/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/loops/n.c11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 17:46:13,378 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 17:46:13,380 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 17:46:13,428 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 17:46:13,462 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 17:46:13,463 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 17:46:13,464 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 17:46:13,464 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 17:46:13,472 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 17:46:13,473 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 17:46:13,475 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 17:46:13,476 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 17:46:13,476 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 17:46:13,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 17:46:13,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 17:46:13,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 17:46:13,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 17:46:13,478 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 17:46:13,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 17:46:13,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 17:46:13,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 17:46:13,478 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 17:46:13,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 17:46:13,479 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 17:46:13,479 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 17:46:13,479 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 17:46:13,709 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 17:46:13,736 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 17:46:13,738 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 17:46:13,739 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 17:46:13,740 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 17:46:13,741 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/n.c11.c [2022-03-20 17:46:13,805 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aba573e71/9fc08377aec0440f90c0b04ec75aa287/FLAG0e2fb32e7 [2022-03-20 17:46:14,233 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 17:46:14,234 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c11.c [2022-03-20 17:46:14,239 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aba573e71/9fc08377aec0440f90c0b04ec75aa287/FLAG0e2fb32e7 [2022-03-20 17:46:14,255 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aba573e71/9fc08377aec0440f90c0b04ec75aa287 [2022-03-20 17:46:14,258 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 17:46:14,259 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 17:46:14,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 17:46:14,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 17:46:14,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 17:46:14,265 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a538335 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14, skipping insertion in model container [2022-03-20 17:46:14,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,273 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 17:46:14,284 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 17:46:14,404 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/n.c11.c[317,330] [2022-03-20 17:46:14,424 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 17:46:14,431 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 17:46:14,476 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/n.c11.c[317,330] [2022-03-20 17:46:14,490 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 17:46:14,506 INFO L208 MainTranslator]: Completed translation [2022-03-20 17:46:14,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14 WrapperNode [2022-03-20 17:46:14,507 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 17:46:14,508 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 17:46:14,508 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 17:46:14,509 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 17:46:14,519 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,526 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,531 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,535 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,543 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,545 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 17:46:14,545 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 17:46:14,546 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 17:46:14,546 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 17:46:14,547 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (1/1) ... [2022-03-20 17:46:14,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 17:46:14,567 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:14,581 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) [2022-03-20 17:46:14,607 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 [2022-03-20 17:46:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 17:46:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 17:46:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 17:46:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 17:46:14,631 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 17:46:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 17:46:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 17:46:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 17:46:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 17:46:14,632 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 17:46:14,633 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-03-20 17:46:14,633 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 17:46:14,633 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 17:46:14,633 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 17:46:14,634 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 17:46:14,635 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 17:46:14,635 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 17:46:14,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 17:46:14,685 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 17:46:14,686 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 17:46:14,774 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 17:46:14,780 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 17:46:14,780 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 17:46:14,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 05:46:14 BoogieIcfgContainer [2022-03-20 17:46:14,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 17:46:14,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 17:46:14,784 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 17:46:14,791 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 17:46:14,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 05:46:14" (1/3) ... [2022-03-20 17:46:14,792 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70cfcc95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 05:46:14, skipping insertion in model container [2022-03-20 17:46:14,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 05:46:14" (2/3) ... [2022-03-20 17:46:14,792 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70cfcc95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 05:46:14, skipping insertion in model container [2022-03-20 17:46:14,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 05:46:14" (3/3) ... [2022-03-20 17:46:14,793 INFO L111 eAbstractionObserver]: Analyzing ICFG n.c11.c [2022-03-20 17:46:14,810 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 17:46:14,810 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 17:46:14,849 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 17:46:14,874 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 [2022-03-20 17:46:14,874 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 17:46:14,903 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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) [2022-03-20 17:46:14,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 17:46:14,910 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:14,911 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:14,911 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:14,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:14,918 INFO L85 PathProgramCache]: Analyzing trace with hash 536722933, now seen corresponding path program 1 times [2022-03-20 17:46:14,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:14,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [706448653] [2022-03-20 17:46:14,934 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 17:46:14,934 INFO L85 PathProgramCache]: Analyzing trace with hash 536722933, now seen corresponding path program 2 times [2022-03-20 17:46:14,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:14,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662094618] [2022-03-20 17:46:14,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:14,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:15,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:15,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:15,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662094618] [2022-03-20 17:46:15,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662094618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:15,103 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:15,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 17:46:15,107 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:15,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [706448653] [2022-03-20 17:46:15,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [706448653] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:15,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:15,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 17:46:15,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923505864] [2022-03-20 17:46:15,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:15,115 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 17:46:15,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 17:46:15,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 17:46:15,150 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-03-20 17:46:15,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:15,219 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2022-03-20 17:46:15,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 17:46:15,222 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2022-03-20 17:46:15,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:15,239 INFO L225 Difference]: With dead ends: 33 [2022-03-20 17:46:15,239 INFO L226 Difference]: Without dead ends: 14 [2022-03-20 17:46:15,244 INFO L912 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 [2022-03-20 17:46:15,246 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 13 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:15,248 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 24 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:46:15,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-20 17:46:15,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-20 17:46:15,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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) [2022-03-20 17:46:15,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-03-20 17:46:15,289 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-03-20 17:46:15,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:15,289 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-03-20 17:46:15,290 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-03-20 17:46:15,290 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-03-20 17:46:15,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 17:46:15,290 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:15,290 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:15,291 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 17:46:15,294 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:15,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:15,297 INFO L85 PathProgramCache]: Analyzing trace with hash 526564202, now seen corresponding path program 1 times [2022-03-20 17:46:15,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [321429115] [2022-03-20 17:46:15,301 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 17:46:15,301 INFO L85 PathProgramCache]: Analyzing trace with hash 526564202, now seen corresponding path program 2 times [2022-03-20 17:46:15,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:15,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445667595] [2022-03-20 17:46:15,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:15,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:15,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:15,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:15,444 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:15,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445667595] [2022-03-20 17:46:15,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445667595] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:15,445 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:15,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:46:15,445 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:15,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [321429115] [2022-03-20 17:46:15,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [321429115] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:15,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:15,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 17:46:15,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757419783] [2022-03-20 17:46:15,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:15,447 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 17:46:15,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 17:46:15,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 17:46:15,448 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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) [2022-03-20 17:46:15,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:15,551 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-20 17:46:15,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 17:46:15,551 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2022-03-20 17:46:15,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:15,553 INFO L225 Difference]: With dead ends: 28 [2022-03-20 17:46:15,553 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 17:46:15,554 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-20 17:46:15,558 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:15,559 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 29 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:46:15,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 17:46:15,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-03-20 17:46:15,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2022-03-20 17:46:15,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-03-20 17:46:15,581 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-03-20 17:46:15,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:15,581 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-03-20 17:46:15,581 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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) [2022-03-20 17:46:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-03-20 17:46:15,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 17:46:15,582 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:15,582 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:15,582 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 17:46:15,582 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:15,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:15,583 INFO L85 PathProgramCache]: Analyzing trace with hash -234031063, now seen corresponding path program 1 times [2022-03-20 17:46:15,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:15,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1587770684] [2022-03-20 17:46:15,590 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:15,590 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:15,590 INFO L85 PathProgramCache]: Analyzing trace with hash -234031063, now seen corresponding path program 2 times [2022-03-20 17:46:15,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:15,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719873197] [2022-03-20 17:46:15,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:15,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:15,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:15,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:15,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:15,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:15,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719873197] [2022-03-20 17:46:15,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719873197] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:15,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933860729] [2022-03-20 17:46:15,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:15,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:15,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:15,736 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) [2022-03-20 17:46:15,737 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 17:46:15,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:15,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:15,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 17:46:15,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:15,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:15,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:16,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:16,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933860729] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:16,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:16,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2022-03-20 17:46:16,003 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:16,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1587770684] [2022-03-20 17:46:16,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1587770684] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:16,003 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:16,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 17:46:16,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481096950] [2022-03-20 17:46:16,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:16,004 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 17:46:16,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:16,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 17:46:16,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-03-20 17:46:16,005 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 5 states have internal predecessors, (10), 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) [2022-03-20 17:46:16,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:16,122 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-03-20 17:46:16,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 17:46:16,123 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 5 states have internal predecessors, (10), 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 14 [2022-03-20 17:46:16,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:16,124 INFO L225 Difference]: With dead ends: 31 [2022-03-20 17:46:16,124 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 17:46:16,125 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-03-20 17:46:16,126 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:16,126 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 29 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:16,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 17:46:16,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-03-20 17:46:16,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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) [2022-03-20 17:46:16,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-03-20 17:46:16,132 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2022-03-20 17:46:16,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:16,132 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-03-20 17:46:16,132 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 5 states have internal predecessors, (10), 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) [2022-03-20 17:46:16,132 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-03-20 17:46:16,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 17:46:16,133 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:16,133 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:16,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:16,355 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 [2022-03-20 17:46:16,356 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:16,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:16,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1119883018, now seen corresponding path program 3 times [2022-03-20 17:46:16,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:16,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1632327534] [2022-03-20 17:46:16,358 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:16,358 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:16,359 INFO L85 PathProgramCache]: Analyzing trace with hash 1119883018, now seen corresponding path program 4 times [2022-03-20 17:46:16,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:16,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462125565] [2022-03-20 17:46:16,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:16,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:16,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:16,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:16,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:16,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:16,475 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:16,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462125565] [2022-03-20 17:46:16,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462125565] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:16,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933374884] [2022-03-20 17:46:16,476 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:16,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:16,476 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:16,477 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) [2022-03-20 17:46:16,479 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 17:46:16,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:16,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:16,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 17:46:16,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:16,638 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:16,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:16,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:16,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933374884] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:16,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:16,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-20 17:46:16,728 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:16,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1632327534] [2022-03-20 17:46:16,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1632327534] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:16,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:16,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:46:16,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689064961] [2022-03-20 17:46:16,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:16,729 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:46:16,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:16,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:46:16,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:46:16,730 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 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) [2022-03-20 17:46:16,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:16,829 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2022-03-20 17:46:16,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:46:16,830 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 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 17 [2022-03-20 17:46:16,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:16,831 INFO L225 Difference]: With dead ends: 37 [2022-03-20 17:46:16,831 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 17:46:16,831 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2022-03-20 17:46:16,832 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 24 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:16,833 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 40 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:46:16,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 17:46:16,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-03-20 17:46:16,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 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) [2022-03-20 17:46:16,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-03-20 17:46:16,838 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-03-20 17:46:16,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:16,839 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-03-20 17:46:16,839 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 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) [2022-03-20 17:46:16,839 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-03-20 17:46:16,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 17:46:16,840 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:16,840 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:16,867 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:17,048 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 [2022-03-20 17:46:17,049 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:17,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:17,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1536393353, now seen corresponding path program 5 times [2022-03-20 17:46:17,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:17,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [156002480] [2022-03-20 17:46:17,051 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:17,051 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:17,051 INFO L85 PathProgramCache]: Analyzing trace with hash 1536393353, now seen corresponding path program 6 times [2022-03-20 17:46:17,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:17,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309513505] [2022-03-20 17:46:17,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:17,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:17,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:17,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,177 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:17,177 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:17,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309513505] [2022-03-20 17:46:17,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309513505] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:17,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887508494] [2022-03-20 17:46:17,178 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 17:46:17,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:17,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:17,179 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) [2022-03-20 17:46:17,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 17:46:17,254 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 17:46:17,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:17,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 17:46:17,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:17,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:17,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:17,493 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:17,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887508494] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:17,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:17,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-20 17:46:17,494 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:17,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [156002480] [2022-03-20 17:46:17,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [156002480] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:17,494 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:17,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 17:46:17,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059376829] [2022-03-20 17:46:17,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:17,495 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 17:46:17,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:17,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 17:46:17,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2022-03-20 17:46:17,496 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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) [2022-03-20 17:46:17,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:17,621 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2022-03-20 17:46:17,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 17:46:17,623 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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 20 [2022-03-20 17:46:17,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:17,623 INFO L225 Difference]: With dead ends: 43 [2022-03-20 17:46:17,624 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 17:46:17,624 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2022-03-20 17:46:17,625 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:17,625 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 46 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:17,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 17:46:17,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-03-20 17:46:17,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 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) [2022-03-20 17:46:17,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-03-20 17:46:17,632 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2022-03-20 17:46:17,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:17,632 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-03-20 17:46:17,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 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) [2022-03-20 17:46:17,632 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-03-20 17:46:17,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 17:46:17,633 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:17,633 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:17,640 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:17,838 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 [2022-03-20 17:46:17,838 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:17,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:17,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1635265194, now seen corresponding path program 7 times [2022-03-20 17:46:17,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:17,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [359290621] [2022-03-20 17:46:17,840 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:17,840 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:17,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1635265194, now seen corresponding path program 8 times [2022-03-20 17:46:17,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:17,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072244561] [2022-03-20 17:46:17,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:17,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:17,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:17,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:17,997 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:17,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072244561] [2022-03-20 17:46:17,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072244561] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:17,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748562287] [2022-03-20 17:46:17,997 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 17:46:17,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:17,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:17,999 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) [2022-03-20 17:46:18,011 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 17:46:18,041 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 17:46:18,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:18,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 17:46:18,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:18,166 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:18,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:18,311 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:18,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748562287] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:18,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:18,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-03-20 17:46:18,313 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:18,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [359290621] [2022-03-20 17:46:18,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [359290621] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:18,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:18,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 17:46:18,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543752203] [2022-03-20 17:46:18,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:18,314 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 17:46:18,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:18,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 17:46:18,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2022-03-20 17:46:18,315 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 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) [2022-03-20 17:46:18,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:18,470 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-03-20 17:46:18,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 17:46:18,470 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 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 23 [2022-03-20 17:46:18,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:18,471 INFO L225 Difference]: With dead ends: 34 [2022-03-20 17:46:18,471 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 17:46:18,472 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2022-03-20 17:46:18,477 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:18,477 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 31 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 17:46:18,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 17:46:18,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2022-03-20 17:46:18,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 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) [2022-03-20 17:46:18,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-03-20 17:46:18,490 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2022-03-20 17:46:18,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:18,491 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-03-20 17:46:18,491 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 8 states have internal predecessors, (19), 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) [2022-03-20 17:46:18,491 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-03-20 17:46:18,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 17:46:18,493 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 17:46:18,493 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 17:46:18,523 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:18,713 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:18,713 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 17:46:18,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 17:46:18,714 INFO L85 PathProgramCache]: Analyzing trace with hash 778715369, now seen corresponding path program 9 times [2022-03-20 17:46:18,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:18,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [996869829] [2022-03-20 17:46:18,715 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-03-20 17:46:18,715 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 17:46:18,715 INFO L85 PathProgramCache]: Analyzing trace with hash 778715369, now seen corresponding path program 10 times [2022-03-20 17:46:18,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 17:46:18,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065298425] [2022-03-20 17:46:18,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 17:46:18,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 17:46:18,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:18,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 17:46:18,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 17:46:18,853 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:18,853 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 17:46:18,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065298425] [2022-03-20 17:46:18,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065298425] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 17:46:18,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076672899] [2022-03-20 17:46:18,854 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 17:46:18,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:18,854 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 17:46:18,855 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) [2022-03-20 17:46:18,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 17:46:18,906 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 17:46:18,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 17:46:18,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 17:46:18,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 17:46:19,040 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:19,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 17:46:19,150 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 17:46:19,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076672899] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 17:46:19,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 17:46:19,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-20 17:46:19,151 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 17:46:19,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [996869829] [2022-03-20 17:46:19,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [996869829] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 17:46:19,151 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 17:46:19,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 17:46:19,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283716421] [2022-03-20 17:46:19,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 17:46:19,152 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 17:46:19,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 17:46:19,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 17:46:19,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-03-20 17:46:19,153 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 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) [2022-03-20 17:46:19,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 17:46:19,268 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2022-03-20 17:46:19,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 17:46:19,269 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 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 26 [2022-03-20 17:46:19,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 17:46:19,269 INFO L225 Difference]: With dead ends: 39 [2022-03-20 17:46:19,269 INFO L226 Difference]: Without dead ends: 0 [2022-03-20 17:46:19,270 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2022-03-20 17:46:19,270 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 17:46:19,270 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 38 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 17:46:19,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-20 17:46:19,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-20 17:46:19,271 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) [2022-03-20 17:46:19,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-20 17:46:19,271 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 26 [2022-03-20 17:46:19,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 17:46:19,272 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-20 17:46:19,272 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 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) [2022-03-20 17:46:19,272 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-20 17:46:19,272 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-20 17:46:19,274 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 17:46:19,302 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 17:46:19,483 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 17:46:19,485 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-20 17:46:19,611 INFO L882 garLoopResultBuilder]: For program point reach_errorEXIT(line 3) no Hoare annotation was computed. [2022-03-20 17:46:19,611 INFO L882 garLoopResultBuilder]: For program point reach_errorENTRY(line 3) no Hoare annotation was computed. [2022-03-20 17:46:19,611 INFO L882 garLoopResultBuilder]: For program point reach_errorFINAL(line 3) no Hoare annotation was computed. [2022-03-20 17:46:19,611 INFO L885 garLoopResultBuilder]: At program point L30(line 30) the Hoare annotation is: true [2022-03-20 17:46:19,611 INFO L885 garLoopResultBuilder]: At program point mainENTRY(lines 14 34) the Hoare annotation is: true [2022-03-20 17:46:19,611 INFO L885 garLoopResultBuilder]: At program point mainEXIT(lines 14 34) the Hoare annotation is: true [2022-03-20 17:46:19,612 INFO L878 garLoopResultBuilder]: At program point L23(lines 23 24) the Hoare annotation is: (let ((.cse0 (div main_~len~0 4294967296))) (or (and (<= main_~len~0 3) (not (<= (+ .cse0 1) 0))) (let ((.cse1 (* .cse0 4294967296))) (and (<= main_~len~0 (+ .cse1 4)) (<= .cse0 0) (< (+ .cse1 3) main_~len~0))))) [2022-03-20 17:46:19,612 INFO L878 garLoopResultBuilder]: At program point L23-2(lines 23 24) the Hoare annotation is: (or (and (<= 3 main_~len~0) (<= main_~len~0 3)) (and (<= main_~len~0 2) (<= 2 main_~len~0)) (= main_~len~0 0) (and (<= 1 main_~len~0) (<= main_~len~0 1))) [2022-03-20 17:46:19,612 INFO L878 garLoopResultBuilder]: At program point L21-2(lines 21 29) the Hoare annotation is: (let ((.cse0 (div main_~len~0 4294967296))) (and (<= main_~len~0 (+ (* .cse0 4294967296) 4)) (<= .cse0 0) (not (<= (+ .cse0 1) 0)))) [2022-03-20 17:46:19,612 INFO L878 garLoopResultBuilder]: At program point L21-3(lines 21 29) the Hoare annotation is: (and (<= main_~len~0 4) (not (<= (+ (div main_~len~0 4294967296) 1) 0))) [2022-03-20 17:46:19,612 INFO L885 garLoopResultBuilder]: At program point mainFINAL(lines 14 34) the Hoare annotation is: true [2022-03-20 17:46:19,612 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,612 INFO L878 garLoopResultBuilder]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#NULL.base)| |#NULL.base|)) [2022-03-20 17:46:19,612 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,612 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point L-1(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 5 10) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point __VERIFIER_assertEXIT(lines 5 10) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L878 garLoopResultBuilder]: At program point L7(line 7) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2022-03-20 17:46:19,613 INFO L878 garLoopResultBuilder]: At program point L6(lines 6 8) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| 0) (not (= __VERIFIER_assert_~cond 0))) [2022-03-20 17:46:19,613 INFO L885 garLoopResultBuilder]: At program point L6-2(lines 5 10) the Hoare annotation is: true [2022-03-20 17:46:19,613 INFO L878 garLoopResultBuilder]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2022-03-20 17:46:19,616 INFO L719 BasicCegarLoop]: Path program histogram: [10, 2, 2] [2022-03-20 17:46:19,617 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-20 17:46:19,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.03 05:46:19 BoogieIcfgContainer [2022-03-20 17:46:19,632 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-20 17:46:19,633 INFO L158 Benchmark]: Toolchain (without parser) took 5373.88ms. Allocated memory was 181.4MB in the beginning and 231.7MB in the end (delta: 50.3MB). Free memory was 124.0MB in the beginning and 166.9MB in the end (delta: -43.0MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. [2022-03-20 17:46:19,633 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 181.4MB. Free memory is still 140.0MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-20 17:46:19,634 INFO L158 Benchmark]: CACSL2BoogieTranslator took 246.53ms. Allocated memory was 181.4MB in the beginning and 231.7MB in the end (delta: 50.3MB). Free memory was 123.7MB in the beginning and 205.9MB in the end (delta: -82.1MB). Peak memory consumption was 15.1MB. Max. memory is 8.0GB. [2022-03-20 17:46:19,634 INFO L158 Benchmark]: Boogie Preprocessor took 36.65ms. Allocated memory is still 231.7MB. Free memory was 205.9MB in the beginning and 204.8MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-20 17:46:19,634 INFO L158 Benchmark]: RCFGBuilder took 236.48ms. Allocated memory is still 231.7MB. Free memory was 204.8MB in the beginning and 194.3MB in the end (delta: 10.5MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. [2022-03-20 17:46:19,635 INFO L158 Benchmark]: TraceAbstraction took 4849.10ms. Allocated memory is still 231.7MB. Free memory was 193.8MB in the beginning and 166.9MB in the end (delta: 26.9MB). Peak memory consumption was 27.4MB. Max. memory is 8.0GB. [2022-03-20 17:46:19,636 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 181.4MB. Free memory is still 140.0MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 246.53ms. Allocated memory was 181.4MB in the beginning and 231.7MB in the end (delta: 50.3MB). Free memory was 123.7MB in the beginning and 205.9MB in the end (delta: -82.1MB). Peak memory consumption was 15.1MB. Max. memory is 8.0GB. * Boogie Preprocessor took 36.65ms. Allocated memory is still 231.7MB. Free memory was 205.9MB in the beginning and 204.8MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 236.48ms. Allocated memory is still 231.7MB. Free memory was 204.8MB in the beginning and 194.3MB in the end (delta: 10.5MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. * TraceAbstraction took 4849.10ms. Allocated memory is still 231.7MB. Free memory was 193.8MB in the beginning and 166.9MB in the end (delta: 26.9MB). Peak memory consumption was 27.4MB. 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: 7]: 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 5 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 4.8s, OverallIterations: 7, TraceHistogramMax: 5, PathProgramHistogramMax: 10, EmptinessCheckTime: 0.0s, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 144 SdHoareTripleChecker+Valid, 0.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 143 mSDsluCounter, 237 SdHoareTripleChecker+Invalid, 0.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 140 mSDsCounter, 63 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 390 IncrementalHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 63 mSolverCounterUnsat, 97 mSDtfsCounter, 390 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 284 GetRequests, 177 SyntacticMatches, 8 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred in iteration=6, InterpolantAutomatonStates: 51, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 6 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 21 LocationsWithAnnotation, 81 PreInvPairs, 125 NumberOfFragments, 131 HoareAnnotationTreeSize, 81 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 21 FomulaSimplificationsInter, 142 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: (len <= len / 4294967296 * 4294967296 + 4 && len / 4294967296 <= 0) && !(len / 4294967296 + 1 <= 0) - ProcedureContractResult [Line: 14]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 5]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 RESULT: Ultimate proved your program to be correct! [2022-03-20 17:46:19,676 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...