/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 DAGSIZE --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/bitvector-loops/diamond_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:15:42,763 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:15:42,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:15:42,780 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 19:15:42,790 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:15:42,791 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:15:42,792 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:15:42,793 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:15:42,794 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:15:42,795 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:15:42,797 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:15:42,799 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:15:42,801 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:15:42,802 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:15:42,803 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:15:42,804 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:15:42,807 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:15:42,816 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:15:42,817 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:15:42,818 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:15:42,819 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 19:15:42,834 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:15:42,835 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:15:42,836 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:15:42,836 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:15:42,836 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:15:42,836 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:15:42,837 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:15:42,837 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:15:42,837 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:15:42,837 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:15:42,837 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:15:42,838 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:15:42,838 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:15:42,838 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:15:42,838 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:15:42,838 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:15:42,839 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:15:42,839 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:15:42,839 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:15:42,839 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:15:42,839 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:15:42,840 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:15:42,840 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:15:42,840 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:15:42,840 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:15:42,840 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:15:42,841 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,841 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:15:42,841 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:15:42,841 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 -> DAGSIZE 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 19:15:43,121 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:15:43,135 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:15:43,138 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:15:43,140 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:15:43,140 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:15:43,141 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 19:15:43,223 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a228b81cf/aa230b963ae74f99887e98c59827e7a2/FLAGb7e0b5469 [2020-07-21 19:15:43,744 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:15:43,745 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-21 19:15:43,752 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a228b81cf/aa230b963ae74f99887e98c59827e7a2/FLAGb7e0b5469 [2020-07-21 19:15:44,144 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a228b81cf/aa230b963ae74f99887e98c59827e7a2 [2020-07-21 19:15:44,157 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:15:44,161 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:15:44,166 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:44,166 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:15:44,170 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:15:44,172 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,177 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@575d5ade and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,177 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:15:44,214 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:15:44,406 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:44,410 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:15:44,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:44,456 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:15:44,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44 WrapperNode [2020-07-21 19:15:44,457 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:44,458 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:15:44,458 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:15:44,458 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:15:44,470 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,567 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,568 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,573 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,589 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,592 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:15:44,593 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:15:44,593 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:15:44,593 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:15:44,594 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (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 19:15:44,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:15:44,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:15:44,665 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 19:15:44,666 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:15:44,666 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:15:44,667 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 19:15:44,667 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 19:15:44,667 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:15:44,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:15:44,668 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:15:44,943 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:15:44,943 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:15:44,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:44 BoogieIcfgContainer [2020-07-21 19:15:44,947 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:15:44,948 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:15:44,948 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:15:44,951 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:15:44,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:15:44" (1/3) ... [2020-07-21 19:15:44,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16082b34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (2/3) ... [2020-07-21 19:15:44,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16082b34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:44" (3/3) ... [2020-07-21 19:15:44,955 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-1.c [2020-07-21 19:15:44,966 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:15:44,973 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:15:44,987 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:15:45,011 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:15:45,011 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:15:45,011 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:15:45,011 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:15:45,012 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:15:45,012 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:15:45,012 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:15:45,012 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:15:45,028 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 19:15:45,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 19:15:45,033 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:45,034 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:45,034 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:45,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:45,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2020-07-21 19:15:45,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:45,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019705910] [2020-07-21 19:15:45,047 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 19:15:45,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:45,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:45,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 19:15:45,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:45,165 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 19:15:45,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:45,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019705910] [2020-07-21 19:15:45,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:45,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 19:15:45,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133318265] [2020-07-21 19:15:45,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 19:15:45,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:45,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 19:15:45,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 19:15:45,192 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 19:15:45,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:45,217 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-07-21 19:15:45,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 19:15:45,219 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-21 19:15:45,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:45,228 INFO L225 Difference]: With dead ends: 38 [2020-07-21 19:15:45,228 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:15:45,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 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 19:15:45,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:15:45,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:15:45,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:15:45,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2020-07-21 19:15:45,285 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2020-07-21 19:15:45,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:45,285 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2020-07-21 19:15:45,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 19:15:45,286 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2020-07-21 19:15:45,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 19:15:45,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:45,290 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:45,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:45,504 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:45,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:45,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2020-07-21 19:15:45,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:45,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922732960] [2020-07-21 19:15:45,508 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 19:15:45,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:45,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:45,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 15 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:15:45,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:45,578 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 19:15:45,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:45,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922732960] [2020-07-21 19:15:45,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:45,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:15:45,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721800867] [2020-07-21 19:15:45,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:15:45,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:45,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:15:45,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:15:45,588 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2020-07-21 19:15:45,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:45,692 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2020-07-21 19:15:45,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:15:45,693 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 19:15:45,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:45,696 INFO L225 Difference]: With dead ends: 28 [2020-07-21 19:15:45,697 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:15:45,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 19:15:45,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:15:45,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-21 19:15:45,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 19:15:45,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2020-07-21 19:15:45,705 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2020-07-21 19:15:45,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:45,706 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2020-07-21 19:15:45,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:15:45,706 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2020-07-21 19:15:45,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:15:45,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:45,707 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:45,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:45,924 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:45,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:45,926 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2020-07-21 19:15:45,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:45,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18401171] [2020-07-21 19:15:45,927 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 [2020-07-21 19:15:45,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:45,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:45,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 19:15:45,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:46,028 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-21 19:15:46,031 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 19:15:46,042 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 19:15:46,053 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 19:15:46,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:46,071 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:46,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18401171] [2020-07-21 19:15:46,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:46,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:15:46,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245213509] [2020-07-21 19:15:46,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:15:46,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:46,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:15:46,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:15:46,074 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2020-07-21 19:15:46,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:46,188 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2020-07-21 19:15:46,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:15:46,189 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:15:46,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:46,191 INFO L225 Difference]: With dead ends: 50 [2020-07-21 19:15:46,191 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 19:15:46,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 19:15:46,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 19:15:46,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-21 19:15:46,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 19:15:46,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-07-21 19:15:46,200 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2020-07-21 19:15:46,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:46,200 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-07-21 19:15:46,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:15:46,201 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-07-21 19:15:46,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:15:46,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:46,202 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:46,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:46,416 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:46,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:46,416 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2020-07-21 19:15:46,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:46,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287577825] [2020-07-21 19:15:46,417 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 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:46,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:46,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:46,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 19:15:46,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:46,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:46,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:53,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:53,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287577825] [2020-07-21 19:15:53,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:53,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 19:15:53,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103256085] [2020-07-21 19:15:53,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 19:15:53,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:53,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 19:15:53,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=383, Unknown=3, NotChecked=0, Total=552 [2020-07-21 19:15:53,350 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 24 states. [2020-07-21 19:15:54,054 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 19:15:54,845 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 19:15:59,271 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 19:16:06,385 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 19:16:10,058 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 19:16:17,308 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 19:17:24,890 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-21 19:17:30,124 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 19:17:40,283 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-21 19:18:00,689 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-21 19:18:22,657 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 19:18:25,189 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-21 19:18:25,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:18:25,308 INFO L93 Difference]: Finished difference Result 145 states and 182 transitions. [2020-07-21 19:18:25,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 19:18:25,309 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 21 [2020-07-21 19:18:25,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:18:25,311 INFO L225 Difference]: With dead ends: 145 [2020-07-21 19:18:25,311 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 19:18:25,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 19 SyntacticMatches, 12 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 90.7s TimeCoverageRelationStatistics Valid=761, Invalid=1481, Unknown=14, NotChecked=0, Total=2256 [2020-07-21 19:18:25,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 19:18:25,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 60. [2020-07-21 19:18:25,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:18:25,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 77 transitions. [2020-07-21 19:18:25,325 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 77 transitions. Word has length 21 [2020-07-21 19:18:25,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:18:25,326 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 77 transitions. [2020-07-21 19:18:25,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 19:18:25,326 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 77 transitions. [2020-07-21 19:18:25,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:18:25,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:18:25,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:18:25,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:25,531 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:18:25,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:18:25,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1680266929, now seen corresponding path program 1 times [2020-07-21 19:18:25,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:18:25,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449280434] [2020-07-21 19:18:25,533 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:25,565 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:18:25,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:18:25,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 19:18:25,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:18:25,589 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 19:18:25,591 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 19:18:25,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:18:25,607 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:18:25,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449280434] [2020-07-21 19:18:25,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:18:25,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:18:25,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259432038] [2020-07-21 19:18:25,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:18:25,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:18:25,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:18:25,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:18:25,616 INFO L87 Difference]: Start difference. First operand 60 states and 77 transitions. Second operand 3 states. [2020-07-21 19:18:25,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:18:25,689 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 19:18:25,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:18:25,690 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:18:25,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:18:25,691 INFO L225 Difference]: With dead ends: 86 [2020-07-21 19:18:25,692 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 19:18:25,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 19:18:25,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 19:18:25,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2020-07-21 19:18:25,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:18:25,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-07-21 19:18:25,700 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2020-07-21 19:18:25,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:18:25,701 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-07-21 19:18:25,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:18:25,701 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-07-21 19:18:25,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:18:25,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:18:25,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:18:25,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:25,914 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:18:25,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:18:25,915 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2020-07-21 19:18:25,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:18:25,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80831088] [2020-07-21 19:18:25,916 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:25,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:18:25,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 19:18:25,946 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:18:25,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 19:18:25,955 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:18:25,968 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 19:18:25,969 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 19:18:26,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:18:26,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:18:26 BoogieIcfgContainer [2020-07-21 19:18:26,204 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:18:26,206 INFO L168 Benchmark]: Toolchain (without parser) took 162046.58 ms. Allocated memory was 145.2 MB in the beginning and 263.2 MB in the end (delta: 118.0 MB). Free memory was 102.5 MB in the beginning and 217.5 MB in the end (delta: -115.0 MB). Peak memory consumption was 2.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:18:26,206 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 145.2 MB. Free memory is still 121.0 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:18:26,207 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.66 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 19:18:26,208 INFO L168 Benchmark]: Boogie Preprocessor took 134.68 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.2 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:18:26,208 INFO L168 Benchmark]: RCFGBuilder took 354.21 ms. Allocated memory is still 202.4 MB. Free memory was 180.8 MB in the beginning and 165.0 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. [2020-07-21 19:18:26,209 INFO L168 Benchmark]: TraceAbstraction took 161255.72 ms. Allocated memory was 202.4 MB in the beginning and 263.2 MB in the end (delta: 60.8 MB). Free memory was 164.1 MB in the beginning and 217.5 MB in the end (delta: -53.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:18:26,213 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 145.2 MB. Free memory is still 121.0 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 291.66 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 134.68 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.2 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 354.21 ms. Allocated memory is still 202.4 MB. Free memory was 180.8 MB in the beginning and 165.0 MB in the end (delta: 15.8 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 161255.72 ms. Allocated memory was 202.4 MB in the beginning and 263.2 MB in the end (delta: 60.8 MB). Free memory was 164.1 MB in the beginning and 217.5 MB in the end (delta: -53.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int x = 0; [L13] unsigned int y = __VERIFIER_nondet_uint(); [L15] COND TRUE x < 99 VAL [x=0, y=3] [L16] COND FALSE !(y % 2 == 0) [L17] x += 2 VAL [x=2, y=3] [L19] COND FALSE !(y % 2 == 0) [L20] x -= 2 VAL [x=0, y=3] [L22] COND FALSE !(y % 2 == 0) [L23] x += 2 VAL [x=2, y=3] [L25] COND FALSE !(y % 2 == 0) [L26] x -= 2 VAL [x=0, y=3] [L28] COND FALSE !(y % 2 == 0) [L29] x += 2 VAL [x=2, y=3] [L31] COND FALSE !(y % 2 == 0) [L32] x -= 4 VAL [x=4294967294, y=3] [L34] COND FALSE !(y % 2 == 0) [L35] x += 4 VAL [x=2, y=3] [L37] COND FALSE !(y % 2 == 0) [L38] x += 2 VAL [x=4, y=3] [L40] COND FALSE !(y % 2 == 0) [L41] x -= 4 VAL [x=0, y=3] [L43] COND FALSE !(y % 2 == 0) [L44] x -= 4 VAL [x=4294967292, y=3] [L15] COND FALSE !(x < 99) VAL [x=4294967292, y=3] [L47] CALL __VERIFIER_assert((x % 2) == (y % 2)) VAL [\old(cond)=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 161.1s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 152.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 78 SDslu, 136 SDs, 0 SdLazy, 749 SolverSat, 528 SolverUnsat, 31 SolverUnknown, 0 SolverNotchecked, 65.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 135 GetRequests, 74 SyntacticMatches, 12 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 90.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 88 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 7.1s InterpolantComputationTime, 104 NumberOfCodeBlocks, 79 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 98 ConstructedInterpolants, 0 QuantifiedInterpolants, 4360 SizeOfPredicates, 4 NumberOfNonLiveVariables, 192 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 2/4 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...