/usr/bin/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/loops-crafted-1/sumt4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 13:45:01,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:45:01,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:45:01,452 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:45:01,452 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:45:01,459 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:45:01,463 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:45:01,467 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:45:01,469 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:45:01,472 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:45:01,473 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:45:01,474 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:45:01,474 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:45:01,478 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:45:01,481 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:45:01,482 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:45:01,483 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:45:01,484 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:45:01,487 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:45:01,495 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:45:01,497 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:45:01,498 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:45:01,500 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:45:01,500 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:45:01,513 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:45:01,531 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:45:01,532 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:45:01,533 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:45:01,535 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:45:01,576 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:45:01,577 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:45:01,579 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:45:01,579 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:45:01,579 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:45:01,580 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:45:01,580 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:45:01,580 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:45:01,581 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:45:01,581 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:45:01,582 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:45:01,582 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:45:01,582 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:45:01,583 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:45:01,583 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:45:01,583 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:45:01,583 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:45:01,583 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:45:01,584 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:45:01,584 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:45:01,584 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:45:01,584 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:45:01,585 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:45:01,585 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:45:01,585 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:45:01,585 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:45:01,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:45:01,586 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:45:01,586 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:45:01,586 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:45:02,036 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:45:02,057 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:45:02,062 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:45:02,064 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:45:02,064 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:45:02,065 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt4.c [2020-09-04 13:45:02,143 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/107cccbf0/aec961437f514f7fa2bfb2cf507c1eed/FLAG9da78779b [2020-09-04 13:45:02,691 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:45:02,692 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops-crafted-1/sumt4.c [2020-09-04 13:45:02,700 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/107cccbf0/aec961437f514f7fa2bfb2cf507c1eed/FLAG9da78779b [2020-09-04 13:45:03,001 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/107cccbf0/aec961437f514f7fa2bfb2cf507c1eed [2020-09-04 13:45:03,016 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:45:03,018 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:45:03,019 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:45:03,019 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:45:03,026 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:45:03,027 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,032 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5955ed45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03, skipping insertion in model container [2020-09-04 13:45:03,033 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,044 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:45:03,074 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:45:03,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:45:03,354 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:45:03,375 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:45:03,396 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:45:03,396 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03 WrapperNode [2020-09-04 13:45:03,397 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:45:03,398 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:45:03,398 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:45:03,398 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:45:03,411 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,494 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,494 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,500 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... [2020-09-04 13:45:03,509 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:45:03,510 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:45:03,510 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:45:03,510 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:45:03,511 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:03,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:45:03,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:45:03,591 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 13:45:03,592 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 13:45:03,592 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:45:03,592 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:45:03,592 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 13:45:03,592 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 13:45:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 13:45:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 13:45:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:45:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:45:03,593 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:45:03,834 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:45:03,834 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 13:45:03,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:45:03 BoogieIcfgContainer [2020-09-04 13:45:03,839 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:45:03,840 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:45:03,841 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:45:03,844 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:45:03,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:45:03" (1/3) ... [2020-09-04 13:45:03,846 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ae51f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:45:03, skipping insertion in model container [2020-09-04 13:45:03,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:45:03" (2/3) ... [2020-09-04 13:45:03,847 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ae51f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:45:03, skipping insertion in model container [2020-09-04 13:45:03,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:45:03" (3/3) ... [2020-09-04 13:45:03,849 INFO L109 eAbstractionObserver]: Analyzing ICFG sumt4.c [2020-09-04 13:45:03,861 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:45:03,871 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:45:03,893 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:45:03,922 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:45:03,923 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:45:03,923 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:45:03,923 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:45:03,923 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:45:03,923 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:45:03,923 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:45:03,923 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:45:03,943 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-09-04 13:45:03,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-04 13:45:03,952 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:03,954 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:03,954 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:03,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:03,963 INFO L82 PathProgramCache]: Analyzing trace with hash -12471351, now seen corresponding path program 1 times [2020-09-04 13:45:03,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:03,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439891642] [2020-09-04 13:45:03,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:04,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:04,433 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 21 [2020-09-04 13:45:04,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:04,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:04,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:04,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439891642] [2020-09-04 13:45:04,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:45:04,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 13:45:04,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994374050] [2020-09-04 13:45:04,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:45:04,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:04,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:45:04,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:45:04,669 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 7 states. [2020-09-04 13:45:05,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:05,057 INFO L93 Difference]: Finished difference Result 48 states and 62 transitions. [2020-09-04 13:45:05,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:45:05,060 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-09-04 13:45:05,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:05,072 INFO L225 Difference]: With dead ends: 48 [2020-09-04 13:45:05,072 INFO L226 Difference]: Without dead ends: 21 [2020-09-04 13:45:05,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-09-04 13:45:05,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-04 13:45:05,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-09-04 13:45:05,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-04 13:45:05,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-09-04 13:45:05,131 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2020-09-04 13:45:05,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:05,131 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-09-04 13:45:05,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:45:05,132 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-09-04 13:45:05,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-04 13:45:05,133 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:05,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:05,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:45:05,134 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:05,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:05,134 INFO L82 PathProgramCache]: Analyzing trace with hash -793409467, now seen corresponding path program 1 times [2020-09-04 13:45:05,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:05,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782946649] [2020-09-04 13:45:05,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:05,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:05,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:05,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:05,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:05,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782946649] [2020-09-04 13:45:05,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157850731] [2020-09-04 13:45:05,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:05,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:05,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 19 conjunts are in the unsatisfiable core [2020-09-04 13:45:05,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:45:06,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:06,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:45:06,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 20 [2020-09-04 13:45:06,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519181874] [2020-09-04 13:45:06,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-04 13:45:06,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:06,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-04 13:45:06,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-09-04 13:45:06,122 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 20 states. [2020-09-04 13:45:06,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:06,581 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2020-09-04 13:45:06,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 13:45:06,582 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 15 [2020-09-04 13:45:06,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:06,583 INFO L225 Difference]: With dead ends: 37 [2020-09-04 13:45:06,584 INFO L226 Difference]: Without dead ends: 24 [2020-09-04 13:45:06,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=131, Invalid=571, Unknown=0, NotChecked=0, Total=702 [2020-09-04 13:45:06,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-04 13:45:06,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-04 13:45:06,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-04 13:45:06,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2020-09-04 13:45:06,592 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2020-09-04 13:45:06,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:06,592 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2020-09-04 13:45:06,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-04 13:45:06,592 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2020-09-04 13:45:06,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-04 13:45:06,593 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:06,594 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:06,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:45:06,808 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:06,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:06,809 INFO L82 PathProgramCache]: Analyzing trace with hash -594207024, now seen corresponding path program 1 times [2020-09-04 13:45:06,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:06,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745044674] [2020-09-04 13:45:06,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:06,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:07,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:07,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:07,529 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:07,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745044674] [2020-09-04 13:45:07,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702797232] [2020-09-04 13:45:07,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:07,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:07,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 24 conjunts are in the unsatisfiable core [2020-09-04 13:45:07,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:45:08,000 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:08,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:45:08,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 24 [2020-09-04 13:45:08,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747604375] [2020-09-04 13:45:08,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-04 13:45:08,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:08,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-04 13:45:08,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2020-09-04 13:45:08,004 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 24 states. [2020-09-04 13:45:08,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:08,745 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-09-04 13:45:08,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 13:45:08,746 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-09-04 13:45:08,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:08,747 INFO L225 Difference]: With dead ends: 42 [2020-09-04 13:45:08,748 INFO L226 Difference]: Without dead ends: 29 [2020-09-04 13:45:08,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2020-09-04 13:45:08,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-04 13:45:08,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-09-04 13:45:08,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-04 13:45:08,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-09-04 13:45:08,760 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 20 [2020-09-04 13:45:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:08,761 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-09-04 13:45:08,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-04 13:45:08,761 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-09-04 13:45:08,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-04 13:45:08,762 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:08,762 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:08,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:45:08,963 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:08,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:08,964 INFO L82 PathProgramCache]: Analyzing trace with hash -563580765, now seen corresponding path program 1 times [2020-09-04 13:45:08,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:08,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705416322] [2020-09-04 13:45:08,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:08,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:09,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:09,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:09,779 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:09,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705416322] [2020-09-04 13:45:09,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627293436] [2020-09-04 13:45:09,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:09,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:09,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 28 conjunts are in the unsatisfiable core [2020-09-04 13:45:09,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:45:10,398 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:10,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:45:10,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 28 [2020-09-04 13:45:10,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226949257] [2020-09-04 13:45:10,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-04 13:45:10,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:10,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-04 13:45:10,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=664, Unknown=0, NotChecked=0, Total=756 [2020-09-04 13:45:10,401 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 28 states. [2020-09-04 13:45:13,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:13,217 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-09-04 13:45:13,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 13:45:13,218 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 25 [2020-09-04 13:45:13,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:13,222 INFO L225 Difference]: With dead ends: 46 [2020-09-04 13:45:13,222 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 13:45:13,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 344 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=194, Invalid=1288, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 13:45:13,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 13:45:13,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-04 13:45:13,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-04 13:45:13,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2020-09-04 13:45:13,230 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 25 [2020-09-04 13:45:13,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:13,231 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2020-09-04 13:45:13,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-04 13:45:13,231 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2020-09-04 13:45:13,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 13:45:13,232 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:13,232 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:13,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:45:13,445 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:13,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:13,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1723884779, now seen corresponding path program 1 times [2020-09-04 13:45:13,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:13,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351381224] [2020-09-04 13:45:13,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:13,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:14,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:14,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351381224] [2020-09-04 13:45:14,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317663248] [2020-09-04 13:45:14,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:14,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:14,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 32 conjunts are in the unsatisfiable core [2020-09-04 13:45:14,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:45:14,904 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:14,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:45:14,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2020-09-04 13:45:14,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109390909] [2020-09-04 13:45:14,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 13:45:14,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:14,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 13:45:14,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-09-04 13:45:14,907 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 29 states. [2020-09-04 13:45:16,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:16,026 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2020-09-04 13:45:16,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 13:45:16,027 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2020-09-04 13:45:16,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:16,028 INFO L225 Difference]: With dead ends: 55 [2020-09-04 13:45:16,028 INFO L226 Difference]: Without dead ends: 41 [2020-09-04 13:45:16,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=199, Invalid=1693, Unknown=0, NotChecked=0, Total=1892 [2020-09-04 13:45:16,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-04 13:45:16,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-09-04 13:45:16,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-04 13:45:16,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2020-09-04 13:45:16,036 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 29 [2020-09-04 13:45:16,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:16,037 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2020-09-04 13:45:16,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 13:45:16,037 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2020-09-04 13:45:16,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-04 13:45:16,038 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:16,038 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:16,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:45:16,254 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:16,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:16,254 INFO L82 PathProgramCache]: Analyzing trace with hash -486027115, now seen corresponding path program 2 times [2020-09-04 13:45:16,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:16,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306966891] [2020-09-04 13:45:16,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:16,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:16,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:16,385 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:16,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306966891] [2020-09-04 13:45:16,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249571388] [2020-09-04 13:45:16,386 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:45:16,425 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:45:16,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:45:16,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 40 conjunts are in the unsatisfiable core [2020-09-04 13:45:16,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:45:17,110 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:17,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:45:17,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 19] total 26 [2020-09-04 13:45:17,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869599291] [2020-09-04 13:45:17,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-04 13:45:17,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:45:17,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-04 13:45:17,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2020-09-04 13:45:17,115 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 26 states. [2020-09-04 13:45:17,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:45:17,894 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2020-09-04 13:45:17,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 13:45:17,895 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 35 [2020-09-04 13:45:17,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:45:17,896 INFO L225 Difference]: With dead ends: 52 [2020-09-04 13:45:17,896 INFO L226 Difference]: Without dead ends: 42 [2020-09-04 13:45:17,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=133, Invalid=1349, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 13:45:17,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-04 13:45:17,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-04 13:45:17,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-04 13:45:17,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2020-09-04 13:45:17,905 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 35 [2020-09-04 13:45:17,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:45:17,905 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2020-09-04 13:45:17,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-04 13:45:17,906 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2020-09-04 13:45:17,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-04 13:45:17,907 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:45:17,907 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:45:18,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-09-04 13:45:18,122 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:45:18,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:45:18,123 INFO L82 PathProgramCache]: Analyzing trace with hash -301139428, now seen corresponding path program 3 times [2020-09-04 13:45:18,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:45:18,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436896133] [2020-09-04 13:45:18,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:45:18,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:19,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:45:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:45:19,068 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:45:19,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436896133] [2020-09-04 13:45:19,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545330774] [2020-09-04 13:45:19,070 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true