java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-crafted/zero_sum2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:40:58,902 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:40:58,904 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:40:58,921 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:40:58,922 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:40:58,924 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:40:58,925 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:40:58,934 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:40:58,938 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:40:58,940 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:40:58,942 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:40:58,944 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:40:58,944 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:40:58,946 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:40:58,948 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:40:58,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:40:58,950 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:40:58,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:40:58,953 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:40:58,958 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:40:58,962 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:40:58,964 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:40:58,967 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:40:58,968 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:40:58,970 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:40:58,974 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:40:58,975 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:40:58,976 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:40:58,976 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:40:58,978 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:40:58,978 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:40:58,978 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:40:58,979 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:40:58,979 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:40:58,980 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:40:58,981 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:40:58,982 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:40:58,999 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:40:58,999 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:40:59,000 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:40:59,001 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:40:59,001 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:40:59,001 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:40:59,001 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:40:59,001 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:40:59,002 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:40:59,003 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:40:59,003 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:40:59,003 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:40:59,003 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:40:59,003 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:40:59,004 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:40:59,004 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:40:59,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:40:59,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:40:59,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:40:59,005 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:40:59,005 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:40:59,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:40:59,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:40:59,005 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:40:59,266 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:40:59,277 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:40:59,281 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:40:59,282 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:40:59,283 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:40:59,283 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum2.c [2019-10-14 21:40:59,341 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54aba6024/58fc2d92099745be9f598600e18e73a6/FLAG1e726a128 [2019-10-14 21:40:59,774 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:40:59,775 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum2.c [2019-10-14 21:40:59,781 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54aba6024/58fc2d92099745be9f598600e18e73a6/FLAG1e726a128 [2019-10-14 21:41:00,168 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54aba6024/58fc2d92099745be9f598600e18e73a6 [2019-10-14 21:41:00,179 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:41:00,181 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:41:00,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:41:00,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:41:00,185 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:41:00,186 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,189 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3534b1cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00, skipping insertion in model container [2019-10-14 21:41:00,189 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,196 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:41:00,217 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:41:00,395 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:41:00,407 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:41:00,431 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:41:00,539 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:41:00,540 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00 WrapperNode [2019-10-14 21:41:00,540 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:41:00,541 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:41:00,541 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:41:00,541 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:41:00,552 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,560 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,560 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,567 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,574 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,575 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... [2019-10-14 21:41:00,577 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:41:00,577 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:41:00,578 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:41:00,578 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:41:00,579 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:41:00,639 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:41:00,640 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:41:00,640 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:41:00,640 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:41:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:41:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 21:41:00,640 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:41:00,641 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2019-10-14 21:41:00,641 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:41:00,641 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:41:00,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:41:00,641 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:41:00,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:41:00,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:41:00,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:41:00,952 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:41:00,952 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-14 21:41:00,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:41:00 BoogieIcfgContainer [2019-10-14 21:41:00,954 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:41:00,955 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:41:00,955 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:41:00,958 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:41:00,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:41:00" (1/3) ... [2019-10-14 21:41:00,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66a5ab75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:41:00, skipping insertion in model container [2019-10-14 21:41:00,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:00" (2/3) ... [2019-10-14 21:41:00,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66a5ab75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:41:00, skipping insertion in model container [2019-10-14 21:41:00,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:41:00" (3/3) ... [2019-10-14 21:41:00,961 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum2.c [2019-10-14 21:41:00,971 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:41:00,978 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:41:00,988 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:41:01,010 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:41:01,011 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:41:01,011 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:41:01,011 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:41:01,011 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:41:01,011 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:41:01,011 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:41:01,011 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:41:01,027 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2019-10-14 21:41:01,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:41:01,033 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:01,034 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:01,035 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:01,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:01,041 INFO L82 PathProgramCache]: Analyzing trace with hash -286857817, now seen corresponding path program 1 times [2019-10-14 21:41:01,047 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:01,047 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535286899] [2019-10-14 21:41:01,048 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,048 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,048 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:01,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:01,218 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535286899] [2019-10-14 21:41:01,219 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:01,219 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:41:01,219 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795927038] [2019-10-14 21:41:01,226 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:41:01,227 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:01,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:41:01,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:41:01,244 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 3 states. [2019-10-14 21:41:01,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:01,396 INFO L93 Difference]: Finished difference Result 59 states and 79 transitions. [2019-10-14 21:41:01,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:41:01,399 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-10-14 21:41:01,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:01,410 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:41:01,411 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:41:01,418 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:41:01,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:41:01,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:41:01,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:41:01,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-10-14 21:41:01,473 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 20 [2019-10-14 21:41:01,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:01,474 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-10-14 21:41:01,475 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:41:01,475 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-10-14 21:41:01,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:41:01,477 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:01,478 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:01,478 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:01,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:01,480 INFO L82 PathProgramCache]: Analyzing trace with hash 1625158677, now seen corresponding path program 1 times [2019-10-14 21:41:01,480 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:01,480 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377334121] [2019-10-14 21:41:01,481 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,481 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:01,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:01,616 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377334121] [2019-10-14 21:41:01,616 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:01,616 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-14 21:41:01,617 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864377760] [2019-10-14 21:41:01,619 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:41:01,620 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:01,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:41:01,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:41:01,621 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 6 states. [2019-10-14 21:41:01,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:01,775 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2019-10-14 21:41:01,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:01,775 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-14 21:41:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:01,777 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:41:01,777 INFO L226 Difference]: Without dead ends: 33 [2019-10-14 21:41:01,778 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:41:01,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-14 21:41:01,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-10-14 21:41:01,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 21:41:01,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-10-14 21:41:01,794 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 20 [2019-10-14 21:41:01,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:01,794 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-10-14 21:41:01,794 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:41:01,795 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-10-14 21:41:01,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 21:41:01,797 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:01,797 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:01,798 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:01,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:01,799 INFO L82 PathProgramCache]: Analyzing trace with hash -573455021, now seen corresponding path program 1 times [2019-10-14 21:41:01,800 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:01,800 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549320290] [2019-10-14 21:41:01,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:01,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:01,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:01,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:41:01,912 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549320290] [2019-10-14 21:41:01,912 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:01,913 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:41:01,913 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015386796] [2019-10-14 21:41:01,918 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:41:01,918 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:01,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:41:01,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:41:01,919 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 4 states. [2019-10-14 21:41:02,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:02,009 INFO L93 Difference]: Finished difference Result 59 states and 73 transitions. [2019-10-14 21:41:02,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:41:02,011 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2019-10-14 21:41:02,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:02,013 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:41:02,014 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:41:02,015 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:41:02,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:41:02,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-14 21:41:02,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:41:02,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-14 21:41:02,027 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 22 [2019-10-14 21:41:02,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:02,027 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-14 21:41:02,027 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:41:02,028 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-14 21:41:02,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 21:41:02,030 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:02,030 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:02,031 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:02,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:02,032 INFO L82 PathProgramCache]: Analyzing trace with hash 2038931473, now seen corresponding path program 1 times [2019-10-14 21:41:02,032 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:02,032 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22626707] [2019-10-14 21:41:02,033 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,033 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,034 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:02,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:41:02,141 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22626707] [2019-10-14 21:41:02,142 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:02,142 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 21:41:02,142 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462390982] [2019-10-14 21:41:02,143 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:41:02,143 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:02,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:41:02,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:41:02,144 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 5 states. [2019-10-14 21:41:02,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:02,264 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2019-10-14 21:41:02,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:02,266 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2019-10-14 21:41:02,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:02,268 INFO L225 Difference]: With dead ends: 54 [2019-10-14 21:41:02,268 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:41:02,268 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:41:02,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:41:02,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2019-10-14 21:41:02,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:41:02,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-10-14 21:41:02,282 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2019-10-14 21:41:02,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:02,283 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-10-14 21:41:02,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:41:02,283 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-10-14 21:41:02,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 21:41:02,285 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:02,285 INFO L380 BasicCegarLoop]: trace histogram [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] [2019-10-14 21:41:02,286 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:02,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:02,286 INFO L82 PathProgramCache]: Analyzing trace with hash -2121276981, now seen corresponding path program 1 times [2019-10-14 21:41:02,286 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:02,287 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104320791] [2019-10-14 21:41:02,288 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,289 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:02,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,389 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:41:02,389 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104320791] [2019-10-14 21:41:02,390 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031046748] [2019-10-14 21:41:02,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:02,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,463 INFO L256 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:41:02,471 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:02,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:41:02,536 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:02,536 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-10-14 21:41:02,537 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210417997] [2019-10-14 21:41:02,538 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:41:02,538 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:02,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:41:02,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:41:02,539 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2019-10-14 21:41:02,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:02,632 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2019-10-14 21:41:02,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:02,633 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-10-14 21:41:02,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:02,634 INFO L225 Difference]: With dead ends: 55 [2019-10-14 21:41:02,634 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:41:02,635 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:41:02,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:41:02,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-10-14 21:41:02,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 21:41:02,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2019-10-14 21:41:02,640 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 30 [2019-10-14 21:41:02,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:02,641 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2019-10-14 21:41:02,641 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:41:02,641 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2019-10-14 21:41:02,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:41:02,642 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:02,642 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:02,845 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:02,846 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:02,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:02,846 INFO L82 PathProgramCache]: Analyzing trace with hash -376037751, now seen corresponding path program 2 times [2019-10-14 21:41:02,847 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:02,847 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783118389] [2019-10-14 21:41:02,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,848 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:02,848 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:02,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:02,920 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:41:02,921 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783118389] [2019-10-14 21:41:02,921 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535299497] [2019-10-14 21:41:02,921 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:02,982 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:41:02,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:02,985 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:41:02,988 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:03,029 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:41:03,030 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:03,030 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2019-10-14 21:41:03,030 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709543495] [2019-10-14 21:41:03,031 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:41:03,031 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:03,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:41:03,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:41:03,037 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 8 states. [2019-10-14 21:41:03,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:03,184 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2019-10-14 21:41:03,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:41:03,185 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2019-10-14 21:41:03,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:03,186 INFO L225 Difference]: With dead ends: 62 [2019-10-14 21:41:03,187 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:41:03,187 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:41:03,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:41:03,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2019-10-14 21:41:03,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-14 21:41:03,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2019-10-14 21:41:03,201 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2019-10-14 21:41:03,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:03,201 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2019-10-14 21:41:03,201 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:41:03,202 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2019-10-14 21:41:03,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 21:41:03,204 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:03,204 INFO L380 BasicCegarLoop]: trace histogram [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] [2019-10-14 21:41:03,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:03,409 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:03,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:03,410 INFO L82 PathProgramCache]: Analyzing trace with hash -740334591, now seen corresponding path program 3 times [2019-10-14 21:41:03,410 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:03,410 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755053292] [2019-10-14 21:41:03,410 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:03,411 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:03,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:03,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:04,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:04,145 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:04,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755053292] [2019-10-14 21:41:04,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393569940] [2019-10-14 21:41:04,146 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:04,200 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:41:04,201 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:04,202 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 52 conjunts are in the unsatisfiable core [2019-10-14 21:41:04,209 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:04,301 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-14 21:41:04,301 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:04,314 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:04,315 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:04,315 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:28, output treesize:13 [2019-10-14 21:41:05,006 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:05,007 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2019-10-14 21:41:05,008 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-10-14 21:41:05,018 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:05,019 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:05,023 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-10-14 21:41:05,024 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:32 [2019-10-14 21:41:05,088 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:05,157 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:05,187 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:05,248 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:05,249 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:05,249 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 22] total 35 [2019-10-14 21:41:05,249 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981769192] [2019-10-14 21:41:05,250 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 21:41:05,250 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:05,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 21:41:05,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1067, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:41:05,251 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 35 states. [2019-10-14 21:41:06,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:06,688 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2019-10-14 21:41:06,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:41:06,688 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 40 [2019-10-14 21:41:06,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:06,690 INFO L225 Difference]: With dead ends: 98 [2019-10-14 21:41:06,691 INFO L226 Difference]: Without dead ends: 92 [2019-10-14 21:41:06,693 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 22 SyntacticMatches, 10 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=212, Invalid=1950, Unknown=0, NotChecked=0, Total=2162 [2019-10-14 21:41:06,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-14 21:41:06,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 58. [2019-10-14 21:41:06,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:41:06,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2019-10-14 21:41:06,702 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 40 [2019-10-14 21:41:06,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:06,703 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2019-10-14 21:41:06,703 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 21:41:06,703 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2019-10-14 21:41:06,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 21:41:06,704 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:06,704 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 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] [2019-10-14 21:41:06,908 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:06,909 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:06,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:06,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1774785985, now seen corresponding path program 4 times [2019-10-14 21:41:06,909 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:06,909 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588226404] [2019-10-14 21:41:06,909 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:06,909 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:06,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:06,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:06,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:07,001 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:41:07,002 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588226404] [2019-10-14 21:41:07,002 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889022964] [2019-10-14 21:41:07,002 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:07,058 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:41:07,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:07,059 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:41:07,061 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:07,114 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 21:41:07,115 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:07,115 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-10-14 21:41:07,115 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763516982] [2019-10-14 21:41:07,116 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:41:07,116 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:07,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:41:07,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:41:07,117 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand 14 states. [2019-10-14 21:41:07,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:07,372 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2019-10-14 21:41:07,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:41:07,373 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2019-10-14 21:41:07,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:07,374 INFO L225 Difference]: With dead ends: 110 [2019-10-14 21:41:07,374 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:41:07,375 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:41:07,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:41:07,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2019-10-14 21:41:07,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:41:07,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2019-10-14 21:41:07,385 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 42 [2019-10-14 21:41:07,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:07,385 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2019-10-14 21:41:07,385 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:41:07,385 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2019-10-14 21:41:07,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:41:07,386 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:07,387 INFO L380 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2019-10-14 21:41:07,589 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:07,590 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:07,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:07,591 INFO L82 PathProgramCache]: Analyzing trace with hash -536741379, now seen corresponding path program 5 times [2019-10-14 21:41:07,591 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:07,592 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174241337] [2019-10-14 21:41:07,592 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:07,593 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:07,593 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:07,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:07,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:07,688 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-14 21:41:07,688 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174241337] [2019-10-14 21:41:07,689 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158942010] [2019-10-14 21:41:07,689 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:07,746 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:41:07,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:07,748 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:41:07,750 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:07,871 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-14 21:41:07,872 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:07,872 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2019-10-14 21:41:07,872 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286135127] [2019-10-14 21:41:07,873 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:41:07,873 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:07,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:41:07,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:41:07,874 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand 17 states. [2019-10-14 21:41:08,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:08,192 INFO L93 Difference]: Finished difference Result 89 states and 101 transitions. [2019-10-14 21:41:08,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:41:08,192 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2019-10-14 21:41:08,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:08,194 INFO L225 Difference]: With dead ends: 89 [2019-10-14 21:41:08,194 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:41:08,197 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:41:08,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:41:08,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2019-10-14 21:41:08,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-14 21:41:08,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2019-10-14 21:41:08,214 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 44 [2019-10-14 21:41:08,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:08,215 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2019-10-14 21:41:08,215 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:41:08,215 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2019-10-14 21:41:08,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:41:08,216 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:08,216 INFO L380 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1] [2019-10-14 21:41:08,428 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:08,429 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:08,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:08,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1811621193, now seen corresponding path program 6 times [2019-10-14 21:41:08,430 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:08,430 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294827909] [2019-10-14 21:41:08,430 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:08,430 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:08,430 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:08,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:11,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:11,319 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:11,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294827909] [2019-10-14 21:41:11,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533043748] [2019-10-14 21:41:11,319 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:11,385 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:41:11,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:11,387 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 65 conjunts are in the unsatisfiable core [2019-10-14 21:41:11,390 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:13,276 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:13,278 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:41:13,278 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:41:13,279 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:41:13,288 INFO L341 Elim1Store]: treesize reduction 3, result has 76.9 percent of original size [2019-10-14 21:41:13,289 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 42 treesize of output 20 [2019-10-14 21:41:13,290 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:13,303 INFO L567 ElimStorePlain]: treesize reduction 3, result has 81.3 percent of original size [2019-10-14 21:41:13,303 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:13,304 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:55, output treesize:3 [2019-10-14 21:41:13,328 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:13,440 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:13,440 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:13,440 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 35] total 70 [2019-10-14 21:41:13,441 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660829730] [2019-10-14 21:41:13,441 INFO L442 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-10-14 21:41:13,441 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:13,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-10-14 21:41:13,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=486, Invalid=4344, Unknown=0, NotChecked=0, Total=4830 [2019-10-14 21:41:13,444 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 70 states. [2019-10-14 21:41:19,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:19,006 INFO L93 Difference]: Finished difference Result 122 states and 134 transitions. [2019-10-14 21:41:19,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-14 21:41:19,006 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 50 [2019-10-14 21:41:19,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:19,008 INFO L225 Difference]: With dead ends: 122 [2019-10-14 21:41:19,008 INFO L226 Difference]: Without dead ends: 116 [2019-10-14 21:41:19,012 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 20 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3762 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1166, Invalid=10390, Unknown=0, NotChecked=0, Total=11556 [2019-10-14 21:41:19,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-10-14 21:41:19,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 72. [2019-10-14 21:41:19,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-14 21:41:19,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 79 transitions. [2019-10-14 21:41:19,023 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 79 transitions. Word has length 50 [2019-10-14 21:41:19,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:19,023 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 79 transitions. [2019-10-14 21:41:19,024 INFO L463 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-10-14 21:41:19,024 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 79 transitions. [2019-10-14 21:41:19,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-14 21:41:19,025 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:19,025 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1] [2019-10-14 21:41:19,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:19,229 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:19,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:19,229 INFO L82 PathProgramCache]: Analyzing trace with hash -489059467, now seen corresponding path program 7 times [2019-10-14 21:41:19,229 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:19,230 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961826706] [2019-10-14 21:41:19,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:19,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:19,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:19,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:19,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:19,331 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-10-14 21:41:19,331 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961826706] [2019-10-14 21:41:19,333 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226855113] [2019-10-14 21:41:19,333 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:19,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:19,404 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:41:19,418 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-10-14 21:41:19,490 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:19,490 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-14 21:41:19,490 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891480269] [2019-10-14 21:41:19,491 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:41:19,492 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:19,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:41:19,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:41:19,492 INFO L87 Difference]: Start difference. First operand 72 states and 79 transitions. Second operand 17 states. [2019-10-14 21:41:19,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:19,778 INFO L93 Difference]: Finished difference Result 138 states and 152 transitions. [2019-10-14 21:41:19,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:41:19,778 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2019-10-14 21:41:19,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:19,779 INFO L225 Difference]: With dead ends: 138 [2019-10-14 21:41:19,779 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:41:19,780 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:41:19,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:41:19,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-10-14 21:41:19,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-14 21:41:19,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2019-10-14 21:41:19,790 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 52 [2019-10-14 21:41:19,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:19,790 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2019-10-14 21:41:19,790 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:41:19,792 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2019-10-14 21:41:19,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 21:41:19,793 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:19,793 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 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] [2019-10-14 21:41:20,000 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:20,001 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:20,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:20,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1826978381, now seen corresponding path program 8 times [2019-10-14 21:41:20,002 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:20,003 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487890753] [2019-10-14 21:41:20,003 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,003 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,003 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:20,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:20,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:20,093 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 21:41:20,093 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487890753] [2019-10-14 21:41:20,093 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568345132] [2019-10-14 21:41:20,093 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:20,144 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:41:20,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:20,145 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:41:20,147 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:20,214 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 21:41:20,214 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:20,215 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-14 21:41:20,215 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456925516] [2019-10-14 21:41:20,215 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:41:20,215 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:20,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:41:20,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:41:20,216 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand 17 states. [2019-10-14 21:41:20,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:20,545 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2019-10-14 21:41:20,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:41:20,546 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 54 [2019-10-14 21:41:20,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:20,547 INFO L225 Difference]: With dead ends: 107 [2019-10-14 21:41:20,547 INFO L226 Difference]: Without dead ends: 65 [2019-10-14 21:41:20,548 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=150, Invalid=402, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:41:20,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-10-14 21:41:20,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2019-10-14 21:41:20,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 21:41:20,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2019-10-14 21:41:20,555 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 54 [2019-10-14 21:41:20,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:20,555 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2019-10-14 21:41:20,556 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:41:20,556 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2019-10-14 21:41:20,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-10-14 21:41:20,557 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:20,557 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:20,769 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:20,769 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:20,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:20,770 INFO L82 PathProgramCache]: Analyzing trace with hash -381639187, now seen corresponding path program 9 times [2019-10-14 21:41:20,770 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:20,771 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250814589] [2019-10-14 21:41:20,771 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,771 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,772 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:20,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:21,611 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 35 [2019-10-14 21:41:21,762 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 31 [2019-10-14 21:41:21,909 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 39 [2019-10-14 21:41:22,076 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 35 [2019-10-14 21:41:22,214 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 38 [2019-10-14 21:41:22,967 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 37 [2019-10-14 21:41:23,411 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 32 [2019-10-14 21:41:25,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:26,020 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 1 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:26,020 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250814589] [2019-10-14 21:41:26,020 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105715824] [2019-10-14 21:41:26,020 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:26,084 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-14 21:41:26,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:26,087 INFO L256 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 87 conjunts are in the unsatisfiable core [2019-10-14 21:41:26,092 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:26,133 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-14 21:41:26,134 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:26,141 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:26,141 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:26,142 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2019-10-14 21:41:28,034 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:28,035 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:28,036 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:28,052 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:28,053 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 47 [2019-10-14 21:41:28,054 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,054 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,055 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,056 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,056 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,057 INFO L496 ElimStorePlain]: Start of recursive call 2: 2 dim-0 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2019-10-14 21:41:28,091 INFO L567 ElimStorePlain]: treesize reduction 28, result has 52.5 percent of original size [2019-10-14 21:41:28,092 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,094 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-10-14 21:41:28,094 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:47, output treesize:21 [2019-10-14 21:41:28,224 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,251 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:28,371 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 7 proven. 64 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:28,371 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:28,371 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 31] total 79 [2019-10-14 21:41:28,372 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787649801] [2019-10-14 21:41:28,372 INFO L442 AbstractCegarLoop]: Interpolant automaton has 79 states [2019-10-14 21:41:28,372 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:28,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2019-10-14 21:41:28,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=537, Invalid=5625, Unknown=0, NotChecked=0, Total=6162 [2019-10-14 21:41:28,375 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 79 states. [2019-10-14 21:41:30,414 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 61 [2019-10-14 21:41:33,146 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 60 [2019-10-14 21:41:33,505 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 47 [2019-10-14 21:41:34,236 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 55 [2019-10-14 21:41:35,474 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 54 [2019-10-14 21:41:37,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:37,874 INFO L93 Difference]: Finished difference Result 139 states and 154 transitions. [2019-10-14 21:41:37,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2019-10-14 21:41:37,875 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 60 [2019-10-14 21:41:37,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:37,878 INFO L225 Difference]: With dead ends: 139 [2019-10-14 21:41:37,878 INFO L226 Difference]: Without dead ends: 133 [2019-10-14 21:41:37,884 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 29 SyntacticMatches, 8 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6249 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=2098, Invalid=16534, Unknown=0, NotChecked=0, Total=18632 [2019-10-14 21:41:37,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2019-10-14 21:41:37,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 92. [2019-10-14 21:41:37,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:41:37,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2019-10-14 21:41:37,897 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 60 [2019-10-14 21:41:37,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:37,897 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2019-10-14 21:41:37,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 79 states. [2019-10-14 21:41:37,897 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2019-10-14 21:41:37,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:41:37,898 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:37,898 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:38,102 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:38,102 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:38,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:38,103 INFO L82 PathProgramCache]: Analyzing trace with hash -665886421, now seen corresponding path program 10 times [2019-10-14 21:41:38,103 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:38,103 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962866859] [2019-10-14 21:41:38,103 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:38,104 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:38,104 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:38,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:38,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-10-14 21:41:38,226 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962866859] [2019-10-14 21:41:38,226 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325843685] [2019-10-14 21:41:38,226 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:38,293 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:41:38,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:38,294 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:41:38,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:38,403 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-10-14 21:41:38,404 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:38,404 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-10-14 21:41:38,404 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177170065] [2019-10-14 21:41:38,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:41:38,405 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:38,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:41:38,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:41:38,406 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand 20 states. [2019-10-14 21:41:38,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:38,795 INFO L93 Difference]: Finished difference Result 191 states and 212 transitions. [2019-10-14 21:41:38,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:41:38,796 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2019-10-14 21:41:38,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:38,798 INFO L225 Difference]: With dead ends: 191 [2019-10-14 21:41:38,798 INFO L226 Difference]: Without dead ends: 95 [2019-10-14 21:41:38,799 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=552, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:41:38,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-10-14 21:41:38,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2019-10-14 21:41:38,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-10-14 21:41:38,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 104 transitions. [2019-10-14 21:41:38,810 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 104 transitions. Word has length 62 [2019-10-14 21:41:38,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:38,810 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 104 transitions. [2019-10-14 21:41:38,810 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:41:38,810 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 104 transitions. [2019-10-14 21:41:38,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-10-14 21:41:38,811 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:38,811 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:39,013 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:39,014 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:39,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:39,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1635572247, now seen corresponding path program 11 times [2019-10-14 21:41:39,015 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:39,015 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584808065] [2019-10-14 21:41:39,016 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:39,016 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:39,016 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:39,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:39,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:39,128 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-14 21:41:39,128 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584808065] [2019-10-14 21:41:39,129 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929088540] [2019-10-14 21:41:39,129 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:39,242 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:41:39,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:39,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:41:39,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:39,393 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-14 21:41:39,393 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:39,393 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2019-10-14 21:41:39,394 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895654758] [2019-10-14 21:41:39,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:41:39,394 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:39,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:41:39,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:41:39,395 INFO L87 Difference]: Start difference. First operand 94 states and 104 transitions. Second operand 25 states. [2019-10-14 21:41:39,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:39,894 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2019-10-14 21:41:39,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:41:39,895 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2019-10-14 21:41:39,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:39,896 INFO L225 Difference]: With dead ends: 131 [2019-10-14 21:41:39,896 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:41:39,897 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=203, Invalid=919, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:41:39,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:41:39,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 71. [2019-10-14 21:41:39,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-10-14 21:41:39,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2019-10-14 21:41:39,907 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 64 [2019-10-14 21:41:39,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:39,907 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2019-10-14 21:41:39,907 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:41:39,907 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2019-10-14 21:41:39,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-10-14 21:41:39,908 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:39,908 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:40,125 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:40,126 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:40,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:40,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1004217763, now seen corresponding path program 12 times [2019-10-14 21:41:40,127 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:40,127 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863737439] [2019-10-14 21:41:40,128 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:40,128 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:40,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:40,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:40,878 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 21 [2019-10-14 21:41:41,069 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 35 [2019-10-14 21:41:41,241 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 35 [2019-10-14 21:41:41,420 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 38 [2019-10-14 21:41:41,595 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 34 [2019-10-14 21:41:41,789 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 43 [2019-10-14 21:41:41,981 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 38 [2019-10-14 21:41:42,155 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 41 [2019-10-14 21:41:42,323 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 37 [2019-10-14 21:41:42,491 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 37 [2019-10-14 21:41:42,627 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 32 [2019-10-14 21:41:42,772 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 37 [2019-10-14 21:41:42,918 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 34 [2019-10-14 21:41:43,095 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 43 [2019-10-14 21:41:43,254 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 36 [2019-10-14 21:41:43,422 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 38 [2019-10-14 21:41:43,584 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 33 [2019-10-14 21:41:43,737 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 34