/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/mod3.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:43:18,492 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:43:18,494 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:43:18,508 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:43:18,508 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:43:18,509 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:43:18,511 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:43:18,512 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:43:18,514 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:43:18,515 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:43:18,516 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:43:18,517 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:43:18,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:43:18,518 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:43:18,519 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:43:18,521 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:43:18,521 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:43:18,522 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:43:18,524 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:43:18,526 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:43:18,528 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:43:18,529 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:43:18,530 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:43:18,531 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:43:18,533 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 14:43:18,534 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 14:43:18,534 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 14:43:18,535 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 14:43:18,535 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 14:43:18,536 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 14:43:18,537 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 14:43:18,537 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 14:43:18,538 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 14:43:18,539 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 14:43:18,540 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 14:43:18,540 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 14:43:18,541 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 14:43:18,541 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 14:43:18,541 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:43:18,542 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:43:18,543 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:43:18,544 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 [2020-07-20 14:43:18,563 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:43:18,564 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:43:18,566 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:43:18,567 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:43:18,567 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:43:18,568 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:43:18,568 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:43:18,568 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:43:18,568 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:43:18,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:43:18,569 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:43:18,569 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:43:18,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:43:18,570 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:43:18,570 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:43:18,571 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:43:18,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:43:18,571 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:43:18,571 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:43:18,571 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:43:18,572 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:43:18,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:43:18,572 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:43:18,573 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:43:18,573 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:43:18,573 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:43:18,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:43:18,574 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:43:18,574 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:43:18,574 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 -> 4 [2020-07-20 14:43:18,880 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:43:18,896 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:43:18,900 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:43:18,902 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:43:18,902 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:43:18,903 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/mod3.c.v+cfa-reducer.c [2020-07-20 14:43:18,983 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14504f6a6/a87b2f4512704705904034659f2bcc6e/FLAG73864af5b [2020-07-20 14:43:19,508 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:43:19,512 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/mod3.c.v+cfa-reducer.c [2020-07-20 14:43:19,520 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14504f6a6/a87b2f4512704705904034659f2bcc6e/FLAG73864af5b [2020-07-20 14:43:19,890 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/14504f6a6/a87b2f4512704705904034659f2bcc6e [2020-07-20 14:43:19,903 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:43:19,907 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:43:19,908 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:43:19,908 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:43:19,912 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:43:19,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:43:19" (1/1) ... [2020-07-20 14:43:19,917 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a8873d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:19, skipping insertion in model container [2020-07-20 14:43:19,917 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:43:19" (1/1) ... [2020-07-20 14:43:19,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:43:19,947 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:43:20,127 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:43:20,133 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:43:20,154 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:43:20,170 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:43:20,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20 WrapperNode [2020-07-20 14:43:20,171 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:43:20,172 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:43:20,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:43:20,173 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:43:20,188 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,292 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,293 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,298 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,301 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,307 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (1/1) ... [2020-07-20 14:43:20,313 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:43:20,313 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:43:20,314 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:43:20,314 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:43:20,315 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (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 [2020-07-20 14:43:20,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:43:20,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:43:20,384 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:43:20,384 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:43:20,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:43:20,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:43:20,386 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:43:20,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:43:20,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:43:20,624 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:43:20,624 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 14:43:20,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:43:20 BoogieIcfgContainer [2020-07-20 14:43:20,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:43:20,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:43:20,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:43:20,634 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:43:20,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:43:19" (1/3) ... [2020-07-20 14:43:20,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6093473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:43:20, skipping insertion in model container [2020-07-20 14:43:20,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:43:20" (2/3) ... [2020-07-20 14:43:20,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6093473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:43:20, skipping insertion in model container [2020-07-20 14:43:20,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:43:20" (3/3) ... [2020-07-20 14:43:20,638 INFO L109 eAbstractionObserver]: Analyzing ICFG mod3.c.v+cfa-reducer.c [2020-07-20 14:43:20,650 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:43:20,658 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:43:20,674 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:43:20,700 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:43:20,700 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:43:20,700 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:43:20,700 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:43:20,701 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:43:20,701 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:43:20,701 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:43:20,701 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:43:20,720 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 14:43:20,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 14:43:20,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:43:20,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:43:20,727 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:43:20,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:43:20,735 INFO L82 PathProgramCache]: Analyzing trace with hash 964689295, now seen corresponding path program 1 times [2020-07-20 14:43:20,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:43:20,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [552928393] [2020-07-20 14:43:20,746 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 14:43:20,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:43:20,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:43:20,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:43:20,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:43:20,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:43:20,920 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:43:20,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [552928393] [2020-07-20 14:43:20,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:43:20,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:43:20,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569033158] [2020-07-20 14:43:20,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:43:20,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:43:20,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:43:20,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:43:20,949 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-07-20 14:43:21,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:43:21,007 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2020-07-20 14:43:21,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:43:21,010 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-20 14:43:21,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:43:21,024 INFO L225 Difference]: With dead ends: 34 [2020-07-20 14:43:21,024 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 14:43:21,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:43:21,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 14:43:21,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2020-07-20 14:43:21,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 14:43:21,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2020-07-20 14:43:21,069 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 11 [2020-07-20 14:43:21,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:43:21,070 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2020-07-20 14:43:21,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:43:21,070 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2020-07-20 14:43:21,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 14:43:21,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:43:21,071 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:43:21,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:43:21,286 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:43:21,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:43:21,287 INFO L82 PathProgramCache]: Analyzing trace with hash 2096975293, now seen corresponding path program 1 times [2020-07-20 14:43:21,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:43:21,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642907971] [2020-07-20 14:43:21,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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