/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/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 21:10:42,020 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 21:10:42,052 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 21:10:42,073 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 21:10:42,100 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 21:10:42,100 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 21:10:42,106 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 21:10:42,107 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 21:10:42,115 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 21:10:42,116 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 21:10:42,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 21:10:42,116 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 21:10:42,117 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 21:10:42,118 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:10:42,118 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 21:10:42,118 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 21:10:42,119 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 21:10:42,286 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 21:10:42,308 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 21:10:42,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 21:10:42,310 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 21:10:42,311 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 21:10:42,311 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2022-04-06 21:10:42,363 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fd122cf2/092a7676142747e6bce9631dbe27f271/FLAG6ac429fa3 [2022-04-06 21:10:42,711 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 21:10:42,711 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2022-04-06 21:10:42,715 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fd122cf2/092a7676142747e6bce9631dbe27f271/FLAG6ac429fa3 [2022-04-06 21:10:42,722 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6fd122cf2/092a7676142747e6bce9631dbe27f271 [2022-04-06 21:10:42,724 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 21:10:42,725 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 21:10:42,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 21:10:42,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 21:10:42,731 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 21:10:42,731 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,732 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@456dbafe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42, skipping insertion in model container [2022-04-06 21:10:42,732 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,736 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 21:10:42,748 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 21:10:42,859 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c[525,538] [2022-04-06 21:10:42,878 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:10:42,883 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 21:10:42,890 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c[525,538] [2022-04-06 21:10:42,898 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:10:42,905 INFO L208 MainTranslator]: Completed translation [2022-04-06 21:10:42,906 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42 WrapperNode [2022-04-06 21:10:42,906 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 21:10:42,907 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 21:10:42,907 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 21:10:42,907 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 21:10:42,913 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,913 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,917 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,917 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,920 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,922 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,923 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,924 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 21:10:42,924 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 21:10:42,925 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 21:10:42,925 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 21:10:42,925 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (1/1) ... [2022-04-06 21:10:42,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:10:42,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:10:42,952 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) [2022-04-06 21:10:42,961 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 [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 21:10:42,979 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 21:10:42,979 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 21:10:42,979 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 21:10:42,980 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 21:10:43,025 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 21:10:43,026 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 21:10:43,149 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 21:10:43,153 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 21:10:43,153 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 21:10:43,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:10:43 BoogieIcfgContainer [2022-04-06 21:10:43,154 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 21:10:43,155 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 21:10:43,155 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 21:10:43,157 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 21:10:43,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 09:10:42" (1/3) ... [2022-04-06 21:10:43,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32e46984 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:10:43, skipping insertion in model container [2022-04-06 21:10:43,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:10:42" (2/3) ... [2022-04-06 21:10:43,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32e46984 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:10:43, skipping insertion in model container [2022-04-06 21:10:43,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:10:43" (3/3) ... [2022-04-06 21:10:43,159 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u.c [2022-04-06 21:10:43,162 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 21:10:43,162 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 21:10:43,198 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 21:10:43,207 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, 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 [2022-04-06 21:10:43,207 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 21:10:43,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 21:10:43,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-04-06 21:10:43,235 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:10:43,235 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:10:43,236 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:10:43,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:10:43,239 INFO L85 PathProgramCache]: Analyzing trace with hash 818818098, now seen corresponding path program 1 times [2022-04-06 21:10:43,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:43,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2029193986] [2022-04-06 21:10:43,253 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:10:43,253 INFO L85 PathProgramCache]: Analyzing trace with hash 818818098, now seen corresponding path program 2 times [2022-04-06 21:10:43,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:10:43,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937879521] [2022-04-06 21:10:43,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:10:43,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:10:43,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:43,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 21:10:43,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:43,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 21:10:43,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:43,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:10:43,404 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:10:43,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937879521] [2022-04-06 21:10:43,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937879521] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:43,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:43,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:10:43,406 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:10:43,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2029193986] [2022-04-06 21:10:43,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2029193986] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:43,407 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:43,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:10:43,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587567765] [2022-04-06 21:10:43,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:10:43,410 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 21:10:43,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:43,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 21:10:43,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 21:10:43,426 INFO L87 Difference]: Start difference. First operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:45,512 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 [] [2022-04-06 21:10:45,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:10:45,745 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2022-04-06 21:10:45,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 21:10:45,747 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-04-06 21:10:45,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:10:45,752 INFO L225 Difference]: With dead ends: 65 [2022-04-06 21:10:45,752 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 21:10:45,753 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 21:10:45,756 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-04-06 21:10:45,756 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 10 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-04-06 21:10:45,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 21:10:45,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 21:10:45,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 21:10:45,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-04-06 21:10:45,785 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2022-04-06 21:10:45,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:10:45,785 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-04-06 21:10:45,786 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:45,786 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-04-06 21:10:45,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-06 21:10:45,786 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:10:45,786 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:10:45,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 21:10:45,787 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:10:45,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:10:45,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1723375776, now seen corresponding path program 1 times [2022-04-06 21:10:45,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:45,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [715638573] [2022-04-06 21:10:45,788 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:10:45,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1723375776, now seen corresponding path program 2 times [2022-04-06 21:10:45,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:10:45,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283989567] [2022-04-06 21:10:45,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:10:45,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:10:45,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:45,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 21:10:45,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:45,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 21:10:45,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:45,978 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:10:45,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:10:45,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283989567] [2022-04-06 21:10:45,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283989567] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:45,988 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:45,988 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 21:10:45,988 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:10:45,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [715638573] [2022-04-06 21:10:45,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [715638573] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:45,989 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:45,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 21:10:45,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026416420] [2022-04-06 21:10:45,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:10:45,989 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 21:10:45,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:45,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 21:10:45,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-04-06 21:10:45,990 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:50,378 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 [] [2022-04-06 21:10:50,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:10:50,682 INFO L93 Difference]: Finished difference Result 67 states and 96 transitions. [2022-04-06 21:10:50,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 21:10:50,684 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2022-04-06 21:10:50,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:10:50,685 INFO L225 Difference]: With dead ends: 67 [2022-04-06 21:10:50,685 INFO L226 Difference]: Without dead ends: 47 [2022-04-06 21:10:50,685 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-04-06 21:10:50,686 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 35 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 54 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-04-06 21:10:50,687 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 178 Invalid, 1 Unknown, 0 Unchecked, 4.6s Time] [2022-04-06 21:10:50,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-04-06 21:10:50,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-04-06 21:10:50,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-04-06 21:10:50,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 63 transitions. [2022-04-06 21:10:50,699 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 63 transitions. Word has length 19 [2022-04-06 21:10:50,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:10:50,699 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 63 transitions. [2022-04-06 21:10:50,700 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:50,700 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 63 transitions. [2022-04-06 21:10:50,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-06 21:10:50,700 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:10:50,700 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:10:50,700 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 21:10:50,700 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:10:50,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:10:50,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1182987237, now seen corresponding path program 1 times [2022-04-06 21:10:50,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:50,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1370255495] [2022-04-06 21:10:50,710 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:10:50,711 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:10:50,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1182987237, now seen corresponding path program 2 times [2022-04-06 21:10:50,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:10:50,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281691274] [2022-04-06 21:10:50,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:10:50,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:10:50,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:50,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 21:10:50,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:50,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 21:10:50,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:10:50,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:10:50,899 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:10:50,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281691274] [2022-04-06 21:10:50,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281691274] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:10:50,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905588808] [2022-04-06 21:10:50,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:10:50,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:10:50,901 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:10:50,902 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) [2022-04-06 21:10:50,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 21:10:50,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 21:10:50,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:10:50,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-06 21:10:50,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:10:51,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 21:10:51,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 21:10:51,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905588808] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:51,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:10:51,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2022-04-06 21:10:51,171 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:10:51,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1370255495] [2022-04-06 21:10:51,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1370255495] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:51,171 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:51,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 21:10:51,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681981981] [2022-04-06 21:10:51,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:10:51,172 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 21:10:51,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:51,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 21:10:51,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-04-06 21:10:51,173 INFO L87 Difference]: Start difference. First operand 47 states and 63 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:54,205 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 [] [2022-04-06 21:10:56,071 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 21:10:56,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:10:56,266 INFO L93 Difference]: Finished difference Result 76 states and 110 transitions. [2022-04-06 21:10:56,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 21:10:56,267 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2022-04-06 21:10:56,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:10:56,268 INFO L225 Difference]: With dead ends: 76 [2022-04-06 21:10:56,268 INFO L226 Difference]: Without dead ends: 70 [2022-04-06 21:10:56,268 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-06 21:10:56,269 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:10:56,270 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 145 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 118 Invalid, 1 Unknown, 0 Unchecked, 5.0s Time] [2022-04-06 21:10:56,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-04-06 21:10:56,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 62. [2022-04-06 21:10:56,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 26 states have call successors, (26), 6 states have call predecessors, (26), 5 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2022-04-06 21:10:56,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 86 transitions. [2022-04-06 21:10:56,282 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 86 transitions. Word has length 21 [2022-04-06 21:10:56,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:10:56,282 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 86 transitions. [2022-04-06 21:10:56,282 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-04-06 21:10:56,282 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 86 transitions. [2022-04-06 21:10:56,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-06 21:10:56,283 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:10:56,283 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:10:56,316 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 21:10:56,491 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 [2022-04-06 21:10:56,492 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:10:56,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:10:56,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1777258624, now seen corresponding path program 1 times [2022-04-06 21:10:56,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:56,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2114468185] [2022-04-06 21:10:56,493 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:10:56,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1777258624, now seen corresponding path program 2 times [2022-04-06 21:10:56,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:10:56,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934785887] [2022-04-06 21:10:56,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:10:56,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:10:56,502 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:10:56,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2040909256] [2022-04-06 21:10:56,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:10:56,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:10:56,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:10:56,503 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) [2022-04-06 21:10:56,504 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 21:10:56,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:10:56,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:10:56,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 21:10:56,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:10:56,669 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 21:10:56,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 21:10:56,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:10:56,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934785887] [2022-04-06 21:10:56,670 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:10:56,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040909256] [2022-04-06 21:10:56,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040909256] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:56,670 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:56,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:10:56,673 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:10:56,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2114468185] [2022-04-06 21:10:56,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2114468185] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:56,675 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:56,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:10:56,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135414598] [2022-04-06 21:10:56,678 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:10:56,679 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:10:56,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:56,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:10:56,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 21:10:56,681 INFO L87 Difference]: Start difference. First operand 62 states and 86 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 21:10:58,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 21:10:59,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:10:59,346 INFO L93 Difference]: Finished difference Result 73 states and 95 transitions. [2022-04-06 21:10:59,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:10:59,348 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2022-04-06 21:10:59,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:10:59,350 INFO L225 Difference]: With dead ends: 73 [2022-04-06 21:10:59,350 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 21:10:59,350 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 21:10:59,351 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 6 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-04-06 21:10:59,351 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 136 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2022-04-06 21:10:59,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 21:10:59,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 21:10:59,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 20 states have call successors, (20), 5 states have call predecessors, (20), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-04-06 21:10:59,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 68 transitions. [2022-04-06 21:10:59,358 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 68 transitions. Word has length 29 [2022-04-06 21:10:59,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:10:59,358 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 68 transitions. [2022-04-06 21:10:59,358 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 21:10:59,359 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 68 transitions. [2022-04-06 21:10:59,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-04-06 21:10:59,359 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:10:59,359 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:10:59,368 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 21:10:59,563 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-04-06 21:10:59,563 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:10:59,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:10:59,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1684913467, now seen corresponding path program 1 times [2022-04-06 21:10:59,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:59,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1140905092] [2022-04-06 21:10:59,565 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:10:59,565 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:10:59,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1684913467, now seen corresponding path program 2 times [2022-04-06 21:10:59,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:10:59,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552492236] [2022-04-06 21:10:59,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:10:59,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:10:59,585 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:10:59,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [529663249] [2022-04-06 21:10:59,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:10:59,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:10:59,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:10:59,586 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) [2022-04-06 21:10:59,588 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 21:10:59,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:10:59,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:10:59,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 21:10:59,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:10:59,734 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 21:10:59,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 21:10:59,735 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:10:59,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552492236] [2022-04-06 21:10:59,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:10:59,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529663249] [2022-04-06 21:10:59,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529663249] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:59,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:59,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:10:59,736 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:10:59,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1140905092] [2022-04-06 21:10:59,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1140905092] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:10:59,737 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:10:59,737 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:10:59,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662505385] [2022-04-06 21:10:59,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:10:59,737 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:10:59,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:10:59,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:10:59,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 21:10:59,737 INFO L87 Difference]: Start difference. First operand 50 states and 68 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 21:11:01,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:11:01,005 INFO L93 Difference]: Finished difference Result 67 states and 89 transitions. [2022-04-06 21:11:01,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:11:01,006 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2022-04-06 21:11:01,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:11:01,007 INFO L225 Difference]: With dead ends: 67 [2022-04-06 21:11:01,007 INFO L226 Difference]: Without dead ends: 64 [2022-04-06 21:11:01,007 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 21:11:01,008 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-04-06 21:11:01,008 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 142 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-04-06 21:11:01,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-04-06 21:11:01,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-04-06 21:11:01,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 25 states have call successors, (25), 7 states have call predecessors, (25), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-04-06 21:11:01,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 85 transitions. [2022-04-06 21:11:01,016 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 85 transitions. Word has length 31 [2022-04-06 21:11:01,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:11:01,016 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 85 transitions. [2022-04-06 21:11:01,016 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 21:11:01,016 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 85 transitions. [2022-04-06 21:11:01,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-04-06 21:11:01,017 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:11:01,017 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:11:01,025 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-04-06 21:11:01,221 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:11:01,221 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:11:01,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:11:01,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1928736347, now seen corresponding path program 1 times [2022-04-06 21:11:01,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:11:01,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [337395546] [2022-04-06 21:11:01,223 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:11:01,223 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:11:01,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1928736347, now seen corresponding path program 2 times [2022-04-06 21:11:01,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:11:01,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923547435] [2022-04-06 21:11:01,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:11:01,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:11:01,244 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:11:01,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1312325081] [2022-04-06 21:11:01,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:11:01,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:11:01,245 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:11:01,251 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) [2022-04-06 21:11:01,280 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process