/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/mod3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 17:10:33,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 17:10:33,429 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 17:10:33,444 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 17:10:33,445 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 17:10:33,447 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 17:10:33,449 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 17:10:33,451 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 17:10:33,453 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 17:10:33,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 17:10:33,454 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 17:10:33,456 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 17:10:33,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 17:10:33,458 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 17:10:33,459 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 17:10:33,460 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 17:10:33,461 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 17:10:33,462 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 17:10:33,465 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 17:10:33,468 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 17:10:33,471 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 17:10:33,473 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 17:10:33,476 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 17:10:33,477 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 17:10:33,481 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 17:10:33,495 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 17:10:33,496 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 17:10:33,498 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 17:10:33,499 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 [2020-07-21 17:10:33,519 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 17:10:33,520 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 17:10:33,521 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 17:10:33,522 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 17:10:33,522 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 17:10:33,522 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 17:10:33,523 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 17:10:33,523 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 17:10:33,523 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 17:10:33,523 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 17:10:33,524 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 17:10:33,524 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 17:10:33,524 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 17:10:33,524 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 17:10:33,524 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 17:10:33,525 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 17:10:33,525 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 17:10:33,525 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 17:10:33,525 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 17:10:33,525 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 17:10:33,526 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 17:10:33,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 17:10:33,526 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 17:10:33,526 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 17:10:33,527 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 17:10:33,527 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 17:10:33,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:10:33,527 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 17:10:33,527 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 17:10:33,528 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 17:10:33,894 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 17:10:33,915 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 17:10:33,921 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 17:10:33,924 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 17:10:33,925 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 17:10:33,926 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/mod3.c [2020-07-21 17:10:34,038 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/736d67575/1efc0cd335804998b1cb3e9790e5077a/FLAGb89b58ba5 [2020-07-21 17:10:34,703 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 17:10:34,704 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/mod3.c [2020-07-21 17:10:34,719 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/736d67575/1efc0cd335804998b1cb3e9790e5077a/FLAGb89b58ba5 [2020-07-21 17:10:35,012 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/736d67575/1efc0cd335804998b1cb3e9790e5077a [2020-07-21 17:10:35,032 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 17:10:35,038 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 17:10:35,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 17:10:35,040 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 17:10:35,046 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 17:10:35,048 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b3b0ad3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35, skipping insertion in model container [2020-07-21 17:10:35,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,064 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 17:10:35,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 17:10:35,472 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:10:35,491 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 17:10:35,542 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 17:10:35,575 INFO L208 MainTranslator]: Completed translation [2020-07-21 17:10:35,576 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35 WrapperNode [2020-07-21 17:10:35,576 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 17:10:35,578 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 17:10:35,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 17:10:35,579 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 17:10:35,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,615 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,623 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,633 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,635 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (1/1) ... [2020-07-21 17:10:35,737 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 17:10:35,739 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 17:10:35,739 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 17:10:35,740 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 17:10:35,748 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (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 [2020-07-21 17:10:35,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 17:10:35,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 17:10:35,870 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 17:10:35,871 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 17:10:35,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 17:10:35,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 17:10:35,873 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 17:10:35,873 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 17:10:35,873 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 17:10:35,874 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 17:10:36,172 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 17:10:36,173 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 17:10:36,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:10:36 BoogieIcfgContainer [2020-07-21 17:10:36,179 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 17:10:36,182 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 17:10:36,182 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 17:10:36,188 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 17:10:36,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:10:35" (1/3) ... [2020-07-21 17:10:36,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44807c91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:10:36, skipping insertion in model container [2020-07-21 17:10:36,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:10:35" (2/3) ... [2020-07-21 17:10:36,192 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44807c91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:10:36, skipping insertion in model container [2020-07-21 17:10:36,192 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:10:36" (3/3) ... [2020-07-21 17:10:36,195 INFO L109 eAbstractionObserver]: Analyzing ICFG mod3.c [2020-07-21 17:10:36,214 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 17:10:36,228 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 17:10:36,253 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 17:10:36,317 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 17:10:36,318 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 17:10:36,318 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 17:10:36,319 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 17:10:36,319 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 17:10:36,319 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 17:10:36,320 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 17:10:36,320 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 17:10:36,365 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-21 17:10:36,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 17:10:36,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:10:36,402 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:10:36,407 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:10:36,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:10:36,419 INFO L82 PathProgramCache]: Analyzing trace with hash 271538127, now seen corresponding path program 1 times [2020-07-21 17:10:36,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:10:36,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466837227] [2020-07-21 17:10:36,434 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:10:36,525 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:10:36,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:10:36,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 17:10:36,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:10:36,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:10:36,562 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:10:36,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466837227] [2020-07-21 17:10:36,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:10:36,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 17:10:36,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079992162] [2020-07-21 17:10:36,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 17:10:36,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:10:36,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 17:10:36,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 17:10:36,592 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2020-07-21 17:10:36,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:10:36,623 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 17:10:36,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 17:10:36,625 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-07-21 17:10:36,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:10:36,638 INFO L225 Difference]: With dead ends: 36 [2020-07-21 17:10:36,638 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 17:10:36,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 17:10:36,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 17:10:36,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 17:10:36,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 17:10:36,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2020-07-21 17:10:36,710 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2020-07-21 17:10:36,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:10:36,712 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2020-07-21 17:10:36,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 17:10:36,712 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2020-07-21 17:10:36,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 17:10:36,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:10:36,713 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:10:36,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:10:36,930 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:10:36,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:10:36,932 INFO L82 PathProgramCache]: Analyzing trace with hash 183026044, now seen corresponding path program 1 times [2020-07-21 17:10:36,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:10:36,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520929158] [2020-07-21 17:10:36,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:10:36,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:10:36,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:10:36,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 17:10:36,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:10:37,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:10:37,021 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 17:10:37,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520929158] [2020-07-21 17:10:37,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 17:10:37,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 17:10:37,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529793017] [2020-07-21 17:10:37,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 17:10:37,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:10:37,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 17:10:37,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:10:37,026 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 3 states. [2020-07-21 17:10:37,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:10:37,139 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2020-07-21 17:10:37,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 17:10:37,142 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-21 17:10:37,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:10:37,144 INFO L225 Difference]: With dead ends: 27 [2020-07-21 17:10:37,145 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 17:10:37,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 17:10:37,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 17:10:37,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-07-21 17:10:37,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 17:10:37,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-07-21 17:10:37,164 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2020-07-21 17:10:37,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:10:37,165 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-07-21 17:10:37,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 17:10:37,167 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-07-21 17:10:37,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 17:10:37,170 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:10:37,170 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:10:37,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:10:37,385 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:10:37,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:10:37,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1587594336, now seen corresponding path program 1 times [2020-07-21 17:10:37,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:10:37,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408944083] [2020-07-21 17:10:37,388 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in