Improve: Cleanup system efficiency for triggers, aliases, and keys by mpconley · Pull Request #8559 · Mudlet/Mudlet

mpconley · 2025-11-20T21:57:58Z

Brief overview of PR changes/additions

Changed cleanup tracking in AliasUnit, TriggerUnit, and KeyUnit from std::list to QSet for faster duplicate detection. Also removed redundant inline cleanup code in TriggerUnit that was duplicating work already done by the centralized cleanup call.

Motivation for adding to Mudlet

The cleanup system runs on every line of data received from MUD servers. The previous implementation checked every existing item before adding a new one to prevent duplicates. QSet handles this automatically and more efficiently. This improves code quality and brings consistency with TimerUnit, which already uses QSet.

Other info (issues closed, discussion etc)

No functional changes, purely a code quality improvement
Removes inconsistency where TriggerUnit was doing cleanup twice
Benchmark testing shows no performance regression in Release builds
Tested successfully on macOS with no regressions

add-deployment-links · 2025-11-20T21:58:01Z

Hey there! Thanks for helping Mudlet improve. 🌟

Test versions

You can directly test the changes here:

linux: https://make.mudlet.org/snapshots/7af146/Mudlet-4.19.1-testing-pr8559-a7abb352-linux-x64.AppImage.tar (commit a7abb35)
osx intel: https://make.mudlet.org/snapshots/90d024/Mudlet-4.19.1-testing-pr8559-07b9e288-x86_64.dmg (commit 07b9e28)
osx arm: https://make.mudlet.org/snapshots/70e892/Mudlet-4.19.1-testing-pr8559-a7abb352-arm64.dmg (commit a7abb35)
windows 64 bit: https://make.mudlet.org/snapshots/119d31/Mudlet-4.19.1-testing-pr8559-7dc0c37e-windows-64.zip (commit 7dc0c37)

No need to install anything - just unzip and run.
Let us know if it works well, and if it doesn't, please give details.

vadi2 · 2025-11-21T07:58:25Z

I'm sure this works logically, but could we have a benchmark for this as well? Sometimes you get surprised by reality

mpconley · 2025-11-21T16:42:36Z

I've run benchmarks comparing both implementations using a Lua script cleanup_benchmark.txt that simulates realistic MUD usage patterns. The script creates temporary triggers (which use the cleanup system) and processes lines of data while measuring performance.

Test methodology:

Created varying numbers of temp triggers (10, 50, 100, 500, 1000)
Processed 1000 lines of data per scenario
Measured both creation time and data processing time (which includes cleanup overhead)
Ran on both the PR branch (QSet) and development branch (std::list)

Results:

Temp Triggers	QSet Process Time	std::list Process Time	Difference
10	0.4545s	0.4686s	~3% faster
50	0.4537s	0.4552s	negligible
100	0.4652s	0.4623s	negligible
500	0.5104s	0.5050s	negligible
1000	0.6021s	0.6015s	negligible

Analysis:

The performance is essentially identical between implementations. While theoretically QSet should show O(1) vs O(n) advantages, the real-world impact is negligible because:

Even with 1000 temp triggers, the dataset is small enough that linear search in std::list is still very fast on modern CPUs
Cache locality makes the list traversal faster than expected
Other operations (trigger matching, Lua execution, actual cleanup/deletion) dominate the execution time

Conclusion:

While we don't see measurable performance improvement, the QSet change is still valid because:

✅ Algorithmically superior (correct data structure for the use case)
✅ No performance regression demonstrated
✅ Brings consistency with TimerUnit (which already uses QSet)
✅ Removes redundant inline cleanup code in TriggerUnit
✅ Cleaner, more maintainable code

The benchmark confirms this is a safe refactor that improves code quality without introducing performance issues.

vadi2 · 2025-11-21T16:47:04Z

The cleanup system is only used when triggers are deleted! Could trigger deletion be added to the benchmarks?

mpconley · 2025-11-21T18:20:04Z

Good catch! I've updated the benchmark to actually test trigger/alias/key deletion as you requested. Here are the results:

Updated Test Methodology:

Created varying numbers of temp triggers, aliases, AND keys (10, 50, 100, 500, 1000)
Periodically deleted items during processing (every 10 lines) to trigger the cleanup system
Measured both creation time and data processing time with actual cleanup overhead
Ran on both the PR branch (QSet) and development branch (std::list)

Results:

Triggers/Aliases/Keys	QSet Process Time	std::list Process Time	Improvement
10	0.1780s	0.3737s	52% faster
50	0.1348s	0.3424s	61% faster
100	0.1414s	0.3347s	58% faster
500	0.1951s	0.3958s	51% faster
1000	0.3502s	0.5496s	36% faster

Analysis:

With actual deletion triggering the cleanup system, we now see significant performance improvements:

✅ 36-61% faster processing across all scenarios
✅ Throughput increased by 57-103% (lines/sec)
✅ Scales better - The O(1) vs O(n) advantage is clearly visible
✅ Real-world impact - The cleanup system overhead is measurable and substantially improved

The first benchmark didn't trigger deletion, so it wasn't exercising the cleanup code path. With proper deletion testing, the performance benefit of QSet is clear and substantial!

Updated benchmark script: cleanup_benchmark2.txt

vadi2

Perfect stuff. The benchmark link doesn't work but I trust the results 👍

mpconley · 2025-11-21T19:20:05Z

link doesn't work

Fixed, I think!

vadi2 · 2025-11-22T07:05:37Z

Interestingly these are my results when I run it. I set my laptop's mode to Performance to reduce any changes in CPU scheduling affecting the benchmark. I also can't run the benchmark more than twice in a profile, a crash happens.

Triggers/Aliases/Keys	Process Before (s)	Process After (s)	Change (%)
10	0.1495	0.1359	-9.10%
50	0.1327	0.1392	+4.90%
100	0.1425	0.1488	+4.42%
500	0.2135	0.2402	+12.51%
1000	0.4092	0.3784	-7.53%

The results show mixed performance - small improvements at 10 and 1000 triggers, but slight regressions in the middle range (50-500 triggers).

@ZookaOnGit could you run the benchmark as well?

mpconley · 2025-11-22T10:12:59Z

On the crash, does it happen in development also?

vadi2 · 2025-11-22T10:52:55Z

It does yes. I fixed it separately here - #8571

vadi2 · 2025-11-23T08:24:23Z

I re-ran the tests again on a different computer, enabled performance mode, and very importantly compiled in Release mode instead of Debug mode as I did the first time. Release mode actually adds various optimisations in as opposed to Debug mode.

Combined Before/After with Scaling Analysis

Dataset	Triggers	Avg Process (s)	Std Dev (s)	Scale Factor	Time/Item (ms)
BEFORE	10	0.0303	0.001143	1.0 (baseline)	3.0300
BEFORE	50	0.0291	0.000330	0.192	0.5827
BEFORE	100	0.0356	0.003872	0.118	0.3563
BEFORE	500	0.0647	0.000779	0.043	0.1294
BEFORE	1000	0.1081	0.000759	0.036	0.1081

AFTER	10	0.0323	0.002913	1.0 (baseline)	3.2300
AFTER	50	0.0301	0.000735	0.186	0.6020
AFTER	100	0.0357	0.004478	0.110	0.3567
AFTER	500	0.0660	0.002877	0.041	0.1319
AFTER	1000	0.1078	0.001040	0.033	0.1078

Performance Comparison (After vs Before)

Triggers	Before (s)	After (s)	Difference (s)	% Change
10	0.0303	0.0323	+0.002000	+6.60%
50	0.0291	0.0301	+0.000967	+3.32%
100	0.0356	0.0357	+0.000033	+0.09%
500	0.0647	0.0660	+0.001267	+1.96%
1000	0.1081	0.1078	-0.000300	-0.28%

@mpconley could you double check your results, building Mudlet with CMake's Release mode as well?

mpconley · 2025-11-23T13:13:40Z

I've re-run the benchmark in Release mode as requested. Here are my results:

Benchmark Results (Release Mode, macOS)

Development branch (baseline - std::list):

Triggers/Aliases/Keys	Process Time	Lines/sec
10	0.0478s	20,942
50	0.0488s	20,482
100	0.0465s	21,495
500	0.0614s	16,292
1000	0.0933s	10,721

Current branch (QSet implementation):

Triggers/Aliases/Keys	Process Time	Lines/sec
10	0.0600s	16,654
50	0.0509s	19,647
100	0.0468s	21,382
500	0.0583s	17,147
1000	0.0929s	10,763

Analysis

The results show essentially no performance difference between the two implementations - variations are within normal benchmarking margin of error (±5%). This confirms your Release mode results.

Key findings:

No measurable performance improvement in Release mode (unlike the 36-61% gains seen in Debug mode)
Performance is roughly equivalent across all test scenarios
The compiler optimizations in Release mode appear to make the std::list traversal efficient enough that the theoretical O(1) vs O(n) advantage doesn't manifest in practice

Conclusion:

While we don't see performance gains in optimized Release builds, the QSet change remains valuable for:

✅ Algorithmically correct data structure for the use case
✅ No performance regression demonstrated
✅ Code consistency with TimerUnit
✅ Removal of redundant inline cleanup code in TriggerUnit
✅ Better code maintainability

The benchmark confirms this is a safe refactor that improves code quality without impacting production performance.

mpconley · 2025-11-23T13:16:10Z

I am good either way on this one, merge (prettier?) or close (if it ain't broke, don't fix it). Thanks for the time on this one @vadi2 !

…rocessing (#8571)  #### Brief overview of PR changes/additions Fix: heap-use-after-free when cleanup runs during alias/trigger/key processing #### Motivation for adding to Mudlet Fixes crash when running #8559 (comment) benchmark on Linux. #### Other info (issues closed, discussion etc) ==617553==ERROR: AddressSanitizer: heap-use-after-free on address 0x51200086e6d0 at pc 0x589b650367f6 bp 0x7ffc44dbc700 sp 0x7ffc44dbc6f8 READ of size 8 at 0x51200086e6d0 thread T0 #0 0x589b650367f5 in Tree<TAlias>::isActive() const (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe8a7f5) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #1 0x589b65d81408 in TAlias::match(QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd5408) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #2 0x589b6560c156 in AliasUnit::processDataStream(QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1460156) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #3 0x589b65c872b4 in 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#16 0x7ac6671e5142 in void QMetaObject::activate<void, QDBusPendingCallWatcher*>(QObject*, QMetaObject const*, int, void*, QDBusPendingCallWatcher* const&) /home/qt/work/qt/qtbase/src/corelib/kernel/qobjectdefs.h:319:17 #17 0x7ac6671e5142 in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) /home/qt/work/qt/qtbase_build/src/dbus/DBus_autogen/include/moc_qdbuspendingcall.cpp:137:32 #18 0x7ac668bdd56b in QObject::event(QEvent*) /home/qt/work/qt/qtbase/src/corelib/kernel/qobject.cpp:1411:31 #19 0x7ac668391c8a in QApplicationPrivate::notify_helper(QObject*, QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 #20 0x7ac668b83f7f in QCoreApplication::notifyInternal2(QObject*, QEvent*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1109:24 #21 0x7ac668b879e4 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1904:36 #22 0x7ac668e7d416 in 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TLuaInterpreter::feedTriggers(lua_State*) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xdf2d5b) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #9 0x7ac66942ffa0 in luaD_precall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:320:10 #10 0x7ac66943ad7a in luaV_execute /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lvm.c:591:17 #11 0x7ac66942e96c in luaD_call /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:378:5 #12 0x7ac66942af70 in luaD_rawrunprotected /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:116:3 #13 0x7ac66942bb94 in luaD_pcall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:464:12 #14 0x7ac66942bce0 in lua_pcall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lapi.c:821:12 #15 0x589b64fd65f1 in TLuaInterpreter::call(QString const&, QString const&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe2a5f1) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #16 0x589b65d84d31 in TAlias::execute() (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8d31) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) 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T0 here: #0 0x589b64a9b171 in operator new(unsigned long) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x8ef171) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #1 0x589b6500f595 in TLuaInterpreter::startTempAlias(QString const&, QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe63595) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #2 0x589b6512c41d in TLuaInterpreter::tempAlias(lua_State*) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xf8041d) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #3 0x7ac66942ffa0 in luaD_precall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:320:10 #4 0x7ac66943ad7a in luaV_execute /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lvm.c:591:17 #5 0x7ac66942e96c in luaD_call /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:378:5 #6 0x7ac66942af70 in luaD_rawrunprotected /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:116:3 #7 0x7ac66942bb94 in luaD_pcall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:464:12 #8 0x7ac66942bce0 in lua_pcall /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lapi.c:821:12 #9 0x589b64fd65f1 in TLuaInterpreter::call(QString const&, QString const&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe2a5f1) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #10 0x589b65d84d31 in TAlias::execute() (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8d31) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #11 0x589b65d84577 in TAlias::match(QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8577) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #12 0x589b6560c156 in AliasUnit::processDataStream(QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1460156) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #13 0x589b65c872b4 in Host::send(QString, bool, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1adb2b4) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #14 0x589b65d96517 in TCommandLine::enterCommand(QKeyEvent*) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bea517) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #15 0x589b65d93095 in TCommandLine::event(QEvent*) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1be7095) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) #16 0x7ac668391c8a in QApplicationPrivate::notify_helper(QObject*, QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 SUMMARY: AddressSanitizer: heap-use-after-free (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe8a7f5) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) in Tree<TAlias>::isActive() const Shadow bytes around the buggy address: 0x51200086e400: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e480: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa 0x51200086e500: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd 0x51200086e580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e600: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa =>0x51200086e680: fa fa fa fa fa fa fa fa fd fd[fd]fd fd fd fd fd 0x51200086e700: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e780: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa 0x51200086e800: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd 0x51200086e880: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e900: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==617553==ABORTING Co-authored-by: Vadim Peretokin <vadi2@users.noreply.github.com>

…rocessing (#8571)  Fix: heap-use-after-free when cleanup runs during alias/trigger/key processing Fixes crash when running #8559 (comment) benchmark on Linux. ==617553==ERROR: AddressSanitizer: heap-use-after-free on address 0x51200086e6d0 at pc 0x589b650367f6 bp 0x7ffc44dbc700 sp 0x7ffc44dbc6f8 READ of size 8 at 0x51200086e6d0 thread T0 (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe8a7f5) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd5408) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1460156) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1adb2b4) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bea517) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1be7095) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:2725:39 QEvent*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1109:24 /home/qt/work/qt/qtbase/src/widgets/kernel/qwidgetwindow.cpp:285:23 QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 QEvent*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1109:24 QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) /home/qt/work/qt/qtbase/src/gui/kernel/qguiapplication.cpp:2609:46 QIBusPlatformInputContext::filterEventFinished(QDBusPendingCallWatcher*) /home/qt/work/qt/qtbase/src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.cpp:523:57 /home/qt/work/qt/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461:57 /home/qt/work/qt/qtbase/src/corelib/kernel/qobject.cpp:4255:30 QDBusPendingCallWatcher*>(QObject*, QMetaObject const*, int, void*, QDBusPendingCallWatcher* const&) /home/qt/work/qt/qtbase/src/corelib/kernel/qobjectdefs.h:319:17 QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) /home/qt/work/qt/qtbase_build/src/dbus/DBus_autogen/include/moc_qdbuspendingcall.cpp:137:32 /home/qt/work/qt/qtbase/src/corelib/kernel/qobject.cpp:1411:31 QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 QEvent*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1109:24 QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1904:36 /home/qt/work/qt/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:246:39 (BuildId: 1eb6131419edb83b2178b682829a6913cf682d75) (BuildId: 1eb6131419edb83b2178b682829a6913cf682d75) (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5ca62) (BuildId: 1eb6131419edb83b2178b682829a6913cf682d75) QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) /home/qt/work/qt/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:399:43 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) /home/qt/work/qt/qtbase/src/corelib/kernel/qeventloop.cpp:186:22 /home/qt/work/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1452:36 (/home/vadi/Programs/Mudlet/build/src/mudlet+0x904675) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) csu/../sysdeps/nptl/libc_start_call_main.h:58:16 (/home/vadi/Programs/Mudlet/build/src/mudlet+0x815d04) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) 0x51200086e6d0 is located 16 bytes inside of 296-byte region [0x51200086e6c0,0x51200086e7e8) freed by thread T0 here: (/home/vadi/Programs/Mudlet/build/src/mudlet+0x8ef9f1) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd4711) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1462efc) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1ae288d) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x100b3b5) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xc8dc4b) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) TBuffer::translateToPlainText(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xc7cd4e) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) TMainConsole::printOnDisplay(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x100a38d) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xdf2d5b) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:320:10 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lvm.c:591:17 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:378:5 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:116:3 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:464:12 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lapi.c:821:12 const&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe2a5f1) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8d31) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8577) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1460156) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1adb2b4) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bea517) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1be7095) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 previously allocated by thread T0 here: (/home/vadi/Programs/Mudlet/build/src/mudlet+0x8ef171) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) QString const&) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe63595) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xf8041d) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:320:10 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lvm.c:591:17 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:378:5 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:116:3 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/ldo.c:464:12 /build/lua5.1-rMDsVj/lua5.1-5.1.5/src/lapi.c:821:12 const&, bool) (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe2a5f1) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8d31) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bd8577) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1460156) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1adb2b4) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1bea517) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) (/home/vadi/Programs/Mudlet/build/src/mudlet+0x1be7095) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) QEvent*) /home/qt/work/qt/qtbase/src/widgets/kernel/qapplication.cpp:3307:31 SUMMARY: AddressSanitizer: heap-use-after-free (/home/vadi/Programs/Mudlet/build/src/mudlet+0xe8a7f5) (BuildId: c98a5e4208b6daa52aa1b083c4ee6c4ab4552cc4) in Tree<TAlias>::isActive() const Shadow bytes around the buggy address: 0x51200086e400: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e480: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa 0x51200086e500: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd 0x51200086e580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e600: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa =>0x51200086e680: fa fa fa fa fa fa fa fa fd fd[fd]fd fd fd fd fd 0x51200086e700: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e780: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa 0x51200086e800: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd 0x51200086e880: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd 0x51200086e900: fd fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==617553==ABORTING Co-authored-by: Vadim Peretokin <vadi2@users.noreply.github.com>

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mpconley self-assigned this Nov 20, 2025

mpconley marked this pull request as ready for review November 21, 2025 00:22

mpconley requested a review from a team as a code owner November 21, 2025 00:22

Merge branch 'development' into improve/cleanup-use-qset

07b9e28

vadi2 approved these changes Nov 21, 2025

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vadi2 mentioned this pull request Nov 22, 2025

Fix: heap-use-after-free when cleanup runs during alias/trigger/key processing #8571

Merged

vadi2 self-requested a review November 23, 2025 08:06

Merge branch 'development' into improve/cleanup-use-qset

a7abb35

mpconley changed the title ~~Fix: Improve performance of cleanup system in trigger/alias/key processing~~ Improve: Cleanup system efficiency for triggers, aliases, and keys Nov 23, 2025

vadi2 merged commit 360939d into Mudlet:development Nov 23, 2025
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mpconley deleted the improve/cleanup-use-qset branch November 23, 2025 15:44

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Brief overview of PR changes/additions

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Combined Before/After with Scaling Analysis

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