/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/prod4br-ll_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 04:14:58,708 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 04:14:58,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 04:14:58,743 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 04:14:58,774 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 04:14:58,775 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 04:14:58,776 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 04:14:58,776 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 04:14:58,782 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 04:14:58,782 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 04:14:58,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 04:14:58,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 04:14:58,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 04:14:58,784 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 04:14:58,785 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 04:14:58,785 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 04:14:58,785 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 04:14:58,785 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 04:14:58,785 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 04:14:58,785 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 04:14:58,785 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 04:14:58,786 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 04:14:58,786 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 04:14:58,786 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 04:14:58,786 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 04:14:58,786 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 04:14:59,010 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 04:14:59,035 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 04:14:59,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 04:14:59,038 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 04:14:59,038 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 04:14:59,039 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c [2022-03-18 04:14:59,097 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f1839c39/541b63280d8e4192907ea759e87f5125/FLAG1b4904029 [2022-03-18 04:14:59,404 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 04:14:59,404 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c [2022-03-18 04:14:59,411 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f1839c39/541b63280d8e4192907ea759e87f5125/FLAG1b4904029 [2022-03-18 04:14:59,833 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2f1839c39/541b63280d8e4192907ea759e87f5125 [2022-03-18 04:14:59,834 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 04:14:59,835 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 04:14:59,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 04:14:59,843 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 04:14:59,845 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 04:14:59,846 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 04:14:59" (1/1) ... [2022-03-18 04:14:59,847 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f21682b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:14:59, skipping insertion in model container [2022-03-18 04:14:59,847 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 04:14:59" (1/1) ... [2022-03-18 04:14:59,851 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 04:14:59,872 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 04:15:00,056 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/prod4br-ll_valuebound5.c[524,537] [2022-03-18 04:15:00,084 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 04:15:00,089 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 04:15:00,096 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/prod4br-ll_valuebound5.c[524,537] [2022-03-18 04:15:00,105 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 04:15:00,114 INFO L208 MainTranslator]: Completed translation [2022-03-18 04:15:00,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00 WrapperNode [2022-03-18 04:15:00,115 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 04:15:00,116 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 04:15:00,116 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 04:15:00,116 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 04:15:00,128 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,129 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,135 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,135 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,146 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,149 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,150 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,152 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 04:15:00,152 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 04:15:00,152 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 04:15:00,152 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 04:15:00,158 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (1/1) ... [2022-03-18 04:15:00,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 04:15:00,173 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:00,200 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) [2022-03-18 04:15:00,202 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 [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 04:15:00,227 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 04:15:00,227 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 04:15:00,227 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 04:15:00,227 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 04:15:00,227 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 04:15:00,228 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 04:15:00,273 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 04:15:00,274 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 04:15:00,376 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 04:15:00,380 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 04:15:00,380 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 04:15:00,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 04:15:00 BoogieIcfgContainer [2022-03-18 04:15:00,381 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 04:15:00,382 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 04:15:00,382 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 04:15:00,396 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 04:15:00,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 04:14:59" (1/3) ... [2022-03-18 04:15:00,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe76e15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 04:15:00, skipping insertion in model container [2022-03-18 04:15:00,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 04:15:00" (2/3) ... [2022-03-18 04:15:00,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe76e15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 04:15:00, skipping insertion in model container [2022-03-18 04:15:00,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 04:15:00" (3/3) ... [2022-03-18 04:15:00,397 INFO L111 eAbstractionObserver]: Analyzing ICFG prod4br-ll_valuebound5.c [2022-03-18 04:15:00,401 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 04:15:00,401 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 04:15:00,428 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 04:15:00,433 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 [2022-03-18 04:15:00,433 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 04:15:00,441 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 04:15:00,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 04:15:00,447 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:00,458 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:00,459 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:00,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:00,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 1 times [2022-03-18 04:15:00,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:00,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1131179372] [2022-03-18 04:15:00,479 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:00,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 2 times [2022-03-18 04:15:00,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:00,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438460196] [2022-03-18 04:15:00,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:00,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:00,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 04:15:00,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 04:15:00,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 04:15:00,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 04:15:00,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 04:15:00,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-18 04:15:00,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 04:15:00,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-18 04:15:00,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 04:15:00,598 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:00,598 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:00,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438460196] [2022-03-18 04:15:00,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438460196] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:00,599 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:00,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 04:15:00,601 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:00,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1131179372] [2022-03-18 04:15:00,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1131179372] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:00,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:00,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 04:15:00,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427770353] [2022-03-18 04:15:00,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:00,606 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 04:15:00,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:00,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 04:15:00,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 04:15:00,629 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 04:15:00,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:00,714 INFO L93 Difference]: Finished difference Result 61 states and 88 transitions. [2022-03-18 04:15:00,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 04:15:00,718 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-03-18 04:15:00,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:00,725 INFO L225 Difference]: With dead ends: 61 [2022-03-18 04:15:00,725 INFO L226 Difference]: Without dead ends: 29 [2022-03-18 04:15:00,727 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 04:15:00,729 INFO L912 BasicCegarLoop]: 35 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:00,730 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 38 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 04:15:00,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-18 04:15:00,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-18 04:15:00,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 04:15:00,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-03-18 04:15:00,768 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 28 [2022-03-18 04:15:00,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:00,769 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-03-18 04:15:00,769 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, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 04:15:00,769 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-03-18 04:15:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 04:15:00,771 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:00,772 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:00,772 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 04:15:00,772 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:00,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:00,777 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 1 times [2022-03-18 04:15:00,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:00,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [371739086] [2022-03-18 04:15:00,781 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:00,781 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 2 times [2022-03-18 04:15:00,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:00,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797717684] [2022-03-18 04:15:00,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:00,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:00,814 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:00,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [146844348] [2022-03-18 04:15:00,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:00,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:00,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:00,820 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) [2022-03-18 04:15:00,878 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 04:15:00,898 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-18 04:15:00,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:00,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 04:15:00,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:01,072 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:01,073 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 04:15:01,073 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:01,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797717684] [2022-03-18 04:15:01,074 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:01,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146844348] [2022-03-18 04:15:01,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146844348] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:01,075 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:01,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 04:15:01,076 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:01,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [371739086] [2022-03-18 04:15:01,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [371739086] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:01,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:01,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 04:15:01,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150201195] [2022-03-18 04:15:01,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:01,085 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 04:15:01,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:01,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 04:15:01,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 04:15:01,086 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-18 04:15:01,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:01,167 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-03-18 04:15:01,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 04:15:01,167 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-03-18 04:15:01,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:01,168 INFO L225 Difference]: With dead ends: 43 [2022-03-18 04:15:01,168 INFO L226 Difference]: Without dead ends: 41 [2022-03-18 04:15:01,169 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 04:15:01,170 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 9 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:01,171 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 101 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 04:15:01,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-18 04:15:01,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-03-18 04:15:01,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 23 states have internal predecessors, (26), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-18 04:15:01,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-03-18 04:15:01,198 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-03-18 04:15:01,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:01,199 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-03-18 04:15:01,199 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-18 04:15:01,199 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-03-18 04:15:01,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-18 04:15:01,200 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:01,200 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:01,221 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:01,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:01,419 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:01,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:01,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 1 times [2022-03-18 04:15:01,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:01,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [539481439] [2022-03-18 04:15:01,420 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:01,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 2 times [2022-03-18 04:15:01,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:01,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435591476] [2022-03-18 04:15:01,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:01,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:01,433 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:01,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1956928412] [2022-03-18 04:15:01,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:01,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:01,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:01,448 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) [2022-03-18 04:15:01,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 04:15:01,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:01,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:01,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-18 04:15:01,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 04:15:01,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:02,097 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:02,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:02,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435591476] [2022-03-18 04:15:02,098 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:02,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956928412] [2022-03-18 04:15:02,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956928412] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:02,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:02,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 16 [2022-03-18 04:15:02,099 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:02,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [539481439] [2022-03-18 04:15:02,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [539481439] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:02,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:02,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-18 04:15:02,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423462960] [2022-03-18 04:15:02,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:02,099 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-18 04:15:02,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:02,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-18 04:15:02,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-03-18 04:15:02,100 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-18 04:15:04,217 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 [] [2022-03-18 04:15:07,078 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 [] [2022-03-18 04:15:07,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:07,144 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2022-03-18 04:15:07,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 04:15:07,145 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2022-03-18 04:15:07,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:07,145 INFO L225 Difference]: With dead ends: 47 [2022-03-18 04:15:07,145 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 04:15:07,146 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2022-03-18 04:15:07,147 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 40 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 16 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:07,147 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 148 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 209 Invalid, 2 Unknown, 0 Unchecked, 5.0s Time] [2022-03-18 04:15:07,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 04:15:07,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2022-03-18 04:15:07,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.24) internal successors, (31), 27 states have internal predecessors, (31), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 04:15:07,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-18 04:15:07,161 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 34 [2022-03-18 04:15:07,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:07,162 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-18 04:15:07,162 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-18 04:15:07,162 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-18 04:15:07,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 04:15:07,163 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:07,163 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:07,181 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-18 04:15:07,380 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,SelfDestructingSolverStorable2 [2022-03-18 04:15:07,381 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:07,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:07,381 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 1 times [2022-03-18 04:15:07,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:07,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [114570686] [2022-03-18 04:15:07,382 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:07,382 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 2 times [2022-03-18 04:15:07,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:07,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969095257] [2022-03-18 04:15:07,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:07,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:07,391 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:07,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [7601669] [2022-03-18 04:15:07,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:07,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:07,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:07,400 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) [2022-03-18 04:15:07,401 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 04:15:07,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:07,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:07,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-18 04:15:07,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:08,184 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:08,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:09,756 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 04:15:09,756 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:09,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969095257] [2022-03-18 04:15:09,756 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:09,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7601669] [2022-03-18 04:15:09,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7601669] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:09,757 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:09,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 21 [2022-03-18 04:15:09,757 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:09,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [114570686] [2022-03-18 04:15:09,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [114570686] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:09,757 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:09,757 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 04:15:09,757 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725881521] [2022-03-18 04:15:09,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:09,758 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 04:15:09,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:09,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 04:15:09,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2022-03-18 04:15:09,758 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-18 04:15:10,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:10,098 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2022-03-18 04:15:10,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 04:15:10,099 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 36 [2022-03-18 04:15:10,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:10,100 INFO L225 Difference]: With dead ends: 63 [2022-03-18 04:15:10,100 INFO L226 Difference]: Without dead ends: 55 [2022-03-18 04:15:10,100 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2022-03-18 04:15:10,101 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:10,101 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 136 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 04:15:10,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-18 04:15:10,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2022-03-18 04:15:10,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 33 states have internal predecessors, (38), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-18 04:15:10,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 58 transitions. [2022-03-18 04:15:10,110 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 58 transitions. Word has length 36 [2022-03-18 04:15:10,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:10,111 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 58 transitions. [2022-03-18 04:15:10,111 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-18 04:15:10,111 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 58 transitions. [2022-03-18 04:15:10,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 04:15:10,112 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:10,112 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:10,128 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:10,327 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:10,328 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:10,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:10,328 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 1 times [2022-03-18 04:15:10,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:10,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [347856316] [2022-03-18 04:15:10,328 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:10,329 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 2 times [2022-03-18 04:15:10,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:10,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956289837] [2022-03-18 04:15:10,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:10,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:10,338 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:10,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1884584497] [2022-03-18 04:15:10,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:10,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:10,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:10,356 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) [2022-03-18 04:15:10,366 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 04:15:10,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:10,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:10,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-18 04:15:10,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:10,616 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 04:15:10,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:10,960 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:10,960 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:10,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956289837] [2022-03-18 04:15:10,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:10,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884584497] [2022-03-18 04:15:10,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884584497] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:10,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:10,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2022-03-18 04:15:10,961 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:10,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [347856316] [2022-03-18 04:15:10,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [347856316] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:10,962 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:10,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 04:15:10,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108570818] [2022-03-18 04:15:10,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:10,962 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 04:15:10,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:10,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 04:15:10,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2022-03-18 04:15:10,963 INFO L87 Difference]: Start difference. First operand 49 states and 58 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 04:15:11,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:11,222 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2022-03-18 04:15:11,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 04:15:11,223 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2022-03-18 04:15:11,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:11,224 INFO L225 Difference]: With dead ends: 78 [2022-03-18 04:15:11,224 INFO L226 Difference]: Without dead ends: 64 [2022-03-18 04:15:11,224 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-03-18 04:15:11,225 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:11,225 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 129 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 04:15:11,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-18 04:15:11,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2022-03-18 04:15:11,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.275) internal successors, (51), 42 states have internal predecessors, (51), 12 states have call successors, (12), 8 states have call predecessors, (12), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-18 04:15:11,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 73 transitions. [2022-03-18 04:15:11,234 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 73 transitions. Word has length 37 [2022-03-18 04:15:11,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:11,234 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 73 transitions. [2022-03-18 04:15:11,234 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 04:15:11,234 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 73 transitions. [2022-03-18 04:15:11,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 04:15:11,235 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:11,235 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:11,254 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:11,443 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:11,444 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:11,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:11,444 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 1 times [2022-03-18 04:15:11,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:11,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [477639235] [2022-03-18 04:15:11,445 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:11,445 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 2 times [2022-03-18 04:15:11,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:11,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770906984] [2022-03-18 04:15:11,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:11,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:11,462 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:11,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [47059157] [2022-03-18 04:15:11,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:11,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:11,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:11,464 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) [2022-03-18 04:15:11,465 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 04:15:11,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:11,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:11,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-18 04:15:11,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:11,643 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-18 04:15:11,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:11,768 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-18 04:15:11,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770906984] [2022-03-18 04:15:11,768 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47059157] [2022-03-18 04:15:11,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47059157] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 04:15:11,769 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:15:11,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2022-03-18 04:15:11,769 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:11,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [477639235] [2022-03-18 04:15:11,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [477639235] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:11,769 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:11,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 04:15:11,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173096432] [2022-03-18 04:15:11,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:11,770 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 04:15:11,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:11,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 04:15:11,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-18 04:15:11,770 INFO L87 Difference]: Start difference. First operand 60 states and 73 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:11,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:11,957 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2022-03-18 04:15:11,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 04:15:11,957 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 39 [2022-03-18 04:15:11,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:11,958 INFO L225 Difference]: With dead ends: 66 [2022-03-18 04:15:11,958 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 04:15:11,958 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-03-18 04:15:11,959 INFO L912 BasicCegarLoop]: 37 mSDtfsCounter, 5 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:11,959 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 128 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 04:15:11,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 04:15:11,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-18 04:15:11,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 38 states have internal predecessors, (47), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 04:15:11,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-03-18 04:15:11,971 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 39 [2022-03-18 04:15:11,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:11,971 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-03-18 04:15:11,971 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:11,971 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-03-18 04:15:11,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 04:15:11,972 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:11,972 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:11,995 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:12,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:12,191 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:12,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:12,192 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 1 times [2022-03-18 04:15:12,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:12,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1135858789] [2022-03-18 04:15:12,192 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:12,192 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 2 times [2022-03-18 04:15:12,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:12,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205423423] [2022-03-18 04:15:12,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:12,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:12,214 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:12,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [351756525] [2022-03-18 04:15:12,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:12,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:12,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:12,219 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:12,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 04:15:12,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:12,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:12,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-18 04:15:12,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:12,502 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 04:15:12,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:12,796 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:12,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:12,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205423423] [2022-03-18 04:15:12,797 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:12,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351756525] [2022-03-18 04:15:12,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351756525] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:12,797 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:12,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2022-03-18 04:15:12,797 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:12,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1135858789] [2022-03-18 04:15:12,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1135858789] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:12,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:12,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 04:15:12,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099199604] [2022-03-18 04:15:12,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:12,798 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 04:15:12,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:12,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 04:15:12,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-03-18 04:15:12,798 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-18 04:15:13,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:13,020 INFO L93 Difference]: Finished difference Result 79 states and 100 transitions. [2022-03-18 04:15:13,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 04:15:13,021 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-03-18 04:15:13,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:13,022 INFO L225 Difference]: With dead ends: 79 [2022-03-18 04:15:13,022 INFO L226 Difference]: Without dead ends: 66 [2022-03-18 04:15:13,023 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-03-18 04:15:13,023 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:13,023 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 125 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 04:15:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-18 04:15:13,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-18 04:15:13,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 45 states have (on average 1.288888888888889) internal successors, (58), 46 states have internal predecessors, (58), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-18 04:15:13,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2022-03-18 04:15:13,038 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 38 [2022-03-18 04:15:13,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:13,038 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2022-03-18 04:15:13,038 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-18 04:15:13,038 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2022-03-18 04:15:13,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 04:15:13,039 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:13,054 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:13,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:13,263 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:13,264 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:13,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:13,265 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 1 times [2022-03-18 04:15:13,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:13,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [461673590] [2022-03-18 04:15:13,265 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:13,265 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 2 times [2022-03-18 04:15:13,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:13,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457098312] [2022-03-18 04:15:13,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:13,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:13,285 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:13,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1416477364] [2022-03-18 04:15:13,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:13,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:13,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:13,287 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:13,291 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 04:15:13,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:13,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:13,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-18 04:15:13,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:14,090 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:14,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:15,047 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:15:15,047 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:15,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457098312] [2022-03-18 04:15:15,048 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:15,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416477364] [2022-03-18 04:15:15,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416477364] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:15,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:15,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 22 [2022-03-18 04:15:15,048 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:15,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [461673590] [2022-03-18 04:15:15,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [461673590] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:15,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:15,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-18 04:15:15,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642639802] [2022-03-18 04:15:15,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:15,049 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 04:15:15,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:15,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 04:15:15,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2022-03-18 04:15:15,049 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-18 04:15:15,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:15,218 INFO L93 Difference]: Finished difference Result 86 states and 107 transitions. [2022-03-18 04:15:15,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-18 04:15:15,219 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 38 [2022-03-18 04:15:15,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:15,219 INFO L225 Difference]: With dead ends: 86 [2022-03-18 04:15:15,219 INFO L226 Difference]: Without dead ends: 73 [2022-03-18 04:15:15,220 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-03-18 04:15:15,220 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 36 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:15,220 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 158 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 04:15:15,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-18 04:15:15,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2022-03-18 04:15:15,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 52 states have internal predecessors, (65), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-18 04:15:15,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2022-03-18 04:15:15,231 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 38 [2022-03-18 04:15:15,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:15,231 INFO L478 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2022-03-18 04:15:15,231 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-18 04:15:15,231 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2022-03-18 04:15:15,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-18 04:15:15,232 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:15,232 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2022-03-18 04:15:15,237 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-18 04:15:15,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:15,436 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:15,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:15,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 1 times [2022-03-18 04:15:15,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:15,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1444872464] [2022-03-18 04:15:15,437 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:15,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 2 times [2022-03-18 04:15:15,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:15,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357142675] [2022-03-18 04:15:15,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:15,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:15,459 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:15,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1655361953] [2022-03-18 04:15:15,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:15,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:15,460 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:15,464 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:15,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-18 04:15:15,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:15,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:15,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 04:15:15,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:15,627 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-18 04:15:15,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:15,772 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:15:15,772 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:15,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357142675] [2022-03-18 04:15:15,772 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:15,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655361953] [2022-03-18 04:15:15,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655361953] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:15,772 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:15,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-18 04:15:15,774 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:15,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1444872464] [2022-03-18 04:15:15,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1444872464] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:15,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:15,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 04:15:15,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201775702] [2022-03-18 04:15:15,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:15,775 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 04:15:15,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:15,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 04:15:15,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-18 04:15:15,776 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:18,128 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 [] [2022-03-18 04:15:18,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:18,300 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2022-03-18 04:15:18,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 04:15:18,300 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2022-03-18 04:15:18,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:18,301 INFO L225 Difference]: With dead ends: 85 [2022-03-18 04:15:18,301 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 04:15:18,301 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-18 04:15:18,302 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:18,302 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 164 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2022-03-18 04:15:18,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 04:15:18,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2022-03-18 04:15:18,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 52 states have (on average 1.25) internal successors, (65), 54 states have internal predecessors, (65), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-18 04:15:18,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2022-03-18 04:15:18,311 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 43 [2022-03-18 04:15:18,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:18,311 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2022-03-18 04:15:18,311 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:18,312 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2022-03-18 04:15:18,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-18 04:15:18,312 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:18,312 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:18,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:18,529 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-18 04:15:18,529 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:18,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:18,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 3 times [2022-03-18 04:15:18,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:18,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [484291265] [2022-03-18 04:15:18,530 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:18,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 4 times [2022-03-18 04:15:18,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:18,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462970342] [2022-03-18 04:15:18,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:18,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:18,537 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:18,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [645084179] [2022-03-18 04:15:18,537 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:15:18,537 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:18,537 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:18,542 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:18,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-18 04:15:18,592 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:15:18,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:18,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-18 04:15:18,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:20,363 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:15:20,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:28,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:28,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462970342] [2022-03-18 04:15:28,395 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:28,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645084179] [2022-03-18 04:15:28,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645084179] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 04:15:28,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:15:28,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-18 04:15:28,396 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:28,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [484291265] [2022-03-18 04:15:28,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [484291265] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:28,396 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:28,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:15:28,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601680603] [2022-03-18 04:15:28,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:28,396 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:15:28,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:28,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:15:28,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2022-03-18 04:15:28,397 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:15:29,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:29,036 INFO L93 Difference]: Finished difference Result 104 states and 131 transitions. [2022-03-18 04:15:29,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 04:15:29,036 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 44 [2022-03-18 04:15:29,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:29,037 INFO L225 Difference]: With dead ends: 104 [2022-03-18 04:15:29,037 INFO L226 Difference]: Without dead ends: 88 [2022-03-18 04:15:29,037 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-03-18 04:15:29,038 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:29,038 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 164 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 04:15:29,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-18 04:15:29,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 85. [2022-03-18 04:15:29,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 62 states have internal predecessors, (75), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 04:15:29,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 101 transitions. [2022-03-18 04:15:29,049 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 101 transitions. Word has length 44 [2022-03-18 04:15:29,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:29,049 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 101 transitions. [2022-03-18 04:15:29,049 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:15:29,049 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 101 transitions. [2022-03-18 04:15:29,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-18 04:15:29,049 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:29,050 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1] [2022-03-18 04:15:29,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:29,250 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-18 04:15:29,250 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:29,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:29,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 1 times [2022-03-18 04:15:29,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:29,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [878113206] [2022-03-18 04:15:29,251 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:29,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 2 times [2022-03-18 04:15:29,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:29,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369850059] [2022-03-18 04:15:29,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:29,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:29,275 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:29,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [346426305] [2022-03-18 04:15:29,275 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:29,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:29,275 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:29,285 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:29,291 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-18 04:15:29,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:29,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:29,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 04:15:29,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:29,433 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-18 04:15:29,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:29,573 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:15:29,573 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:29,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369850059] [2022-03-18 04:15:29,573 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:29,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346426305] [2022-03-18 04:15:29,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346426305] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:29,573 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:29,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-18 04:15:29,573 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:29,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [878113206] [2022-03-18 04:15:29,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [878113206] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:29,574 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:29,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 04:15:29,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555818069] [2022-03-18 04:15:29,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:29,574 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 04:15:29,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:29,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 04:15:29,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-18 04:15:29,575 INFO L87 Difference]: Start difference. First operand 85 states and 101 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:31,842 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 [] [2022-03-18 04:15:32,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:32,254 INFO L93 Difference]: Finished difference Result 102 states and 123 transitions. [2022-03-18 04:15:32,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 04:15:32,254 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2022-03-18 04:15:32,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:32,255 INFO L225 Difference]: With dead ends: 102 [2022-03-18 04:15:32,255 INFO L226 Difference]: Without dead ends: 95 [2022-03-18 04:15:32,255 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-18 04:15:32,256 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:32,256 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 164 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2022-03-18 04:15:32,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-18 04:15:32,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 85. [2022-03-18 04:15:32,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.2131147540983607) internal successors, (74), 62 states have internal predecessors, (74), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 04:15:32,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 100 transitions. [2022-03-18 04:15:32,270 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 100 transitions. Word has length 44 [2022-03-18 04:15:32,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:32,270 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 100 transitions. [2022-03-18 04:15:32,270 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-18 04:15:32,270 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 100 transitions. [2022-03-18 04:15:32,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-18 04:15:32,272 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:32,272 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1] [2022-03-18 04:15:32,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:32,489 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-18 04:15:32,489 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:32,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:32,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 1 times [2022-03-18 04:15:32,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:32,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1644932843] [2022-03-18 04:15:32,491 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:32,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 2 times [2022-03-18 04:15:32,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:32,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116025739] [2022-03-18 04:15:32,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:32,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:32,534 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:32,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1383662319] [2022-03-18 04:15:32,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:32,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:32,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:32,535 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:32,536 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-18 04:15:32,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:32,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:32,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-18 04:15:32,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:33,065 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:15:33,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:33,232 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:15:33,232 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:33,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116025739] [2022-03-18 04:15:33,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:33,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383662319] [2022-03-18 04:15:33,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1383662319] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:33,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:33,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-18 04:15:33,233 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:33,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1644932843] [2022-03-18 04:15:33,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1644932843] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:33,233 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:33,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:15:33,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543130592] [2022-03-18 04:15:33,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:33,233 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:15:33,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:33,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:15:33,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-03-18 04:15:33,234 INFO L87 Difference]: Start difference. First operand 85 states and 100 transitions. Second operand has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:15:35,518 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 [] [2022-03-18 04:15:37,508 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:15:39,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:15:39,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:39,735 INFO L93 Difference]: Finished difference Result 94 states and 109 transitions. [2022-03-18 04:15:39,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 04:15:39,736 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 44 [2022-03-18 04:15:39,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:39,738 INFO L225 Difference]: With dead ends: 94 [2022-03-18 04:15:39,738 INFO L226 Difference]: Without dead ends: 87 [2022-03-18 04:15:39,739 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2022-03-18 04:15:39,740 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 11 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:39,740 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 162 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 232 Invalid, 2 Unknown, 0 Unchecked, 6.3s Time] [2022-03-18 04:15:39,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-18 04:15:39,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2022-03-18 04:15:39,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 62 states have internal predecessors, (73), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 04:15:39,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 99 transitions. [2022-03-18 04:15:39,755 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 99 transitions. Word has length 44 [2022-03-18 04:15:39,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:39,756 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 99 transitions. [2022-03-18 04:15:39,756 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:15:39,756 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 99 transitions. [2022-03-18 04:15:39,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-18 04:15:39,759 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:39,759 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:39,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:39,964 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-18 04:15:39,965 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:39,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:39,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1195555644, now seen corresponding path program 1 times [2022-03-18 04:15:39,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:39,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [980751535] [2022-03-18 04:15:39,965 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:39,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1195555644, now seen corresponding path program 2 times [2022-03-18 04:15:39,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:39,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692708239] [2022-03-18 04:15:39,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:39,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:39,972 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:39,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1432883031] [2022-03-18 04:15:39,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:15:39,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:39,972 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:39,973 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:39,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-18 04:15:40,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:15:40,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:40,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-18 04:15:40,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:15:41,098 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:15:41,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:15:41,530 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:15:41,530 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:15:41,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692708239] [2022-03-18 04:15:41,530 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:15:41,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432883031] [2022-03-18 04:15:41,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432883031] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:15:41,530 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:15:41,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 17 [2022-03-18 04:15:41,531 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:15:41,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [980751535] [2022-03-18 04:15:41,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [980751535] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:15:41,531 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:15:41,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 04:15:41,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758486363] [2022-03-18 04:15:41,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:15:41,531 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 04:15:41,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:41,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 04:15:41,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2022-03-18 04:15:41,532 INFO L87 Difference]: Start difference. First operand 85 states and 99 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:15:42,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:15:42,591 INFO L93 Difference]: Finished difference Result 113 states and 138 transitions. [2022-03-18 04:15:42,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 04:15:42,591 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 45 [2022-03-18 04:15:42,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:15:42,592 INFO L225 Difference]: With dead ends: 113 [2022-03-18 04:15:42,592 INFO L226 Difference]: Without dead ends: 97 [2022-03-18 04:15:42,592 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-03-18 04:15:42,593 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 54 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 04:15:42,593 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 161 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 04:15:42,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-18 04:15:42,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 86. [2022-03-18 04:15:42,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 63 states have internal predecessors, (75), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 04:15:42,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 101 transitions. [2022-03-18 04:15:42,605 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 101 transitions. Word has length 45 [2022-03-18 04:15:42,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:15:42,605 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 101 transitions. [2022-03-18 04:15:42,605 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:15:42,605 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 101 transitions. [2022-03-18 04:15:42,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-18 04:15:42,606 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:15:42,606 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:15:42,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-18 04:15:42,807 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-18 04:15:42,808 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:15:42,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:15:42,808 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 3 times [2022-03-18 04:15:42,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:15:42,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1471117404] [2022-03-18 04:15:42,808 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:15:42,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 4 times [2022-03-18 04:15:42,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:15:42,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320265495] [2022-03-18 04:15:42,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:15:42,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:15:42,816 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:15:42,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1744321270] [2022-03-18 04:15:42,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:15:42,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:15:42,816 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:15:42,817 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:15:42,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-18 04:15:42,875 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:15:42,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:15:42,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 04:15:42,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:16:02,022 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:16:02,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:16:09,887 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-18 04:16:25,997 WARN L232 SmtUtils]: Spent 7.14s on a formula simplification. DAG size of input: 60 DAG size of output: 55 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 04:16:36,743 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:16:36,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320265495] [2022-03-18 04:16:36,743 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:16:36,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744321270] [2022-03-18 04:16:36,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744321270] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 04:16:36,743 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:16:36,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-03-18 04:16:36,744 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:16:36,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1471117404] [2022-03-18 04:16:36,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1471117404] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:16:36,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:16:36,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 04:16:36,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337678159] [2022-03-18 04:16:36,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:16:36,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 04:16:36,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:36,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 04:16:36,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-03-18 04:16:36,745 INFO L87 Difference]: Start difference. First operand 86 states and 101 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-18 04:16:39,452 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:41,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:43,707 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:45,710 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:47,713 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:49,716 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:16:51,719 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 [] [2022-03-18 04:16:52,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:16:52,690 INFO L93 Difference]: Finished difference Result 120 states and 147 transitions. [2022-03-18 04:16:52,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 04:16:52,690 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 45 [2022-03-18 04:16:52,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:16:52,691 INFO L225 Difference]: With dead ends: 120 [2022-03-18 04:16:52,691 INFO L226 Difference]: Without dead ends: 102 [2022-03-18 04:16:52,691 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2022-03-18 04:16:52,691 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 34 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 11 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 14.8s IncrementalHoareTripleChecker+Time [2022-03-18 04:16:52,692 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 195 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 318 Invalid, 7 Unknown, 12 Unchecked, 14.8s Time] [2022-03-18 04:16:52,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-18 04:16:52,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 96. [2022-03-18 04:16:52,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 71 states have internal predecessors, (82), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 04:16:52,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2022-03-18 04:16:52,706 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 45 [2022-03-18 04:16:52,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:16:52,707 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2022-03-18 04:16:52,707 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-18 04:16:52,707 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2022-03-18 04:16:52,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 04:16:52,707 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:16:52,707 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:16:52,726 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-18 04:16:52,923 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-18 04:16:52,923 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:16:52,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:16:52,924 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 1 times [2022-03-18 04:16:52,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:52,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1478823637] [2022-03-18 04:16:52,924 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:16:52,924 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 2 times [2022-03-18 04:16:52,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:16:52,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432599326] [2022-03-18 04:16:52,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:16:52,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:16:52,932 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:16:52,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [807645347] [2022-03-18 04:16:52,933 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:16:52,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:16:52,933 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:16:52,946 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:16:52,947 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-18 04:16:52,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:16:52,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:16:52,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-18 04:16:52,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:16:54,585 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-18 04:16:54,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:16:55,228 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:16:55,229 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:16:55,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432599326] [2022-03-18 04:16:55,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:16:55,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807645347] [2022-03-18 04:16:55,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807645347] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:16:55,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:16:55,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-18 04:16:55,229 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:16:55,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1478823637] [2022-03-18 04:16:55,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1478823637] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:16:55,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:16:55,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:16:55,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143157043] [2022-03-18 04:16:55,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:16:55,230 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:16:55,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:55,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:16:55,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-03-18 04:16:55,230 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:16:55,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:16:55,513 INFO L93 Difference]: Finished difference Result 120 states and 143 transitions. [2022-03-18 04:16:55,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 04:16:55,513 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 46 [2022-03-18 04:16:55,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:16:55,515 INFO L225 Difference]: With dead ends: 120 [2022-03-18 04:16:55,515 INFO L226 Difference]: Without dead ends: 97 [2022-03-18 04:16:55,515 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2022-03-18 04:16:55,516 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:16:55,516 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 172 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 04:16:55,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-18 04:16:55,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2022-03-18 04:16:55,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 71 states have internal predecessors, (82), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 04:16:55,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2022-03-18 04:16:55,529 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 46 [2022-03-18 04:16:55,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:16:55,529 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2022-03-18 04:16:55,529 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:16:55,529 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2022-03-18 04:16:55,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 04:16:55,529 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:16:55,529 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:16:55,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-18 04:16:55,739 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:16:55,740 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:16:55,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:16:55,740 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 1 times [2022-03-18 04:16:55,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:55,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [445866306] [2022-03-18 04:16:55,740 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:16:55,741 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 2 times [2022-03-18 04:16:55,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:16:55,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131113087] [2022-03-18 04:16:55,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:16:55,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:16:55,746 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:16:55,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [466504576] [2022-03-18 04:16:55,746 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:16:55,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:16:55,747 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:16:55,751 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:16:55,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-18 04:16:55,788 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:16:55,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:16:55,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-18 04:16:55,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:16:56,579 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:16:56,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:16:56,735 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-18 04:16:56,736 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:16:56,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131113087] [2022-03-18 04:16:56,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:16:56,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466504576] [2022-03-18 04:16:56,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466504576] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:16:56,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:16:56,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 16 [2022-03-18 04:16:56,736 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:16:56,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [445866306] [2022-03-18 04:16:56,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [445866306] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:16:56,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:16:56,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 04:16:56,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422049466] [2022-03-18 04:16:56,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:16:56,737 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 04:16:56,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:56,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 04:16:56,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-03-18 04:16:56,737 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:16:57,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:16:57,809 INFO L93 Difference]: Finished difference Result 110 states and 130 transitions. [2022-03-18 04:16:57,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 04:16:57,809 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-18 04:16:57,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:16:57,810 INFO L225 Difference]: With dead ends: 110 [2022-03-18 04:16:57,810 INFO L226 Difference]: Without dead ends: 108 [2022-03-18 04:16:57,810 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2022-03-18 04:16:57,810 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 04:16:57,810 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 173 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 04:16:57,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-18 04:16:57,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2022-03-18 04:16:57,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 74 states have (on average 1.1756756756756757) internal successors, (87), 77 states have internal predecessors, (87), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 04:16:57,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 119 transitions. [2022-03-18 04:16:57,824 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 119 transitions. Word has length 46 [2022-03-18 04:16:57,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:16:57,825 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 119 transitions. [2022-03-18 04:16:57,825 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:16:57,825 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 119 transitions. [2022-03-18 04:16:57,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 04:16:57,825 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:16:57,825 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:16:57,846 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-18 04:16:58,026 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-18 04:16:58,026 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:16:58,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:16:58,026 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 3 times [2022-03-18 04:16:58,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:16:58,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1299982448] [2022-03-18 04:16:58,027 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:16:58,027 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 4 times [2022-03-18 04:16:58,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:16:58,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73307452] [2022-03-18 04:16:58,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:16:58,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:16:58,032 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:16:58,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [722782078] [2022-03-18 04:16:58,033 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:16:58,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:16:58,033 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:16:58,034 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:16:58,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-18 04:16:58,076 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:16:58,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:16:58,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-18 04:16:58,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:16:58,988 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-18 04:16:58,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:17:29,254 WARN L232 SmtUtils]: Spent 11.17s on a formula simplification. DAG size of input: 47 DAG size of output: 39 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 04:17:29,730 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-18 04:17:29,730 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:17:29,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73307452] [2022-03-18 04:17:29,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:17:29,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722782078] [2022-03-18 04:17:29,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722782078] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:17:29,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:17:29,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 20 [2022-03-18 04:17:29,731 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:17:29,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1299982448] [2022-03-18 04:17:29,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1299982448] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:17:29,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:17:29,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:17:29,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805775102] [2022-03-18 04:17:29,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:17:29,731 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:17:29,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:17:29,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:17:29,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=312, Unknown=1, NotChecked=0, Total=380 [2022-03-18 04:17:29,732 INFO L87 Difference]: Start difference. First operand 103 states and 119 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:17:29,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:17:29,985 INFO L93 Difference]: Finished difference Result 129 states and 154 transitions. [2022-03-18 04:17:29,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 04:17:29,985 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 46 [2022-03-18 04:17:29,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:17:29,986 INFO L225 Difference]: With dead ends: 129 [2022-03-18 04:17:29,986 INFO L226 Difference]: Without dead ends: 112 [2022-03-18 04:17:29,987 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=84, Invalid=421, Unknown=1, NotChecked=0, Total=506 [2022-03-18 04:17:29,987 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 46 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:17:29,987 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 171 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 04:17:29,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-03-18 04:17:30,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 100. [2022-03-18 04:17:30,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 71 states have (on average 1.1690140845070423) internal successors, (83), 75 states have internal predecessors, (83), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 04:17:30,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 115 transitions. [2022-03-18 04:17:30,010 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 115 transitions. Word has length 46 [2022-03-18 04:17:30,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:17:30,010 INFO L478 AbstractCegarLoop]: Abstraction has 100 states and 115 transitions. [2022-03-18 04:17:30,010 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-18 04:17:30,010 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 115 transitions. [2022-03-18 04:17:30,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 04:17:30,011 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:17:30,011 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:17:30,029 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-03-18 04:17:30,215 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 04:17:30,215 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:17:30,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:17:30,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 3 times [2022-03-18 04:17:30,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:17:30,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1775840120] [2022-03-18 04:17:30,216 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:17:30,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 4 times [2022-03-18 04:17:30,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:17:30,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560341799] [2022-03-18 04:17:30,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:17:30,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:17:30,221 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:17:30,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1967553393] [2022-03-18 04:17:30,222 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:17:30,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:17:30,222 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:17:30,223 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:17:30,224 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-18 04:17:30,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:17:30,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:17:30,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-18 04:17:30,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:17:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-18 04:17:34,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:17:50,770 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-18 04:17:50,770 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:17:50,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560341799] [2022-03-18 04:17:50,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:17:50,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967553393] [2022-03-18 04:17:50,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967553393] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:17:50,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:17:50,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 23 [2022-03-18 04:17:50,771 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:17:50,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1775840120] [2022-03-18 04:17:50,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1775840120] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:17:50,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:17:50,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:17:50,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839255272] [2022-03-18 04:17:50,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:17:50,771 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:17:50,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:17:50,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:17:50,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2022-03-18 04:17:50,772 INFO L87 Difference]: Start difference. First operand 100 states and 115 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:17:52,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:17:52,007 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-03-18 04:17:52,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 04:17:52,008 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-18 04:17:52,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:17:52,008 INFO L225 Difference]: With dead ends: 112 [2022-03-18 04:17:52,009 INFO L226 Difference]: Without dead ends: 110 [2022-03-18 04:17:52,009 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=113, Invalid=537, Unknown=0, NotChecked=0, Total=650 [2022-03-18 04:17:52,009 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 32 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-18 04:17:52,010 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 201 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-18 04:17:52,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-18 04:17:52,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 92. [2022-03-18 04:17:52,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.1846153846153846) internal successors, (77), 69 states have internal predecessors, (77), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 04:17:52,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2022-03-18 04:17:52,025 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 46 [2022-03-18 04:17:52,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:17:52,025 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2022-03-18 04:17:52,025 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-18 04:17:52,025 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2022-03-18 04:17:52,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-18 04:17:52,026 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:17:52,026 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:17:52,045 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-18 04:17:52,226 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 04:17:52,227 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:17:52,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:17:52,227 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 1 times [2022-03-18 04:17:52,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:17:52,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1957044531] [2022-03-18 04:17:52,228 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:17:52,228 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 2 times [2022-03-18 04:17:52,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:17:52,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492524156] [2022-03-18 04:17:52,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:17:52,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:17:52,233 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:17:52,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [392374805] [2022-03-18 04:17:52,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:17:52,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:17:52,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:17:52,234 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:17:52,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-18 04:17:52,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:17:52,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:17:52,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-18 04:17:52,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:17:53,298 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 04:17:53,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:17:53,489 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-18 04:17:53,489 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:17:53,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492524156] [2022-03-18 04:17:53,489 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:17:53,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392374805] [2022-03-18 04:17:53,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392374805] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:17:53,489 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:17:53,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 20 [2022-03-18 04:17:53,490 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:17:53,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1957044531] [2022-03-18 04:17:53,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1957044531] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:17:53,490 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:17:53,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-18 04:17:53,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742459519] [2022-03-18 04:17:53,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:17:53,490 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 04:17:53,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:17:53,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 04:17:53,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2022-03-18 04:17:53,491 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-18 04:17:54,643 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:17:57,140 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:17:59,197 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:18:00,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:00,185 INFO L93 Difference]: Finished difference Result 138 states and 171 transitions. [2022-03-18 04:18:00,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 04:18:00,185 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 52 [2022-03-18 04:18:00,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:00,186 INFO L225 Difference]: With dead ends: 138 [2022-03-18 04:18:00,186 INFO L226 Difference]: Without dead ends: 114 [2022-03-18 04:18:00,186 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2022-03-18 04:18:00,187 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 41 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 18 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:00,187 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 320 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 491 Invalid, 2 Unknown, 0 Unchecked, 6.6s Time] [2022-03-18 04:18:00,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-18 04:18:00,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2022-03-18 04:18:00,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 75 states have (on average 1.1866666666666668) internal successors, (89), 81 states have internal predecessors, (89), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (18), 13 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-18 04:18:00,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2022-03-18 04:18:00,215 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 52 [2022-03-18 04:18:00,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:00,215 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2022-03-18 04:18:00,216 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-18 04:18:00,216 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2022-03-18 04:18:00,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-18 04:18:00,216 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:18:00,216 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:18:00,233 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-18 04:18:00,432 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:00,432 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:18:00,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:18:00,433 INFO L85 PathProgramCache]: Analyzing trace with hash 967008175, now seen corresponding path program 5 times [2022-03-18 04:18:00,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:00,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1769015607] [2022-03-18 04:18:00,433 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:18:00,433 INFO L85 PathProgramCache]: Analyzing trace with hash 967008175, now seen corresponding path program 6 times [2022-03-18 04:18:00,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:18:00,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897391483] [2022-03-18 04:18:00,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:18:00,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:18:00,438 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:18:00,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1135375337] [2022-03-18 04:18:00,438 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 04:18:00,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:00,438 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:18:00,439 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:18:00,465 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-18 04:18:00,476 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-18 04:18:00,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:18:00,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-18 04:18:00,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:18:00,546 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-18 04:18:02,801 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-18 04:18:02,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:18:03,036 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-18 04:18:03,036 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:18:03,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897391483] [2022-03-18 04:18:03,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:18:03,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135375337] [2022-03-18 04:18:03,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135375337] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:18:03,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:18:03,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-18 04:18:03,038 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:18:03,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1769015607] [2022-03-18 04:18:03,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1769015607] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:18:03,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:18:03,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 04:18:03,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021201952] [2022-03-18 04:18:03,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:18:03,038 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 04:18:03,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:03,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 04:18:03,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=65, Unknown=1, NotChecked=0, Total=90 [2022-03-18 04:18:03,039 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-03-18 04:18:05,092 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:18:08,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-18 04:18:10,284 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 [] [2022-03-18 04:18:10,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:10,431 INFO L93 Difference]: Finished difference Result 119 states and 143 transitions. [2022-03-18 04:18:10,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 04:18:10,432 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 53 [2022-03-18 04:18:10,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:10,432 INFO L225 Difference]: With dead ends: 119 [2022-03-18 04:18:10,432 INFO L226 Difference]: Without dead ends: 115 [2022-03-18 04:18:10,433 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=37, Invalid=94, Unknown=1, NotChecked=0, Total=132 [2022-03-18 04:18:10,433 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 8 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:10,433 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 126 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 100 Invalid, 3 Unknown, 0 Unchecked, 7.3s Time] [2022-03-18 04:18:10,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-03-18 04:18:10,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 108. [2022-03-18 04:18:10,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 77 states have (on average 1.1688311688311688) internal successors, (90), 82 states have internal predecessors, (90), 20 states have call successors, (20), 12 states have call predecessors, (20), 10 states have return successors, (18), 13 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-18 04:18:10,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 128 transitions. [2022-03-18 04:18:10,454 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 128 transitions. Word has length 53 [2022-03-18 04:18:10,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:10,454 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 128 transitions. [2022-03-18 04:18:10,454 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-03-18 04:18:10,455 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 128 transitions. [2022-03-18 04:18:10,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-18 04:18:10,455 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:18:10,455 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:18:10,474 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-18 04:18:10,671 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:10,672 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:18:10,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:18:10,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1563197702, now seen corresponding path program 3 times [2022-03-18 04:18:10,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:10,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1677677819] [2022-03-18 04:18:10,672 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:18:10,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1563197702, now seen corresponding path program 4 times [2022-03-18 04:18:10,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:18:10,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004320038] [2022-03-18 04:18:10,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:18:10,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:18:10,678 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:18:10,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [274530736] [2022-03-18 04:18:10,678 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:18:10,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:10,678 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:18:10,679 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:18:10,680 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-18 04:18:10,724 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:18:10,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:18:10,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 04:18:10,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:18:11,160 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-18 04:18:11,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:18:11,271 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:18:11,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004320038] [2022-03-18 04:18:11,272 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:18:11,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274530736] [2022-03-18 04:18:11,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274530736] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 04:18:11,272 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:18:11,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-18 04:18:11,273 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:18:11,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1677677819] [2022-03-18 04:18:11,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1677677819] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:18:11,273 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:18:11,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 04:18:11,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166795080] [2022-03-18 04:18:11,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:18:11,273 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 04:18:11,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:11,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 04:18:11,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 04:18:11,274 INFO L87 Difference]: Start difference. First operand 108 states and 128 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-18 04:18:11,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:11,592 INFO L93 Difference]: Finished difference Result 168 states and 214 transitions. [2022-03-18 04:18:11,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-18 04:18:11,593 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 60 [2022-03-18 04:18:11,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:11,594 INFO L225 Difference]: With dead ends: 168 [2022-03-18 04:18:11,594 INFO L226 Difference]: Without dead ends: 147 [2022-03-18 04:18:11,594 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-03-18 04:18:11,595 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:11,595 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 227 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 320 Invalid, 0 Unknown, 104 Unchecked, 0.2s Time] [2022-03-18 04:18:11,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-03-18 04:18:11,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 127. [2022-03-18 04:18:11,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 97 states have internal predecessors, (110), 23 states have call successors, (23), 12 states have call predecessors, (23), 10 states have return successors, (21), 17 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-18 04:18:11,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 154 transitions. [2022-03-18 04:18:11,630 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 154 transitions. Word has length 60 [2022-03-18 04:18:11,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:11,632 INFO L478 AbstractCegarLoop]: Abstraction has 127 states and 154 transitions. [2022-03-18 04:18:11,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-18 04:18:11,632 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 154 transitions. [2022-03-18 04:18:11,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-18 04:18:11,633 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:18:11,633 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:18:11,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-18 04:18:11,850 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-18 04:18:11,851 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:18:11,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:18:11,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1755220788, now seen corresponding path program 1 times [2022-03-18 04:18:11,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:11,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1341072041] [2022-03-18 04:18:11,851 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:18:11,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1755220788, now seen corresponding path program 2 times [2022-03-18 04:18:11,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:18:11,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591876436] [2022-03-18 04:18:11,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:18:11,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:18:11,862 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:18:11,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1428700996] [2022-03-18 04:18:11,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 04:18:11,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:11,863 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:18:11,866 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:18:11,866 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-18 04:18:11,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 04:18:11,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:18:11,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 04:18:11,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:18:12,022 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-18 04:18:12,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:18:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-18 04:18:12,162 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:18:12,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591876436] [2022-03-18 04:18:12,162 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:18:12,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428700996] [2022-03-18 04:18:12,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428700996] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 04:18:12,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:18:12,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2022-03-18 04:18:12,162 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:18:12,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1341072041] [2022-03-18 04:18:12,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1341072041] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:18:12,163 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:18:12,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 04:18:12,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404113415] [2022-03-18 04:18:12,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:18:12,163 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 04:18:12,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:12,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 04:18:12,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-18 04:18:12,163 INFO L87 Difference]: Start difference. First operand 127 states and 154 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-18 04:18:12,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:12,246 INFO L93 Difference]: Finished difference Result 173 states and 219 transitions. [2022-03-18 04:18:12,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 04:18:12,247 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 61 [2022-03-18 04:18:12,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:12,249 INFO L225 Difference]: With dead ends: 173 [2022-03-18 04:18:12,249 INFO L226 Difference]: Without dead ends: 143 [2022-03-18 04:18:12,249 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-18 04:18:12,250 INFO L912 BasicCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:12,250 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 63 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 04:18:12,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-03-18 04:18:12,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2022-03-18 04:18:12,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.180952380952381) internal successors, (124), 107 states have internal predecessors, (124), 25 states have call successors, (25), 12 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-18 04:18:12,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2022-03-18 04:18:12,288 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 61 [2022-03-18 04:18:12,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:12,288 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2022-03-18 04:18:12,288 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-18 04:18:12,288 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2022-03-18 04:18:12,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-18 04:18:12,289 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:18:12,289 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:18:12,306 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-18 04:18:12,502 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-18 04:18:12,502 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:18:12,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:18:12,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1988072646, now seen corresponding path program 3 times [2022-03-18 04:18:12,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:12,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [940782067] [2022-03-18 04:18:12,503 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:18:12,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1988072646, now seen corresponding path program 4 times [2022-03-18 04:18:12,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:18:12,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076506135] [2022-03-18 04:18:12,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:18:12,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:18:12,510 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:18:12,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1706260949] [2022-03-18 04:18:12,510 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 04:18:12,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:12,510 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:18:12,511 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:18:12,512 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-18 04:18:12,544 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 04:18:12,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:18:12,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 04:18:12,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:18:13,185 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-18 04:18:13,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:18:13,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:18:13,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076506135] [2022-03-18 04:18:13,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:18:13,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706260949] [2022-03-18 04:18:13,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706260949] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 04:18:13,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-18 04:18:13,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-03-18 04:18:13,339 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:18:13,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [940782067] [2022-03-18 04:18:13,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [940782067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:18:13,339 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:18:13,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-18 04:18:13,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548784539] [2022-03-18 04:18:13,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:18:13,339 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-18 04:18:13,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:13,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-18 04:18:13,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2022-03-18 04:18:13,340 INFO L87 Difference]: Start difference. First operand 141 states and 172 transitions. Second operand has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-18 04:18:13,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:13,725 INFO L93 Difference]: Finished difference Result 153 states and 187 transitions. [2022-03-18 04:18:13,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-18 04:18:13,725 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 61 [2022-03-18 04:18:13,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:13,726 INFO L225 Difference]: With dead ends: 153 [2022-03-18 04:18:13,726 INFO L226 Difference]: Without dead ends: 148 [2022-03-18 04:18:13,726 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-03-18 04:18:13,726 INFO L912 BasicCegarLoop]: 28 mSDtfsCounter, 14 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:13,727 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 326 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 327 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2022-03-18 04:18:13,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-18 04:18:13,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-03-18 04:18:13,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.180952380952381) internal successors, (124), 107 states have internal predecessors, (124), 25 states have call successors, (25), 12 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-18 04:18:13,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2022-03-18 04:18:13,762 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 61 [2022-03-18 04:18:13,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:13,762 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2022-03-18 04:18:13,762 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-18 04:18:13,762 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2022-03-18 04:18:13,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-18 04:18:13,763 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 04:18:13,763 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 04:18:13,779 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-18 04:18:13,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:13,979 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 04:18:13,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 04:18:13,979 INFO L85 PathProgramCache]: Analyzing trace with hash 165486739, now seen corresponding path program 5 times [2022-03-18 04:18:13,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:13,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [51264314] [2022-03-18 04:18:13,980 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 04:18:13,980 INFO L85 PathProgramCache]: Analyzing trace with hash 165486739, now seen corresponding path program 6 times [2022-03-18 04:18:13,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 04:18:13,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347378924] [2022-03-18 04:18:13,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 04:18:13,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 04:18:13,984 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 04:18:13,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1577915297] [2022-03-18 04:18:13,985 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 04:18:13,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:13,985 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 04:18:13,991 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 04:18:14,020 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-18 04:18:14,072 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-18 04:18:14,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 04:18:14,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-18 04:18:14,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 04:18:14,199 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-03-18 04:18:14,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 04:18:14,355 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2022-03-18 04:18:14,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 04:18:14,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347378924] [2022-03-18 04:18:14,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 04:18:14,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577915297] [2022-03-18 04:18:14,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577915297] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 04:18:14,355 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 04:18:14,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-18 04:18:14,355 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 04:18:14,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [51264314] [2022-03-18 04:18:14,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [51264314] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 04:18:14,356 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 04:18:14,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 04:18:14,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140039303] [2022-03-18 04:18:14,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 04:18:14,356 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 04:18:14,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 04:18:14,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 04:18:14,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-18 04:18:14,356 INFO L87 Difference]: Start difference. First operand 141 states and 172 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2022-03-18 04:18:16,493 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 [] [2022-03-18 04:18:18,768 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 [] [2022-03-18 04:18:18,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 04:18:18,816 INFO L93 Difference]: Finished difference Result 141 states and 172 transitions. [2022-03-18 04:18:18,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 04:18:18,816 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) Word has length 62 [2022-03-18 04:18:18,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 04:18:18,816 INFO L225 Difference]: With dead ends: 141 [2022-03-18 04:18:18,816 INFO L226 Difference]: Without dead ends: 0 [2022-03-18 04:18:18,816 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-18 04:18:18,817 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-03-18 04:18:18,817 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 118 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2022-03-18 04:18:18,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-18 04:18:18,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-18 04:18:18,817 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) [2022-03-18 04:18:18,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-18 04:18:18,817 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2022-03-18 04:18:18,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 04:18:18,817 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-18 04:18:18,818 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2022-03-18 04:18:18,818 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-18 04:18:18,818 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-18 04:18:18,819 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-18 04:18:18,836 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-18 04:18:19,024 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 04:18:19,026 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.