/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt6.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-17 15:41:18,130 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-17 15:41:18,132 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-17 15:41:18,199 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-17 15:41:18,226 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-17 15:41:18,227 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-17 15:41:18,227 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-17 15:41:18,228 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-03-17 15:41:18,233 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-17 15:41:18,234 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-17 15:41:18,234 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-17 15:41:18,235 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-17 15:41:18,236 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-17 15:41:18,236 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 15:41:18,237 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-17 15:41:18,237 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-17 15:41:18,237 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-03-17 15:41:18,237 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-17 15:41:18,424 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-17 15:41:18,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-17 15:41:18,445 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-17 15:41:18,446 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-17 15:41:18,446 INFO L275 PluginConnector]: CDTParser initialized [2022-03-17 15:41:18,447 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt6.c [2022-03-17 15:41:18,497 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919f9fcc5/85fcecb261d144a5b8a3e82b351b8a1c/FLAG8c836e621 [2022-03-17 15:41:18,895 INFO L306 CDTParser]: Found 1 translation units. [2022-03-17 15:41:18,895 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt6.c [2022-03-17 15:41:18,901 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919f9fcc5/85fcecb261d144a5b8a3e82b351b8a1c/FLAG8c836e621 [2022-03-17 15:41:18,912 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919f9fcc5/85fcecb261d144a5b8a3e82b351b8a1c [2022-03-17 15:41:18,914 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-17 15:41:18,916 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-03-17 15:41:18,918 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-17 15:41:18,918 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-17 15:41:18,920 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-17 15:41:18,921 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 03:41:18" (1/1) ... [2022-03-17 15:41:18,922 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fc3e3b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:18, skipping insertion in model container [2022-03-17 15:41:18,922 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 03:41:18" (1/1) ... [2022-03-17 15:41:18,926 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-17 15:41:18,936 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-17 15:41:19,100 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt6.c[403,416] [2022-03-17 15:41:19,120 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 15:41:19,127 INFO L203 MainTranslator]: Completed pre-run [2022-03-17 15:41:19,136 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt6.c[403,416] [2022-03-17 15:41:19,147 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 15:41:19,156 INFO L208 MainTranslator]: Completed translation [2022-03-17 15:41:19,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19 WrapperNode [2022-03-17 15:41:19,157 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-17 15:41:19,158 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-17 15:41:19,158 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-17 15:41:19,158 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-17 15:41:19,165 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,172 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,172 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,184 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,188 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,194 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,195 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-17 15:41:19,196 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-17 15:41:19,196 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-17 15:41:19,196 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-17 15:41:19,197 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (1/1) ... [2022-03-17 15:41:19,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 15:41:19,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:41:19,218 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-17 15:41:19,243 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-17 15:41:19,252 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-17 15:41:19,252 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-17 15:41:19,253 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-17 15:41:19,253 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-17 15:41:19,253 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-17 15:41:19,253 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-17 15:41:19,253 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-17 15:41:19,253 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-17 15:41:19,254 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-17 15:41:19,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-17 15:41:19,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-17 15:41:19,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-17 15:41:19,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-17 15:41:19,259 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-17 15:41:19,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-17 15:41:19,310 INFO L234 CfgBuilder]: Building ICFG [2022-03-17 15:41:19,311 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-17 15:41:25,948 INFO L275 CfgBuilder]: Performing block encoding [2022-03-17 15:41:25,952 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-17 15:41:25,952 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-17 15:41:25,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 03:41:25 BoogieIcfgContainer [2022-03-17 15:41:25,953 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-17 15:41:25,954 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-03-17 15:41:25,954 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-03-17 15:41:25,955 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-03-17 15:41:25,967 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 03:41:25" (1/1) ... [2022-03-17 15:41:25,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 03:41:25 BasicIcfg [2022-03-17 15:41:25,981 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-03-17 15:41:25,982 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-17 15:41:25,982 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-17 15:41:25,986 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-17 15:41:25,987 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 03:41:18" (1/4) ... [2022-03-17 15:41:25,987 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725c9478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 03:41:25, skipping insertion in model container [2022-03-17 15:41:25,987 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 03:41:19" (2/4) ... [2022-03-17 15:41:25,987 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725c9478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 03:41:25, skipping insertion in model container [2022-03-17 15:41:25,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 03:41:25" (3/4) ... [2022-03-17 15:41:25,988 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725c9478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.03 03:41:25, skipping insertion in model container [2022-03-17 15:41:25,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 03:41:25" (4/4) ... [2022-03-17 15:41:25,989 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt6.cJordan [2022-03-17 15:41:25,992 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-03-17 15:41:25,992 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-17 15:41:26,022 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-17 15:41:26,027 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2022-03-17 15:41:26,027 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-17 15:41:26,036 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-17 15:41:26,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-17 15:41:26,041 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:41:26,041 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:41:26,041 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:41:26,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:41:26,045 INFO L85 PathProgramCache]: Analyzing trace with hash 2096714442, now seen corresponding path program 1 times [2022-03-17 15:41:26,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:41:26,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889969395] [2022-03-17 15:41:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:26,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:41:26,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:26,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:41:26,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:26,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:26,210 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:41:26,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889969395] [2022-03-17 15:41:26,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889969395] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 15:41:26,211 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 15:41:26,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-17 15:41:26,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667623047] [2022-03-17 15:41:26,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:41:26,216 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-17 15:41:26,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:41:26,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-17 15:41:26,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-17 15:41:26,234 INFO L87 Difference]: Start difference. First operand has 26 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:26,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:41:26,263 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-03-17 15:41:26,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-17 15:41:26,266 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-17 15:41:26,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:41:26,270 INFO L225 Difference]: With dead ends: 26 [2022-03-17 15:41:26,271 INFO L226 Difference]: Without dead ends: 19 [2022-03-17 15:41:26,272 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-17 15:41:26,274 INFO L912 BasicCegarLoop]: 29 mSDtfsCounter, 23 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-17 15:41:26,275 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 32 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 15:41:26,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-17 15:41:26,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-17 15:41:26,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:26,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2022-03-17 15:41:26,294 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 12 [2022-03-17 15:41:26,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:41:26,295 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2022-03-17 15:41:26,295 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:26,295 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2022-03-17 15:41:26,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-17 15:41:26,295 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:41:26,295 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:41:26,296 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-17 15:41:26,296 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:41:26,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:41:26,296 INFO L85 PathProgramCache]: Analyzing trace with hash 2097637963, now seen corresponding path program 1 times [2022-03-17 15:41:26,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:41:26,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089314705] [2022-03-17 15:41:26,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:26,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:41:26,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:26,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:41:26,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:26,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:26,562 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:41:26,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089314705] [2022-03-17 15:41:26,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089314705] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 15:41:26,562 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 15:41:26,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-17 15:41:26,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900149923] [2022-03-17 15:41:26,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:41:26,563 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:41:26,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:41:26,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:41:26,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-17 15:41:26,569 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:28,631 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:30,817 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:33,002 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:35,163 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:37,304 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:37,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:41:37,486 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2022-03-17 15:41:37,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:41:37,487 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-17 15:41:37,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:41:37,487 INFO L225 Difference]: With dead ends: 24 [2022-03-17 15:41:37,487 INFO L226 Difference]: Without dead ends: 21 [2022-03-17 15:41:37,488 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-17 15:41:37,489 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 20 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2022-03-17 15:41:37,489 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 39 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 5 Unknown, 0 Unchecked, 10.9s Time] [2022-03-17 15:41:37,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-17 15:41:37,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-03-17 15:41:37,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:37,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2022-03-17 15:41:37,492 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 12 [2022-03-17 15:41:37,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:41:37,492 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2022-03-17 15:41:37,492 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:37,492 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2022-03-17 15:41:37,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-17 15:41:37,493 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:41:37,493 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:41:37,493 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-17 15:41:37,493 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:41:37,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:41:37,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1607843865, now seen corresponding path program 1 times [2022-03-17 15:41:37,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:41:37,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506396507] [2022-03-17 15:41:37,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:37,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:41:37,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:38,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:41:38,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:38,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:38,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:41:38,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506396507] [2022-03-17 15:41:38,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506396507] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:41:38,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036368753] [2022-03-17 15:41:38,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:38,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:41:38,054 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:41:38,056 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) [2022-03-17 15:41:38,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-17 15:41:38,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:38,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-17 15:41:38,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:41:38,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:38,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:41:38,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-17 15:41:38,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036368753] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:41:38,550 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:41:38,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 7] total 16 [2022-03-17 15:41:38,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338119519] [2022-03-17 15:41:38,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:41:38,551 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:41:38,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:41:38,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:41:38,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-03-17 15:41:38,552 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:40,567 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:42,751 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:44,913 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:47,081 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:49,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:49,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:41:49,392 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-03-17 15:41:49,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:41:49,393 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-17 15:41:49,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:41:49,393 INFO L225 Difference]: With dead ends: 26 [2022-03-17 15:41:49,393 INFO L226 Difference]: Without dead ends: 23 [2022-03-17 15:41:49,394 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-03-17 15:41:49,395 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 1 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2022-03-17 15:41:49,395 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 69 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 5 Unknown, 0 Unchecked, 10.8s Time] [2022-03-17 15:41:49,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-17 15:41:49,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-03-17 15:41:49,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:49,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2022-03-17 15:41:49,397 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 15 [2022-03-17 15:41:49,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:41:49,397 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2022-03-17 15:41:49,398 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:49,398 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2022-03-17 15:41:49,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-17 15:41:49,398 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:41:49,398 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:41:49,419 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-17 15:41:49,617 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:41:49,617 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:41:49,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:41:49,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1132300265, now seen corresponding path program 1 times [2022-03-17 15:41:49,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:41:49,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009409987] [2022-03-17 15:41:49,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:49,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:41:49,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:49,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:41:49,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:49,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:49,832 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:41:49,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009409987] [2022-03-17 15:41:49,833 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009409987] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 15:41:49,833 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 15:41:49,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-17 15:41:49,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518988994] [2022-03-17 15:41:49,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:41:49,833 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-17 15:41:49,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:41:49,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-17 15:41:49,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-03-17 15:41:49,834 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:51,912 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:54,096 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:54,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:41:54,283 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2022-03-17 15:41:54,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:41:54,283 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-17 15:41:54,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:41:54,284 INFO L225 Difference]: With dead ends: 25 [2022-03-17 15:41:54,284 INFO L226 Difference]: Without dead ends: 25 [2022-03-17 15:41:54,284 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-17 15:41:54,285 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 47 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-03-17 15:41:54,285 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 28 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 21 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2022-03-17 15:41:54,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-17 15:41:54,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2022-03-17 15:41:54,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:54,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2022-03-17 15:41:54,288 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 16 [2022-03-17 15:41:54,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:41:54,288 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2022-03-17 15:41:54,288 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:54,288 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2022-03-17 15:41:54,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-17 15:41:54,289 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:41:54,289 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:41:54,289 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-17 15:41:54,289 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:41:54,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:41:54,289 INFO L85 PathProgramCache]: Analyzing trace with hash -932165961, now seen corresponding path program 1 times [2022-03-17 15:41:54,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:41:54,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061223129] [2022-03-17 15:41:54,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:54,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:41:54,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:54,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:41:54,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:54,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:54,527 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:41:54,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061223129] [2022-03-17 15:41:54,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061223129] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:41:54,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352547270] [2022-03-17 15:41:54,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:41:54,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:41:54,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:41:54,529 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) [2022-03-17 15:41:54,530 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-17 15:41:54,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:41:54,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-17 15:41:54,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:41:54,912 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:41:54,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:41:55,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-17 15:41:55,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352547270] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:41:55,142 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:41:55,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 9] total 17 [2022-03-17 15:41:55,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224569706] [2022-03-17 15:41:55,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:41:55,142 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:41:55,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:41:55,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:41:55,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-03-17 15:41:55,143 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:41:57,165 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:41:59,330 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:01,443 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:03,625 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:05,788 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:06,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:42:06,002 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2022-03-17 15:42:06,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:42:06,002 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-17 15:42:06,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:42:06,003 INFO L225 Difference]: With dead ends: 31 [2022-03-17 15:42:06,003 INFO L226 Difference]: Without dead ends: 28 [2022-03-17 15:42:06,003 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-03-17 15:42:06,004 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2022-03-17 15:42:06,004 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 63 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 5 Unknown, 0 Unchecked, 10.8s Time] [2022-03-17 15:42:06,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-17 15:42:06,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2022-03-17 15:42:06,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:06,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-03-17 15:42:06,008 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 19 [2022-03-17 15:42:06,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:42:06,008 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-03-17 15:42:06,008 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:06,008 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-03-17 15:42:06,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-17 15:42:06,009 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:42:06,009 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:42:06,032 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-17 15:42:06,219 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:06,220 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:42:06,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:42:06,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1043545585, now seen corresponding path program 1 times [2022-03-17 15:42:06,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:42:06,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246691316] [2022-03-17 15:42:06,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:06,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:42:06,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:06,282 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:42:06,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:06,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:06,289 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:42:06,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246691316] [2022-03-17 15:42:06,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246691316] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:06,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963302894] [2022-03-17 15:42:06,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:06,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:06,290 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:42:06,290 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) [2022-03-17 15:42:06,291 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-17 15:42:06,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:06,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-17 15:42:06,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:42:06,649 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:06,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:42:06,867 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-17 15:42:06,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963302894] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:06,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:42:06,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-17 15:42:06,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785947680] [2022-03-17 15:42:06,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:42:06,868 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:42:06,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:42:06,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:42:06,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-17 15:42:06,868 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:08,886 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:11,010 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:13,181 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:15,292 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:17,465 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:19,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:19,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:42:19,792 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2022-03-17 15:42:19,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:42:19,792 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-17 15:42:19,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:42:19,793 INFO L225 Difference]: With dead ends: 38 [2022-03-17 15:42:19,793 INFO L226 Difference]: Without dead ends: 35 [2022-03-17 15:42:19,793 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-17 15:42:19,794 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 2 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2022-03-17 15:42:19,794 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 51 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 6 Unknown, 0 Unchecked, 12.9s Time] [2022-03-17 15:42:19,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-17 15:42:19,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-03-17 15:42:19,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:19,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 46 transitions. [2022-03-17 15:42:19,798 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 46 transitions. Word has length 20 [2022-03-17 15:42:19,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:42:19,798 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 46 transitions. [2022-03-17 15:42:19,798 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:19,798 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 46 transitions. [2022-03-17 15:42:19,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-17 15:42:19,799 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:42:19,799 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:42:19,815 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-17 15:42:19,999 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:20,000 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:42:20,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:42:20,000 INFO L85 PathProgramCache]: Analyzing trace with hash -58795524, now seen corresponding path program 1 times [2022-03-17 15:42:20,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:42:20,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700942651] [2022-03-17 15:42:20,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:20,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:42:20,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:20,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:42:20,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:20,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:20,261 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:42:20,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700942651] [2022-03-17 15:42:20,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700942651] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:20,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399592127] [2022-03-17 15:42:20,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:20,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:20,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:42:20,264 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) [2022-03-17 15:42:20,266 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-17 15:42:20,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:20,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-17 15:42:20,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:42:20,755 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:20,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:42:21,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-17 15:42:21,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399592127] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:21,030 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:42:21,030 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 9] total 20 [2022-03-17 15:42:21,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3607610] [2022-03-17 15:42:21,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:42:21,030 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:42:21,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:42:21,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:42:21,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2022-03-17 15:42:21,031 INFO L87 Difference]: Start difference. First operand 34 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:23,041 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:25,169 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:27,345 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:29,461 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:31,588 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:33,722 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:35,956 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:36,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:42:36,207 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-03-17 15:42:36,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:42:36,207 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-17 15:42:36,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:42:36,208 INFO L225 Difference]: With dead ends: 43 [2022-03-17 15:42:36,208 INFO L226 Difference]: Without dead ends: 40 [2022-03-17 15:42:36,208 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-03-17 15:42:36,208 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2022-03-17 15:42:36,209 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 52 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 7 Unknown, 0 Unchecked, 15.2s Time] [2022-03-17 15:42:36,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-17 15:42:36,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2022-03-17 15:42:36,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.4666666666666666) internal successors, (44), 30 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:36,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 48 transitions. [2022-03-17 15:42:36,211 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 48 transitions. Word has length 21 [2022-03-17 15:42:36,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:42:36,212 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 48 transitions. [2022-03-17 15:42:36,212 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:36,212 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 48 transitions. [2022-03-17 15:42:36,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-17 15:42:36,212 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:42:36,212 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:42:36,230 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-03-17 15:42:36,423 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:36,423 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:42:36,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:42:36,424 INFO L85 PathProgramCache]: Analyzing trace with hash -2116274639, now seen corresponding path program 1 times [2022-03-17 15:42:36,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:42:36,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808920505] [2022-03-17 15:42:36,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:36,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:42:36,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:36,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:42:36,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:36,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:36,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:42:36,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808920505] [2022-03-17 15:42:36,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808920505] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:36,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363343851] [2022-03-17 15:42:36,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:36,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:36,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:42:36,493 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) [2022-03-17 15:42:36,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-17 15:42:36,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:36,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-17 15:42:36,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:42:36,948 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:36,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:42:37,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-03-17 15:42:37,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363343851] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:37,158 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:42:37,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-17 15:42:37,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736808998] [2022-03-17 15:42:37,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:42:37,159 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:42:37,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:42:37,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:42:37,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-17 15:42:37,159 INFO L87 Difference]: Start difference. First operand 35 states and 48 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:39,174 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:41,346 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:43,460 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:45,679 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:47,798 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:50,035 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:52,163 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:52,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:42:52,306 INFO L93 Difference]: Finished difference Result 51 states and 73 transitions. [2022-03-17 15:42:52,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:42:52,307 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-17 15:42:52,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:42:52,308 INFO L225 Difference]: With dead ends: 51 [2022-03-17 15:42:52,308 INFO L226 Difference]: Without dead ends: 48 [2022-03-17 15:42:52,308 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-17 15:42:52,309 INFO L912 BasicCegarLoop]: 10 mSDtfsCounter, 1 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2022-03-17 15:42:52,309 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 45 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 7 Unknown, 0 Unchecked, 15.1s Time] [2022-03-17 15:42:52,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-17 15:42:52,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-17 15:42:52,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 43 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:52,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 70 transitions. [2022-03-17 15:42:52,312 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 70 transitions. Word has length 22 [2022-03-17 15:42:52,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:42:52,312 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 70 transitions. [2022-03-17 15:42:52,312 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:52,312 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 70 transitions. [2022-03-17 15:42:52,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-17 15:42:52,313 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:42:52,313 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:42:52,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-17 15:42:52,519 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:52,519 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:42:52,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:42:52,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1618193969, now seen corresponding path program 1 times [2022-03-17 15:42:52,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:42:52,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213561309] [2022-03-17 15:42:52,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:52,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:42:52,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:52,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:42:52,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:52,595 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:52,595 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:42:52,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213561309] [2022-03-17 15:42:52,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213561309] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:52,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304547973] [2022-03-17 15:42:52,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:42:52,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:42:52,595 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:42:52,596 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) [2022-03-17 15:42:52,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-17 15:42:52,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:42:52,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-17 15:42:52,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:42:53,128 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:42:53,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:42:53,322 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-17 15:42:53,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304547973] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:42:53,322 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:42:53,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-17 15:42:53,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476515078] [2022-03-17 15:42:53,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:42:53,323 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:42:53,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:42:53,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:42:53,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-17 15:42:53,323 INFO L87 Difference]: Start difference. First operand 48 states and 70 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:42:55,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:57,509 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:42:59,680 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:01,811 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:02,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:43:02,003 INFO L93 Difference]: Finished difference Result 57 states and 83 transitions. [2022-03-17 15:43:02,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:43:02,004 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-17 15:43:02,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:43:02,004 INFO L225 Difference]: With dead ends: 57 [2022-03-17 15:43:02,004 INFO L226 Difference]: Without dead ends: 54 [2022-03-17 15:43:02,005 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-17 15:43:02,005 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 2 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2022-03-17 15:43:02,005 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 51 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 4 Unknown, 0 Unchecked, 8.7s Time] [2022-03-17 15:43:02,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-17 15:43:02,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2022-03-17 15:43:02,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.55) internal successors, (62), 40 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:02,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 66 transitions. [2022-03-17 15:43:02,008 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 66 transitions. Word has length 24 [2022-03-17 15:43:02,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:43:02,009 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 66 transitions. [2022-03-17 15:43:02,009 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:02,009 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 66 transitions. [2022-03-17 15:43:02,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-17 15:43:02,009 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:43:02,009 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:43:02,025 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-17 15:43:02,213 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:02,214 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:43:02,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:43:02,214 INFO L85 PathProgramCache]: Analyzing trace with hash 850752026, now seen corresponding path program 1 times [2022-03-17 15:43:02,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:43:02,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380925914] [2022-03-17 15:43:02,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:02,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:43:02,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:02,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:43:02,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:02,432 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:02,432 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:43:02,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380925914] [2022-03-17 15:43:02,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380925914] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:02,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479277393] [2022-03-17 15:43:02,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:02,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:02,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:43:02,436 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) [2022-03-17 15:43:02,437 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-17 15:43:02,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:02,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-17 15:43:02,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:43:02,932 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:02,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:43:03,232 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-17 15:43:03,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479277393] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:03,232 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:43:03,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 21 [2022-03-17 15:43:03,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374717545] [2022-03-17 15:43:03,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:43:03,232 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:43:03,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:43:03,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:43:03,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2022-03-17 15:43:03,233 INFO L87 Difference]: Start difference. First operand 45 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:05,247 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:07,420 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:09,654 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:11,824 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:13,933 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:14,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:43:14,069 INFO L93 Difference]: Finished difference Result 54 states and 79 transitions. [2022-03-17 15:43:14,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:43:14,069 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-17 15:43:14,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:43:14,070 INFO L225 Difference]: With dead ends: 54 [2022-03-17 15:43:14,070 INFO L226 Difference]: Without dead ends: 51 [2022-03-17 15:43:14,070 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2022-03-17 15:43:14,070 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2022-03-17 15:43:14,071 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 51 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 5 Unknown, 0 Unchecked, 10.8s Time] [2022-03-17 15:43:14,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-17 15:43:14,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 40. [2022-03-17 15:43:14,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:14,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2022-03-17 15:43:14,073 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 25 [2022-03-17 15:43:14,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:43:14,073 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2022-03-17 15:43:14,073 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:14,074 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2022-03-17 15:43:14,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-17 15:43:14,074 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:43:14,074 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:43:14,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-17 15:43:14,275 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:14,276 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:43:14,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:43:14,276 INFO L85 PathProgramCache]: Analyzing trace with hash 309895635, now seen corresponding path program 1 times [2022-03-17 15:43:14,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:43:14,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972380668] [2022-03-17 15:43:14,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:14,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:43:14,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:14,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:43:14,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:14,469 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-17 15:43:14,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:43:14,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972380668] [2022-03-17 15:43:14,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972380668] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:14,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613377884] [2022-03-17 15:43:14,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:14,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:14,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:43:14,470 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) [2022-03-17 15:43:14,472 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-17 15:43:14,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:14,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-17 15:43:14,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:43:15,018 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:15,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:43:15,267 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-17 15:43:15,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613377884] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:15,268 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:43:15,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 11] total 19 [2022-03-17 15:43:15,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006046840] [2022-03-17 15:43:15,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:43:15,268 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:43:15,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:43:15,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:43:15,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2022-03-17 15:43:15,269 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:17,286 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:19,462 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:21,650 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:23,764 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:25,899 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:28,119 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:28,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:43:28,262 INFO L93 Difference]: Finished difference Result 56 states and 83 transitions. [2022-03-17 15:43:28,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:43:28,262 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-17 15:43:28,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:43:28,262 INFO L225 Difference]: With dead ends: 56 [2022-03-17 15:43:28,262 INFO L226 Difference]: Without dead ends: 53 [2022-03-17 15:43:28,263 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 40 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2022-03-17 15:43:28,263 INFO L912 BasicCegarLoop]: 10 mSDtfsCounter, 1 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-03-17 15:43:28,263 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 46 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 6 Unknown, 0 Unchecked, 13.0s Time] [2022-03-17 15:43:28,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-17 15:43:28,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 40. [2022-03-17 15:43:28,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:28,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2022-03-17 15:43:28,266 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 26 [2022-03-17 15:43:28,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:43:28,266 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2022-03-17 15:43:28,266 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:28,266 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2022-03-17 15:43:28,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-17 15:43:28,266 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:43:28,267 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:43:28,287 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-17 15:43:28,479 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-17 15:43:28,479 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:43:28,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:43:28,480 INFO L85 PathProgramCache]: Analyzing trace with hash 522176238, now seen corresponding path program 1 times [2022-03-17 15:43:28,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:43:28,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459067878] [2022-03-17 15:43:28,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:28,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:43:28,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:28,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:43:28,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:28,722 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:28,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:43:28,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459067878] [2022-03-17 15:43:28,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459067878] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:28,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443783734] [2022-03-17 15:43:28,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:28,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:28,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:43:28,723 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) [2022-03-17 15:43:28,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-17 15:43:28,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:28,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-17 15:43:28,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:43:29,258 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:29,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:43:29,573 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-17 15:43:29,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443783734] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:29,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:43:29,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11, 11] total 23 [2022-03-17 15:43:29,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228803454] [2022-03-17 15:43:29,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:43:29,574 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:43:29,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:43:29,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:43:29,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2022-03-17 15:43:29,574 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:31,589 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:33,760 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:35,878 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:38,078 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:40,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:40,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:43:40,402 INFO L93 Difference]: Finished difference Result 69 states and 105 transitions. [2022-03-17 15:43:40,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:43:40,403 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-17 15:43:40,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:43:40,403 INFO L225 Difference]: With dead ends: 69 [2022-03-17 15:43:40,403 INFO L226 Difference]: Without dead ends: 66 [2022-03-17 15:43:40,404 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2022-03-17 15:43:40,404 INFO L912 BasicCegarLoop]: 10 mSDtfsCounter, 1 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2022-03-17 15:43:40,404 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 45 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 5 Unknown, 0 Unchecked, 10.8s Time] [2022-03-17 15:43:40,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-17 15:43:40,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-03-17 15:43:40,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.6065573770491803) internal successors, (98), 61 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:40,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 102 transitions. [2022-03-17 15:43:40,407 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 102 transitions. Word has length 28 [2022-03-17 15:43:40,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:43:40,407 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 102 transitions. [2022-03-17 15:43:40,407 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:40,407 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 102 transitions. [2022-03-17 15:43:40,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-17 15:43:40,408 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 15:43:40,408 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:43:40,424 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-17 15:43:40,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:40,623 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 15:43:40,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 15:43:40,624 INFO L85 PathProgramCache]: Analyzing trace with hash 2133946640, now seen corresponding path program 1 times [2022-03-17 15:43:40,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 15:43:40,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582218756] [2022-03-17 15:43:40,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:40,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 15:43:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:40,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 15:43:40,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:40,702 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:40,703 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 15:43:40,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582218756] [2022-03-17 15:43:40,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582218756] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:40,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060517308] [2022-03-17 15:43:40,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 15:43:40,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 15:43:40,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 15:43:40,704 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) [2022-03-17 15:43:40,719 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-17 15:43:40,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 15:43:40,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-17 15:43:40,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 15:43:41,301 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 15:43:41,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 15:43:41,624 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-03-17 15:43:41,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060517308] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-17 15:43:41,624 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-17 15:43:41,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 13] total 20 [2022-03-17 15:43:41,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631394561] [2022-03-17 15:43:41,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 15:43:41,624 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-17 15:43:41,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 15:43:41,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-17 15:43:41,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2022-03-17 15:43:41,625 INFO L87 Difference]: Start difference. First operand 66 states and 102 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:43,642 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:45,819 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:48,033 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-17 15:43:48,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 15:43:48,262 INFO L93 Difference]: Finished difference Result 64 states and 100 transitions. [2022-03-17 15:43:48,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-17 15:43:48,262 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-17 15:43:48,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 15:43:48,262 INFO L225 Difference]: With dead ends: 64 [2022-03-17 15:43:48,262 INFO L226 Difference]: Without dead ends: 0 [2022-03-17 15:43:48,263 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2022-03-17 15:43:48,263 INFO L912 BasicCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-03-17 15:43:48,263 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 36 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 3 Unknown, 0 Unchecked, 6.6s Time] [2022-03-17 15:43:48,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-17 15:43:48,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-17 15:43:48,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2022-03-17 15:43:48,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-17 15:43:48,264 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 32 [2022-03-17 15:43:48,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 15:43:48,264 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-17 15:43:48,264 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 15:43:48,264 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-17 15:43:48,264 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-17 15:43:48,266 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-17 15:43:48,282 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-03-17 15:43:48,467 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-17 15:43:48,469 INFO L718 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 15:43:48,470 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-17 15:43:48,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.03 03:43:48 BasicIcfg [2022-03-17 15:43:48,471 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-17 15:43:48,472 INFO L158 Benchmark]: Toolchain (without parser) took 149556.25ms. Allocated memory was 194.0MB in the beginning and 269.5MB in the end (delta: 75.5MB). Free memory was 139.8MB in the beginning and 132.8MB in the end (delta: 7.0MB). Peak memory consumption was 83.7MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,472 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 194.0MB. Free memory was 156.5MB in the beginning and 156.4MB in the end (delta: 129.4kB). There was no memory consumed. Max. memory is 8.0GB. [2022-03-17 15:43:48,472 INFO L158 Benchmark]: CACSL2BoogieTranslator took 239.56ms. Allocated memory was 194.0MB in the beginning and 269.5MB in the end (delta: 75.5MB). Free memory was 139.6MB in the beginning and 241.3MB in the end (delta: -101.7MB). Peak memory consumption was 10.9MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,472 INFO L158 Benchmark]: Boogie Preprocessor took 38.00ms. Allocated memory is still 269.5MB. Free memory was 241.3MB in the beginning and 239.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,472 INFO L158 Benchmark]: RCFGBuilder took 6757.35ms. Allocated memory is still 269.5MB. Free memory was 239.7MB in the beginning and 227.7MB in the end (delta: 12.1MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,472 INFO L158 Benchmark]: IcfgTransformer took 26.99ms. Allocated memory is still 269.5MB. Free memory was 227.7MB in the beginning and 226.6MB in the end (delta: 1.0MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,473 INFO L158 Benchmark]: TraceAbstraction took 142489.60ms. Allocated memory is still 269.5MB. Free memory was 226.1MB in the beginning and 132.8MB in the end (delta: 93.3MB). Peak memory consumption was 94.3MB. Max. memory is 8.0GB. [2022-03-17 15:43:48,473 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 194.0MB. Free memory was 156.5MB in the beginning and 156.4MB in the end (delta: 129.4kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 239.56ms. Allocated memory was 194.0MB in the beginning and 269.5MB in the end (delta: 75.5MB). Free memory was 139.6MB in the beginning and 241.3MB in the end (delta: -101.7MB). Peak memory consumption was 10.9MB. Max. memory is 8.0GB. * Boogie Preprocessor took 38.00ms. Allocated memory is still 269.5MB. Free memory was 241.3MB in the beginning and 239.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 6757.35ms. Allocated memory is still 269.5MB. Free memory was 239.7MB in the beginning and 227.7MB in the end (delta: 12.1MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * IcfgTransformer took 26.99ms. Allocated memory is still 269.5MB. Free memory was 227.7MB in the beginning and 226.6MB in the end (delta: 1.0MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * TraceAbstraction took 142489.60ms. Allocated memory is still 269.5MB. Free memory was 226.1MB in the beginning and 132.8MB in the end (delta: 93.3MB). Peak memory consumption was 94.3MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 10]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 142.4s, OverallIterations: 13, TraceHistogramMax: 4, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 130.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 60 mSolverCounterUnknown, 103 SdHoareTripleChecker+Valid, 130.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 102 mSDsluCounter, 608 SdHoareTripleChecker+Invalid, 121.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 421 mSDsCounter, 25 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 561 IncrementalHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 25 mSolverCounterUnsat, 187 mSDtfsCounter, 561 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 586 GetRequests, 364 SyntacticMatches, 36 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1025 ImplicationChecksByTransitivity, 4.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred in iteration=12, InterpolantAutomatonStates: 75, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 13 MinimizatonAttempts, 45 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 9.2s InterpolantComputationTime, 504 NumberOfCodeBlocks, 504 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 703 ConstructedInterpolants, 0 QuantifiedInterpolants, 8294 SizeOfPredicates, 10 NumberOfNonLiveVariables, 952 ConjunctsInSsa, 270 ConjunctsInUnsatCore, 33 InterpolantComputations, 13 PerfectInterpolantSequences, 140/307 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2022-03-17 15:43:48,499 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...