7f Module libQt5Xml.so.5 with build-id f02a96cd6c28fb8c1d9b1e56cc727baeff837df3 Module libKF5GuiAddons.so.5 with build-id 98ffd3832681cd0c549e4a16a47042a51d4a5c08 Module libKF5ConfigWidgets.so.5 with build-id a86eff569a238a57beb3a8b5b793fefa0d90acc2 Module libKF5IconThemes.so.5 with build-id d38342c6496b557164c0261464e4001d32fe9cc4 Module libQt5PrintSupport.so.5 with build-id bbc1babb372d1f09da1a9e3333b7404e8e1fe7ca Module libKF5GlobalAccel.so.5 with build-id 9317c6e6189582ef1fde332613c7cd0ca5145ada Module libQt5WaylandClient.so.5 with build-id 24ed5b5957a757593c290a7ee5b484f8ffa22b80 Module libffi.so.8 with build-id f0a9586cf0f42d2b9971bd1065ca3a6b19f4a2c2 Module libQt5Widgets.so.5 with build-id 2db4fb5e42157ccb2b6c52acc6ede3acfecedd6a Module libxcb-keysyms.so.1 with build-id 507bdc94868b9b1f9d95e31c492694f2513da88d Module libxcb.so.1 with build-id 13d677412a71468381b11092915d231f664d18d3 Module libc.so.6 with build-id 60df1df31f02a7b23da83e8ef923359885b81492 Module libstdc++.so.6 with build-id b3eaebcb5369487562e52dd8d016c9cd77f80c54 Module libQt5Core.so.5 with build-id c2e0575e4ac48235c8ac01169f8330fae6032802 Module libQt5Gui.so.5 with build-id cd2aac45ffd1db549dfbfdc1b72949806d99e8fc Module libQt5Network.so.5 with build-id 3c0d72b14156381983ce0b5c6ecb082e5a28c576 Module libQt5Qml.so.5 with build-id f36f75407363858446bd91ee785afbda52ba5abe Module libQt5Quick.so.5 with build-id 35261a038f923611ff79ab68fee76dede20997d8 Module libKF5CoreAddons.so.5 with build-id a55761be868c97b8379b15739d78cc2013e152bd Module libQt5DBus.so.5 with build-id ff4a550092d4e5c10e674968f42d1804b328ea92 Module libKF5ConfigCore.so.5 with build-id f549c7bd7043908b2979a4172dbef55dd71b5890 Module libKF5I18n.so.5 with build-id 5ab2d11e1ab28a5fd4b851fca2b062d1e9a6f8f0 Module libKF5Package.so.5 with build-id fc4e86ac6990034db174cec8bc0861d07c7667dc Module libKF5Declarative.so.5 with build-id 7502ae35a5161b1cc17d2aba36c3ca684f31c986 Module libKF5ConfigGui.so.5 with build-id 12fea5d387246e0efb9b85ccc0c10ff6788d93ab Module libQt5X11Extras.so.5 with build-id ec950f22918930044e4b7cebb233977269559525 Module libpam.so.0 with build-id bb11b2685fe89555938ffd330ea44d82b0f8701c Module libKF5XmlGui.so.5 with build-id 51785684a7043aaa1cf9de7c25a07dec74d5a080 Module libKF5ConfigQml.so.5 with build-id 59e4796dc9993fbeca65ebaf1db6f416772fb8f9 Module libLayerShellQtInterface.so.5 with build-id 320db1a7f2f5d892ff640e8d8959084589fbc20d Module libwayland-client.so.0 with build-id 95e7368b400dd57e3db2a5c385de71c7dca08879 Module libKF5WaylandClient.so.5 with build-id e0a1b6d743d6690a309a4e9de9f0992bd3fb41c4 Module libX11.so.6 with build-id 310f8f1b8d7457d326407e0eb794353c62769b73 Module libKF5WindowSystem.so.5 with build-id f48aa6422db900fc29287374f01a697aed8d1c78 Module libKF5QuickAddons.so.5 with build-id b574874c540950f5a6a70735b602836254c0c54e Module libKF5Crash.so.5 with build-id 8eb7e3ee94fd628b068f4a3174f419530ed6cf70 Module kscreenlocker_greet with build-id 8acd8314f77a122c96c65a7707fb3fd8ad21168f Stack trace of thread 6902: #0 0x00007fb0d5ae7180 n/a (pam_python.so + 0x7180) #1 0x00007fb0d44ed9bf PyEval_EvalFrameEx (libpython2.7.so.1.0 + 0xa29bf) #2 0x00007fb0d44eddbd PyEval_EvalFrameEx (libpython2.7.so.1.0 + 0xa2dbd) #3 0x00007fb0d44ec3e5 PyEval_EvalCodeEx (libpython2.7.so.1.0 + 0xa13e5) #4 0x00007fb0d44fe9dc function_call (libpython2.7.so.1.0 + 0xb39dc) #5 0x00007fb0d44e1ce3 PyObject_Call (libpython2.7.so.1.0 + 0x96ce3) #6 0x00007fb0d44f6fa8 PyEval_CallObjectWithKeywords (libpython2.7.so.1.0 + 0xabfa8) #7 0x00007fb0d5ae6bc9 n/a (pam_python.so + 0x6bc9) #8 0x00007fb0d5ae74df n/a (pam_python.so + 0x74df) #9 0x00007fb0dd0ca91a n/a (libpam.so.0 + 0x391a) #10 0x00007fb0dd0ca181 pam_authenticate (libpam.so.0 + 0x3181) #11 0x0000559728f91390 n/a (kscreenlocker_greet + 0x10390) #12 0x00007fb0dbb03830 _ZN7QObject5eventEP6QEvent (libQt5Core.so.5 + 0x2b0830) #13 0x00007fb0dbadff38 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 + 0x28cf38) #14 0x00007fb0dbae0a33 _ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData (libQt5Core.so.5 + 0x28da33) #15 0x00007fb0dbb26818 n/a (libQt5Core.so.5 + 0x2d3818) #16 0x00007fb0d971cc6b g_main_context_dispatch (libglib-2.0.so.0 + 0x54c6b) #17 0x00007fb0d9773001 n/a (libglib-2.0.so.0 + 0xab001) #18 0x00007fb0d971a392 g_main_context_iteration (libglib-2.0.so.0 + 0x52392) #19 0x00007fb0dbb2a64c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d764c) #20 0x00007fb0dbad86ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2856ec) #21 0x00007fb0db93a29f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe729f) #22 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #23 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #24 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6907: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6901: #0 0x00007fb0db513c3f __poll (libc.so.6 + 0x105c3f) #1 0x00007fb0dac3cd7d n/a (libQt5WaylandClient.so.5 + 0x71d7d) #2 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #3 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #4 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6908: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6910: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6917: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6922: #0 0x00007fb0db513c3f __poll (libc.so.6 + 0x105c3f) #1 0x00007fb0d9772f68 n/a (libglib-2.0.so.0 + 0xaaf68) #2 0x00007fb0d971a392 g_main_context_iteration (libglib-2.0.so.0 + 0x52392) #3 0x00007fb0dbb2a64c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d764c) #4 0x00007fb0dbad86ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2856ec) #5 0x00007fb0db93a29f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe729f) #6 0x00007fb0dcaa3c9f n/a (libQt5Quick.so.5 + 0x154c9f) #7 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #8 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #9 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6913: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6935: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6909: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6928: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6906: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6898: #0 0x00007fb0dc79efcd n/a (libQt5Qml.so.5 + 0x253fcd) #1 0x00007fb0dc7c18cf _ZN12QQmlNotifier10emitNotifyEP20QQmlNotifierEndpointPPv (libQt5Qml.so.5 + 0x2768cf) #2 0x00007fb0dbb1014d n/a (libQt5Core.so.5 + 0x2bd14d) #3 0x0000559728f8d5ba n/a (kscreenlocker_greet + 0xc5ba) #4 0x00007fb0dbb03830 _ZN7QObject5eventEP6QEvent (libQt5Core.so.5 + 0x2b0830) #5 0x00007fb0dbadff38 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 + 0x28cf38) #6 0x00007fb0dbae0a33 _ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData (libQt5Core.so.5 + 0x28da33) #7 0x00007fb0dbb26818 n/a (libQt5Core.so.5 + 0x2d3818) #8 0x00007fb0d971cc6b g_main_context_dispatch (libglib-2.0.so.0 + 0x54c6b) #9 0x00007fb0d9773001 n/a (libglib-2.0.so.0 + 0xab001) #10 0x00007fb0d971a392 g_main_context_iteration (libglib-2.0.so.0 + 0x52392) #11 0x00007fb0dbb2a64c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d764c) #12 0x00007fb0dbad86ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2856ec) #13 0x00007fb0dbae31e9 _ZN16QCoreApplication4execEv (libQt5Core.so.5 + 0x2901e9) #14 0x0000559728f8c5a9 n/a (kscreenlocker_greet + 0xb5a9) #15 0x00007fb0db437290 n/a (libc.so.6 + 0x29290) #16 0x00007fb0db43734a __libc_start_main (libc.so.6 + 0x2934a) #17 0x0000559728f8d1b5 n/a (kscreenlocker_greet + 0xc1b5) Stack trace of thread 6932: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6930: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6900: #0 0x00007fb0db513c3f __poll (libc.so.6 + 0x105c3f) #1 0x00007fb0dac3cd7d n/a (libQt5WaylandClient.so.5 + 0x71d7d) #2 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #3 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #4 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6903: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6924: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6919: #0 0x00007fb0db5165f1 pselect (libc.so.6 + 0x1085f1) #1 0x00007fb0d6c01524 n/a (libusbmuxd-2.0.so.6 + 0x2524) #2 0x00007fb0d6c028a9 n/a (libusbmuxd-2.0.so.6 + 0x38a9) #3 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #4 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6911: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6912: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6899: #0 0x00007fb0db513c3f __poll (libc.so.6 + 0x105c3f) #1 0x00007fb0d9772f68 n/a (libglib-2.0.so.0 + 0xaaf68) #2 0x00007fb0d971a392 g_main_context_iteration (libglib-2.0.so.0 + 0x52392) #3 0x00007fb0dbb2a64c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d764c) #4 0x00007fb0dbad86ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2856ec) #5 0x00007fb0db93a29f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe729f) #6 0x00007fb0dcf5675a n/a (libQt5DBus.so.5 + 0x2375a) #7 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #8 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #9 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6904: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6915: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6916: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6918: #0 0x00007fb0db513c3f __poll (libc.so.6 + 0x105c3f) #1 0x00007fb0d9772f68 n/a (libglib-2.0.so.0 + 0xaaf68) #2 0x00007fb0d971a392 g_main_context_iteration (libglib-2.0.so.0 + 0x52392) #3 0x00007fb0dbb2a64c _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2d764c) #4 0x00007fb0dbad86ec _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2856ec) #5 0x00007fb0db93a29f _ZN7QThread4execEv (libQt5Core.so.5 + 0xe729f) #6 0x00007fb0dc80a780 n/a (libQt5Qml.so.5 + 0x2bf780) #7 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #8 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #9 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6905: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6923: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6936: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6931: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6933: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6927: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6929: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6934: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6925: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6914: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499920 pthread_cond_wait (libc.so.6 + 0x8b920) #2 0x00007fb0c5ebc8cc n/a (radeonsi_dri.so + 0xb28cc) #3 0x00007fb0c5eb605c n/a (radeonsi_dri.so + 0xac05c) #4 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #5 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) Stack trace of thread 6926: #0 0x00007fb0db497119 n/a (libc.so.6 + 0x89119) #1 0x00007fb0db499c24 pthread_cond_timedwait (libc.so.6 + 0x8bc24) #2 0x00007fb0db93e764 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xeb764) #3 0x00007fb0db93b337 n/a (libQt5Core.so.5 + 0xe8337) #4 0x00007fb0db93738a n/a (libQt5Core.so.5 + 0xe438a) #5 0x00007fb0db49a54d n/a (libc.so.6 + 0x8c54d) #6 0x00007fb0db51f874 __clone (libc.so.6 + 0x111874) ELF object binary architecture: AMD x86-64 GNU gdb (GDB) 12.1 Copyright (C) 2022 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-pc-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/lib/kscreenlocker_greet... (No debugging symbols found in /usr/lib/kscreenlocker_greet) warning: Can't open file /memfd:JITCode:QtQml (deleted) during file-backed mapping note processing warning: Can't open file /memfd:wayland-shm (deleted) during file-backed mapping note processing warning: Can't open file /memfd:wayland-cursor (deleted) during file-backed mapping note processing warning: Can't open file /tmp/kwin.qXQuZz (deleted) during file-backed mapping note processing warning: Can't open file /memfd:unknown-usage:QtQml (deleted) during file-backed mapping note processing warning: Can't open file /memfd:JSGCHeap:QtQml (deleted) during file-backed mapping note processing warning: Can't open file /memfd:JSVMStack:QtQml (deleted) during file-backed mapping note processing [New LWP 6902] [New LWP 6907] [New LWP 6901] [New LWP 6908] [New LWP 6910] [New LWP 6917] [New LWP 6922] [New LWP 6913] [New LWP 6935] [New LWP 6909] [New LWP 6928] [New LWP 6906] [New LWP 6898] [New LWP 6932] [New LWP 6930] [New LWP 6900] [New LWP 6903] [New LWP 6924] [New LWP 6919] [New LWP 6911] [New LWP 6912] [New LWP 6899] [New LWP 6904] [New LWP 6915] [New LWP 6916] [New LWP 6918] [New LWP 6905] [New LWP 6923] [New LWP 6936] [New LWP 6931] [New LWP 6933] [New LWP 6927] [New LWP 6929] [New LWP 6934] [New LWP 6925] [New LWP 6914] [New LWP 6926] warning: Section `.reg-xstate/6902' in core file too small. [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". --Type <RET> for more, q to quit, c to continue without paging-- Core was generated by `/usr/lib/kscreenlocker_greet --testing'. Program terminated with signal SIGSEGV, Segmentation fault. warning: Section `.reg-xstate/6902' in core file too small. #0 0x00007fb0d5ae7180 in ?? () from /usr/lib/security/pam_python.so [Current thread is 1 (Thread 0x7fb0c7fff640 (LWP 6902))] (gdb) bt #0 0x00007fb0d5ae7180 in ?? () from /usr/lib/security/pam_python.so #1 0x00007fb0d44ed9bf in call_function (oparg=<optimized out>, pp_stack=0x7fb0c7ffe110) at Python/ceval.c:4376 #2 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3013 #3 0x00007fb0d44eddbd in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7fb0c7ffe220, func=<optimized out>) at Python/ceval.c:4461 #4 call_function (oparg=<optimized out>, pp_stack=0x7fb0c7ffe220) at Python/ceval.c:4396 #5 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3013 #6 0x00007fb0d44ec3e5 in PyEval_EvalCodeEx (co=0x7fb06e4dacb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, kws=<optimized out>, kwcount=<optimized out>, defs=<optimized out>, defcount=<optimized out>, closure=<optimized out>) at Python/ceval.c:3608 #7 0x00007fb0d44fe9dc in function_call (func=func@entry=0x7fb06e4191d0, arg=0x7fb06e4179b0, kw=0x0) at Objects/funcobject.c:523 #8 0x00007fb0d44e1ce3 in PyObject_Call (func=0x7fb06e4191d0, arg=<optimized out>, kw=<optimized out>) at Objects/abstract.c:2544 #9 0x00007fb0d44f6fa8 in PyEval_CallObjectWithKeywords (func=0x7fb06e4191d0, arg=0x7fb06e4179b0, kw=<optimized out>) at Python/ceval.c:4245 #10 0x00007fb0d5ae6bc9 in ?? () from /usr/lib/security/pam_python.so #11 0x00007fb0d5ae74df in ?? () from /usr/lib/security/pam_python.so #12 0x00007fb0dd0ca91a in ?? () from /usr/lib/libpam.so.0 #13 0x00007fb0dd0ca181 in pam_authenticate () from /usr/lib/libpam.so.0 #14 0x0000559728f91390 in ?? () #15 0x00007fb0dbb03830 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5 #16 0x00007fb0dbadff38 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5 #17 0x00007fb0dbae0a33 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5 #18 0x00007fb0dbb26818 in ?? () from /usr/lib/libQt5Core.so.5 #19 0x00007fb0d971cc6b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #20 0x00007fb0d9773001 in ?? () from /usr/lib/libglib-2.0.so.0 #21 0x00007fb0d971a392 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #22 0x00007fb0dbb2a64c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5 #23 0x00007fb0dbad86ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5 #24 0x00007fb0db93a29f in QThread::exec() () from /usr/lib/libQt5Core.so.5 #25 0x00007fb0db93738a in ?? () from /usr/lib/libQt5Core.so.5 #26 0x00007fb0db49a54d in ?? () from /usr/lib/libc.so.6 #27 0x00007fb0db51f874 in clone () from /usr/lib/libc.so.6
And here is the issue in Howdy bug tracker: https://github.com/boltgolt/howdy/issues/679
Note that this is not specifically Howdy, it's a regression that has broken pam-python: segfault at 8 ip 00007fb39a81ba50 sp 00007fb39b022140 error 4 in pam_python.so[7fb39a818000+5000]
I tried to update pam_python to python3 version from this(https://github.com/castlabs/pam-python) repository, crash still happens same way. But I noticed what exactly leads to crash: it's probably messages howdy sends to lockerscreen. When I disable detection_notice and confirmation messages in howdy config making it completely silent, lockerscreen sort of works in testing mode, but unfortunately still crashes after unlocking screen for real. Also with 'detection_notice = true' crash happens after howdy face recognition.
Created attachment 150003 [details] coredump
Possibly it relates to https://invent.kde.org/plasma/kscreenlocker/-/merge_requests/59/
This crash is deep in howdy code. That's a howdy bug until shown otherwise.
>it's a regression that has broken pam-python: Including a dummy test case with pam-python? If so I'll revisit our side.
Here's a test case that still results in a segfault and does not interact with Howdy in any way: ``` import subprocess import os import glob import syslog def doAuth(pamh): pamh.conversation(pamh.Message(pamh.PAM_TEXT_INFO, "Attempting face detection")) return pamh.PAM_SYSTEM_ERR def pam_sm_authenticate(pamh, flags, args): return doAuth(pamh) def pam_sm_open_session(pamh, flags, args): return doAuth(pamh) def pam_sm_close_session(pamh, flags, argv): return pamh.PAM_SUCCESS def pam_sm_setcred(pamh, flags, argv): return pamh.PAM_SUCCESS ``` Seems to be the call to pamh.conversation that causes it?
thanks
int PamWorker::converse(int n, const struct pam_message **msg, struct pam_response **resp, void *data) If there's no prompt we left "resp" alone. pam_python sends garbage in then deletes it. I can fix it my side. Thanks for making the minimal example.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kscreenlocker/-/merge_requests/83
Git commit 1ff38e1ddbe575d4e99c0c5e9e1c01d69142f088 by David Edmundson. Committed on 21/06/2022 at 15:10. Pushed by davidedmundson into branch 'master'. Initialise pam response in all converse conditions This turned out to be an issue for pam_python when sending an info/error message that shouldn't have a response some code still tried to free the result of any prompt. Somewhat questionable, but we should still be returning a valid struct full of nulls. M +6 -6 greeter/pamauthenticator.cpp https://invent.kde.org/plasma/kscreenlocker/commit/1ff38e1ddbe575d4e99c0c5e9e1c01d69142f088
Thanks for the quick fix!
Git commit 13dfae3fbc7e4d7e8b6692aed65baa272252ec36 by Nate Graham, on behalf of David Edmundson. Committed on 21/06/2022 at 16:33. Pushed by ngraham into branch 'Plasma/5.25'. Initialise pam response in all converse conditions This turned out to be an issue for pam_python when sending an info/error message that shouldn't have a response some code still tried to free the result of any prompt. Somewhat questionable, but we should still be returning a valid struct full of nulls. (cherry picked from commit 1ff38e1ddbe575d4e99c0c5e9e1c01d69142f088) M +6 -6 greeter/pamauthenticator.cpp https://invent.kde.org/plasma/kscreenlocker/commit/13dfae3fbc7e4d7e8b6692aed65baa272252ec36