/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 20:18:17,706 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 20:18:17,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 20:18:17,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 20:18:17,786 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 20:18:17,786 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 20:18:17,787 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 20:18:17,788 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 20:18:17,796 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 20:18:17,796 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 20:18:17,798 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 20:18:17,798 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 20:18:17,799 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 20:18:17,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:18:17,799 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 20:18:17,800 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 20:18:17,800 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 20:18:17,800 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 20:18:17,800 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 20:18:17,800 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 20:18:17,800 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 20:18:18,014 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 20:18:18,038 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 20:18:18,040 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 20:18:18,041 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 20:18:18,042 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 20:18:18,042 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound20.c [2022-03-20 20:18:18,095 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6a00ccd4/b849d091d30f426386707043ca959e93/FLAGb21b2909a [2022-03-20 20:18:18,453 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 20:18:18,454 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound20.c [2022-03-20 20:18:18,466 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6a00ccd4/b849d091d30f426386707043ca959e93/FLAGb21b2909a [2022-03-20 20:18:18,481 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6a00ccd4/b849d091d30f426386707043ca959e93 [2022-03-20 20:18:18,483 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 20:18:18,484 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 20:18:18,487 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 20:18:18,487 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 20:18:18,490 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 20:18:18,490 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,491 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e767ea5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18, skipping insertion in model container [2022-03-20 20:18:18,491 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,497 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 20:18:18,514 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 20:18:18,655 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound20.c[525,538] [2022-03-20 20:18:18,691 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:18:18,697 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 20:18:18,706 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/dijkstra-u_valuebound20.c[525,538] [2022-03-20 20:18:18,730 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 20:18:18,740 INFO L208 MainTranslator]: Completed translation [2022-03-20 20:18:18,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18 WrapperNode [2022-03-20 20:18:18,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 20:18:18,742 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 20:18:18,742 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 20:18:18,742 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 20:18:18,750 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,751 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,765 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,768 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,771 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,772 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,773 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 20:18:18,774 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 20:18:18,774 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 20:18:18,774 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 20:18:18,774 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (1/1) ... [2022-03-20 20:18:18,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 20:18:18,788 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:18:18,797 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 20:18:18,817 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 20:18:18,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 20:18:18,834 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 20:18:18,834 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 20:18:18,834 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 20:18:18,835 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 20:18:18,835 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 20:18:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 20:18:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 20:18:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 20:18:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 20:18:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 20:18:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 20:18:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 20:18:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 20:18:18,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 20:18:18,838 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 20:18:18,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 20:18:18,838 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 20:18:18,838 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 20:18:18,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 20:18:18,888 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 20:18:18,889 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 20:18:19,065 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 20:18:19,072 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 20:18:19,072 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 20:18:19,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:18:19 BoogieIcfgContainer [2022-03-20 20:18:19,074 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 20:18:19,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 20:18:19,075 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 20:18:19,079 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 20:18:19,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 08:18:18" (1/3) ... [2022-03-20 20:18:19,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50a05c99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:18:19, skipping insertion in model container [2022-03-20 20:18:19,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 08:18:18" (2/3) ... [2022-03-20 20:18:19,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50a05c99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 08:18:19, skipping insertion in model container [2022-03-20 20:18:19,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 08:18:19" (3/3) ... [2022-03-20 20:18:19,085 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_valuebound20.c [2022-03-20 20:18:19,089 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 20:18:19,089 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 20:18:19,129 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 20:18:19,139 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 20:18:19,139 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 20:18:19,153 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 20:18:19,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 20:18:19,163 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:19,163 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:19,164 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:19,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:19,170 INFO L85 PathProgramCache]: Analyzing trace with hash 223850557, now seen corresponding path program 1 times [2022-03-20 20:18:19,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:19,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1611236191] [2022-03-20 20:18:19,185 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:19,186 INFO L85 PathProgramCache]: Analyzing trace with hash 223850557, now seen corresponding path program 2 times [2022-03-20 20:18:19,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:19,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853585029] [2022-03-20 20:18:19,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:19,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:19,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:19,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 20:18:19,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:19,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 20:18:19,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:19,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 20:18:19,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:18:19,384 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:18:19,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853585029] [2022-03-20 20:18:19,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853585029] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:19,385 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:19,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:18:19,387 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:18:19,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1611236191] [2022-03-20 20:18:19,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1611236191] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:19,387 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:19,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 20:18:19,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000588601] [2022-03-20 20:18:19,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:18:19,391 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 20:18:19,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:19,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 20:18:19,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 20:18:19,415 INFO L87 Difference]: Start difference. First operand has 38 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:18:21,485 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:23,574 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:23,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:18:23,629 INFO L93 Difference]: Finished difference Result 69 states and 113 transitions. [2022-03-20 20:18:23,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 20:18:23,631 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-20 20:18:23,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:18:23,636 INFO L225 Difference]: With dead ends: 69 [2022-03-20 20:18:23,636 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 20:18:23,638 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 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 20:18:23,642 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 14 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-03-20 20:18:23,644 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 43 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 9 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2022-03-20 20:18:23,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 20:18:23,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 20:18:23,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 20:18:23,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-03-20 20:18:23,683 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 23 [2022-03-20 20:18:23,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:18:23,684 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-03-20 20:18:23,684 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 20:18:23,684 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-03-20 20:18:23,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 20:18:23,685 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:23,686 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:23,686 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 20:18:23,687 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:23,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:23,687 INFO L85 PathProgramCache]: Analyzing trace with hash -563604624, now seen corresponding path program 1 times [2022-03-20 20:18:23,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:23,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1798135789] [2022-03-20 20:18:23,692 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:23,692 INFO L85 PathProgramCache]: Analyzing trace with hash -563604624, now seen corresponding path program 2 times [2022-03-20 20:18:23,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:23,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810938538] [2022-03-20 20:18:23,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:23,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:23,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 20:18:23,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:23,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 20:18:23,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:23,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 20:18:23,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 20:18:23,875 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:18:23,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810938538] [2022-03-20 20:18:23,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810938538] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:23,875 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:23,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 20:18:23,875 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:18:23,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1798135789] [2022-03-20 20:18:23,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1798135789] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:23,876 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:23,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 20:18:23,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499314581] [2022-03-20 20:18:23,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:18:23,876 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 20:18:23,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:23,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 20:18:23,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 20:18:23,877 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 20:18:26,256 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:28,259 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:30,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:32,270 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:34,786 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 20:18:37,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:18:37,561 INFO L93 Difference]: Finished difference Result 68 states and 98 transitions. [2022-03-20 20:18:37,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:18:37,563 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2022-03-20 20:18:37,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:18:37,564 INFO L225 Difference]: With dead ends: 68 [2022-03-20 20:18:37,564 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 20:18:37,565 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 20:18:37,565 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 34 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 48 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.6s IncrementalHoareTripleChecker+Time [2022-03-20 20:18:37,566 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 58 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 208 Invalid, 5 Unknown, 0 Unchecked, 13.6s Time] [2022-03-20 20:18:37,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 20:18:37,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-20 20:18:37,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 20 states have call successors, (20), 5 states have call predecessors, (20), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 20:18:37,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-03-20 20:18:37,583 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 24 [2022-03-20 20:18:37,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:18:37,584 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-03-20 20:18:37,584 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 20:18:37,584 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-03-20 20:18:37,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 20:18:37,586 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:37,586 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:37,586 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 20:18:37,586 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:37,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:37,587 INFO L85 PathProgramCache]: Analyzing trace with hash -5094773, now seen corresponding path program 1 times [2022-03-20 20:18:37,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:37,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [123058737] [2022-03-20 20:18:37,587 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:37,588 INFO L85 PathProgramCache]: Analyzing trace with hash -5094773, now seen corresponding path program 2 times [2022-03-20 20:18:37,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:37,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825820756] [2022-03-20 20:18:37,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:37,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:37,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:37,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 20:18:37,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:37,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 20:18:37,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:37,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 20:18:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 20:18:37,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 20:18:37,730 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:18:37,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825820756] [2022-03-20 20:18:37,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825820756] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:37,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:37,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 20:18:37,731 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:18:37,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [123058737] [2022-03-20 20:18:37,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [123058737] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:37,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:37,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 20:18:37,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854096598] [2022-03-20 20:18:37,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:18:37,732 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 20:18:37,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:37,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 20:18:37,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 20:18:37,733 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 20:18:41,153 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 20:18:43,961 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 20:18:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:18:44,156 INFO L93 Difference]: Finished difference Result 77 states and 112 transitions. [2022-03-20 20:18:44,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 20:18:44,157 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-03-20 20:18:44,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:18:44,158 INFO L225 Difference]: With dead ends: 77 [2022-03-20 20:18:44,158 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 20:18:44,158 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 20:18:44,159 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 37 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 82 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-03-20 20:18:44,159 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 48 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 226 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2022-03-20 20:18:44,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 20:18:44,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 63. [2022-03-20 20:18:44,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 27 states have call successors, (27), 6 states have call predecessors, (27), 5 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-20 20:18:44,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 88 transitions. [2022-03-20 20:18:44,176 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 88 transitions. Word has length 26 [2022-03-20 20:18:44,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:18:44,176 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 88 transitions. [2022-03-20 20:18:44,176 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 20:18:44,176 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 88 transitions. [2022-03-20 20:18:44,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 20:18:44,177 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:44,177 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:44,177 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 20:18:44,177 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:44,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:44,178 INFO L85 PathProgramCache]: Analyzing trace with hash -2000886032, now seen corresponding path program 1 times [2022-03-20 20:18:44,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:44,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1971172918] [2022-03-20 20:18:44,178 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:44,178 INFO L85 PathProgramCache]: Analyzing trace with hash -2000886032, now seen corresponding path program 2 times [2022-03-20 20:18:44,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:44,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582329198] [2022-03-20 20:18:44,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:44,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:44,196 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:18:44,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [496364916] [2022-03-20 20:18:44,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:18:44,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:18:44,197 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:18:44,198 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 20:18:44,204 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 20:18:44,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:18:44,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:18:44,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 20:18:44,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:18:44,471 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-03-20 20:18:44,471 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:18:44,471 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:18:44,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582329198] [2022-03-20 20:18:44,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:18:44,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496364916] [2022-03-20 20:18:44,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496364916] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:44,472 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:44,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:18:44,472 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:18:44,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1971172918] [2022-03-20 20:18:44,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1971172918] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:44,473 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:44,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:18:44,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547489646] [2022-03-20 20:18:44,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:18:44,473 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:18:44,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:44,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:18:44,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:18:44,474 INFO L87 Difference]: Start difference. First operand 63 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:18:45,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:18:45,090 INFO L93 Difference]: Finished difference Result 74 states and 97 transitions. [2022-03-20 20:18:45,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:18:45,091 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2022-03-20 20:18:45,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:18:45,093 INFO L225 Difference]: With dead ends: 74 [2022-03-20 20:18:45,093 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 20:18:45,094 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:18:45,094 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 20:18:45,094 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 160 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 20:18:45,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 20:18:45,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-20 20:18:45,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 21 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 20:18:45,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2022-03-20 20:18:45,104 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 34 [2022-03-20 20:18:45,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:18:45,104 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2022-03-20 20:18:45,104 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:18:45,104 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2022-03-20 20:18:45,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 20:18:45,105 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:45,105 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:45,110 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 20:18:45,309 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:18:45,309 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:45,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:45,310 INFO L85 PathProgramCache]: Analyzing trace with hash -965267381, now seen corresponding path program 1 times [2022-03-20 20:18:45,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:45,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1652718493] [2022-03-20 20:18:45,310 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:45,311 INFO L85 PathProgramCache]: Analyzing trace with hash -965267381, now seen corresponding path program 2 times [2022-03-20 20:18:45,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:45,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743441106] [2022-03-20 20:18:45,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:45,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:45,319 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:18:45,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1007321516] [2022-03-20 20:18:45,319 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:18:45,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:18:45,320 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:18:45,321 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 20:18:45,322 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 20:18:45,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 20:18:45,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 20:18:45,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 20:18:45,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 20:18:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 20:18:45,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 20:18:45,497 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 20:18:45,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743441106] [2022-03-20 20:18:45,498 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 20:18:45,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007321516] [2022-03-20 20:18:45,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007321516] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:45,504 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:45,504 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:18:45,504 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 20:18:45,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1652718493] [2022-03-20 20:18:45,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1652718493] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 20:18:45,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 20:18:45,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 20:18:45,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081237132] [2022-03-20 20:18:45,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 20:18:45,505 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 20:18:45,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:45,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 20:18:45,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 20:18:45,506 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:18:46,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 20:18:46,161 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-03-20 20:18:46,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 20:18:46,162 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2022-03-20 20:18:46,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 20:18:46,163 INFO L225 Difference]: With dead ends: 68 [2022-03-20 20:18:46,163 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 20:18:46,164 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 20:18:46,164 INFO L913 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 20:18:46,165 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 166 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 20:18:46,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 20:18:46,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-20 20:18:46,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 26 states have call successors, (26), 7 states have call predecessors, (26), 6 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 20:18:46,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 87 transitions. [2022-03-20 20:18:46,175 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 87 transitions. Word has length 36 [2022-03-20 20:18:46,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 20:18:46,175 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 87 transitions. [2022-03-20 20:18:46,176 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 20:18:46,176 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 87 transitions. [2022-03-20 20:18:46,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 20:18:46,177 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 20:18:46,177 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 20:18:46,184 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 20:18:46,391 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:18:46,391 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 20:18:46,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 20:18:46,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1670386034, now seen corresponding path program 1 times [2022-03-20 20:18:46,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 20:18:46,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1225150991] [2022-03-20 20:18:46,392 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 20:18:46,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1670386034, now seen corresponding path program 2 times [2022-03-20 20:18:46,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 20:18:46,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281966466] [2022-03-20 20:18:46,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 20:18:46,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 20:18:46,402 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 20:18:46,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1267464142] [2022-03-20 20:18:46,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 20:18:46,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 20:18:46,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 20:18:46,416 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 20:18:46,448 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process