/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_FUNCTIONS --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/recursive-simple/id2_b5_o10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:24:17,448 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:24:17,451 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:24:17,470 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:24:17,471 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:24:17,473 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:24:17,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:24:17,486 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:24:17,492 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:24:17,494 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:24:17,495 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:24:17,497 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:24:17,497 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:24:17,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:24:17,502 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:24:17,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:24:17,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:24:17,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:24:17,507 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:24:17,512 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:24:17,517 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:24:17,521 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:24:17,523 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:24:17,523 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:24:17,526 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:24:17,536 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:24:17,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:24:17,538 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:24:17,539 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 13:24:17,576 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:24:17,580 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:24:17,582 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:24:17,582 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:24:17,582 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:24:17,582 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:24:17,582 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:24:17,583 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:24:17,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:24:17,583 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:24:17,583 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:24:17,586 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:24:17,586 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:24:17,587 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:24:17,587 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:24:17,587 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:24:17,587 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:24:17,587 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:24:17,587 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:24:17,588 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:24:17,588 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:24:17,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:17,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:24:17,589 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:24:17,589 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_FUNCTIONS 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 13:24:17,922 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:24:17,938 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:24:17,942 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:24:17,943 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:24:17,943 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:24:17,944 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 13:24:18,006 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5092ead/c194c28fc90a435bb3f0b4afa2555483/FLAGdcff6188d [2020-07-21 13:24:18,424 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:24:18,425 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 13:24:18,430 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5092ead/c194c28fc90a435bb3f0b4afa2555483/FLAGdcff6188d [2020-07-21 13:24:18,843 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5092ead/c194c28fc90a435bb3f0b4afa2555483 [2020-07-21 13:24:18,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:24:18,857 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:24:18,859 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:24:18,859 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:24:18,863 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:24:18,864 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:24:18" (1/1) ... [2020-07-21 13:24:18,867 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bc9ad26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:18, skipping insertion in model container [2020-07-21 13:24:18,867 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:24:18" (1/1) ... [2020-07-21 13:24:18,876 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:24:18,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:24:19,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:24:19,100 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:24:19,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:24:19,138 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:24:19,140 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19 WrapperNode [2020-07-21 13:24:19,140 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:24:19,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:24:19,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:24:19,142 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:24:19,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,173 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,173 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,301 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,304 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (1/1) ... [2020-07-21 13:24:19,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:24:19,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:24:19,311 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:24:19,311 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:24:19,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (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 13:24:19,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:24:19,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:24:19,393 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:24:19,393 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 13:24:19,393 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:24:19,394 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 13:24:19,394 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:24:19,394 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:24:19,394 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 13:24:19,395 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:24:19,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:24:19,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:24:19,736 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:24:19,736 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:24:19,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:24:19 BoogieIcfgContainer [2020-07-21 13:24:19,742 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:24:19,745 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:24:19,745 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:24:19,748 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:24:19,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:24:18" (1/3) ... [2020-07-21 13:24:19,750 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f72e29d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:24:19, skipping insertion in model container [2020-07-21 13:24:19,750 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:19" (2/3) ... [2020-07-21 13:24:19,751 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f72e29d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:24:19, skipping insertion in model container [2020-07-21 13:24:19,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:24:19" (3/3) ... [2020-07-21 13:24:19,753 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b5_o10.c [2020-07-21 13:24:19,764 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:24:19,776 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:24:19,791 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:24:19,826 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:24:19,826 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:24:19,826 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:24:19,827 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:24:19,827 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:24:19,827 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:24:19,827 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:24:19,827 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:24:19,852 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 13:24:19,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:24:19,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:19,862 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:19,863 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:19,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:19,871 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 13:24:19,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:19,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964801779] [2020-07-21 13:24:19,883 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 13:24:19,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:19,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:20,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:20,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:20,091 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 13:24:20,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:20,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964801779] [2020-07-21 13:24:20,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:20,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:24:20,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083770914] [2020-07-21 13:24:20,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:24:20,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:20,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:24:20,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:20,116 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 13:24:20,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:20,166 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 13:24:20,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:20,168 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:24:20,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:20,178 INFO L225 Difference]: With dead ends: 40 [2020-07-21 13:24:20,178 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 13:24:20,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:20,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 13:24:20,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 13:24:20,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:20,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 13:24:20,226 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 13:24:20,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:20,227 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 13:24:20,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:20,228 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 13:24:20,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:24:20,230 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:20,230 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] [2020-07-21 13:24:20,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:20,446 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:20,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:20,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 13:24:20,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:20,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517314333] [2020-07-21 13:24:20,448 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 13:24:20,494 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:20,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:20,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 13:24:20,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:20,533 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 13:24:20,533 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:20,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517314333] [2020-07-21 13:24:20,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:20,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:24:20,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803232970] [2020-07-21 13:24:20,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:24:20,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:20,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:24:20,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:20,538 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 13:24:20,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:20,556 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-07-21 13:24:20,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:20,557 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 13:24:20,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:20,559 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:24:20,559 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:24:20,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:20,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:24:20,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:24:20,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:24:20,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 13:24:20,568 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 20 [2020-07-21 13:24:20,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:20,569 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 13:24:20,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:20,569 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 13:24:20,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:24:20,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:20,571 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] [2020-07-21 13:24:20,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:20,787 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:20,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:20,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 13:24:20,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:20,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531224728] [2020-07-21 13:24:20,790 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 13:24:20,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:20,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:20,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:24:20,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:20,904 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 13:24:20,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:20,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531224728] [2020-07-21 13:24:20,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:20,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 13:24:20,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036444392] [2020-07-21 13:24:20,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:24:20,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:20,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:24:20,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:24:20,907 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 8 states. [2020-07-21 13:24:20,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:20,969 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 13:24:20,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:20,970 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 13:24:20,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:20,972 INFO L225 Difference]: With dead ends: 48 [2020-07-21 13:24:20,972 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 13:24:20,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:20,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 13:24:20,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 13:24:20,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:24:20,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 13:24:20,983 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 13:24:20,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:20,984 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 13:24:20,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:24:20,984 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 13:24:20,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:24:20,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:20,986 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:21,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:21,202 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:21,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:21,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1451784300, now seen corresponding path program 1 times [2020-07-21 13:24:21,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:21,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867908928] [2020-07-21 13:24:21,204 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 13:24:21,240 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:21,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:21,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:24:21,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:21,327 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:24:21,327 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:21,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867908928] [2020-07-21 13:24:21,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:21,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 13:24:21,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791162736] [2020-07-21 13:24:21,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:24:21,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:21,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:24:21,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:24:21,331 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 13:24:21,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:21,378 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-07-21 13:24:21,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:21,379 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 13:24:21,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:21,380 INFO L225 Difference]: With dead ends: 50 [2020-07-21 13:24:21,381 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 13:24:21,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:24:21,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 13:24:21,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 13:24:21,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 13:24:21,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 13:24:21,390 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 13:24:21,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:21,391 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 13:24:21,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:24:21,391 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 13:24:21,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:24:21,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:21,393 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:21,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:21,604 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:21,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:21,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 13:24:21,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:21,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406502036] [2020-07-21 13:24:21,606 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 13:24:21,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:21,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:21,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:24:21,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:21,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:24:21,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:22,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:24:22,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406502036] [2020-07-21 13:24:22,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:22,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 13:24:22,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130795719] [2020-07-21 13:24:22,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:24:22,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:22,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:24:22,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:22,176 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-21 13:24:22,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:22,414 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2020-07-21 13:24:22,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 13:24:22,415 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-21 13:24:22,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:22,416 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:24:22,416 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:24:22,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2020-07-21 13:24:22,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:24:22,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:24:22,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:24:22,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:24:22,419 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 13:24:22,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:22,420 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:24:22,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:24:22,423 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:24:22,423 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:24:22,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:22,627 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:24:22,681 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:24:22,681 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:22,681 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 13:24:22,681 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-21 13:24:22,682 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-21 13:24:22,682 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-21 13:24:22,682 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-21 13:24:22,682 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-21 13:24:22,682 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-21 13:24:22,682 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:22,683 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:24:22,683 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:24:22,683 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:24:22,685 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-21 13:24:22,685 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-21 13:24:22,686 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 13:24:22,686 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-21 13:24:22,686 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-21 13:24:22,686 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 13:24:22,686 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 13:24:22,686 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-21 13:24:22,687 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 13:24:22,687 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 13:24:22,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:24:22 BoogieIcfgContainer [2020-07-21 13:24:22,703 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:24:22,709 INFO L168 Benchmark]: Toolchain (without parser) took 3851.97 ms. Allocated memory was 140.5 MB in the beginning and 234.4 MB in the end (delta: 93.8 MB). Free memory was 104.1 MB in the beginning and 116.2 MB in the end (delta: -12.1 MB). Peak memory consumption was 81.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:22,710 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 140.5 MB. Free memory is still 121.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 13:24:22,713 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.87 ms. Allocated memory is still 140.5 MB. Free memory was 103.7 MB in the beginning and 94.3 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:22,714 INFO L168 Benchmark]: Boogie Preprocessor took 169.30 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 94.3 MB in the beginning and 182.9 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:22,716 INFO L168 Benchmark]: RCFGBuilder took 430.86 ms. Allocated memory is still 204.5 MB. Free memory was 182.9 MB in the beginning and 170.4 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:22,717 INFO L168 Benchmark]: TraceAbstraction took 2958.50 ms. Allocated memory was 204.5 MB in the beginning and 234.4 MB in the end (delta: 29.9 MB). Free memory was 169.4 MB in the beginning and 116.2 MB in the end (delta: 53.2 MB). Peak memory consumption was 83.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:22,727 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 140.5 MB. Free memory is still 121.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.87 ms. Allocated memory is still 140.5 MB. Free memory was 103.7 MB in the beginning and 94.3 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 169.30 ms. Allocated memory was 140.5 MB in the beginning and 204.5 MB in the end (delta: 64.0 MB). Free memory was 94.3 MB in the beginning and 182.9 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 430.86 ms. Allocated memory is still 204.5 MB. Free memory was 182.9 MB in the beginning and 170.4 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2958.50 ms. Allocated memory was 204.5 MB in the beginning and 234.4 MB in the end (delta: 29.9 MB). Free memory was 169.4 MB in the beginning and 116.2 MB in the end (delta: 53.2 MB). Peak memory consumption was 83.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.8s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 141 SDtfs, 18 SDslu, 783 SDs, 0 SdLazy, 187 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 134 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred 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, 6 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 107 NumberOfCodeBlocks, 107 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 128 ConstructedInterpolants, 0 QuantifiedInterpolants, 6098 SizeOfPredicates, 9 NumberOfNonLiveVariables, 240 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 8/12 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 correct! Received shutdown request...