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/nla-digbench/bresenham.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 23:17:08,619 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 23:17:08,622 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 23:17:08,641 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 23:17:08,642 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 23:17:08,644 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 23:17:08,646 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 23:17:08,655 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 23:17:08,659 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 23:17:08,662 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 23:17:08,664 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 23:17:08,666 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 23:17:08,666 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 23:17:08,668 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 23:17:08,670 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 23:17:08,672 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 23:17:08,673 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 23:17:08,674 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 23:17:08,675 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 23:17:08,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 23:17:08,684 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 23:17:08,687 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 23:17:08,690 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 23:17:08,691 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 23:17:08,693 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 23:17:08,697 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 23:17:08,698 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 23:17:08,699 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 23:17:08,699 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 23:17:08,701 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 23:17:08,701 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 23:17:08,701 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 23:17:08,702 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 23:17:08,702 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 23:17:08,703 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 23:17:08,704 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 23:17:08,705 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 23:17:08,734 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 23:17:08,735 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 23:17:08,739 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 23:17:08,739 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 23:17:08,740 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 23:17:08,740 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 23:17:08,740 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 23:17:08,740 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 23:17:08,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 23:17:08,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 23:17:08,741 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 23:17:08,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 23:17:08,741 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 23:17:08,741 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 23:17:08,741 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 23:17:08,742 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 23:17:08,742 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 23:17:08,742 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 23:17:08,742 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 23:17:08,742 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 23:17:08,743 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 23:17:08,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 23:17:08,743 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 23:17:08,743 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 23:17:08,743 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 23:17:08,744 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 23:17:08,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 23:17:08,744 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 23:17:08,744 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 23:17:09,026 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 23:17:09,043 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 23:17:09,047 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 23:17:09,048 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 23:17:09,049 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 23:17:09,050 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/bresenham.c [2019-10-14 23:17:09,127 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4908d028a/35befa2d7f604f0c8eefc2abfe0d6781/FLAGe932b880e [2019-10-14 23:17:09,642 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 23:17:09,643 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/bresenham.c [2019-10-14 23:17:09,649 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4908d028a/35befa2d7f604f0c8eefc2abfe0d6781/FLAGe932b880e [2019-10-14 23:17:10,036 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4908d028a/35befa2d7f604f0c8eefc2abfe0d6781 [2019-10-14 23:17:10,048 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 23:17:10,049 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 23:17:10,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 23:17:10,051 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 23:17:10,054 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 23:17:10,055 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,058 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eb7c29b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10, skipping insertion in model container [2019-10-14 23:17:10,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,068 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 23:17:10,092 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 23:17:10,331 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:17:10,335 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 23:17:10,355 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 23:17:10,369 INFO L192 MainTranslator]: Completed translation [2019-10-14 23:17:10,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10 WrapperNode [2019-10-14 23:17:10,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 23:17:10,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 23:17:10,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 23:17:10,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 23:17:10,465 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,465 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,479 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,487 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (1/1) ... [2019-10-14 23:17:10,488 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 23:17:10,489 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 23:17:10,489 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 23:17:10,489 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 23:17:10,493 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (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 23:17:10,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 23:17:10,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 23:17:10,553 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 23:17:10,553 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 23:17:10,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 23:17:10,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 23:17:10,554 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 23:17:10,554 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 23:17:10,554 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 23:17:10,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 23:17:10,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 23:17:10,802 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 23:17:10,802 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-14 23:17:10,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:17:10 BoogieIcfgContainer [2019-10-14 23:17:10,804 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 23:17:10,805 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 23:17:10,805 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 23:17:10,812 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 23:17:10,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 11:17:10" (1/3) ... [2019-10-14 23:17:10,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cfcd555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:17:10, skipping insertion in model container [2019-10-14 23:17:10,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 11:17:10" (2/3) ... [2019-10-14 23:17:10,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cfcd555 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 11:17:10, skipping insertion in model container [2019-10-14 23:17:10,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 11:17:10" (3/3) ... [2019-10-14 23:17:10,822 INFO L109 eAbstractionObserver]: Analyzing ICFG bresenham.c [2019-10-14 23:17:10,844 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 23:17:10,856 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 23:17:10,871 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 23:17:10,897 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 23:17:10,897 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 23:17:10,898 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 23:17:10,898 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 23:17:10,898 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 23:17:10,898 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 23:17:10,899 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 23:17:10,899 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 23:17:10,922 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-14 23:17:10,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-14 23:17:10,928 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:10,929 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:10,932 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:10,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:10,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1560104174, now seen corresponding path program 1 times [2019-10-14 23:17:10,947 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:10,948 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140614600] [2019-10-14 23:17:10,948 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:10,949 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:10,949 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:11,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,070 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 23:17:11,070 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140614600] [2019-10-14 23:17:11,071 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:17:11,072 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-14 23:17:11,072 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743565714] [2019-10-14 23:17:11,077 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-14 23:17:11,077 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:11,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-14 23:17:11,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-14 23:17:11,090 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2019-10-14 23:17:11,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:11,109 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2019-10-14 23:17:11,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-14 23:17:11,111 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-10-14 23:17:11,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:11,119 INFO L225 Difference]: With dead ends: 39 [2019-10-14 23:17:11,119 INFO L226 Difference]: Without dead ends: 17 [2019-10-14 23:17:11,123 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-14 23:17:11,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-14 23:17:11,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-14 23:17:11,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-14 23:17:11,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-10-14 23:17:11,163 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 10 [2019-10-14 23:17:11,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:11,164 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-10-14 23:17:11,164 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-14 23:17:11,164 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-10-14 23:17:11,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-14 23:17:11,165 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:11,165 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:11,165 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:11,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:11,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1561891634, now seen corresponding path program 1 times [2019-10-14 23:17:11,166 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:11,166 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344327151] [2019-10-14 23:17:11,167 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,167 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,167 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:11,176 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:11,176 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2043822061] [2019-10-14 23:17:11,176 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 23:17:11,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,218 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 23:17:11,224 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:11,307 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 23:17:11,308 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344327151] [2019-10-14 23:17:11,308 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:11,308 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043822061] [2019-10-14 23:17:11,309 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 23:17:11,309 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 23:17:11,309 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913188101] [2019-10-14 23:17:11,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 23:17:11,311 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:11,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 23:17:11,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-14 23:17:11,312 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 5 states. [2019-10-14 23:17:11,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:11,436 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-10-14 23:17:11,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 23:17:11,437 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-10-14 23:17:11,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:11,440 INFO L225 Difference]: With dead ends: 28 [2019-10-14 23:17:11,441 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 23:17:11,443 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-14 23:17:11,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 23:17:11,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-14 23:17:11,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 23:17:11,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 23:17:11,466 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 10 [2019-10-14 23:17:11,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:11,468 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 23:17:11,469 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 23:17:11,469 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 23:17:11,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 23:17:11,471 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:11,473 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:11,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:11,679 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:11,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:11,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1038075816, now seen corresponding path program 1 times [2019-10-14 23:17:11,680 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:11,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887074645] [2019-10-14 23:17:11,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,681 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:11,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:11,689 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:11,689 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [760835963] [2019-10-14 23:17:11,690 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:17:11,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:11,748 WARN L254 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 23:17:11,754 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:11,891 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:17:11,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887074645] [2019-10-14 23:17:11,892 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:11,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760835963] [2019-10-14 23:17:11,892 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:11,893 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2019-10-14 23:17:11,893 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576635295] [2019-10-14 23:17:11,893 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:17:11,894 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:11,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:17:11,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:17:11,895 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 9 states. [2019-10-14 23:17:12,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:12,106 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2019-10-14 23:17:12,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:17:12,107 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2019-10-14 23:17:12,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:12,109 INFO L225 Difference]: With dead ends: 37 [2019-10-14 23:17:12,109 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 23:17:12,110 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:12,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 23:17:12,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-10-14 23:17:12,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 23:17:12,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-14 23:17:12,127 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 19 [2019-10-14 23:17:12,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:12,127 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-14 23:17:12,128 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:17:12,128 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-14 23:17:12,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 23:17:12,129 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:12,130 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:12,333 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:12,334 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:12,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:12,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1481884118, now seen corresponding path program 1 times [2019-10-14 23:17:12,336 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:12,336 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968158385] [2019-10-14 23:17:12,337 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,337 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,337 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:12,344 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:12,345 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [675920343] [2019-10-14 23:17:12,346 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:17:12,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:12,388 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 23:17:12,391 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:12,500 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 23:17:12,501 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968158385] [2019-10-14 23:17:12,501 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:12,501 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675920343] [2019-10-14 23:17:12,501 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:12,501 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2019-10-14 23:17:12,502 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608432457] [2019-10-14 23:17:12,502 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:17:12,502 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:12,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:17:12,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:17:12,503 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 9 states. [2019-10-14 23:17:12,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:12,638 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-10-14 23:17:12,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 23:17:12,639 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2019-10-14 23:17:12,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:12,640 INFO L225 Difference]: With dead ends: 45 [2019-10-14 23:17:12,640 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 23:17:12,641 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:12,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 23:17:12,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2019-10-14 23:17:12,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 23:17:12,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-14 23:17:12,649 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 19 [2019-10-14 23:17:12,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:12,650 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-14 23:17:12,650 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:17:12,650 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-14 23:17:12,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 23:17:12,651 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:12,651 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:12,860 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:12,861 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:12,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:12,862 INFO L82 PathProgramCache]: Analyzing trace with hash 190103611, now seen corresponding path program 1 times [2019-10-14 23:17:12,862 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:12,863 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349997227] [2019-10-14 23:17:12,863 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,864 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:12,864 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:12,870 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:12,871 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [765588034] [2019-10-14 23:17:12,871 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:17:12,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:12,905 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:17:12,907 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:13,050 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:17:13,089 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:13,089 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349997227] [2019-10-14 23:17:13,089 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:13,090 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765588034] [2019-10-14 23:17:13,090 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:13,090 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2019-10-14 23:17:13,090 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20646749] [2019-10-14 23:17:13,091 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:17:13,091 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:13,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:17:13,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:17:13,092 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 12 states. [2019-10-14 23:17:13,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:13,248 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2019-10-14 23:17:13,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 23:17:13,248 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2019-10-14 23:17:13,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:13,249 INFO L225 Difference]: With dead ends: 50 [2019-10-14 23:17:13,250 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 23:17:13,250 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:17:13,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 23:17:13,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2019-10-14 23:17:13,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 23:17:13,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-14 23:17:13,257 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 25 [2019-10-14 23:17:13,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:13,257 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-14 23:17:13,258 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 23:17:13,258 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-14 23:17:13,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:17:13,259 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:13,259 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:13,459 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:13,460 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:13,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:13,460 INFO L82 PathProgramCache]: Analyzing trace with hash -775079950, now seen corresponding path program 2 times [2019-10-14 23:17:13,461 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:13,461 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489891374] [2019-10-14 23:17:13,461 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:13,461 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:13,461 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:13,467 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:13,467 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [167951681] [2019-10-14 23:17:13,467 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 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 23:17:13,496 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:13,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:13,498 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 23:17:13,500 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:13,646 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:13,646 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489891374] [2019-10-14 23:17:13,646 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:13,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167951681] [2019-10-14 23:17:13,647 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:13,647 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2019-10-14 23:17:13,647 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994543717] [2019-10-14 23:17:13,648 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:17:13,648 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:13,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:17:13,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:13,649 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 11 states. [2019-10-14 23:17:13,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:13,863 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2019-10-14 23:17:13,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:17:13,864 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-10-14 23:17:13,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:13,868 INFO L225 Difference]: With dead ends: 54 [2019-10-14 23:17:13,869 INFO L226 Difference]: Without dead ends: 51 [2019-10-14 23:17:13,869 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:17:13,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-10-14 23:17:13,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 42. [2019-10-14 23:17:13,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 23:17:13,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2019-10-14 23:17:13,880 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 28 [2019-10-14 23:17:13,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:13,882 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2019-10-14 23:17:13,882 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:17:13,883 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2019-10-14 23:17:13,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:17:13,884 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:13,884 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:14,084 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:14,085 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:14,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:14,085 INFO L82 PathProgramCache]: Analyzing trace with hash 999927412, now seen corresponding path program 1 times [2019-10-14 23:17:14,085 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:14,086 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213870563] [2019-10-14 23:17:14,086 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,087 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,087 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:14,093 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:14,093 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [27736375] [2019-10-14 23:17:14,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) [2019-10-14 23:17:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:14,123 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 23:17:14,126 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:14,278 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:14,278 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213870563] [2019-10-14 23:17:14,278 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:14,278 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27736375] [2019-10-14 23:17:14,279 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:14,279 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2019-10-14 23:17:14,279 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013064941] [2019-10-14 23:17:14,280 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:17:14,280 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:14,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:17:14,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:14,281 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 11 states. [2019-10-14 23:17:14,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:14,458 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2019-10-14 23:17:14,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:17:14,459 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-10-14 23:17:14,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:14,460 INFO L225 Difference]: With dead ends: 54 [2019-10-14 23:17:14,460 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 23:17:14,461 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:17:14,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 23:17:14,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 49. [2019-10-14 23:17:14,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 23:17:14,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2019-10-14 23:17:14,469 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 28 [2019-10-14 23:17:14,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:14,470 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2019-10-14 23:17:14,470 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:17:14,471 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2019-10-14 23:17:14,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:17:14,471 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:14,472 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:14,672 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:14,673 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:14,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:14,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1796148304, now seen corresponding path program 2 times [2019-10-14 23:17:14,674 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:14,675 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450626226] [2019-10-14 23:17:14,675 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,675 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:14,675 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:14,681 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:14,681 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [856472514] [2019-10-14 23:17:14,681 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 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 23:17:14,716 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:14,716 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:14,717 WARN L254 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 23:17:14,722 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:14,838 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 23:17:14,838 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450626226] [2019-10-14 23:17:14,838 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:14,838 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856472514] [2019-10-14 23:17:14,839 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:14,839 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2019-10-14 23:17:14,839 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290305741] [2019-10-14 23:17:14,840 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:17:14,840 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:14,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:17:14,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:14,840 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 11 states. [2019-10-14 23:17:15,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:15,013 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2019-10-14 23:17:15,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:17:15,013 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-10-14 23:17:15,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:15,016 INFO L225 Difference]: With dead ends: 70 [2019-10-14 23:17:15,016 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 23:17:15,017 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:17:15,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 23:17:15,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 58. [2019-10-14 23:17:15,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 23:17:15,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2019-10-14 23:17:15,026 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 28 [2019-10-14 23:17:15,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:15,026 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2019-10-14 23:17:15,026 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:17:15,026 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2019-10-14 23:17:15,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 23:17:15,027 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:15,027 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:15,231 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:15,231 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:15,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:15,232 INFO L82 PathProgramCache]: Analyzing trace with hash -21140942, now seen corresponding path program 2 times [2019-10-14 23:17:15,233 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:15,233 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983372479] [2019-10-14 23:17:15,233 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:15,234 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:15,234 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:15,239 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:15,239 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1399712876] [2019-10-14 23:17:15,239 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 23:17:15,271 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:15,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:15,273 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-14 23:17:15,275 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:15,424 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 23:17:15,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983372479] [2019-10-14 23:17:15,425 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:15,425 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399712876] [2019-10-14 23:17:15,425 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:15,426 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2019-10-14 23:17:15,426 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487588669] [2019-10-14 23:17:15,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 23:17:15,426 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:15,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 23:17:15,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:15,427 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 11 states. [2019-10-14 23:17:15,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:15,603 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2019-10-14 23:17:15,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 23:17:15,604 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-10-14 23:17:15,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:15,605 INFO L225 Difference]: With dead ends: 70 [2019-10-14 23:17:15,606 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 23:17:15,607 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-10-14 23:17:15,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 23:17:15,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 58. [2019-10-14 23:17:15,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 23:17:15,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2019-10-14 23:17:15,619 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 28 [2019-10-14 23:17:15,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:15,619 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2019-10-14 23:17:15,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 23:17:15,619 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2019-10-14 23:17:15,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:17:15,622 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:15,622 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:15,822 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:15,823 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:15,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:15,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1039880453, now seen corresponding path program 1 times [2019-10-14 23:17:15,824 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:15,824 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460789494] [2019-10-14 23:17:15,824 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:15,825 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:15,825 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:15,831 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:15,831 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [470154888] [2019-10-14 23:17:15,831 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:17:15,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 23:17:15,860 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 23:17:15,861 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:15,991 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 23:17:15,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460789494] [2019-10-14 23:17:15,992 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:15,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470154888] [2019-10-14 23:17:15,992 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:15,993 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2019-10-14 23:17:15,993 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195637143] [2019-10-14 23:17:15,993 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:17:15,993 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:15,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:17:15,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:15,994 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 7 states. [2019-10-14 23:17:16,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:16,095 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2019-10-14 23:17:16,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:17:16,097 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2019-10-14 23:17:16,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:16,098 INFO L225 Difference]: With dead ends: 71 [2019-10-14 23:17:16,098 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 23:17:16,098 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:16,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 23:17:16,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2019-10-14 23:17:16,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 23:17:16,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2019-10-14 23:17:16,110 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 34 [2019-10-14 23:17:16,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:16,110 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2019-10-14 23:17:16,110 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:17:16,110 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2019-10-14 23:17:16,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:17:16,115 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:16,116 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:16,318 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:16,318 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:16,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:16,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1845541185, now seen corresponding path program 2 times [2019-10-14 23:17:16,319 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:16,320 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877883772] [2019-10-14 23:17:16,320 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,320 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,320 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:16,327 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:16,327 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [241083265] [2019-10-14 23:17:16,327 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 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 23:17:16,365 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:16,366 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:16,366 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 23:17:16,368 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:16,452 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-14 23:17:16,453 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877883772] [2019-10-14 23:17:16,453 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:16,453 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241083265] [2019-10-14 23:17:16,453 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:16,453 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2019-10-14 23:17:16,454 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403158536] [2019-10-14 23:17:16,454 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 23:17:16,454 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:16,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 23:17:16,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:16,455 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 7 states. [2019-10-14 23:17:16,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:16,624 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2019-10-14 23:17:16,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 23:17:16,625 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2019-10-14 23:17:16,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:16,626 INFO L225 Difference]: With dead ends: 74 [2019-10-14 23:17:16,627 INFO L226 Difference]: Without dead ends: 67 [2019-10-14 23:17:16,627 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 23:17:16,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-14 23:17:16,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2019-10-14 23:17:16,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-14 23:17:16,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2019-10-14 23:17:16,637 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 34 [2019-10-14 23:17:16,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:16,638 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2019-10-14 23:17:16,638 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 23:17:16,638 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2019-10-14 23:17:16,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 23:17:16,639 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:16,639 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:16,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:16,846 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:16,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:16,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1258735171, now seen corresponding path program 2 times [2019-10-14 23:17:16,847 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:16,847 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249677921] [2019-10-14 23:17:16,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,847 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:16,847 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:16,852 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:16,852 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2005961933] [2019-10-14 23:17:16,852 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 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 23:17:16,880 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 23:17:16,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:16,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 23:17:16,884 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:17,106 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:17:17,139 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 23:17:17,140 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249677921] [2019-10-14 23:17:17,140 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:17,140 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005961933] [2019-10-14 23:17:17,140 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:17,140 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2019-10-14 23:17:17,140 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398621159] [2019-10-14 23:17:17,141 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 23:17:17,141 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:17,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 23:17:17,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2019-10-14 23:17:17,142 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 14 states. [2019-10-14 23:17:17,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:17,331 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2019-10-14 23:17:17,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 23:17:17,332 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 34 [2019-10-14 23:17:17,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:17,333 INFO L225 Difference]: With dead ends: 72 [2019-10-14 23:17:17,333 INFO L226 Difference]: Without dead ends: 65 [2019-10-14 23:17:17,334 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2019-10-14 23:17:17,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-10-14 23:17:17,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 42. [2019-10-14 23:17:17,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 23:17:17,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2019-10-14 23:17:17,341 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 34 [2019-10-14 23:17:17,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:17,341 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2019-10-14 23:17:17,342 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 23:17:17,342 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2019-10-14 23:17:17,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 23:17:17,343 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:17,343 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:17,555 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:17,555 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:17,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:17,556 INFO L82 PathProgramCache]: Analyzing trace with hash 389577448, now seen corresponding path program 3 times [2019-10-14 23:17:17,556 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:17,556 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900689722] [2019-10-14 23:17:17,557 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:17,557 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:17,557 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:17,561 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:17,562 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [414929095] [2019-10-14 23:17:17,562 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:17,608 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 23:17:17,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:17,609 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 23:17:17,611 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:17,690 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 23:17:17,691 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900689722] [2019-10-14 23:17:17,691 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:17,691 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414929095] [2019-10-14 23:17:17,691 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:17,691 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2019-10-14 23:17:17,692 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16380361] [2019-10-14 23:17:17,692 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 23:17:17,692 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:17,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 23:17:17,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2019-10-14 23:17:17,694 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 9 states. [2019-10-14 23:17:17,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:17,782 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2019-10-14 23:17:17,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 23:17:17,783 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2019-10-14 23:17:17,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:17,784 INFO L225 Difference]: With dead ends: 71 [2019-10-14 23:17:17,784 INFO L226 Difference]: Without dead ends: 68 [2019-10-14 23:17:17,785 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2019-10-14 23:17:17,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-14 23:17:17,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2019-10-14 23:17:17,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 23:17:17,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 66 transitions. [2019-10-14 23:17:17,803 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 66 transitions. Word has length 37 [2019-10-14 23:17:17,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:17,803 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 66 transitions. [2019-10-14 23:17:17,803 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 23:17:17,804 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 66 transitions. [2019-10-14 23:17:17,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 23:17:17,804 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:17,805 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:18,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:18,006 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:18,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:18,007 INFO L82 PathProgramCache]: Analyzing trace with hash -2130382486, now seen corresponding path program 3 times [2019-10-14 23:17:18,007 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:18,007 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497549028] [2019-10-14 23:17:18,007 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:18,007 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:18,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:18,013 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:18,013 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [508136881] [2019-10-14 23:17:18,013 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:18,042 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 23:17:18,043 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:18,043 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 23:17:18,045 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 23:17:18,128 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497549028] [2019-10-14 23:17:18,128 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:18,128 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508136881] [2019-10-14 23:17:18,129 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:18,129 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2019-10-14 23:17:18,129 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847846420] [2019-10-14 23:17:18,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 23:17:18,130 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:18,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 23:17:18,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2019-10-14 23:17:18,130 INFO L87 Difference]: Start difference. First operand 60 states and 66 transitions. Second operand 10 states. [2019-10-14 23:17:18,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 23:17:18,278 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-14 23:17:18,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 23:17:18,278 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2019-10-14 23:17:18,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 23:17:18,279 INFO L225 Difference]: With dead ends: 80 [2019-10-14 23:17:18,280 INFO L226 Difference]: Without dead ends: 78 [2019-10-14 23:17:18,280 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2019-10-14 23:17:18,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-14 23:17:18,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-10-14 23:17:18,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-14 23:17:18,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2019-10-14 23:17:18,296 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 37 [2019-10-14 23:17:18,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 23:17:18,296 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2019-10-14 23:17:18,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 23:17:18,296 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2019-10-14 23:17:18,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 23:17:18,300 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 23:17:18,300 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 23:17:18,501 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:18,502 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 23:17:18,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 23:17:18,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1143516456, now seen corresponding path program 4 times [2019-10-14 23:17:18,503 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 23:17:18,503 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681799231] [2019-10-14 23:17:18,504 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:18,504 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 23:17:18,504 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 23:17:18,508 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-14 23:17:18,508 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2120399929] [2019-10-14 23:17:18,508 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 23:17:18,547 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 23:17:18,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 23:17:18,549 INFO L256 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 23:17:18,550 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 23:17:31,088 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 27 [2019-10-14 23:17:39,177 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 29 [2019-10-14 23:17:49,260 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 30 [2019-10-14 23:17:49,264 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 23:17:49,340 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 5 refuted. 13 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 23:17:49,341 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681799231] [2019-10-14 23:17:49,341 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-14 23:17:49,341 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120399929] [2019-10-14 23:17:49,341 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-10-14 23:17:49,341 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2019-10-14 23:17:49,342 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190426008] [2019-10-14 23:17:49,342 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 23:17:49,342 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 23:17:49,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 23:17:49,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=91, Unknown=16, NotChecked=0, Total=132 [2019-10-14 23:17:49,343 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 12 states.