/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/hard-ll_valuebound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 21:30:30,840 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 21:30:30,841 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 21:30:30,874 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 21:30:30,916 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 21:30:30,917 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 21:30:30,918 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 21:30:30,919 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 21:30:30,928 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 21:30:30,928 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 21:30:30,930 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 21:30:30,930 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 21:30:30,930 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 21:30:30,930 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 21:30:30,931 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 21:30:30,931 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 21:30:30,931 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 21:30:30,932 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 21:30:30,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 21:30:30,933 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 21:30:30,933 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 21:30:31,138 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 21:30:31,154 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 21:30:31,156 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 21:30:31,157 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 21:30:31,158 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 21:30:31,159 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound10.c [2022-03-20 21:30:31,222 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58d73e0c8/87b5d58629e545e6a599f2813a145b74/FLAGfd60eb76f [2022-03-20 21:30:31,594 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 21:30:31,599 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound10.c [2022-03-20 21:30:31,604 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58d73e0c8/87b5d58629e545e6a599f2813a145b74/FLAGfd60eb76f [2022-03-20 21:30:31,614 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/58d73e0c8/87b5d58629e545e6a599f2813a145b74 [2022-03-20 21:30:31,616 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 21:30:31,618 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 21:30:31,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 21:30:31,624 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 21:30:31,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 21:30:31,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,628 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57934253 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31, skipping insertion in model container [2022-03-20 21:30:31,629 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,634 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 21:30:31,646 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 21:30:31,780 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/hard-ll_valuebound10.c[538,551] [2022-03-20 21:30:31,793 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 21:30:31,799 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 21:30:31,806 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/hard-ll_valuebound10.c[538,551] [2022-03-20 21:30:31,812 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 21:30:31,821 INFO L208 MainTranslator]: Completed translation [2022-03-20 21:30:31,821 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31 WrapperNode [2022-03-20 21:30:31,821 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 21:30:31,822 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 21:30:31,822 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 21:30:31,822 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 21:30:31,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,834 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,840 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,841 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,853 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,858 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,863 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,864 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 21:30:31,865 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 21:30:31,865 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 21:30:31,865 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 21:30:31,867 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (1/1) ... [2022-03-20 21:30:31,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 21:30:31,887 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:31,900 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 21:30:31,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 21:30:31,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 21:30:31,942 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 21:30:31,942 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 21:30:31,942 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 21:30:31,943 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 21:30:31,943 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 21:30:31,943 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 21:30:31,943 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 21:30:31,943 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 21:30:31,945 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 21:30:31,945 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 21:30:31,945 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 21:30:31,945 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 21:30:31,946 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 21:30:31,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 21:30:31,948 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 21:30:31,948 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 21:30:31,949 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 21:30:31,949 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 21:30:31,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 21:30:31,998 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 21:30:31,999 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 21:30:32,113 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 21:30:32,118 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 21:30:32,118 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 21:30:32,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 09:30:32 BoogieIcfgContainer [2022-03-20 21:30:32,120 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 21:30:32,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 21:30:32,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 21:30:32,140 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 21:30:32,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 09:30:31" (1/3) ... [2022-03-20 21:30:32,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fbc50a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 09:30:32, skipping insertion in model container [2022-03-20 21:30:32,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 09:30:31" (2/3) ... [2022-03-20 21:30:32,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15fbc50a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 09:30:32, skipping insertion in model container [2022-03-20 21:30:32,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 09:30:32" (3/3) ... [2022-03-20 21:30:32,142 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound10.c [2022-03-20 21:30:32,146 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 21:30:32,146 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 21:30:32,194 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 21:30:32,200 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 21:30:32,200 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 21:30:32,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 21:30:32,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 21:30:32,240 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:32,240 INFO L499 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] [2022-03-20 21:30:32,241 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:32,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:32,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 1 times [2022-03-20 21:30:32,256 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:32,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [768196813] [2022-03-20 21:30:32,267 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:32,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 2 times [2022-03-20 21:30:32,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:32,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364699361] [2022-03-20 21:30:32,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:32,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:32,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:30:32,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:30:32,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:30:32,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:30:32,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,422 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:30:32,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:32,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364699361] [2022-03-20 21:30:32,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364699361] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:32,423 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:32,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 21:30:32,425 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:32,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [768196813] [2022-03-20 21:30:32,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [768196813] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:32,426 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:32,426 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 21:30:32,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582309608] [2022-03-20 21:30:32,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:32,430 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 21:30:32,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:32,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 21:30:32,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 21:30:32,454 INFO L87 Difference]: Start difference. First operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (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) [2022-03-20 21:30:32,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:32,587 INFO L93 Difference]: Finished difference Result 69 states and 110 transitions. [2022-03-20 21:30:32,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 21:30:32,589 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 [2022-03-20 21:30:32,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:32,601 INFO L225 Difference]: With dead ends: 69 [2022-03-20 21:30:32,602 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 21:30:32,605 INFO L912 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 [2022-03-20 21:30:32,609 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:32,611 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:32,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 21:30:32,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 21:30:32,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:30:32,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-03-20 21:30:32,660 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 28 [2022-03-20 21:30:32,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:32,660 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-03-20 21:30:32,661 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) [2022-03-20 21:30:32,661 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-03-20 21:30:32,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 21:30:32,663 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:32,663 INFO L499 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] [2022-03-20 21:30:32,663 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 21:30:32,664 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:32,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:32,666 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 1 times [2022-03-20 21:30:32,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:32,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [311956056] [2022-03-20 21:30:32,670 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:32,671 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 2 times [2022-03-20 21:30:32,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:32,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941873675] [2022-03-20 21:30:32,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:32,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:32,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:30:32,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:30:32,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:30:32,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:30:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:32,798 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:30:32,798 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:32,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941873675] [2022-03-20 21:30:32,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941873675] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:32,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:32,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:30:32,799 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:32,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [311956056] [2022-03-20 21:30:32,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [311956056] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:32,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:32,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:30:32,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000073881] [2022-03-20 21:30:32,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:32,801 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:30:32,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:32,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:30:32,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:30:32,802 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 21:30:32,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:32,995 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-03-20 21:30:32,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 21:30:32,995 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 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 [2022-03-20 21:30:32,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:32,998 INFO L225 Difference]: With dead ends: 46 [2022-03-20 21:30:32,998 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 21:30:32,998 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:30:33,001 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:33,002 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 48 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:33,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 21:30:33,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-03-20 21:30:33,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:30:33,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2022-03-20 21:30:33,023 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 28 [2022-03-20 21:30:33,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:33,023 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2022-03-20 21:30:33,024 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 21:30:33,024 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2022-03-20 21:30:33,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 21:30:33,024 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:33,025 INFO L499 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] [2022-03-20 21:30:33,025 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 21:30:33,025 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:33,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:33,026 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 1 times [2022-03-20 21:30:33,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:33,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [389607889] [2022-03-20 21:30:33,026 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:33,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 2 times [2022-03-20 21:30:33,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:33,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811998243] [2022-03-20 21:30:33,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:33,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:33,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 21:30:33,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 21:30:33,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 21:30:33,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 21:30:33,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-20 21:30:33,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 21:30:33,122 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 21:30:33,122 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:33,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811998243] [2022-03-20 21:30:33,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811998243] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:33,122 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:33,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:30:33,123 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:33,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [389607889] [2022-03-20 21:30:33,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [389607889] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:33,123 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:33,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:30:33,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870710103] [2022-03-20 21:30:33,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:33,124 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:30:33,124 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:33,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:30:33,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:30:33,125 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 21:30:33,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:33,316 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2022-03-20 21:30:33,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 21:30:33,317 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2022-03-20 21:30:33,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:33,318 INFO L225 Difference]: With dead ends: 50 [2022-03-20 21:30:33,318 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 21:30:33,318 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:30:33,319 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 33 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:33,320 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 48 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:33,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 21:30:33,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-20 21:30:33,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 21:30:33,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-20 21:30:33,329 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-03-20 21:30:33,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:33,330 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-20 21:30:33,330 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 21:30:33,330 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-20 21:30:33,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 21:30:33,331 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:33,331 INFO L499 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] [2022-03-20 21:30:33,331 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 21:30:33,331 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:33,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:33,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 1 times [2022-03-20 21:30:33,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:33,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2106189510] [2022-03-20 21:30:33,332 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:33,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 2 times [2022-03-20 21:30:33,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:33,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295825672] [2022-03-20 21:30:33,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:33,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:33,345 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:33,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [680773660] [2022-03-20 21:30:33,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:33,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:33,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:33,351 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:30:33,357 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 21:30:33,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:33,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:33,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 21:30:33,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:33,550 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 21:30:33,550 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 21:30:33,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:33,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295825672] [2022-03-20 21:30:33,551 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:33,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680773660] [2022-03-20 21:30:33,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680773660] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:33,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:33,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:30:33,552 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:33,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2106189510] [2022-03-20 21:30:33,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2106189510] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:33,552 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:33,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:30:33,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959785602] [2022-03-20 21:30:33,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:33,553 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:30:33,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:33,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:30:33,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 21:30:33,554 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-03-20 21:30:33,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:33,603 INFO L93 Difference]: Finished difference Result 69 states and 89 transitions. [2022-03-20 21:30:33,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:30:33,603 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 38 [2022-03-20 21:30:33,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:33,604 INFO L225 Difference]: With dead ends: 69 [2022-03-20 21:30:33,604 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 21:30:33,605 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:30:33,606 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 8 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:33,606 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 157 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:30:33,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 21:30:33,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 21:30:33,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 21:30:33,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2022-03-20 21:30:33,618 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 38 [2022-03-20 21:30:33,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:33,618 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2022-03-20 21:30:33,618 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2022-03-20 21:30:33,618 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2022-03-20 21:30:33,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 21:30:33,619 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:33,620 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:33,646 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-20 21:30:33,841 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:33,842 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:33,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:33,842 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 1 times [2022-03-20 21:30:33,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:33,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1782881759] [2022-03-20 21:30:33,843 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:33,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 2 times [2022-03-20 21:30:33,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:33,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399325614] [2022-03-20 21:30:33,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:33,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:33,878 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:33,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [832228248] [2022-03-20 21:30:33,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:33,878 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:33,878 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:33,880 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:30:33,881 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 21:30:33,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:33,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:33,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 21:30:33,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:34,237 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 21:30:34,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:30:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 21:30:34,406 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:34,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399325614] [2022-03-20 21:30:34,407 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:34,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832228248] [2022-03-20 21:30:34,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832228248] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 21:30:34,407 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:30:34,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-03-20 21:30:34,407 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:34,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1782881759] [2022-03-20 21:30:34,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1782881759] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:34,408 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:34,408 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:30:34,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246324776] [2022-03-20 21:30:34,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:34,408 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:30:34,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:34,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:30:34,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 21:30:34,409 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:30:34,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:34,460 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-03-20 21:30:34,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:30:34,460 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 45 [2022-03-20 21:30:34,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:34,461 INFO L225 Difference]: With dead ends: 68 [2022-03-20 21:30:34,461 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 21:30:34,462 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-20 21:30:34,462 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 12 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:34,463 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 178 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:30:34,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 21:30:34,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 21:30:34,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 38 states have internal predecessors, (43), 20 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 21:30:34,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2022-03-20 21:30:34,477 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 45 [2022-03-20 21:30:34,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:34,477 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2022-03-20 21:30:34,478 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:30:34,478 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2022-03-20 21:30:34,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 21:30:34,479 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:34,479 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:34,504 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 21:30:34,695 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:34,696 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:34,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:34,696 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 1 times [2022-03-20 21:30:34,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:34,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [109086182] [2022-03-20 21:30:34,697 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:34,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 2 times [2022-03-20 21:30:34,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:34,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032105508] [2022-03-20 21:30:34,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:34,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:34,713 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:34,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2001791589] [2022-03-20 21:30:34,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:34,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:34,714 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:34,718 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:30:34,719 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 21:30:34,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:34,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:34,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 21:30:34,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:34,976 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-03-20 21:30:34,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:30:35,127 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-03-20 21:30:35,127 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:35,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032105508] [2022-03-20 21:30:35,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:35,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001791589] [2022-03-20 21:30:35,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001791589] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 21:30:35,128 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:30:35,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2022-03-20 21:30:35,131 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:35,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [109086182] [2022-03-20 21:30:35,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [109086182] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:35,138 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:35,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:30:35,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630090281] [2022-03-20 21:30:35,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:35,139 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:30:35,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:35,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:30:35,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 21:30:35,140 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:30:35,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:35,224 INFO L93 Difference]: Finished difference Result 76 states and 95 transitions. [2022-03-20 21:30:35,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:30:35,225 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 55 [2022-03-20 21:30:35,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:35,226 INFO L225 Difference]: With dead ends: 76 [2022-03-20 21:30:35,226 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 21:30:35,226 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-20 21:30:35,227 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 8 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:35,227 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 141 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:35,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 21:30:35,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-03-20 21:30:35,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.175) internal successors, (47), 43 states have internal predecessors, (47), 22 states have call successors, (22), 9 states have call predecessors, (22), 8 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-20 21:30:35,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2022-03-20 21:30:35,242 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 55 [2022-03-20 21:30:35,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:35,242 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2022-03-20 21:30:35,242 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-20 21:30:35,243 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2022-03-20 21:30:35,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 21:30:35,243 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:35,243 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:35,269 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 21:30:35,456 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:35,457 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:35,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:35,457 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 1 times [2022-03-20 21:30:35,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:35,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1208960696] [2022-03-20 21:30:35,458 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:35,458 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 2 times [2022-03-20 21:30:35,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:35,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893219273] [2022-03-20 21:30:35,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:35,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:35,467 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:35,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [585404512] [2022-03-20 21:30:35,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:35,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:35,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:35,469 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:30:35,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 21:30:35,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:35,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:35,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 21:30:35,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:35,661 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-03-20 21:30:35,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 21:30:35,661 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:35,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893219273] [2022-03-20 21:30:35,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:35,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585404512] [2022-03-20 21:30:35,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585404512] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:35,662 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:35,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:30:35,662 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:35,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1208960696] [2022-03-20 21:30:35,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1208960696] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:35,662 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:35,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 21:30:35,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001468524] [2022-03-20 21:30:35,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:35,663 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 21:30:35,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:35,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 21:30:35,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 21:30:35,664 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-03-20 21:30:35,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:35,717 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2022-03-20 21:30:35,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 21:30:35,718 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2022-03-20 21:30:35,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:35,722 INFO L225 Difference]: With dead ends: 79 [2022-03-20 21:30:35,722 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 21:30:35,722 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:30:35,723 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:35,724 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 132 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 21:30:35,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 21:30:35,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-03-20 21:30:35,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 41 states have (on average 1.146341463414634) internal successors, (47), 44 states have internal predecessors, (47), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 21:30:35,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-03-20 21:30:35,747 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 56 [2022-03-20 21:30:35,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:35,747 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-03-20 21:30:35,747 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-03-20 21:30:35,748 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-03-20 21:30:35,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 21:30:35,754 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:35,754 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:35,781 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 21:30:35,977 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:35,977 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:35,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:35,978 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 1 times [2022-03-20 21:30:35,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:35,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [658452692] [2022-03-20 21:30:35,979 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:35,979 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 2 times [2022-03-20 21:30:35,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:35,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99847962] [2022-03-20 21:30:35,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:35,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:35,992 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:35,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [950341250] [2022-03-20 21:30:35,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:35,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:35,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:35,994 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 21:30:36,001 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 21:30:36,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:36,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:36,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 21:30:36,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:36,751 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-03-20 21:30:36,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:30:39,223 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-03-20 21:30:39,224 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:39,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99847962] [2022-03-20 21:30:39,224 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:39,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950341250] [2022-03-20 21:30:39,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950341250] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:30:39,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:30:39,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 21:30:39,225 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:39,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [658452692] [2022-03-20 21:30:39,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [658452692] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:39,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:39,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 21:30:39,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693016322] [2022-03-20 21:30:39,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:39,226 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 21:30:39,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:39,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 21:30:39,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:30:39,226 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:30:39,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:39,427 INFO L93 Difference]: Finished difference Result 135 states and 165 transitions. [2022-03-20 21:30:39,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 21:30:39,427 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2022-03-20 21:30:39,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:39,429 INFO L225 Difference]: With dead ends: 135 [2022-03-20 21:30:39,429 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 21:30:39,430 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-03-20 21:30:39,430 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 10 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:39,430 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 326 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:39,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 21:30:39,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-03-20 21:30:39,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 64 states have (on average 1.140625) internal successors, (73), 67 states have internal predecessors, (73), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 21:30:39,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2022-03-20 21:30:39,455 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 75 [2022-03-20 21:30:39,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:39,455 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2022-03-20 21:30:39,456 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:30:39,456 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2022-03-20 21:30:39,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 21:30:39,456 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:39,457 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:39,482 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 21:30:39,679 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:39,680 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:39,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:39,680 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 3 times [2022-03-20 21:30:39,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:39,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [533318536] [2022-03-20 21:30:39,681 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:39,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 4 times [2022-03-20 21:30:39,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:39,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958047395] [2022-03-20 21:30:39,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:39,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:39,693 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:39,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1796821476] [2022-03-20 21:30:39,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:30:39,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:39,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:39,695 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) [2022-03-20 21:30:39,696 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 21:30:39,746 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:30:39,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:39,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 21:30:39,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:40,037 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-03-20 21:30:40,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:30:42,129 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-03-20 21:30:42,130 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:42,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958047395] [2022-03-20 21:30:42,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:42,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796821476] [2022-03-20 21:30:42,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796821476] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:30:42,130 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:30:42,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2022-03-20 21:30:42,130 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:42,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [533318536] [2022-03-20 21:30:42,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [533318536] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:42,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:42,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 21:30:42,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37407507] [2022-03-20 21:30:42,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:42,131 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 21:30:42,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:42,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 21:30:42,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 21:30:42,132 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-03-20 21:30:42,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:42,290 INFO L93 Difference]: Finished difference Result 133 states and 159 transitions. [2022-03-20 21:30:42,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 21:30:42,290 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 80 [2022-03-20 21:30:42,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:42,293 INFO L225 Difference]: With dead ends: 133 [2022-03-20 21:30:42,293 INFO L226 Difference]: Without dead ends: 110 [2022-03-20 21:30:42,294 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:30:42,294 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 11 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:42,295 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 265 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:30:42,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-20 21:30:42,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2022-03-20 21:30:42,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 66 states have (on average 1.106060606060606) internal successors, (73), 70 states have internal predecessors, (73), 28 states have call successors, (28), 16 states have call predecessors, (28), 15 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 21:30:42,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2022-03-20 21:30:42,308 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 80 [2022-03-20 21:30:42,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:42,309 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2022-03-20 21:30:42,309 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-03-20 21:30:42,309 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2022-03-20 21:30:42,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 21:30:42,310 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:42,310 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:30:42,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 21:30:42,535 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:42,536 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:30:42,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:30:42,536 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 1 times [2022-03-20 21:30:42,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:42,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [130015259] [2022-03-20 21:30:42,537 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:30:42,537 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 2 times [2022-03-20 21:30:42,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:30:42,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332313251] [2022-03-20 21:30:42,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:30:42,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:30:42,546 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:30:42,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [119362172] [2022-03-20 21:30:42,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:30:42,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:30:42,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:30:42,549 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) [2022-03-20 21:30:42,550 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 21:30:42,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:30:42,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:30:42,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 21:30:42,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:30:43,748 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 21:30:43,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:30:58,640 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-03-20 21:30:58,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:30:58,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332313251] [2022-03-20 21:30:58,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:30:58,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119362172] [2022-03-20 21:30:58,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119362172] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:30:58,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:30:58,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-03-20 21:30:58,641 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:30:58,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [130015259] [2022-03-20 21:30:58,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [130015259] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:30:58,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:30:58,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 21:30:58,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879664240] [2022-03-20 21:30:58,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:30:58,642 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 21:30:58,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:30:58,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 21:30:58,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2022-03-20 21:30:58,643 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-03-20 21:30:59,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:30:59,964 INFO L93 Difference]: Finished difference Result 116 states and 131 transitions. [2022-03-20 21:30:59,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 21:30:59,965 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 86 [2022-03-20 21:30:59,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:30:59,966 INFO L225 Difference]: With dead ends: 116 [2022-03-20 21:30:59,966 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 21:30:59,966 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2022-03-20 21:30:59,967 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 17 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 21:30:59,967 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 342 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 21:30:59,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 21:30:59,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-03-20 21:30:59,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 55 states have internal predecessors, (58), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 21:30:59,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2022-03-20 21:30:59,978 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 86 [2022-03-20 21:30:59,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:30:59,979 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2022-03-20 21:30:59,979 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-03-20 21:30:59,979 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2022-03-20 21:30:59,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-03-20 21:30:59,980 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:30:59,980 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1] [2022-03-20 21:31:00,003 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 21:31:00,203 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:00,203 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:31:00,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:31:00,203 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 5 times [2022-03-20 21:31:00,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:31:00,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [117873423] [2022-03-20 21:31:00,204 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:31:00,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 6 times [2022-03-20 21:31:00,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:31:00,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472804549] [2022-03-20 21:31:00,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:31:00,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:31:00,223 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:31:00,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1358714318] [2022-03-20 21:31:00,223 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:31:00,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:31:00,223 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:31:00,227 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) [2022-03-20 21:31:00,229 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 21:31:00,278 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 21:31:00,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:31:00,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 21:31:00,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:31:15,162 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-03-20 21:31:15,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:31:58,984 WARN L232 SmtUtils]: Spent 24.91s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:33:03,175 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 45 proven. 19 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-03-20 21:33:03,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:33:03,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472804549] [2022-03-20 21:33:03,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:33:03,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358714318] [2022-03-20 21:33:03,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358714318] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:33:03,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:33:03,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2022-03-20 21:33:03,177 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:33:03,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [117873423] [2022-03-20 21:33:03,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [117873423] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:33:03,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:33:03,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 21:33:03,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325984118] [2022-03-20 21:33:03,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:33:03,178 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 21:33:03,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:33:03,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 21:33:03,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=162, Unknown=2, NotChecked=0, Total=210 [2022-03-20 21:33:03,178 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:33:05,220 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 21:33:09,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:33:09,096 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-03-20 21:33:09,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 21:33:09,096 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 92 [2022-03-20 21:33:09,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:33:09,097 INFO L225 Difference]: With dead ends: 112 [2022-03-20 21:33:09,097 INFO L226 Difference]: Without dead ends: 100 [2022-03-20 21:33:09,098 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=59, Invalid=210, Unknown=3, NotChecked=0, Total=272 [2022-03-20 21:33:09,098 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 25 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 24 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-03-20 21:33:09,099 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 258 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 211 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2022-03-20 21:33:09,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-20 21:33:09,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2022-03-20 21:33:09,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 59 states have (on average 1.11864406779661) internal successors, (66), 63 states have internal predecessors, (66), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-20 21:33:09,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 116 transitions. [2022-03-20 21:33:09,110 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 116 transitions. Word has length 92 [2022-03-20 21:33:09,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:33:09,110 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 116 transitions. [2022-03-20 21:33:09,110 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-03-20 21:33:09,111 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 116 transitions. [2022-03-20 21:33:09,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 21:33:09,111 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:33:09,111 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2022-03-20 21:33:09,134 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 21:33:09,327 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 21:33:09,327 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:33:09,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:33:09,328 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 7 times [2022-03-20 21:33:09,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:33:09,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2026622334] [2022-03-20 21:33:09,328 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:33:09,328 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 8 times [2022-03-20 21:33:09,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:33:09,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005252435] [2022-03-20 21:33:09,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:33:09,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:33:09,335 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:33:09,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1954852954] [2022-03-20 21:33:09,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:33:09,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:33:09,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:33:09,337 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) [2022-03-20 21:33:09,347 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 21:33:09,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:33:09,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:33:09,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 21:33:09,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:33:09,856 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-03-20 21:33:09,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:33:12,369 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-03-20 21:33:12,369 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:33:12,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005252435] [2022-03-20 21:33:12,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:33:12,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954852954] [2022-03-20 21:33:12,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954852954] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:33:12,370 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:33:12,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-03-20 21:33:12,370 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:33:12,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2026622334] [2022-03-20 21:33:12,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2026622334] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:33:12,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:33:12,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 21:33:12,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006480112] [2022-03-20 21:33:12,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:33:12,371 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 21:33:12,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:33:12,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 21:33:12,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-03-20 21:33:12,371 INFO L87 Difference]: Start difference. First operand 99 states and 116 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-03-20 21:33:12,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:33:12,757 INFO L93 Difference]: Finished difference Result 177 states and 223 transitions. [2022-03-20 21:33:12,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 21:33:12,757 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 97 [2022-03-20 21:33:12,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:33:12,759 INFO L225 Difference]: With dead ends: 177 [2022-03-20 21:33:12,759 INFO L226 Difference]: Without dead ends: 138 [2022-03-20 21:33:12,760 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-03-20 21:33:12,760 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 13 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 21:33:12,760 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 400 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 21:33:12,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-03-20 21:33:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-03-20 21:33:12,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 82 states have (on average 1.1219512195121952) internal successors, (92), 88 states have internal predecessors, (92), 39 states have call successors, (39), 17 states have call predecessors, (39), 16 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2022-03-20 21:33:12,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 167 transitions. [2022-03-20 21:33:12,778 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 167 transitions. Word has length 97 [2022-03-20 21:33:12,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:33:12,779 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 167 transitions. [2022-03-20 21:33:12,779 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-03-20 21:33:12,779 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 167 transitions. [2022-03-20 21:33:12,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 21:33:12,780 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:33:12,780 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:33:12,796 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 21:33:12,983 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:33:12,983 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:33:12,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:33:12,984 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 9 times [2022-03-20 21:33:12,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:33:12,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1291799039] [2022-03-20 21:33:12,984 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:33:12,984 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 10 times [2022-03-20 21:33:12,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:33:12,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743230776] [2022-03-20 21:33:12,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:33:12,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:33:12,992 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:33:12,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1293621149] [2022-03-20 21:33:12,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:33:12,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:33:12,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:33:12,994 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) [2022-03-20 21:33:13,002 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 21:33:13,053 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:33:13,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:33:13,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 21:33:13,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:33:14,308 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-03-20 21:33:14,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:33:29,242 WARN L232 SmtUtils]: Spent 5.11s on a formula simplification that was a NOOP. DAG size: 142 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:34:00,162 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-03-20 21:34:00,162 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:00,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743230776] [2022-03-20 21:34:00,162 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:00,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293621149] [2022-03-20 21:34:00,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293621149] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:34:00,163 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:34:00,163 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2022-03-20 21:34:00,163 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:00,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1291799039] [2022-03-20 21:34:00,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1291799039] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:00,164 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:00,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 21:34:00,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321793003] [2022-03-20 21:34:00,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:00,164 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 21:34:00,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:00,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 21:34:00,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2022-03-20 21:34:00,165 INFO L87 Difference]: Start difference. First operand 138 states and 167 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-03-20 21:34:01,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:01,564 INFO L93 Difference]: Finished difference Result 184 states and 208 transitions. [2022-03-20 21:34:01,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 21:34:01,564 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 105 [2022-03-20 21:34:01,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:01,565 INFO L225 Difference]: With dead ends: 184 [2022-03-20 21:34:01,565 INFO L226 Difference]: Without dead ends: 147 [2022-03-20 21:34:01,566 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2022-03-20 21:34:01,567 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 17 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:01,569 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 511 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 21:34:01,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-03-20 21:34:01,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-03-20 21:34:01,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 95 states have internal predecessors, (98), 36 states have call successors, (36), 21 states have call predecessors, (36), 20 states have return successors, (33), 30 states have call predecessors, (33), 33 states have call successors, (33) [2022-03-20 21:34:01,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 167 transitions. [2022-03-20 21:34:01,593 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 167 transitions. Word has length 105 [2022-03-20 21:34:01,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:01,594 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 167 transitions. [2022-03-20 21:34:01,594 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-03-20 21:34:01,594 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 167 transitions. [2022-03-20 21:34:01,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-03-20 21:34:01,597 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:01,597 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 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] [2022-03-20 21:34:01,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 21:34:01,811 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 21:34:01,811 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:01,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:01,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 11 times [2022-03-20 21:34:01,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:01,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1754032457] [2022-03-20 21:34:01,812 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:01,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 12 times [2022-03-20 21:34:01,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:01,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173373592] [2022-03-20 21:34:01,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:01,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:01,820 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:01,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1526601755] [2022-03-20 21:34:01,820 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:34:01,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:01,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:01,821 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) [2022-03-20 21:34:01,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 21:34:01,897 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 21:34:01,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:01,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 21:34:01,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:02,334 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 96 proven. 4 refuted. 0 times theorem prover too weak. 395 trivial. 0 not checked. [2022-03-20 21:34:02,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:34:02,869 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:02,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173373592] [2022-03-20 21:34:02,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:02,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526601755] [2022-03-20 21:34:02,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526601755] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 21:34:02,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:34:02,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-03-20 21:34:02,870 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:02,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1754032457] [2022-03-20 21:34:02,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1754032457] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:02,870 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:02,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 21:34:02,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600341589] [2022-03-20 21:34:02,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:02,871 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 21:34:02,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:02,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 21:34:02,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-03-20 21:34:02,872 INFO L87 Difference]: Start difference. First operand 147 states and 167 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-03-20 21:34:03,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:03,397 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2022-03-20 21:34:03,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 21:34:03,398 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 114 [2022-03-20 21:34:03,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:03,399 INFO L225 Difference]: With dead ends: 168 [2022-03-20 21:34:03,399 INFO L226 Difference]: Without dead ends: 156 [2022-03-20 21:34:03,399 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-03-20 21:34:03,400 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 20 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:03,400 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 288 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 215 Invalid, 0 Unknown, 39 Unchecked, 0.3s Time] [2022-03-20 21:34:03,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-03-20 21:34:03,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2022-03-20 21:34:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 95 states have (on average 1.0842105263157895) internal successors, (103), 100 states have internal predecessors, (103), 38 states have call successors, (38), 22 states have call predecessors, (38), 21 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-03-20 21:34:03,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 176 transitions. [2022-03-20 21:34:03,420 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 176 transitions. Word has length 114 [2022-03-20 21:34:03,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:03,420 INFO L478 AbstractCegarLoop]: Abstraction has 155 states and 176 transitions. [2022-03-20 21:34:03,420 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-03-20 21:34:03,421 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 176 transitions. [2022-03-20 21:34:03,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-03-20 21:34:03,422 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:03,422 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-03-20 21:34:03,447 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 21:34:03,639 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,SelfDestructingSolverStorable13 [2022-03-20 21:34:03,639 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:03,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:03,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 3 times [2022-03-20 21:34:03,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:03,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [971454566] [2022-03-20 21:34:03,640 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:03,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 4 times [2022-03-20 21:34:03,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:03,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155800094] [2022-03-20 21:34:03,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:03,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:03,648 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:03,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885524604] [2022-03-20 21:34:03,648 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:34:03,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:03,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:03,649 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) [2022-03-20 21:34:03,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 21:34:03,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:34:03,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:03,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 21:34:03,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:04,462 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 21:34:04,598 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 71 proven. 29 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2022-03-20 21:34:04,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:34:04,690 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 21:34:15,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:15,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155800094] [2022-03-20 21:34:15,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:15,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885524604] [2022-03-20 21:34:15,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885524604] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 21:34:15,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 21:34:15,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-20 21:34:15,865 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:15,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [971454566] [2022-03-20 21:34:15,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [971454566] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:15,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:15,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 21:34:15,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745991154] [2022-03-20 21:34:15,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:15,866 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 21:34:15,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:15,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 21:34:15,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=503, Unknown=0, NotChecked=0, Total=650 [2022-03-20 21:34:15,867 INFO L87 Difference]: Start difference. First operand 155 states and 176 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-03-20 21:34:17,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:17,032 INFO L93 Difference]: Finished difference Result 161 states and 181 transitions. [2022-03-20 21:34:17,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 21:34:17,032 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) Word has length 116 [2022-03-20 21:34:17,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:17,034 INFO L225 Difference]: With dead ends: 161 [2022-03-20 21:34:17,034 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 21:34:17,034 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 168 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=160, Invalid=596, Unknown=0, NotChecked=0, Total=756 [2022-03-20 21:34:17,035 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 15 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:17,035 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 438 Invalid, 450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 21:34:17,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 21:34:17,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-03-20 21:34:17,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 79 states have internal predecessors, (82), 31 states have call successors, (31), 18 states have call predecessors, (31), 17 states have return successors, (29), 26 states have call predecessors, (29), 29 states have call successors, (29) [2022-03-20 21:34:17,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2022-03-20 21:34:17,048 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 116 [2022-03-20 21:34:17,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:17,049 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2022-03-20 21:34:17,049 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-03-20 21:34:17,049 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2022-03-20 21:34:17,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-03-20 21:34:17,050 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:17,050 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 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] [2022-03-20 21:34:17,070 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-20 21:34:17,263 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,SelfDestructingSolverStorable14 [2022-03-20 21:34:17,263 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:17,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:17,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 5 times [2022-03-20 21:34:17,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:17,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1244296450] [2022-03-20 21:34:17,264 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:17,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 6 times [2022-03-20 21:34:17,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:17,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962344844] [2022-03-20 21:34:17,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:17,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:17,272 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:17,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2059295283] [2022-03-20 21:34:17,272 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:34:17,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:17,273 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:17,276 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) [2022-03-20 21:34:17,277 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 21:34:17,341 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 21:34:17,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:17,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 21:34:17,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:17,635 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-03-20 21:34:17,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:34:17,871 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2022-03-20 21:34:17,872 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:34:17,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962344844] [2022-03-20 21:34:17,872 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:34:17,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059295283] [2022-03-20 21:34:17,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059295283] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:34:17,872 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:34:17,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2022-03-20 21:34:17,872 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:34:17,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1244296450] [2022-03-20 21:34:17,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1244296450] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:34:17,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:34:17,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 21:34:17,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980127923] [2022-03-20 21:34:17,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:34:17,873 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 21:34:17,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:17,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 21:34:17,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:34:17,874 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-03-20 21:34:17,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:34:17,959 INFO L93 Difference]: Finished difference Result 150 states and 178 transitions. [2022-03-20 21:34:17,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 21:34:17,960 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 120 [2022-03-20 21:34:17,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:34:17,961 INFO L225 Difference]: With dead ends: 150 [2022-03-20 21:34:17,961 INFO L226 Difference]: Without dead ends: 137 [2022-03-20 21:34:17,961 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 230 SyntacticMatches, 5 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-03-20 21:34:17,962 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 20 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 21:34:17,962 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 112 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 21:34:17,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-03-20 21:34:17,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2022-03-20 21:34:17,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 83 states have (on average 1.108433734939759) internal successors, (92), 87 states have internal predecessors, (92), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (34), 31 states have call predecessors, (34), 34 states have call successors, (34) [2022-03-20 21:34:17,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 162 transitions. [2022-03-20 21:34:17,978 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 162 transitions. Word has length 120 [2022-03-20 21:34:17,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:34:17,979 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 162 transitions. [2022-03-20 21:34:17,979 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-03-20 21:34:17,979 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 162 transitions. [2022-03-20 21:34:17,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-03-20 21:34:17,980 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:34:17,980 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 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, 1] [2022-03-20 21:34:18,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 21:34:18,203 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,SelfDestructingSolverStorable15 [2022-03-20 21:34:18,204 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:34:18,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:34:18,204 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 13 times [2022-03-20 21:34:18,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:34:18,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [914333950] [2022-03-20 21:34:18,205 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:34:18,205 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 14 times [2022-03-20 21:34:18,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:34:18,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14335798] [2022-03-20 21:34:18,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:34:18,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:34:18,215 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:34:18,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [645149744] [2022-03-20 21:34:18,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 21:34:18,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:34:18,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:34:18,217 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) [2022-03-20 21:34:18,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 21:34:18,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 21:34:18,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:34:18,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-20 21:34:18,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:34:19,322 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 32 proven. 45 refuted. 0 times theorem prover too weak. 486 trivial. 0 not checked. [2022-03-20 21:34:19,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:05,378 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-03-20 21:35:05,378 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:05,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14335798] [2022-03-20 21:35:05,379 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:05,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645149744] [2022-03-20 21:35:05,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645149744] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:35:05,379 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:35:05,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 25 [2022-03-20 21:35:05,379 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:05,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [914333950] [2022-03-20 21:35:05,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [914333950] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:05,380 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:05,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 21:35:05,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433072516] [2022-03-20 21:35:05,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:05,380 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 21:35:05,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:05,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 21:35:05,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2022-03-20 21:35:05,381 INFO L87 Difference]: Start difference. First operand 137 states and 162 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) [2022-03-20 21:35:06,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:06,306 INFO L93 Difference]: Finished difference Result 241 states and 293 transitions. [2022-03-20 21:35:06,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 21:35:06,306 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) Word has length 122 [2022-03-20 21:35:06,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:06,308 INFO L225 Difference]: With dead ends: 241 [2022-03-20 21:35:06,308 INFO L226 Difference]: Without dead ends: 195 [2022-03-20 21:35:06,308 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=136, Invalid=566, Unknown=0, NotChecked=0, Total=702 [2022-03-20 21:35:06,309 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 30 mSDsluCounter, 464 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:06,309 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 519 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 21:35:06,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-03-20 21:35:06,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 192. [2022-03-20 21:35:06,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 118 states have (on average 1.1101694915254237) internal successors, (131), 123 states have internal predecessors, (131), 49 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2022-03-20 21:35:06,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 227 transitions. [2022-03-20 21:35:06,330 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 227 transitions. Word has length 122 [2022-03-20 21:35:06,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:06,331 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 227 transitions. [2022-03-20 21:35:06,331 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 8 states have call successors, (20) [2022-03-20 21:35:06,331 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 227 transitions. [2022-03-20 21:35:06,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-03-20 21:35:06,332 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:06,332 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:35:06,358 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 21:35:06,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:06,556 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:06,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:06,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 15 times [2022-03-20 21:35:06,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:06,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1180845067] [2022-03-20 21:35:06,556 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:06,557 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 16 times [2022-03-20 21:35:06,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:06,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33369252] [2022-03-20 21:35:06,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:06,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:06,563 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:06,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [760252124] [2022-03-20 21:35:06,564 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 21:35:06,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:06,564 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:06,565 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) [2022-03-20 21:35:06,565 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 21:35:06,617 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 21:35:06,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:06,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 21:35:06,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:35:07,344 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 47 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2022-03-20 21:35:07,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:35:27,427 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-03-20 21:35:27,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 21:35:27,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33369252] [2022-03-20 21:35:27,427 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 21:35:27,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760252124] [2022-03-20 21:35:27,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760252124] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 21:35:27,428 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 21:35:27,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 25 [2022-03-20 21:35:27,428 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 21:35:27,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1180845067] [2022-03-20 21:35:27,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1180845067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 21:35:27,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 21:35:27,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 21:35:27,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640079872] [2022-03-20 21:35:27,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 21:35:27,428 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 21:35:27,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:27,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 21:35:27,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2022-03-20 21:35:27,429 INFO L87 Difference]: Start difference. First operand 192 states and 227 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 9 states have call predecessors, (21), 9 states have call successors, (21) [2022-03-20 21:35:28,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 21:35:28,403 INFO L93 Difference]: Finished difference Result 238 states and 285 transitions. [2022-03-20 21:35:28,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 21:35:28,404 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 9 states have call predecessors, (21), 9 states have call successors, (21) Word has length 127 [2022-03-20 21:35:28,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 21:35:28,405 INFO L225 Difference]: With dead ends: 238 [2022-03-20 21:35:28,405 INFO L226 Difference]: Without dead ends: 209 [2022-03-20 21:35:28,406 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=255, Invalid=1005, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 21:35:28,406 INFO L913 BasicCegarLoop]: 68 mSDtfsCounter, 33 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 699 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 21:35:28,407 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 699 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 21:35:28,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-03-20 21:35:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2022-03-20 21:35:28,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 128 states have (on average 1.1015625) internal successors, (141), 135 states have internal predecessors, (141), 52 states have call successors, (52), 27 states have call predecessors, (52), 26 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-03-20 21:35:28,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 242 transitions. [2022-03-20 21:35:28,434 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 242 transitions. Word has length 127 [2022-03-20 21:35:28,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 21:35:28,435 INFO L478 AbstractCegarLoop]: Abstraction has 207 states and 242 transitions. [2022-03-20 21:35:28,435 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 9 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 9 states have call predecessors, (21), 9 states have call successors, (21) [2022-03-20 21:35:28,435 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 242 transitions. [2022-03-20 21:35:28,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-03-20 21:35:28,436 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 21:35:28,436 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 21:35:28,463 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 21:35:28,650 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,SelfDestructingSolverStorable17 [2022-03-20 21:35:28,650 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 21:35:28,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 21:35:28,651 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 17 times [2022-03-20 21:35:28,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 21:35:28,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [270552899] [2022-03-20 21:35:28,651 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 21:35:28,651 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 18 times [2022-03-20 21:35:28,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 21:35:28,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772532852] [2022-03-20 21:35:28,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 21:35:28,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 21:35:28,658 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 21:35:28,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1111392467] [2022-03-20 21:35:28,659 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 21:35:28,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 21:35:28,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 21:35:28,660 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) [2022-03-20 21:35:28,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 21:35:28,848 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-03-20 21:35:28,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 21:35:28,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 64 conjunts are in the unsatisfiable core [2022-03-20 21:35:28,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 21:36:08,743 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 134 proven. 50 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2022-03-20 21:36:08,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 21:36:51,142 WARN L232 SmtUtils]: Spent 25.06s on a formula simplification that was a NOOP. DAG size: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:38:02,194 WARN L232 SmtUtils]: Spent 19.28s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:39:21,842 WARN L232 SmtUtils]: Spent 46.77s on a formula simplification that was a NOOP. DAG size: 133 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 21:42:25,223 WARN L232 SmtUtils]: Spent 53.16s on a formula simplification that was a NOOP. DAG size: 134 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)