./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/valid-memsafety.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4a390ef5 Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4a390ef-m [2024-10-24 16:19:01,876 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-24 16:19:01,950 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2024-10-24 16:19:01,958 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-24 16:19:01,958 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-24 16:19:01,985 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-24 16:19:01,986 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-24 16:19:01,986 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-24 16:19:01,987 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-10-24 16:19:01,987 INFO L153 SettingsManager]: * Use memory slicer=true [2024-10-24 16:19:01,988 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-24 16:19:01,988 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-24 16:19:01,989 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-24 16:19:01,989 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-24 16:19:01,989 INFO L153 SettingsManager]: * Use SBE=true [2024-10-24 16:19:01,990 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-24 16:19:01,990 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-24 16:19:01,991 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-24 16:19:01,991 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-24 16:19:01,991 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-24 16:19:01,992 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2024-10-24 16:19:02,005 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2024-10-24 16:19:02,006 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2024-10-24 16:19:02,006 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-24 16:19:02,006 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-10-24 16:19:02,006 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-24 16:19:02,007 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2024-10-24 16:19:02,007 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-24 16:19:02,007 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-24 16:19:02,007 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-24 16:19:02,008 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-24 16:19:02,008 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-10-24 16:19:02,010 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-24 16:19:02,011 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 16:19:02,011 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-24 16:19:02,011 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-24 16:19:02,012 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-24 16:19:02,012 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-24 16:19:02,012 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-24 16:19:02,012 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-24 16:19:02,012 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-24 16:19:02,013 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-24 16:19:02,013 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 [2024-10-24 16:19:02,264 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-24 16:19:02,289 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-24 16:19:02,293 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-24 16:19:02,294 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-24 16:19:02,295 INFO L274 PluginConnector]: CDTParser initialized [2024-10-24 16:19:02,296 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2024-10-24 16:19:03,723 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-24 16:19:03,952 INFO L384 CDTParser]: Found 1 translation units. [2024-10-24 16:19:03,953 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2024-10-24 16:19:03,964 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1237260ac/0ed2062a2b7f4a158d03b697cd0f59ea/FLAG80df77c71 [2024-10-24 16:19:03,979 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1237260ac/0ed2062a2b7f4a158d03b697cd0f59ea [2024-10-24 16:19:03,982 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-24 16:19:03,984 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-24 16:19:03,987 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-24 16:19:03,988 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-24 16:19:03,994 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-24 16:19:03,995 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 04:19:03" (1/1) ... [2024-10-24 16:19:03,997 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@307dbb87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:03, skipping insertion in model container [2024-10-24 16:19:03,997 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 04:19:03" (1/1) ... [2024-10-24 16:19:04,038 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-24 16:19:04,387 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 16:19:04,397 INFO L200 MainTranslator]: Completed pre-run [2024-10-24 16:19:04,447 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 16:19:04,475 INFO L204 MainTranslator]: Completed translation [2024-10-24 16:19:04,476 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04 WrapperNode [2024-10-24 16:19:04,476 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-24 16:19:04,477 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-24 16:19:04,477 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-24 16:19:04,477 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-24 16:19:04,484 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,500 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,521 INFO L138 Inliner]: procedures = 123, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 102 [2024-10-24 16:19:04,522 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-24 16:19:04,523 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-24 16:19:04,523 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-24 16:19:04,523 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-24 16:19:04,534 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,535 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,544 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,561 INFO L175 MemorySlicer]: Split 25 memory accesses to 3 slices as follows [2, 10, 13]. 52 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0]. The 13 writes are split as follows [0, 6, 7]. [2024-10-24 16:19:04,562 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,562 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,570 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,573 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,575 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,577 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,579 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-24 16:19:04,580 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-24 16:19:04,580 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-24 16:19:04,581 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-24 16:19:04,582 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (1/1) ... [2024-10-24 16:19:04,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 16:19:04,605 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:04,623 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-10-24 16:19:04,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-10-24 16:19:04,676 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#0 [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#1 [2024-10-24 16:19:04,677 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#2 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#0 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#1 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#2 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-24 16:19:04,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-24 16:19:04,678 INFO L130 BoogieDeclarations]: Found specification of procedure append [2024-10-24 16:19:04,679 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2024-10-24 16:19:04,802 INFO L238 CfgBuilder]: Building ICFG [2024-10-24 16:19:04,804 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-24 16:19:05,220 INFO L? ?]: Removed 128 outVars from TransFormulas that were not future-live. [2024-10-24 16:19:05,220 INFO L287 CfgBuilder]: Performing block encoding [2024-10-24 16:19:05,284 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-24 16:19:05,284 INFO L314 CfgBuilder]: Removed 4 assume(true) statements. [2024-10-24 16:19:05,284 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 04:19:05 BoogieIcfgContainer [2024-10-24 16:19:05,285 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-24 16:19:05,287 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-24 16:19:05,287 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-24 16:19:05,292 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-24 16:19:05,292 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 04:19:03" (1/3) ... [2024-10-24 16:19:05,293 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239603ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 04:19:05, skipping insertion in model container [2024-10-24 16:19:05,293 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 04:19:04" (2/3) ... [2024-10-24 16:19:05,293 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239603ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 04:19:05, skipping insertion in model container [2024-10-24 16:19:05,293 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 04:19:05" (3/3) ... [2024-10-24 16:19:05,294 INFO L112 eAbstractionObserver]: Analyzing ICFG length_test03-1.i [2024-10-24 16:19:05,310 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-24 16:19:05,311 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2024-10-24 16:19:05,356 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-24 16:19:05,362 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=None, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@71bcea58, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-24 16:19:05,362 INFO L334 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2024-10-24 16:19:05,366 INFO L276 IsEmpty]: Start isEmpty. Operand has 113 states, 50 states have (on average 2.38) internal successors, (119), 109 states have internal predecessors, (119), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:05,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2024-10-24 16:19:05,371 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:05,371 INFO L215 NwaCegarLoop]: trace histogram [1, 1] [2024-10-24 16:19:05,371 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:05,376 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:05,376 INFO L85 PathProgramCache]: Analyzing trace with hash 7010, now seen corresponding path program 1 times [2024-10-24 16:19:05,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:05,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514790526] [2024-10-24 16:19:05,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:05,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:05,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:05,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:05,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:05,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514790526] [2024-10-24 16:19:05,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514790526] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:05,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:05,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-24 16:19:05,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250835112] [2024-10-24 16:19:05,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:05,575 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:05,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:05,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:05,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:05,598 INFO L87 Difference]: Start difference. First operand has 113 states, 50 states have (on average 2.38) internal successors, (119), 109 states have internal predecessors, (119), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:05,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:05,847 INFO L93 Difference]: Finished difference Result 146 states and 155 transitions. [2024-10-24 16:19:05,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:05,850 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2024-10-24 16:19:05,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:05,858 INFO L225 Difference]: With dead ends: 146 [2024-10-24 16:19:05,859 INFO L226 Difference]: Without dead ends: 145 [2024-10-24 16:19:05,860 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:05,864 INFO L432 NwaCegarLoop]: 84 mSDtfsCounter, 43 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:05,865 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 133 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 16:19:05,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2024-10-24 16:19:05,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 110. [2024-10-24 16:19:05,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 50 states have (on average 2.24) internal successors, (112), 106 states have internal predecessors, (112), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:05,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 116 transitions. [2024-10-24 16:19:05,902 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 116 transitions. Word has length 2 [2024-10-24 16:19:05,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:05,902 INFO L471 AbstractCegarLoop]: Abstraction has 110 states and 116 transitions. [2024-10-24 16:19:05,902 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:05,902 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 116 transitions. [2024-10-24 16:19:05,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2024-10-24 16:19:05,903 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:05,903 INFO L215 NwaCegarLoop]: trace histogram [1, 1] [2024-10-24 16:19:05,903 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-24 16:19:05,904 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:05,904 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:05,904 INFO L85 PathProgramCache]: Analyzing trace with hash 7011, now seen corresponding path program 1 times [2024-10-24 16:19:05,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:05,905 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161330827] [2024-10-24 16:19:05,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:05,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:05,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:06,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:06,017 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:06,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161330827] [2024-10-24 16:19:06,017 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161330827] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:06,017 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:06,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2024-10-24 16:19:06,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316387341] [2024-10-24 16:19:06,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:06,021 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:06,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:06,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:06,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,023 INFO L87 Difference]: Start difference. First operand 110 states and 116 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:06,150 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2024-10-24 16:19:06,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:06,151 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2024-10-24 16:19:06,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:06,152 INFO L225 Difference]: With dead ends: 110 [2024-10-24 16:19:06,152 INFO L226 Difference]: Without dead ends: 110 [2024-10-24 16:19:06,152 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,153 INFO L432 NwaCegarLoop]: 94 mSDtfsCounter, 8 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:06,153 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 148 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:06,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2024-10-24 16:19:06,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2024-10-24 16:19:06,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 50 states have (on average 2.2) internal successors, (110), 104 states have internal predecessors, (110), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:06,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 114 transitions. [2024-10-24 16:19:06,173 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 114 transitions. Word has length 2 [2024-10-24 16:19:06,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:06,173 INFO L471 AbstractCegarLoop]: Abstraction has 108 states and 114 transitions. [2024-10-24 16:19:06,174 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,174 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 114 transitions. [2024-10-24 16:19:06,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2024-10-24 16:19:06,174 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:06,175 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2024-10-24 16:19:06,175 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-10-24 16:19:06,175 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:06,176 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:06,176 INFO L85 PathProgramCache]: Analyzing trace with hash 6741643, now seen corresponding path program 1 times [2024-10-24 16:19:06,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:06,176 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805977260] [2024-10-24 16:19:06,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:06,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:06,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:06,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:06,281 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:06,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805977260] [2024-10-24 16:19:06,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805977260] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:06,282 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:06,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-24 16:19:06,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184971646] [2024-10-24 16:19:06,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:06,282 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:06,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:06,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:06,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,284 INFO L87 Difference]: Start difference. First operand 108 states and 114 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:06,388 INFO L93 Difference]: Finished difference Result 123 states and 132 transitions. [2024-10-24 16:19:06,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:06,389 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2024-10-24 16:19:06,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:06,390 INFO L225 Difference]: With dead ends: 123 [2024-10-24 16:19:06,390 INFO L226 Difference]: Without dead ends: 123 [2024-10-24 16:19:06,391 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,392 INFO L432 NwaCegarLoop]: 87 mSDtfsCounter, 20 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:06,392 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 136 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:06,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2024-10-24 16:19:06,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 111. [2024-10-24 16:19:06,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 55 states have (on average 2.109090909090909) internal successors, (116), 107 states have internal predecessors, (116), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:06,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 120 transitions. [2024-10-24 16:19:06,404 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 120 transitions. Word has length 4 [2024-10-24 16:19:06,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:06,404 INFO L471 AbstractCegarLoop]: Abstraction has 111 states and 120 transitions. [2024-10-24 16:19:06,405 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,405 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 120 transitions. [2024-10-24 16:19:06,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2024-10-24 16:19:06,405 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:06,405 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2024-10-24 16:19:06,405 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2024-10-24 16:19:06,406 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:06,406 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:06,409 INFO L85 PathProgramCache]: Analyzing trace with hash 6741644, now seen corresponding path program 1 times [2024-10-24 16:19:06,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:06,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924881623] [2024-10-24 16:19:06,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:06,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:06,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:06,532 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:06,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:06,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924881623] [2024-10-24 16:19:06,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924881623] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:06,533 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:06,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-24 16:19:06,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073876397] [2024-10-24 16:19:06,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:06,534 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:06,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:06,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:06,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,535 INFO L87 Difference]: Start difference. First operand 111 states and 120 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:06,630 INFO L93 Difference]: Finished difference Result 111 states and 121 transitions. [2024-10-24 16:19:06,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:06,631 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2024-10-24 16:19:06,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:06,632 INFO L225 Difference]: With dead ends: 111 [2024-10-24 16:19:06,632 INFO L226 Difference]: Without dead ends: 111 [2024-10-24 16:19:06,632 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,633 INFO L432 NwaCegarLoop]: 93 mSDtfsCounter, 3 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:06,634 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 147 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:06,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2024-10-24 16:19:06,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2024-10-24 16:19:06,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 105 states have internal predecessors, (114), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:06,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 118 transitions. [2024-10-24 16:19:06,649 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 118 transitions. Word has length 4 [2024-10-24 16:19:06,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:06,649 INFO L471 AbstractCegarLoop]: Abstraction has 109 states and 118 transitions. [2024-10-24 16:19:06,650 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,650 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 118 transitions. [2024-10-24 16:19:06,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-10-24 16:19:06,650 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:06,650 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:06,651 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-10-24 16:19:06,651 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:06,651 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:06,652 INFO L85 PathProgramCache]: Analyzing trace with hash 430090240, now seen corresponding path program 1 times [2024-10-24 16:19:06,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:06,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967332862] [2024-10-24 16:19:06,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:06,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:06,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:06,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:06,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:06,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967332862] [2024-10-24 16:19:06,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967332862] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:06,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:06,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-24 16:19:06,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028613907] [2024-10-24 16:19:06,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:06,753 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:06,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:06,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:06,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,754 INFO L87 Difference]: Start difference. First operand 109 states and 118 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:06,846 INFO L93 Difference]: Finished difference Result 104 states and 113 transitions. [2024-10-24 16:19:06,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:06,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2024-10-24 16:19:06,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:06,847 INFO L225 Difference]: With dead ends: 104 [2024-10-24 16:19:06,847 INFO L226 Difference]: Without dead ends: 104 [2024-10-24 16:19:06,848 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,849 INFO L432 NwaCegarLoop]: 67 mSDtfsCounter, 31 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:06,849 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 105 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:06,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2024-10-24 16:19:06,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2024-10-24 16:19:06,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 55 states have (on average 1.981818181818182) internal successors, (109), 100 states have internal predecessors, (109), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:06,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 113 transitions. [2024-10-24 16:19:06,861 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 113 transitions. Word has length 9 [2024-10-24 16:19:06,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:06,861 INFO L471 AbstractCegarLoop]: Abstraction has 104 states and 113 transitions. [2024-10-24 16:19:06,861 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:06,861 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 113 transitions. [2024-10-24 16:19:06,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-10-24 16:19:06,862 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:06,862 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:06,862 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-10-24 16:19:06,862 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:06,862 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:06,862 INFO L85 PathProgramCache]: Analyzing trace with hash 430090241, now seen corresponding path program 1 times [2024-10-24 16:19:06,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:06,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217984773] [2024-10-24 16:19:06,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:06,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:06,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:06,957 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:06,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217984773] [2024-10-24 16:19:06,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217984773] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:06,957 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:06,957 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-10-24 16:19:06,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959686724] [2024-10-24 16:19:06,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:06,958 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:06,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:06,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:06,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:06,959 INFO L87 Difference]: Start difference. First operand 104 states and 113 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:07,031 INFO L93 Difference]: Finished difference Result 99 states and 108 transitions. [2024-10-24 16:19:07,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:07,032 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2024-10-24 16:19:07,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:07,034 INFO L225 Difference]: With dead ends: 99 [2024-10-24 16:19:07,034 INFO L226 Difference]: Without dead ends: 99 [2024-10-24 16:19:07,034 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 16:19:07,035 INFO L432 NwaCegarLoop]: 67 mSDtfsCounter, 31 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:07,035 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 113 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:07,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2024-10-24 16:19:07,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2024-10-24 16:19:07,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 55 states have (on average 1.8909090909090909) internal successors, (104), 95 states have internal predecessors, (104), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:07,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2024-10-24 16:19:07,046 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 9 [2024-10-24 16:19:07,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:07,046 INFO L471 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2024-10-24 16:19:07,047 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,047 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2024-10-24 16:19:07,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-10-24 16:19:07,047 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:07,048 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:07,048 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2024-10-24 16:19:07,048 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:07,048 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:07,049 INFO L85 PathProgramCache]: Analyzing trace with hash 447895653, now seen corresponding path program 1 times [2024-10-24 16:19:07,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:07,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020309904] [2024-10-24 16:19:07,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:07,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:07,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:07,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:07,276 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:07,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020309904] [2024-10-24 16:19:07,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020309904] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:07,277 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:07,277 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-10-24 16:19:07,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452719977] [2024-10-24 16:19:07,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:07,277 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-10-24 16:19:07,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:07,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-10-24 16:19:07,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2024-10-24 16:19:07,278 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:07,518 INFO L93 Difference]: Finished difference Result 191 states and 212 transitions. [2024-10-24 16:19:07,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-10-24 16:19:07,518 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2024-10-24 16:19:07,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:07,519 INFO L225 Difference]: With dead ends: 191 [2024-10-24 16:19:07,519 INFO L226 Difference]: Without dead ends: 191 [2024-10-24 16:19:07,519 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2024-10-24 16:19:07,520 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 199 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:07,520 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 157 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 16:19:07,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2024-10-24 16:19:07,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 125. [2024-10-24 16:19:07,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 86 states have (on average 1.7906976744186047) internal successors, (154), 120 states have internal predecessors, (154), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:07,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 158 transitions. [2024-10-24 16:19:07,532 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 158 transitions. Word has length 10 [2024-10-24 16:19:07,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:07,532 INFO L471 AbstractCegarLoop]: Abstraction has 125 states and 158 transitions. [2024-10-24 16:19:07,532 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,532 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 158 transitions. [2024-10-24 16:19:07,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-10-24 16:19:07,533 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:07,533 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:07,533 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2024-10-24 16:19:07,533 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:07,534 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:07,534 INFO L85 PathProgramCache]: Analyzing trace with hash 447895654, now seen corresponding path program 1 times [2024-10-24 16:19:07,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:07,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520197439] [2024-10-24 16:19:07,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:07,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:07,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:07,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:07,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:07,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520197439] [2024-10-24 16:19:07,782 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520197439] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:07,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:07,782 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-10-24 16:19:07,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299458549] [2024-10-24 16:19:07,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:07,783 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-10-24 16:19:07,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:07,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-10-24 16:19:07,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2024-10-24 16:19:07,783 INFO L87 Difference]: Start difference. First operand 125 states and 158 transitions. Second operand has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:07,979 INFO L93 Difference]: Finished difference Result 143 states and 179 transitions. [2024-10-24 16:19:07,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-10-24 16:19:07,979 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2024-10-24 16:19:07,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:07,980 INFO L225 Difference]: With dead ends: 143 [2024-10-24 16:19:07,980 INFO L226 Difference]: Without dead ends: 143 [2024-10-24 16:19:07,980 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2024-10-24 16:19:07,981 INFO L432 NwaCegarLoop]: 67 mSDtfsCounter, 19 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:07,981 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 240 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 16:19:07,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2024-10-24 16:19:07,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2024-10-24 16:19:07,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 101 states have (on average 1.7128712871287128) internal successors, (173), 135 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 16:19:07,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 179 transitions. [2024-10-24 16:19:07,995 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 179 transitions. Word has length 10 [2024-10-24 16:19:07,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:07,995 INFO L471 AbstractCegarLoop]: Abstraction has 141 states and 179 transitions. [2024-10-24 16:19:07,996 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:07,996 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 179 transitions. [2024-10-24 16:19:07,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-10-24 16:19:07,996 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:07,996 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:07,996 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2024-10-24 16:19:07,996 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:07,997 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:07,997 INFO L85 PathProgramCache]: Analyzing trace with hash 2063437293, now seen corresponding path program 1 times [2024-10-24 16:19:07,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:07,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210771775] [2024-10-24 16:19:07,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:07,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:08,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:08,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:08,392 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:08,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210771775] [2024-10-24 16:19:08,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210771775] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:08,392 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:08,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-10-24 16:19:08,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841549995] [2024-10-24 16:19:08,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:08,396 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-10-24 16:19:08,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:08,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-10-24 16:19:08,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2024-10-24 16:19:08,397 INFO L87 Difference]: Start difference. First operand 141 states and 179 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:08,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:08,623 INFO L93 Difference]: Finished difference Result 143 states and 178 transitions. [2024-10-24 16:19:08,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-10-24 16:19:08,623 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2024-10-24 16:19:08,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:08,624 INFO L225 Difference]: With dead ends: 143 [2024-10-24 16:19:08,624 INFO L226 Difference]: Without dead ends: 143 [2024-10-24 16:19:08,625 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2024-10-24 16:19:08,626 INFO L432 NwaCegarLoop]: 71 mSDtfsCounter, 28 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:08,626 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 422 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 16:19:08,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2024-10-24 16:19:08,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2024-10-24 16:19:08,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 101 states have (on average 1.702970297029703) internal successors, (172), 135 states have internal predecessors, (172), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 16:19:08,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 178 transitions. [2024-10-24 16:19:08,636 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 178 transitions. Word has length 17 [2024-10-24 16:19:08,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:08,638 INFO L471 AbstractCegarLoop]: Abstraction has 141 states and 178 transitions. [2024-10-24 16:19:08,638 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:08,638 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 178 transitions. [2024-10-24 16:19:08,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-10-24 16:19:08,639 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:08,639 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:08,639 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2024-10-24 16:19:08,639 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:08,640 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:08,640 INFO L85 PathProgramCache]: Analyzing trace with hash -359770512, now seen corresponding path program 1 times [2024-10-24 16:19:08,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:08,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422433845] [2024-10-24 16:19:08,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:08,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:08,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:09,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:09,063 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:09,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422433845] [2024-10-24 16:19:09,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422433845] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:09,064 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:09,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-10-24 16:19:09,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44773950] [2024-10-24 16:19:09,064 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:09,065 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-10-24 16:19:09,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:09,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-10-24 16:19:09,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2024-10-24 16:19:09,065 INFO L87 Difference]: Start difference. First operand 141 states and 178 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:09,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:09,318 INFO L93 Difference]: Finished difference Result 166 states and 201 transitions. [2024-10-24 16:19:09,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-10-24 16:19:09,318 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-10-24 16:19:09,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:09,319 INFO L225 Difference]: With dead ends: 166 [2024-10-24 16:19:09,319 INFO L226 Difference]: Without dead ends: 166 [2024-10-24 16:19:09,319 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2024-10-24 16:19:09,321 INFO L432 NwaCegarLoop]: 60 mSDtfsCounter, 128 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:09,321 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 341 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 16:19:09,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2024-10-24 16:19:09,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 134. [2024-10-24 16:19:09,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 95 states have (on average 1.694736842105263) internal successors, (161), 128 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 16:19:09,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 167 transitions. [2024-10-24 16:19:09,326 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 167 transitions. Word has length 18 [2024-10-24 16:19:09,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:09,326 INFO L471 AbstractCegarLoop]: Abstraction has 134 states and 167 transitions. [2024-10-24 16:19:09,326 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-10-24 16:19:09,327 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 167 transitions. [2024-10-24 16:19:09,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-10-24 16:19:09,327 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:09,329 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:09,329 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2024-10-24 16:19:09,329 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:09,330 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:09,330 INFO L85 PathProgramCache]: Analyzing trace with hash -2074640197, now seen corresponding path program 1 times [2024-10-24 16:19:09,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:09,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298743485] [2024-10-24 16:19:09,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:09,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:09,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:09,398 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:09,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:09,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:09,411 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:09,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298743485] [2024-10-24 16:19:09,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298743485] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:09,412 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 16:19:09,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-10-24 16:19:09,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365930463] [2024-10-24 16:19:09,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:09,413 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-10-24 16:19:09,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:09,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-10-24 16:19:09,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-10-24 16:19:09,414 INFO L87 Difference]: Start difference. First operand 134 states and 167 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 16:19:09,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:09,518 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2024-10-24 16:19:09,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-10-24 16:19:09,518 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2024-10-24 16:19:09,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:09,519 INFO L225 Difference]: With dead ends: 128 [2024-10-24 16:19:09,519 INFO L226 Difference]: Without dead ends: 128 [2024-10-24 16:19:09,519 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-10-24 16:19:09,520 INFO L432 NwaCegarLoop]: 74 mSDtfsCounter, 10 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:09,520 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 176 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:09,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2024-10-24 16:19:09,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 117. [2024-10-24 16:19:09,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 78 states have (on average 1.641025641025641) internal successors, (128), 111 states have internal predecessors, (128), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 16:19:09,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 134 transitions. [2024-10-24 16:19:09,524 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 134 transitions. Word has length 24 [2024-10-24 16:19:09,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:09,524 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 134 transitions. [2024-10-24 16:19:09,525 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-10-24 16:19:09,525 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 134 transitions. [2024-10-24 16:19:09,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-10-24 16:19:09,525 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:09,526 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:09,526 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2024-10-24 16:19:09,526 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:09,527 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:09,527 INFO L85 PathProgramCache]: Analyzing trace with hash -814814194, now seen corresponding path program 1 times [2024-10-24 16:19:09,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:09,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741137131] [2024-10-24 16:19:09,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:09,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:09,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:09,786 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:09,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:09,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:09,903 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:09,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741137131] [2024-10-24 16:19:09,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741137131] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:09,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957353544] [2024-10-24 16:19:09,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:09,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:09,904 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:09,906 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:09,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-10-24 16:19:10,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:10,041 INFO L255 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-10-24 16:19:10,046 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:10,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:10,326 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-10-24 16:19:10,342 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:19:10,343 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:19:10,365 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:10,365 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:10,698 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 45 [2024-10-24 16:19:10,725 INFO L349 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2024-10-24 16:19:10,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 49 [2024-10-24 16:19:10,875 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:19:10,875 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 33 [2024-10-24 16:19:11,018 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:19:11,019 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 76 [2024-10-24 16:19:11,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:11,102 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957353544] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:11,102 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:11,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 23 [2024-10-24 16:19:11,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257668657] [2024-10-24 16:19:11,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:11,103 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-10-24 16:19:11,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:11,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-10-24 16:19:11,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2024-10-24 16:19:11,105 INFO L87 Difference]: Start difference. First operand 117 states and 134 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 19 states have internal predecessors, (63), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:11,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:11,929 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2024-10-24 16:19:11,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-10-24 16:19:11,930 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 19 states have internal predecessors, (63), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2024-10-24 16:19:11,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:11,931 INFO L225 Difference]: With dead ends: 147 [2024-10-24 16:19:11,931 INFO L226 Difference]: Without dead ends: 147 [2024-10-24 16:19:11,932 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2024-10-24 16:19:11,932 INFO L432 NwaCegarLoop]: 38 mSDtfsCounter, 322 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 726 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:11,932 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 431 Invalid, 760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 726 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-10-24 16:19:11,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2024-10-24 16:19:11,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 116. [2024-10-24 16:19:11,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 80 states have (on average 1.5125) internal successors, (121), 110 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-24 16:19:11,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 127 transitions. [2024-10-24 16:19:11,938 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 127 transitions. Word has length 26 [2024-10-24 16:19:11,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:11,940 INFO L471 AbstractCegarLoop]: Abstraction has 116 states and 127 transitions. [2024-10-24 16:19:11,940 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 19 states have internal predecessors, (63), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:11,940 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 127 transitions. [2024-10-24 16:19:11,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-10-24 16:19:11,941 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:11,942 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:11,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:12,146 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-10-24 16:19:12,147 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:12,147 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:12,147 INFO L85 PathProgramCache]: Analyzing trace with hash -1020783995, now seen corresponding path program 1 times [2024-10-24 16:19:12,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:12,148 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992100074] [2024-10-24 16:19:12,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:12,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:12,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:12,372 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:12,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:12,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:12,489 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:12,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992100074] [2024-10-24 16:19:12,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992100074] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:12,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728675673] [2024-10-24 16:19:12,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:12,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:12,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:12,491 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:12,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-10-24 16:19:12,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:12,621 INFO L255 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-10-24 16:19:12,623 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:12,626 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:12,649 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base (select |c_#valid| append_~node~0.base))))) is different from true [2024-10-24 16:19:12,714 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2024-10-24 16:19:12,714 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2024-10-24 16:19:12,736 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2024-10-24 16:19:12,737 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2024-10-24 16:19:12,747 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2024-10-24 16:19:12,748 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:12,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728675673] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:12,811 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:12,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2024-10-24 16:19:12,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290897839] [2024-10-24 16:19:12,811 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:12,811 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-10-24 16:19:12,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:12,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-10-24 16:19:12,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=86, Unknown=1, NotChecked=18, Total=132 [2024-10-24 16:19:12,812 INFO L87 Difference]: Start difference. First operand 116 states and 127 transitions. Second operand has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-24 16:19:13,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:13,241 INFO L93 Difference]: Finished difference Result 144 states and 156 transitions. [2024-10-24 16:19:13,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-10-24 16:19:13,242 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 27 [2024-10-24 16:19:13,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:13,243 INFO L225 Difference]: With dead ends: 144 [2024-10-24 16:19:13,243 INFO L226 Difference]: Without dead ends: 144 [2024-10-24 16:19:13,243 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 1 IntricatePredicates, 2 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=100, Invalid=283, Unknown=1, NotChecked=36, Total=420 [2024-10-24 16:19:13,244 INFO L432 NwaCegarLoop]: 52 mSDtfsCounter, 97 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:13,244 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 261 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 340 Invalid, 0 Unknown, 123 Unchecked, 0.2s Time] [2024-10-24 16:19:13,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2024-10-24 16:19:13,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 119. [2024-10-24 16:19:13,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 83 states have (on average 1.5060240963855422) internal successors, (125), 113 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2024-10-24 16:19:13,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 132 transitions. [2024-10-24 16:19:13,248 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 132 transitions. Word has length 27 [2024-10-24 16:19:13,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:13,249 INFO L471 AbstractCegarLoop]: Abstraction has 119 states and 132 transitions. [2024-10-24 16:19:13,249 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.7) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-24 16:19:13,249 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 132 transitions. [2024-10-24 16:19:13,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-10-24 16:19:13,250 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:13,250 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:13,268 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:13,450 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-10-24 16:19:13,451 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:13,451 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:13,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1020783994, now seen corresponding path program 1 times [2024-10-24 16:19:13,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:13,451 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983820670] [2024-10-24 16:19:13,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:13,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:13,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:13,731 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:13,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:13,818 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:13,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:13,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983820670] [2024-10-24 16:19:13,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983820670] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:13,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649758837] [2024-10-24 16:19:13,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:13,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:13,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:13,821 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:13,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-10-24 16:19:13,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:13,961 INFO L255 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-10-24 16:19:13,965 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:13,972 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-10-24 16:19:13,976 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:14,050 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (store |c_old(#length)| append_~node~0.base (select |c_#length| append_~node~0.base)) |c_#length|) (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1)))) is different from true [2024-10-24 16:19:14,151 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2024-10-24 16:19:14,152 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2024-10-24 16:19:14,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2024-10-24 16:19:14,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:14,286 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2024-10-24 16:19:14,299 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2024-10-24 16:19:14,300 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2024-10-24 16:19:14,321 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2024-10-24 16:19:14,321 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:14,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649758837] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:14,600 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:14,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 14 [2024-10-24 16:19:14,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270705113] [2024-10-24 16:19:14,601 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:14,601 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-10-24 16:19:14,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:14,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-10-24 16:19:14,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=256, Unknown=1, NotChecked=32, Total=342 [2024-10-24 16:19:14,605 INFO L87 Difference]: Start difference. First operand 119 states and 132 transitions. Second operand has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:15,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:15,698 INFO L93 Difference]: Finished difference Result 260 states and 295 transitions. [2024-10-24 16:19:15,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-10-24 16:19:15,699 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2024-10-24 16:19:15,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:15,700 INFO L225 Difference]: With dead ends: 260 [2024-10-24 16:19:15,700 INFO L226 Difference]: Without dead ends: 260 [2024-10-24 16:19:15,701 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=168, Invalid=765, Unknown=1, NotChecked=58, Total=992 [2024-10-24 16:19:15,701 INFO L432 NwaCegarLoop]: 49 mSDtfsCounter, 206 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 214 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:15,702 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 411 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 729 Invalid, 0 Unknown, 214 Unchecked, 0.6s Time] [2024-10-24 16:19:15,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2024-10-24 16:19:15,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 180. [2024-10-24 16:19:15,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 140 states have (on average 1.5071428571428571) internal successors, (211), 169 states have internal predecessors, (211), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-24 16:19:15,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 225 transitions. [2024-10-24 16:19:15,711 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 225 transitions. Word has length 27 [2024-10-24 16:19:15,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:15,712 INFO L471 AbstractCegarLoop]: Abstraction has 180 states and 225 transitions. [2024-10-24 16:19:15,712 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:15,712 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 225 transitions. [2024-10-24 16:19:15,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-10-24 16:19:15,714 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:15,714 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:15,732 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:15,918 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:15,919 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:15,919 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:15,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1286927035, now seen corresponding path program 1 times [2024-10-24 16:19:15,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:15,920 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915720778] [2024-10-24 16:19:15,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:15,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:15,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:16,519 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:16,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:16,763 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:16,763 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:16,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915720778] [2024-10-24 16:19:16,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915720778] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:16,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427619831] [2024-10-24 16:19:16,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:16,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:16,764 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:16,766 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:16,767 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-10-24 16:19:16,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:16,925 INFO L255 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 43 conjuncts are in the unsatisfiable core [2024-10-24 16:19:16,929 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:16,938 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:16,945 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-10-24 16:19:17,059 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:17,066 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2024-10-24 16:19:17,173 INFO L349 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2024-10-24 16:19:17,174 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2024-10-24 16:19:17,184 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2024-10-24 16:19:17,239 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2024-10-24 16:19:17,244 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:17,244 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:17,629 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 70 [2024-10-24 16:19:17,634 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 94 [2024-10-24 16:19:17,665 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2024-10-24 16:19:17,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:17,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427619831] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:17,872 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:17,872 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 20 [2024-10-24 16:19:17,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682692112] [2024-10-24 16:19:17,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:17,873 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-10-24 16:19:17,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:17,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-10-24 16:19:17,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2024-10-24 16:19:17,874 INFO L87 Difference]: Start difference. First operand 180 states and 225 transitions. Second operand has 21 states, 20 states have (on average 4.15) internal successors, (83), 19 states have internal predecessors, (83), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:18,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:18,601 INFO L93 Difference]: Finished difference Result 189 states and 233 transitions. [2024-10-24 16:19:18,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-10-24 16:19:18,602 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 4.15) internal successors, (83), 19 states have internal predecessors, (83), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2024-10-24 16:19:18,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:18,603 INFO L225 Difference]: With dead ends: 189 [2024-10-24 16:19:18,603 INFO L226 Difference]: Without dead ends: 189 [2024-10-24 16:19:18,603 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=123, Invalid=689, Unknown=0, NotChecked=0, Total=812 [2024-10-24 16:19:18,604 INFO L432 NwaCegarLoop]: 57 mSDtfsCounter, 135 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:18,604 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 492 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-10-24 16:19:18,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2024-10-24 16:19:18,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 186. [2024-10-24 16:19:18,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 145 states have (on average 1.4827586206896552) internal successors, (215), 175 states have internal predecessors, (215), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-24 16:19:18,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 229 transitions. [2024-10-24 16:19:18,610 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 229 transitions. Word has length 33 [2024-10-24 16:19:18,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:18,610 INFO L471 AbstractCegarLoop]: Abstraction has 186 states and 229 transitions. [2024-10-24 16:19:18,610 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 4.15) internal successors, (83), 19 states have internal predecessors, (83), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:18,610 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 229 transitions. [2024-10-24 16:19:18,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-10-24 16:19:18,611 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:18,611 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:18,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:18,812 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-10-24 16:19:18,812 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:18,813 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:18,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1286927036, now seen corresponding path program 1 times [2024-10-24 16:19:18,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:18,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136410038] [2024-10-24 16:19:18,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:18,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:18,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:19,276 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:19,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:19,425 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:19,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:19,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136410038] [2024-10-24 16:19:19,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136410038] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:19,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015793664] [2024-10-24 16:19:19,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:19,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:19,426 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:19,428 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:19,429 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-10-24 16:19:19,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:19,589 INFO L255 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 31 conjuncts are in the unsatisfiable core [2024-10-24 16:19:19,595 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:19,604 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:19,657 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:19,709 INFO L349 Elim1Store]: treesize reduction 33, result has 25.0 percent of original size [2024-10-24 16:19:19,710 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 20 [2024-10-24 16:19:19,762 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2024-10-24 16:19:19,771 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:19,771 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:19,870 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2024-10-24 16:19:20,014 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:20,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015793664] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:20,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:20,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 18 [2024-10-24 16:19:20,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735203773] [2024-10-24 16:19:20,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:20,016 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-10-24 16:19:20,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:20,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-10-24 16:19:20,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2024-10-24 16:19:20,018 INFO L87 Difference]: Start difference. First operand 186 states and 229 transitions. Second operand has 19 states, 18 states have (on average 4.222222222222222) internal successors, (76), 17 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:20,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:20,503 INFO L93 Difference]: Finished difference Result 188 states and 232 transitions. [2024-10-24 16:19:20,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-10-24 16:19:20,503 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 4.222222222222222) internal successors, (76), 17 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2024-10-24 16:19:20,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:20,504 INFO L225 Difference]: With dead ends: 188 [2024-10-24 16:19:20,505 INFO L226 Difference]: Without dead ends: 188 [2024-10-24 16:19:20,505 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2024-10-24 16:19:20,505 INFO L432 NwaCegarLoop]: 58 mSDtfsCounter, 125 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:20,506 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 489 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 667 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-10-24 16:19:20,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2024-10-24 16:19:20,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 186. [2024-10-24 16:19:20,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 145 states have (on average 1.4758620689655173) internal successors, (214), 175 states have internal predecessors, (214), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-24 16:19:20,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 228 transitions. [2024-10-24 16:19:20,511 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 228 transitions. Word has length 33 [2024-10-24 16:19:20,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:20,511 INFO L471 AbstractCegarLoop]: Abstraction has 186 states and 228 transitions. [2024-10-24 16:19:20,511 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 4.222222222222222) internal successors, (76), 17 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:20,512 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 228 transitions. [2024-10-24 16:19:20,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-10-24 16:19:20,512 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:20,512 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:20,530 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:20,716 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-10-24 16:19:20,717 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:20,717 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:20,717 INFO L85 PathProgramCache]: Analyzing trace with hash -341299251, now seen corresponding path program 1 times [2024-10-24 16:19:20,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:20,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023033178] [2024-10-24 16:19:20,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:20,717 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:20,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:21,190 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:21,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:21,384 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:21,385 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:21,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023033178] [2024-10-24 16:19:21,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023033178] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:21,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859374576] [2024-10-24 16:19:21,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:21,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:21,385 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:21,387 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:21,388 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-10-24 16:19:21,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:21,560 INFO L255 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 53 conjuncts are in the unsatisfiable core [2024-10-24 16:19:21,563 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:21,565 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:21,594 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:19:21,595 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:19:21,622 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:19:21,629 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:19:21,659 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2024-10-24 16:19:21,671 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2024-10-24 16:19:21,897 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-10-24 16:19:21,902 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 35 [2024-10-24 16:19:22,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:22,153 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:22,242 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1485 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$#2.base| |c_ULTIMATE.start_main_~list~0#1.base| v_ArrVal_1485) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)) (= (select (select (store |c_#memory_$Pointer$#2.offset| |c_ULTIMATE.start_main_~list~0#1.base| (store (store (select |c_#memory_$Pointer$#2.offset| |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset| 0) (+ |c_ULTIMATE.start_main_~list~0#1.offset| 4) 0)) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)) is different from false [2024-10-24 16:19:22,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859374576] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:22,246 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:22,246 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2024-10-24 16:19:22,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098811708] [2024-10-24 16:19:22,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:22,246 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-10-24 16:19:22,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:22,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-10-24 16:19:22,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=478, Unknown=1, NotChecked=44, Total=600 [2024-10-24 16:19:22,247 INFO L87 Difference]: Start difference. First operand 186 states and 228 transitions. Second operand has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 20 states have internal predecessors, (55), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:23,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:23,518 INFO L93 Difference]: Finished difference Result 447 states and 563 transitions. [2024-10-24 16:19:23,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-10-24 16:19:23,519 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 20 states have internal predecessors, (55), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2024-10-24 16:19:23,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:23,521 INFO L225 Difference]: With dead ends: 447 [2024-10-24 16:19:23,521 INFO L226 Difference]: Without dead ends: 447 [2024-10-24 16:19:23,522 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=257, Invalid=1306, Unknown=1, NotChecked=76, Total=1640 [2024-10-24 16:19:23,522 INFO L432 NwaCegarLoop]: 63 mSDtfsCounter, 597 mSDsluCounter, 693 mSDsCounter, 0 mSdLazyCounter, 1173 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 598 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:23,523 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [598 Valid, 756 Invalid, 1213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1173 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-10-24 16:19:23,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2024-10-24 16:19:23,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 214. [2024-10-24 16:19:23,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 168 states have (on average 1.4107142857142858) internal successors, (237), 199 states have internal predecessors, (237), 8 states have call successors, (8), 7 states have call predecessors, (8), 9 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) [2024-10-24 16:19:23,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 260 transitions. [2024-10-24 16:19:23,531 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 260 transitions. Word has length 34 [2024-10-24 16:19:23,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:23,531 INFO L471 AbstractCegarLoop]: Abstraction has 214 states and 260 transitions. [2024-10-24 16:19:23,531 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 20 states have internal predecessors, (55), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-24 16:19:23,532 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 260 transitions. [2024-10-24 16:19:23,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2024-10-24 16:19:23,532 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:23,532 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:23,550 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:23,736 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-10-24 16:19:23,737 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:23,737 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:23,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1892159344, now seen corresponding path program 1 times [2024-10-24 16:19:23,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:23,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704015060] [2024-10-24 16:19:23,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:23,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:23,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:24,570 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:24,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:24,760 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:24,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:24,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704015060] [2024-10-24 16:19:24,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704015060] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:24,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760667061] [2024-10-24 16:19:24,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:24,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:24,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:24,762 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:24,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-10-24 16:19:24,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:24,924 INFO L255 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 48 conjuncts are in the unsatisfiable core [2024-10-24 16:19:24,926 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:24,931 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:24,943 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:19:24,943 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:19:24,958 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:19:24,963 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:19:25,111 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2024-10-24 16:19:25,193 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-10-24 16:19:25,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-10-24 16:19:25,394 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-24 16:19:25,395 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:25,547 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:19:25,548 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 21 [2024-10-24 16:19:25,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760667061] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:25,606 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:25,606 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2024-10-24 16:19:25,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325570948] [2024-10-24 16:19:25,608 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:25,609 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-10-24 16:19:25,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:25,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-10-24 16:19:25,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=564, Unknown=5, NotChecked=0, Total=650 [2024-10-24 16:19:25,610 INFO L87 Difference]: Start difference. First operand 214 states and 260 transitions. Second operand has 22 states, 22 states have (on average 2.5) internal successors, (55), 17 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-24 16:19:26,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:26,243 INFO L93 Difference]: Finished difference Result 227 states and 266 transitions. [2024-10-24 16:19:26,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-10-24 16:19:26,243 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 17 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2024-10-24 16:19:26,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:26,244 INFO L225 Difference]: With dead ends: 227 [2024-10-24 16:19:26,244 INFO L226 Difference]: Without dead ends: 227 [2024-10-24 16:19:26,245 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=172, Invalid=945, Unknown=5, NotChecked=0, Total=1122 [2024-10-24 16:19:26,245 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 234 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:26,245 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 467 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-10-24 16:19:26,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2024-10-24 16:19:26,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 194. [2024-10-24 16:19:26,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 150 states have (on average 1.4066666666666667) internal successors, (211), 181 states have internal predecessors, (211), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (12), 5 states have call predecessors, (12), 8 states have call successors, (12) [2024-10-24 16:19:26,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 231 transitions. [2024-10-24 16:19:26,254 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 231 transitions. Word has length 35 [2024-10-24 16:19:26,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:26,256 INFO L471 AbstractCegarLoop]: Abstraction has 194 states and 231 transitions. [2024-10-24 16:19:26,257 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 17 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-24 16:19:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 231 transitions. [2024-10-24 16:19:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-10-24 16:19:26,257 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:26,258 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:26,276 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-10-24 16:19:26,458 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:26,458 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:26,459 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:26,459 INFO L85 PathProgramCache]: Analyzing trace with hash -194855556, now seen corresponding path program 1 times [2024-10-24 16:19:26,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:26,459 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996159972] [2024-10-24 16:19:26,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:26,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:26,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:26,544 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:26,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:26,556 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:26,572 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-10-24 16:19:26,572 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:26,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996159972] [2024-10-24 16:19:26,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996159972] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:26,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335360133] [2024-10-24 16:19:26,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:26,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:26,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:26,574 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:26,576 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-10-24 16:19:26,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:26,783 INFO L255 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 3 conjuncts are in the unsatisfiable core [2024-10-24 16:19:26,784 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:26,797 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-10-24 16:19:26,797 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:26,815 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-10-24 16:19:26,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335360133] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:26,816 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:26,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2024-10-24 16:19:26,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430603072] [2024-10-24 16:19:26,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:26,816 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-10-24 16:19:26,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:26,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-10-24 16:19:26,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2024-10-24 16:19:26,817 INFO L87 Difference]: Start difference. First operand 194 states and 231 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-24 16:19:26,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:26,953 INFO L93 Difference]: Finished difference Result 240 states and 285 transitions. [2024-10-24 16:19:26,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-10-24 16:19:26,953 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 39 [2024-10-24 16:19:26,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:26,955 INFO L225 Difference]: With dead ends: 240 [2024-10-24 16:19:26,955 INFO L226 Difference]: Without dead ends: 240 [2024-10-24 16:19:26,955 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2024-10-24 16:19:26,955 INFO L432 NwaCegarLoop]: 69 mSDtfsCounter, 47 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:26,956 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 359 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 16:19:26,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2024-10-24 16:19:26,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 225. [2024-10-24 16:19:26,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 177 states have (on average 1.4293785310734464) internal successors, (253), 206 states have internal predecessors, (253), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (20), 11 states have call predecessors, (20), 12 states have call successors, (20) [2024-10-24 16:19:26,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 285 transitions. [2024-10-24 16:19:26,964 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 285 transitions. Word has length 39 [2024-10-24 16:19:26,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:26,965 INFO L471 AbstractCegarLoop]: Abstraction has 225 states and 285 transitions. [2024-10-24 16:19:26,965 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-24 16:19:26,965 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 285 transitions. [2024-10-24 16:19:26,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2024-10-24 16:19:26,967 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:26,967 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:26,988 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:27,168 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:27,168 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:27,169 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:27,169 INFO L85 PathProgramCache]: Analyzing trace with hash 2032656911, now seen corresponding path program 1 times [2024-10-24 16:19:27,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:27,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211767509] [2024-10-24 16:19:27,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:27,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:27,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:27,916 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:27,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:27,935 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:27,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:28,188 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 17 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:28,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:28,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211767509] [2024-10-24 16:19:28,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211767509] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:28,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078488663] [2024-10-24 16:19:28,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:28,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:28,189 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:28,191 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:28,192 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-10-24 16:19:28,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:28,410 INFO L255 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 47 conjuncts are in the unsatisfiable core [2024-10-24 16:19:28,413 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:28,423 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:28,431 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-10-24 16:19:28,514 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2024-10-24 16:19:28,520 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:28,619 INFO L349 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2024-10-24 16:19:28,619 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2024-10-24 16:19:28,623 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2024-10-24 16:19:28,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2024-10-24 16:19:28,722 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 19 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:28,722 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:29,054 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 28 [2024-10-24 16:19:29,068 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 70 [2024-10-24 16:19:29,071 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 94 [2024-10-24 16:19:29,312 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 19 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:29,312 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078488663] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:29,312 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:29,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 6] total 24 [2024-10-24 16:19:29,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358954897] [2024-10-24 16:19:29,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:29,313 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-24 16:19:29,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:29,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-24 16:19:29,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2024-10-24 16:19:29,315 INFO L87 Difference]: Start difference. First operand 225 states and 285 transitions. Second operand has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 23 states have internal predecessors, (101), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2024-10-24 16:19:30,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:30,263 INFO L93 Difference]: Finished difference Result 264 states and 324 transitions. [2024-10-24 16:19:30,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-10-24 16:19:30,265 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 23 states have internal predecessors, (101), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 49 [2024-10-24 16:19:30,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:30,266 INFO L225 Difference]: With dead ends: 264 [2024-10-24 16:19:30,266 INFO L226 Difference]: Without dead ends: 264 [2024-10-24 16:19:30,267 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=163, Invalid=959, Unknown=0, NotChecked=0, Total=1122 [2024-10-24 16:19:30,267 INFO L432 NwaCegarLoop]: 43 mSDtfsCounter, 191 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 546 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:30,267 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 546 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-10-24 16:19:30,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2024-10-24 16:19:30,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 232. [2024-10-24 16:19:30,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 185 states have (on average 1.4) internal successors, (259), 213 states have internal predecessors, (259), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2024-10-24 16:19:30,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 285 transitions. [2024-10-24 16:19:30,279 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 285 transitions. Word has length 49 [2024-10-24 16:19:30,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:30,280 INFO L471 AbstractCegarLoop]: Abstraction has 232 states and 285 transitions. [2024-10-24 16:19:30,280 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 23 states have internal predecessors, (101), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2024-10-24 16:19:30,280 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 285 transitions. [2024-10-24 16:19:30,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2024-10-24 16:19:30,281 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:30,281 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:30,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:30,481 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:30,482 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:30,483 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:30,483 INFO L85 PathProgramCache]: Analyzing trace with hash 2032656910, now seen corresponding path program 1 times [2024-10-24 16:19:30,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:30,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972115962] [2024-10-24 16:19:30,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:30,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:30,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:31,013 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:31,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:31,029 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:31,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:31,177 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 17 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:31,177 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:31,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972115962] [2024-10-24 16:19:31,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972115962] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:31,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990625276] [2024-10-24 16:19:31,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:31,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:31,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:31,180 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:31,182 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-10-24 16:19:31,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:31,427 INFO L255 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-10-24 16:19:31,429 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:31,435 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:31,485 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:31,541 INFO L349 Elim1Store]: treesize reduction 38, result has 36.7 percent of original size [2024-10-24 16:19:31,542 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 28 [2024-10-24 16:19:31,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2024-10-24 16:19:31,573 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 19 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:31,573 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:31,704 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 34 [2024-10-24 16:19:32,059 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 19 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 16:19:32,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990625276] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:32,060 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:32,060 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6, 6] total 21 [2024-10-24 16:19:32,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047233028] [2024-10-24 16:19:32,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:32,060 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-10-24 16:19:32,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:32,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-10-24 16:19:32,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2024-10-24 16:19:32,062 INFO L87 Difference]: Start difference. First operand 232 states and 285 transitions. Second operand has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 20 states have internal predecessors, (91), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2024-10-24 16:19:32,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:32,667 INFO L93 Difference]: Finished difference Result 259 states and 314 transitions. [2024-10-24 16:19:32,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-10-24 16:19:32,668 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 20 states have internal predecessors, (91), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 49 [2024-10-24 16:19:32,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:32,670 INFO L225 Difference]: With dead ends: 259 [2024-10-24 16:19:32,670 INFO L226 Difference]: Without dead ends: 259 [2024-10-24 16:19:32,671 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2024-10-24 16:19:32,671 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 282 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 929 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 929 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:32,671 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 570 Invalid, 940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 929 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-10-24 16:19:32,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2024-10-24 16:19:32,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 231. [2024-10-24 16:19:32,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 185 states have (on average 1.3891891891891892) internal successors, (257), 212 states have internal predecessors, (257), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2024-10-24 16:19:32,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 283 transitions. [2024-10-24 16:19:32,679 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 283 transitions. Word has length 49 [2024-10-24 16:19:32,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:32,679 INFO L471 AbstractCegarLoop]: Abstraction has 231 states and 283 transitions. [2024-10-24 16:19:32,679 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 20 states have internal predecessors, (91), 6 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2024-10-24 16:19:32,679 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 283 transitions. [2024-10-24 16:19:32,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2024-10-24 16:19:32,680 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:32,680 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:32,700 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-10-24 16:19:32,880 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-10-24 16:19:32,881 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:32,881 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:32,881 INFO L85 PathProgramCache]: Analyzing trace with hash 377900633, now seen corresponding path program 1 times [2024-10-24 16:19:32,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:32,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413020288] [2024-10-24 16:19:32,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:32,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:32,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:32,951 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:32,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:32,961 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2024-10-24 16:19:32,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:32,981 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:19:32,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:32,994 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-10-24 16:19:32,994 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:32,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413020288] [2024-10-24 16:19:32,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413020288] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:32,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670479545] [2024-10-24 16:19:32,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:32,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:32,995 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:32,997 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:32,998 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-10-24 16:19:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:33,274 INFO L255 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-10-24 16:19:33,275 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-10-24 16:19:33,284 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-10-24 16:19:33,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670479545] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 16:19:33,284 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-10-24 16:19:33,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2024-10-24 16:19:33,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135087923] [2024-10-24 16:19:33,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 16:19:33,285 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 16:19:33,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:33,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 16:19:33,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-10-24 16:19:33,286 INFO L87 Difference]: Start difference. First operand 231 states and 283 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:33,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:33,318 INFO L93 Difference]: Finished difference Result 225 states and 275 transitions. [2024-10-24 16:19:33,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 16:19:33,318 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 57 [2024-10-24 16:19:33,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:33,319 INFO L225 Difference]: With dead ends: 225 [2024-10-24 16:19:33,319 INFO L226 Difference]: Without dead ends: 225 [2024-10-24 16:19:33,320 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-10-24 16:19:33,320 INFO L432 NwaCegarLoop]: 68 mSDtfsCounter, 0 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:33,320 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 133 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-10-24 16:19:33,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2024-10-24 16:19:33,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 225. [2024-10-24 16:19:33,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 180 states have (on average 1.3833333333333333) internal successors, (249), 206 states have internal predecessors, (249), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2024-10-24 16:19:33,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 275 transitions. [2024-10-24 16:19:33,328 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 275 transitions. Word has length 57 [2024-10-24 16:19:33,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:33,328 INFO L471 AbstractCegarLoop]: Abstraction has 225 states and 275 transitions. [2024-10-24 16:19:33,328 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 16:19:33,328 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 275 transitions. [2024-10-24 16:19:33,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2024-10-24 16:19:33,329 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:33,329 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:33,348 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-10-24 16:19:33,533 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-10-24 16:19:33,534 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:33,534 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:33,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1385272671, now seen corresponding path program 1 times [2024-10-24 16:19:33,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:33,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35727187] [2024-10-24 16:19:33,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:33,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:33,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:33,877 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:33,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:33,891 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2024-10-24 16:19:33,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:33,905 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2024-10-24 16:19:33,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:34,002 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 23 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-10-24 16:19:34,003 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:34,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35727187] [2024-10-24 16:19:34,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35727187] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:34,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304007614] [2024-10-24 16:19:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:34,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:34,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:34,004 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:34,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-10-24 16:19:34,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:34,259 INFO L255 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-10-24 16:19:34,261 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:34,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:34,409 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-10-24 16:19:34,415 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:19:34,416 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:19:34,434 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 26 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-10-24 16:19:34,435 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:34,594 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 45 [2024-10-24 16:19:34,627 INFO L349 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2024-10-24 16:19:34,627 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 49 [2024-10-24 16:19:34,728 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:19:34,728 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 33 [2024-10-24 16:19:34,830 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:19:34,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 76 [2024-10-24 16:19:34,904 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 24 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-10-24 16:19:34,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304007614] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:34,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:34,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2024-10-24 16:19:34,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947044257] [2024-10-24 16:19:34,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:34,905 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-10-24 16:19:34,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:34,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-10-24 16:19:34,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2024-10-24 16:19:34,908 INFO L87 Difference]: Start difference. First operand 225 states and 275 transitions. Second operand has 24 states, 23 states have (on average 3.8260869565217392) internal successors, (88), 20 states have internal predecessors, (88), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2024-10-24 16:19:35,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:35,380 INFO L93 Difference]: Finished difference Result 243 states and 290 transitions. [2024-10-24 16:19:35,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-10-24 16:19:35,381 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.8260869565217392) internal successors, (88), 20 states have internal predecessors, (88), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 59 [2024-10-24 16:19:35,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:35,382 INFO L225 Difference]: With dead ends: 243 [2024-10-24 16:19:35,382 INFO L226 Difference]: Without dead ends: 243 [2024-10-24 16:19:35,383 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2024-10-24 16:19:35,383 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 294 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 717 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:35,383 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 454 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 717 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-10-24 16:19:35,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2024-10-24 16:19:35,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 222. [2024-10-24 16:19:35,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 178 states have (on average 1.3651685393258426) internal successors, (243), 203 states have internal predecessors, (243), 12 states have call successors, (12), 7 states have call predecessors, (12), 7 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2024-10-24 16:19:35,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 269 transitions. [2024-10-24 16:19:35,389 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 269 transitions. Word has length 59 [2024-10-24 16:19:35,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:35,389 INFO L471 AbstractCegarLoop]: Abstraction has 222 states and 269 transitions. [2024-10-24 16:19:35,389 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.8260869565217392) internal successors, (88), 20 states have internal predecessors, (88), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2024-10-24 16:19:35,389 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 269 transitions. [2024-10-24 16:19:35,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-10-24 16:19:35,390 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:35,390 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:35,409 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-10-24 16:19:35,590 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-10-24 16:19:35,591 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:35,591 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:35,591 INFO L85 PathProgramCache]: Analyzing trace with hash -162929823, now seen corresponding path program 1 times [2024-10-24 16:19:35,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:35,591 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145395352] [2024-10-24 16:19:35,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:35,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:35,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:36,061 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:36,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:36,145 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2024-10-24 16:19:36,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:36,230 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2024-10-24 16:19:36,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:36,355 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-10-24 16:19:36,356 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:36,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145395352] [2024-10-24 16:19:36,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145395352] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:36,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264586695] [2024-10-24 16:19:36,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:36,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:36,357 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:36,358 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:36,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-10-24 16:19:36,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:36,629 INFO L255 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-10-24 16:19:36,632 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:36,688 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:36,761 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2024-10-24 16:19:36,767 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2024-10-24 16:19:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 38 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-10-24 16:19:36,796 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:36,834 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2024-10-24 16:19:36,850 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 4 [2024-10-24 16:19:36,917 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 26 [2024-10-24 16:19:36,965 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 38 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-10-24 16:19:36,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264586695] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:36,965 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:36,965 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 20 [2024-10-24 16:19:36,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435365252] [2024-10-24 16:19:36,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:36,966 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-10-24 16:19:36,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:36,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-10-24 16:19:36,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2024-10-24 16:19:36,967 INFO L87 Difference]: Start difference. First operand 222 states and 269 transitions. Second operand has 20 states, 20 states have (on average 4.4) internal successors, (88), 17 states have internal predecessors, (88), 4 states have call successors, (6), 5 states have call predecessors, (6), 6 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2024-10-24 16:19:37,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:37,476 INFO L93 Difference]: Finished difference Result 234 states and 286 transitions. [2024-10-24 16:19:37,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-10-24 16:19:37,476 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.4) internal successors, (88), 17 states have internal predecessors, (88), 4 states have call successors, (6), 5 states have call predecessors, (6), 6 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 60 [2024-10-24 16:19:37,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:37,478 INFO L225 Difference]: With dead ends: 234 [2024-10-24 16:19:37,478 INFO L226 Difference]: Without dead ends: 234 [2024-10-24 16:19:37,478 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=236, Invalid=1024, Unknown=0, NotChecked=0, Total=1260 [2024-10-24 16:19:37,479 INFO L432 NwaCegarLoop]: 56 mSDtfsCounter, 60 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:37,479 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 595 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-10-24 16:19:37,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2024-10-24 16:19:37,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 214. [2024-10-24 16:19:37,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 171 states have (on average 1.368421052631579) internal successors, (234), 195 states have internal predecessors, (234), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2024-10-24 16:19:37,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 258 transitions. [2024-10-24 16:19:37,490 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 258 transitions. Word has length 60 [2024-10-24 16:19:37,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:37,490 INFO L471 AbstractCegarLoop]: Abstraction has 214 states and 258 transitions. [2024-10-24 16:19:37,490 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.4) internal successors, (88), 17 states have internal predecessors, (88), 4 states have call successors, (6), 5 states have call predecessors, (6), 6 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2024-10-24 16:19:37,490 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 258 transitions. [2024-10-24 16:19:37,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-10-24 16:19:37,491 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:37,491 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:37,510 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-10-24 16:19:37,691 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2024-10-24 16:19:37,692 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:37,692 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:37,692 INFO L85 PathProgramCache]: Analyzing trace with hash -1843828506, now seen corresponding path program 2 times [2024-10-24 16:19:37,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:37,693 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108101627] [2024-10-24 16:19:37,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:37,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:37,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:38,355 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:38,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:38,476 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2024-10-24 16:19:38,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:38,554 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2024-10-24 16:19:38,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:38,639 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2024-10-24 16:19:38,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:38,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108101627] [2024-10-24 16:19:38,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108101627] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:38,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615039092] [2024-10-24 16:19:38,640 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-24 16:19:38,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:38,641 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:38,642 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:38,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-10-24 16:19:38,990 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-24 16:19:38,990 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-24 16:19:38,993 INFO L255 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 91 conjuncts are in the unsatisfiable core [2024-10-24 16:19:38,996 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:39,011 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-10-24 16:19:39,017 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:39,129 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:39,172 INFO L349 Elim1Store]: treesize reduction 26, result has 35.0 percent of original size [2024-10-24 16:19:39,172 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 29 [2024-10-24 16:19:39,186 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 9 [2024-10-24 16:19:39,476 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2024-10-24 16:19:39,476 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 17 [2024-10-24 16:19:39,504 INFO L349 Elim1Store]: treesize reduction 64, result has 35.4 percent of original size [2024-10-24 16:19:39,504 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 53 [2024-10-24 16:19:39,508 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 18 [2024-10-24 16:19:39,769 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (store |c_old(#length)| append_~node~0.base (select |c_#length| append_~node~0.base)) |c_#length|) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2024-10-24 16:19:39,790 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 14 [2024-10-24 16:19:39,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:39,795 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2024-10-24 16:19:39,812 INFO L349 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2024-10-24 16:19:39,812 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2024-10-24 16:19:39,880 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2024-10-24 16:19:39,880 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2024-10-24 16:19:39,928 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 6 not checked. [2024-10-24 16:19:39,928 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:40,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615039092] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:40,225 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:40,225 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 27 [2024-10-24 16:19:40,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346651342] [2024-10-24 16:19:40,226 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:40,226 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-10-24 16:19:40,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:40,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-10-24 16:19:40,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=807, Unknown=1, NotChecked=58, Total=992 [2024-10-24 16:19:40,227 INFO L87 Difference]: Start difference. First operand 214 states and 258 transitions. Second operand has 28 states, 27 states have (on average 3.814814814814815) internal successors, (103), 23 states have internal predecessors, (103), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-24 16:19:40,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:40,986 INFO L93 Difference]: Finished difference Result 233 states and 281 transitions. [2024-10-24 16:19:40,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-10-24 16:19:40,987 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.814814814814815) internal successors, (103), 23 states have internal predecessors, (103), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 61 [2024-10-24 16:19:40,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:40,988 INFO L225 Difference]: With dead ends: 233 [2024-10-24 16:19:40,988 INFO L226 Difference]: Without dead ends: 233 [2024-10-24 16:19:40,988 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=270, Invalid=1625, Unknown=1, NotChecked=84, Total=1980 [2024-10-24 16:19:40,989 INFO L432 NwaCegarLoop]: 51 mSDtfsCounter, 208 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 801 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 801 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:40,989 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 453 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 801 Invalid, 0 Unknown, 133 Unchecked, 0.4s Time] [2024-10-24 16:19:40,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2024-10-24 16:19:40,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 143. [2024-10-24 16:19:40,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 111 states have (on average 1.3873873873873874) internal successors, (154), 133 states have internal predecessors, (154), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-24 16:19:40,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 166 transitions. [2024-10-24 16:19:40,993 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 166 transitions. Word has length 61 [2024-10-24 16:19:40,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:40,993 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 166 transitions. [2024-10-24 16:19:40,994 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.814814814814815) internal successors, (103), 23 states have internal predecessors, (103), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-24 16:19:40,994 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 166 transitions. [2024-10-24 16:19:40,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2024-10-24 16:19:40,994 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:40,994 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:41,014 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-10-24 16:19:41,195 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:41,195 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:41,195 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:41,196 INFO L85 PathProgramCache]: Analyzing trace with hash -683427782, now seen corresponding path program 2 times [2024-10-24 16:19:41,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:41,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596077019] [2024-10-24 16:19:41,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:41,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:41,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,576 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:41,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,586 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,667 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:19:41,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,793 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2024-10-24 16:19:41,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,804 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2024-10-24 16:19:41,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:41,816 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2024-10-24 16:19:41,816 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:41,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596077019] [2024-10-24 16:19:41,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596077019] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:41,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686897370] [2024-10-24 16:19:41,817 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-24 16:19:41,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:41,817 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:41,819 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:41,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-10-24 16:19:42,472 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-24 16:19:42,473 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-24 16:19:42,476 INFO L255 TraceCheckSpWp]: Trace formula consists of 808 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-10-24 16:19:42,477 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:42,536 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-10-24 16:19:42,536 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:42,612 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2024-10-24 16:19:42,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686897370] provided 0 perfect and 2 imperfect interpolant sequences [2024-10-24 16:19:42,612 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-10-24 16:19:42,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 17 [2024-10-24 16:19:42,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671016414] [2024-10-24 16:19:42,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:42,613 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-10-24 16:19:42,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:42,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-10-24 16:19:42,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2024-10-24 16:19:42,614 INFO L87 Difference]: Start difference. First operand 143 states and 166 transitions. Second operand has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 states have internal predecessors, (60), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2024-10-24 16:19:43,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:43,045 INFO L93 Difference]: Finished difference Result 165 states and 172 transitions. [2024-10-24 16:19:43,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-10-24 16:19:43,046 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 states have internal predecessors, (60), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 84 [2024-10-24 16:19:43,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:43,047 INFO L225 Difference]: With dead ends: 165 [2024-10-24 16:19:43,047 INFO L226 Difference]: Without dead ends: 165 [2024-10-24 16:19:43,047 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 174 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2024-10-24 16:19:43,047 INFO L432 NwaCegarLoop]: 49 mSDtfsCounter, 192 mSDsluCounter, 454 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:43,048 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 503 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 539 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-10-24 16:19:43,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2024-10-24 16:19:43,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 145. [2024-10-24 16:19:43,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 112 states have (on average 1.4107142857142858) internal successors, (158), 134 states have internal predecessors, (158), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-24 16:19:43,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 172 transitions. [2024-10-24 16:19:43,052 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 172 transitions. Word has length 84 [2024-10-24 16:19:43,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:43,052 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 172 transitions. [2024-10-24 16:19:43,052 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 states have internal predecessors, (60), 7 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2024-10-24 16:19:43,052 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 172 transitions. [2024-10-24 16:19:43,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-10-24 16:19:43,053 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:43,053 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:43,073 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-10-24 16:19:43,254 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-10-24 16:19:43,255 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:43,256 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:43,256 INFO L85 PathProgramCache]: Analyzing trace with hash 241281176, now seen corresponding path program 1 times [2024-10-24 16:19:43,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:43,256 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96850701] [2024-10-24 16:19:43,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:43,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:43,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:43,993 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:44,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,045 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:44,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,113 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:19:44,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,159 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2024-10-24 16:19:44,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,204 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2024-10-24 16:19:44,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,249 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2024-10-24 16:19:44,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,299 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2024-10-24 16:19:44,299 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:44,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96850701] [2024-10-24 16:19:44,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96850701] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:44,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093589603] [2024-10-24 16:19:44,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:44,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:44,300 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:44,301 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:44,304 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-10-24 16:19:44,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:44,749 INFO L255 TraceCheckSpWp]: Trace formula consists of 991 conjuncts, 80 conjuncts are in the unsatisfiable core [2024-10-24 16:19:44,753 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:44,834 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:44,868 INFO L349 Elim1Store]: treesize reduction 30, result has 34.8 percent of original size [2024-10-24 16:19:44,869 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 33 [2024-10-24 16:19:45,039 INFO L349 Elim1Store]: treesize reduction 78, result has 35.5 percent of original size [2024-10-24 16:19:45,040 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 40 treesize of output 63 [2024-10-24 16:19:45,045 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 20 [2024-10-24 16:19:45,212 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base (select |c_#valid| append_~node~0.base))))) is different from true [2024-10-24 16:19:45,231 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 14 [2024-10-24 16:19:45,268 INFO L349 Elim1Store]: treesize reduction 60, result has 31.8 percent of original size [2024-10-24 16:19:45,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 29 treesize of output 40 [2024-10-24 16:19:45,336 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1))) is different from true [2024-10-24 16:19:45,370 INFO L349 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2024-10-24 16:19:45,370 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 30 [2024-10-24 16:19:45,485 INFO L349 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2024-10-24 16:19:45,486 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 22 treesize of output 30 [2024-10-24 16:19:45,524 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 31 proven. 47 refuted. 0 times theorem prover too weak. 23 trivial. 80 not checked. [2024-10-24 16:19:45,524 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:45,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093589603] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:45,746 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:45,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16] total 20 [2024-10-24 16:19:45,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282515300] [2024-10-24 16:19:45,747 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:45,747 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-10-24 16:19:45,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:45,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-10-24 16:19:45,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=342, Unknown=2, NotChecked=78, Total=506 [2024-10-24 16:19:45,748 INFO L87 Difference]: Start difference. First operand 145 states and 172 transitions. Second operand has 21 states, 20 states have (on average 5.25) internal successors, (105), 18 states have internal predecessors, (105), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-24 16:19:46,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:46,136 INFO L93 Difference]: Finished difference Result 166 states and 193 transitions. [2024-10-24 16:19:46,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-10-24 16:19:46,137 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 5.25) internal successors, (105), 18 states have internal predecessors, (105), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 103 [2024-10-24 16:19:46,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:46,138 INFO L225 Difference]: With dead ends: 166 [2024-10-24 16:19:46,138 INFO L226 Difference]: Without dead ends: 166 [2024-10-24 16:19:46,138 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 137 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 2 IntricatePredicates, 1 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=149, Invalid=613, Unknown=2, NotChecked=106, Total=870 [2024-10-24 16:19:46,138 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 56 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:46,139 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 358 Invalid, 672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 458 Invalid, 0 Unknown, 207 Unchecked, 0.3s Time] [2024-10-24 16:19:46,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2024-10-24 16:19:46,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 144. [2024-10-24 16:19:46,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 112 states have (on average 1.4017857142857142) internal successors, (157), 133 states have internal predecessors, (157), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-24 16:19:46,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 171 transitions. [2024-10-24 16:19:46,142 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 171 transitions. Word has length 103 [2024-10-24 16:19:46,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:46,143 INFO L471 AbstractCegarLoop]: Abstraction has 144 states and 171 transitions. [2024-10-24 16:19:46,143 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 5.25) internal successors, (105), 18 states have internal predecessors, (105), 5 states have call successors, (7), 4 states have call predecessors, (7), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-24 16:19:46,143 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 171 transitions. [2024-10-24 16:19:46,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-10-24 16:19:46,143 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:46,144 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:46,164 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-10-24 16:19:46,344 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-10-24 16:19:46,344 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:46,345 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:46,345 INFO L85 PathProgramCache]: Analyzing trace with hash 241281177, now seen corresponding path program 1 times [2024-10-24 16:19:46,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:46,345 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404254378] [2024-10-24 16:19:46,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:46,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:46,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,119 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:19:47,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,183 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:19:47,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,264 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:19:47,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,350 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2024-10-24 16:19:47,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,424 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2024-10-24 16:19:47,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,507 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2024-10-24 16:19:47,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:47,594 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2024-10-24 16:19:47,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:19:47,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404254378] [2024-10-24 16:19:47,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404254378] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:47,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403479366] [2024-10-24 16:19:47,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:47,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:19:47,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:19:47,597 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:19:47,599 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-10-24 16:19:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:19:48,041 INFO L255 TraceCheckSpWp]: Trace formula consists of 991 conjuncts, 120 conjuncts are in the unsatisfiable core [2024-10-24 16:19:48,045 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:19:48,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:48,261 INFO L349 Elim1Store]: treesize reduction 30, result has 34.8 percent of original size [2024-10-24 16:19:48,261 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 29 treesize of output 33 [2024-10-24 16:19:48,269 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 9 [2024-10-24 16:19:48,581 INFO L349 Elim1Store]: treesize reduction 78, result has 35.5 percent of original size [2024-10-24 16:19:48,581 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 40 treesize of output 63 [2024-10-24 16:19:48,589 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 20 [2024-10-24 16:19:48,603 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 9 [2024-10-24 16:19:48,808 WARN L873 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (store |c_old(#length)| append_~node~0.base (select |c_#length| append_~node~0.base)) |c_#length|) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2024-10-24 16:19:48,824 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 14 [2024-10-24 16:19:48,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:48,828 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2024-10-24 16:19:48,842 INFO L349 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2024-10-24 16:19:48,843 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2024-10-24 16:19:48,868 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:19:48,970 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-10-24 16:19:49,029 INFO L349 Elim1Store]: treesize reduction 25, result has 37.5 percent of original size [2024-10-24 16:19:49,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 19 [2024-10-24 16:19:49,335 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2024-10-24 16:19:49,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:19:49,349 INFO L349 Elim1Store]: treesize reduction 21, result has 30.0 percent of original size [2024-10-24 16:19:49,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 21 [2024-10-24 16:19:49,356 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:19:49,356 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:19:49,410 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 117 refuted. 0 times theorem prover too weak. 3 trivial. 16 not checked. [2024-10-24 16:19:49,410 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:19:49,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403479366] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:19:49,558 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:19:49,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 37 [2024-10-24 16:19:49,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954074990] [2024-10-24 16:19:49,558 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:19:49,558 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-10-24 16:19:49,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:19:49,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-10-24 16:19:49,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1302, Unknown=1, NotChecked=74, Total=1560 [2024-10-24 16:19:49,560 INFO L87 Difference]: Start difference. First operand 144 states and 171 transitions. Second operand has 38 states, 37 states have (on average 4.054054054054054) internal successors, (150), 33 states have internal predecessors, (150), 7 states have call successors, (10), 5 states have call predecessors, (10), 10 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2024-10-24 16:19:53,579 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 16:19:57,619 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 16:19:58,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:19:58,480 INFO L93 Difference]: Finished difference Result 165 states and 192 transitions. [2024-10-24 16:19:58,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-10-24 16:19:58,481 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 4.054054054054054) internal successors, (150), 33 states have internal predecessors, (150), 7 states have call successors, (10), 5 states have call predecessors, (10), 10 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) Word has length 103 [2024-10-24 16:19:58,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:19:58,482 INFO L225 Difference]: With dead ends: 165 [2024-10-24 16:19:58,482 INFO L226 Difference]: Without dead ends: 165 [2024-10-24 16:19:58,483 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 844 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=389, Invalid=2266, Unknown=1, NotChecked=100, Total=2756 [2024-10-24 16:19:58,483 INFO L432 NwaCegarLoop]: 42 mSDtfsCounter, 264 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 15 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2024-10-24 16:19:58,483 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 390 Invalid, 755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 620 Invalid, 2 Unknown, 118 Unchecked, 8.4s Time] [2024-10-24 16:19:58,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2024-10-24 16:19:58,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 143. [2024-10-24 16:19:58,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 112 states have (on average 1.3928571428571428) internal successors, (156), 132 states have internal predecessors, (156), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-24 16:19:58,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2024-10-24 16:19:58,487 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 103 [2024-10-24 16:19:58,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:19:58,487 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2024-10-24 16:19:58,488 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 4.054054054054054) internal successors, (150), 33 states have internal predecessors, (150), 7 states have call successors, (10), 5 states have call predecessors, (10), 10 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2024-10-24 16:19:58,488 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2024-10-24 16:19:58,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-10-24 16:19:58,489 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:19:58,489 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:19:58,512 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2024-10-24 16:19:58,689 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-10-24 16:19:58,690 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:19:58,690 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:19:58,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1110213742, now seen corresponding path program 1 times [2024-10-24 16:19:58,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:19:58,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438388609] [2024-10-24 16:19:58,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:19:58,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:19:58,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,066 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:20:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,171 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:20:00,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,323 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:20:00,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,411 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2024-10-24 16:20:00,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,477 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2024-10-24 16:20:00,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,539 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2024-10-24 16:20:00,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:00,612 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2024-10-24 16:20:00,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:20:00,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438388609] [2024-10-24 16:20:00,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438388609] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:20:00,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454086422] [2024-10-24 16:20:00,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:20:00,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:20:00,613 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:20:00,615 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:20:00,616 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-10-24 16:20:01,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:01,083 INFO L255 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 114 conjuncts are in the unsatisfiable core [2024-10-24 16:20:01,087 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:20:01,090 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:20:01,096 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:20:01,096 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:20:01,103 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:20:01,128 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:20:01,134 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 22 [2024-10-24 16:20:01,309 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 20 [2024-10-24 16:20:01,356 INFO L349 Elim1Store]: treesize reduction 42, result has 36.4 percent of original size [2024-10-24 16:20:01,356 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 41 [2024-10-24 16:20:01,362 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 34 [2024-10-24 16:20:01,646 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:20:01,647 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 39 [2024-10-24 16:20:01,653 INFO L173 IndexEqualityManager]: detected equality via solver [2024-10-24 16:20:01,664 INFO L349 Elim1Store]: treesize reduction 54, result has 14.3 percent of original size [2024-10-24 16:20:01,665 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 27 [2024-10-24 16:20:02,040 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 46 [2024-10-24 16:20:02,086 INFO L349 Elim1Store]: treesize reduction 121, result has 22.4 percent of original size [2024-10-24 16:20:02,086 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 37 treesize of output 47 [2024-10-24 16:20:02,096 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2024-10-24 16:20:02,325 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 28 [2024-10-24 16:20:02,357 INFO L349 Elim1Store]: treesize reduction 92, result has 28.1 percent of original size [2024-10-24 16:20:02,358 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 33 treesize of output 48 [2024-10-24 16:20:02,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 28 [2024-10-24 16:20:02,531 INFO L349 Elim1Store]: treesize reduction 74, result has 21.3 percent of original size [2024-10-24 16:20:02,531 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 26 treesize of output 34 [2024-10-24 16:20:02,597 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:20:02,597 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 16 [2024-10-24 16:20:02,631 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 23 proven. 145 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-10-24 16:20:02,631 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:20:06,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454086422] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:20:06,723 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:20:06,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 28] total 39 [2024-10-24 16:20:06,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317929516] [2024-10-24 16:20:06,723 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:20:06,724 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2024-10-24 16:20:06,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:20:06,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2024-10-24 16:20:06,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1441, Unknown=15, NotChecked=0, Total=1640 [2024-10-24 16:20:06,725 INFO L87 Difference]: Start difference. First operand 143 states and 170 transitions. Second operand has 40 states, 39 states have (on average 3.230769230769231) internal successors, (126), 38 states have internal predecessors, (126), 6 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2024-10-24 16:20:07,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 16:20:07,983 INFO L93 Difference]: Finished difference Result 222 states and 253 transitions. [2024-10-24 16:20:07,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-10-24 16:20:07,984 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 3.230769230769231) internal successors, (126), 38 states have internal predecessors, (126), 6 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) Word has length 104 [2024-10-24 16:20:07,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 16:20:07,985 INFO L225 Difference]: With dead ends: 222 [2024-10-24 16:20:07,985 INFO L226 Difference]: Without dead ends: 222 [2024-10-24 16:20:07,986 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1148 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=516, Invalid=3628, Unknown=16, NotChecked=0, Total=4160 [2024-10-24 16:20:07,986 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 336 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 1002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-10-24 16:20:07,987 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 421 Invalid, 1002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-10-24 16:20:07,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2024-10-24 16:20:07,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 165. [2024-10-24 16:20:07,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 132 states have (on average 1.3181818181818181) internal successors, (174), 148 states have internal predecessors, (174), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2024-10-24 16:20:07,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 198 transitions. [2024-10-24 16:20:07,991 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 198 transitions. Word has length 104 [2024-10-24 16:20:07,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 16:20:07,992 INFO L471 AbstractCegarLoop]: Abstraction has 165 states and 198 transitions. [2024-10-24 16:20:07,992 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 3.230769230769231) internal successors, (126), 38 states have internal predecessors, (126), 6 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2024-10-24 16:20:07,992 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 198 transitions. [2024-10-24 16:20:07,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-10-24 16:20:07,993 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 16:20:07,993 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 16:20:08,014 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2024-10-24 16:20:08,194 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-10-24 16:20:08,194 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2024-10-24 16:20:08,194 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 16:20:08,194 INFO L85 PathProgramCache]: Analyzing trace with hash -1110213741, now seen corresponding path program 1 times [2024-10-24 16:20:08,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 16:20:08,195 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737583746] [2024-10-24 16:20:08,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:20:08,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 16:20:08,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:09,579 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2024-10-24 16:20:09,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:09,752 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-24 16:20:09,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:10,063 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2024-10-24 16:20:10,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:10,207 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2024-10-24 16:20:10,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:10,307 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2024-10-24 16:20:10,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:10,455 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2024-10-24 16:20:10,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:10,610 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 137 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2024-10-24 16:20:10,610 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 16:20:10,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737583746] [2024-10-24 16:20:10,610 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737583746] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:20:10,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584486181] [2024-10-24 16:20:10,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 16:20:10,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 16:20:10,611 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 16:20:10,612 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 16:20:10,613 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-10-24 16:20:11,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 16:20:11,110 INFO L255 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 163 conjuncts are in the unsatisfiable core [2024-10-24 16:20:11,116 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 16:20:11,119 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:20:11,126 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2024-10-24 16:20:11,126 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2024-10-24 16:20:11,137 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2024-10-24 16:20:11,141 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2024-10-24 16:20:11,207 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:20:11,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 16:20:11,249 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 27 [2024-10-24 16:20:11,256 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2024-10-24 16:20:11,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 20 [2024-10-24 16:20:11,644 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 18 [2024-10-24 16:20:11,663 INFO L349 Elim1Store]: treesize reduction 42, result has 36.4 percent of original size [2024-10-24 16:20:11,663 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 41 [2024-10-24 16:20:11,668 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2024-10-24 16:20:11,676 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 13 [2024-10-24 16:20:11,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-10-24 16:20:11,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 13 [2024-10-24 16:20:12,022 INFO L349 Elim1Store]: treesize reduction 90, result has 36.2 percent of original size [2024-10-24 16:20:12,023 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 44 treesize of output 71 [2024-10-24 16:20:12,029 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:20:12,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 106 treesize of output 59 [2024-10-24 16:20:12,052 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 18 [2024-10-24 16:20:12,477 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 18 [2024-10-24 16:20:12,490 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 62 [2024-10-24 16:20:12,498 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2024-10-24 16:20:12,522 INFO L349 Elim1Store]: treesize reduction 12, result has 58.6 percent of original size [2024-10-24 16:20:12,522 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 29 [2024-10-24 16:20:12,528 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2024-10-24 16:20:12,883 INFO L349 Elim1Store]: treesize reduction 40, result has 49.4 percent of original size [2024-10-24 16:20:12,883 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 56 [2024-10-24 16:20:12,889 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 16:20:12,889 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 39 [2024-10-24 16:20:12,915 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 23 [2024-10-24 16:20:13,359 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 71 [2024-10-24 16:20:13,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 42 [2024-10-24 16:20:13,437 INFO L349 Elim1Store]: treesize reduction 44, result has 60.7 percent of original size [2024-10-24 16:20:13,438 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 46 treesize of output 95 [2024-10-24 16:20:13,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 36 [2024-10-24 16:20:13,453 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-24 16:20:13,961 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 191 treesize of output 137 [2024-10-24 16:20:14,129 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 17 proven. 156 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-10-24 16:20:14,129 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 16:20:14,313 WARN L851 $PredicateComparison]: unable to prove that (let ((.cse3 (+ |c_ULTIMATE.start_main_~list2~0#1.offset| 4))) (let ((.cse1 (select (select |c_#memory_$Pointer$#2.base| |c_ULTIMATE.start_main_~list2~0#1.base|) .cse3)) (.cse2 (+ 9 (select (select |c_#memory_$Pointer$#2.offset| |c_ULTIMATE.start_main_~list2~0#1.base|) .cse3)))) (and (forall ((v_ArrVal_7140 Int)) (or (forall ((v_append_~node~0.base_152 Int)) (let ((.cse0 (store |c_#length| v_append_~node~0.base_152 v_ArrVal_7140))) (or (forall ((v_ArrVal_7138 (Array Int Int)) (v_ArrVal_7139 (Array Int Int))) (<= (+ 9 (select (select (store |c_#memory_$Pointer$#2.offset| |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_7139) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|)) (select .cse0 (select (select (store |c_#memory_$Pointer$#2.base| |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_7138) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|)))) (< (select .cse0 .cse1) .cse2)))) (< v_ArrVal_7140 9))) (or (forall ((v_ArrVal_7139 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$#2.offset| |c_ULTIMATE.start_main_~list2~0#1.base| v_ArrVal_7139) |c_ULTIMATE.start_main_~list~0#1.base|) |c_ULTIMATE.start_main_~list~0#1.offset|)))) (forall ((v_ArrVal_7140 Int) (v_append_~node~0.base_152 Int)) (or (< (select (store |c_#length| v_append_~node~0.base_152 v_ArrVal_7140) .cse1) .cse2) (< v_ArrVal_7140 9))))))) is different from false [2024-10-24 16:20:14,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584486181] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 16:20:14,315 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 16:20:14,315 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 29] total 48 [2024-10-24 16:20:14,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958061966] [2024-10-24 16:20:14,315 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 16:20:14,316 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2024-10-24 16:20:14,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 16:20:14,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2024-10-24 16:20:14,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2329, Unknown=1, NotChecked=98, Total=2652 [2024-10-24 16:20:14,317 INFO L87 Difference]: Start difference. First operand 165 states and 198 transitions. Second operand has 49 states, 48 states have (on average 3.2916666666666665) internal successors, (158), 46 states have internal predecessors, (158), 9 states have call successors, (10), 4 states have call predecessors, (10), 10 states have return successors, (12), 10 states have call predecessors, (12), 9 states have call successors, (12)