/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/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 12:55:50,547 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 12:55:50,550 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 12:55:50,568 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 12:55:50,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 12:55:50,570 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 12:55:50,572 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 12:55:50,582 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 12:55:50,587 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 12:55:50,590 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 12:55:50,592 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 12:55:50,593 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 12:55:50,593 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 12:55:50,595 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 12:55:50,597 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 12:55:50,598 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 12:55:50,599 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 12:55:50,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 12:55:50,601 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 12:55:50,603 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 12:55:50,604 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 12:55:50,605 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 12:55:50,606 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 12:55:50,607 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 12:55:50,609 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 12:55:50,616 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 12:55:50,617 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 12:55:50,618 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 12:55:50,619 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 12:55:50,632 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 12:55:50,633 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 12:55:50,634 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 12:55:50,634 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 12:55:50,634 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 12:55:50,635 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 12:55:50,635 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 12:55:50,635 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 12:55:50,635 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 12:55:50,635 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 12:55:50,636 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 12:55:50,636 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 12:55:50,636 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 12:55:50,636 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 12:55:50,636 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 12:55:50,637 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 12:55:50,637 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 12:55:50,637 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 12:55:50,637 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 12:55:50,637 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 12:55:50,638 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 12:55:50,638 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 12:55:50,638 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 12:55:50,638 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 12:55:50,638 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 12:55:50,639 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 12:55:50,639 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:50,639 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 12:55:50,639 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 12:55:50,639 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 12:55:50,913 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 12:55:50,930 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 12:55:50,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 12:55:50,935 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 12:55:50,938 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 12:55:50,939 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 12:55:51,005 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4278ab202/bd6ea5438ab44c799f7538280d293bad/FLAG9291b2f70 [2020-07-21 12:55:51,493 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 12:55:51,495 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 12:55:51,503 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4278ab202/bd6ea5438ab44c799f7538280d293bad/FLAG9291b2f70 [2020-07-21 12:55:51,875 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4278ab202/bd6ea5438ab44c799f7538280d293bad [2020-07-21 12:55:51,884 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 12:55:51,887 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 12:55:51,889 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 12:55:51,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 12:55:51,893 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 12:55:51,894 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:55:51" (1/1) ... [2020-07-21 12:55:51,898 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43933f30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:51, skipping insertion in model container [2020-07-21 12:55:51,899 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:55:51" (1/1) ... [2020-07-21 12:55:51,908 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 12:55:51,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 12:55:52,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:55:52,109 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 12:55:52,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 12:55:52,138 INFO L208 MainTranslator]: Completed translation [2020-07-21 12:55:52,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52 WrapperNode [2020-07-21 12:55:52,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 12:55:52,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 12:55:52,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 12:55:52,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 12:55:52,151 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,236 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,241 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,246 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,252 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (1/1) ... [2020-07-21 12:55:52,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 12:55:52,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 12:55:52,261 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 12:55:52,261 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 12:55:52,262 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (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 12:55:52,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 12:55:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 12:55:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 12:55:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-21 12:55:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 12:55:52,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 12:55:52,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 12:55:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 12:55:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-21 12:55:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 12:55:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 12:55:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 12:55:52,524 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 12:55:52,524 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 12:55:52,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:55:52 BoogieIcfgContainer [2020-07-21 12:55:52,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 12:55:52,529 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 12:55:52,529 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 12:55:52,532 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 12:55:52,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:55:51" (1/3) ... [2020-07-21 12:55:52,533 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64c2a1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:55:52, skipping insertion in model container [2020-07-21 12:55:52,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:55:52" (2/3) ... [2020-07-21 12:55:52,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64c2a1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:55:52, skipping insertion in model container [2020-07-21 12:55:52,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:55:52" (3/3) ... [2020-07-21 12:55:52,536 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-21 12:55:52,546 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 12:55:52,554 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 12:55:52,568 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 12:55:52,610 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 12:55:52,610 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 12:55:52,611 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 12:55:52,611 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 12:55:52,611 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 12:55:52,611 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 12:55:52,612 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 12:55:52,612 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 12:55:52,636 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-21 12:55:52,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 12:55:52,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:52,645 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:52,646 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:52,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:52,654 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-21 12:55:52,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:52,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001414850] [2020-07-21 12:55:52,664 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 12:55:52,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:52,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:52,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 12:55:52,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:52,796 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 12:55:52,796 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:52,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001414850] [2020-07-21 12:55:52,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:52,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 12:55:52,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786539209] [2020-07-21 12:55:52,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 12:55:52,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:52,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 12:55:52,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 12:55:52,822 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 3 states. [2020-07-21 12:55:52,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:52,885 INFO L93 Difference]: Finished difference Result 55 states and 73 transitions. [2020-07-21 12:55:52,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 12:55:52,887 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 12:55:52,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:52,900 INFO L225 Difference]: With dead ends: 55 [2020-07-21 12:55:52,900 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 12:55:52,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 12:55:52,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 12:55:52,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2020-07-21 12:55:52,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 12:55:52,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2020-07-21 12:55:52,953 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 17 [2020-07-21 12:55:52,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:52,954 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2020-07-21 12:55:52,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 12:55:52,954 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2020-07-21 12:55:52,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 12:55:52,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:52,960 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:53,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:53,174 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:53,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:53,175 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-21 12:55:53,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:53,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084214777] [2020-07-21 12:55:53,176 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 12:55:53,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:53,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:53,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 12:55:53,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:53,249 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 12:55:53,249 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:53,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084214777] [2020-07-21 12:55:53,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:53,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 12:55:53,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265154760] [2020-07-21 12:55:53,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 12:55:53,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:53,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 12:55:53,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:53,254 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand 5 states. [2020-07-21 12:55:53,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:53,337 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-07-21 12:55:53,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:53,338 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 12:55:53,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:53,340 INFO L225 Difference]: With dead ends: 47 [2020-07-21 12:55:53,340 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 12:55:53,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 12:55:53,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 12:55:53,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 12:55:53,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 12:55:53,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-21 12:55:53,350 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-21 12:55:53,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:53,351 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-21 12:55:53,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 12:55:53,351 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-21 12:55:53,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 12:55:53,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:53,352 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:53,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:53,567 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:53,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:53,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-21 12:55:53,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:53,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792943871] [2020-07-21 12:55:53,570 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 12:55:53,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:53,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:53,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 12:55:53,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:53,641 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 12:55:53,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:53,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792943871] [2020-07-21 12:55:53,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:53,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 12:55:53,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154707078] [2020-07-21 12:55:53,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 12:55:53,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:53,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 12:55:53,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:53,644 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-21 12:55:53,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:53,703 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-21 12:55:53,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:53,703 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 12:55:53,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:53,705 INFO L225 Difference]: With dead ends: 46 [2020-07-21 12:55:53,705 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 12:55:53,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 12:55:53,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 12:55:53,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 12:55:53,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 12:55:53,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-21 12:55:53,713 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-21 12:55:53,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:53,713 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-21 12:55:53,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 12:55:53,714 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-21 12:55:53,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 12:55:53,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:53,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:53,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:53,929 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:53,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:53,930 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-21 12:55:53,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:53,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704338364] [2020-07-21 12:55:53,932 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 12:55:53,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:55:53,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:53,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 12:55:53,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:54,004 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 12:55:54,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 12:55:54,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704338364] [2020-07-21 12:55:54,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 12:55:54,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 12:55:54,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644191182] [2020-07-21 12:55:54,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 12:55:54,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:54,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 12:55:54,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 12:55:54,007 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-21 12:55:54,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:54,050 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 12:55:54,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:54,051 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 12:55:54,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:54,052 INFO L225 Difference]: With dead ends: 40 [2020-07-21 12:55:54,053 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 12:55:54,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 12:55:54,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 12:55:54,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 12:55:54,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 12:55:54,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 12:55:54,060 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-21 12:55:54,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:54,060 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 12:55:54,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 12:55:54,061 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 12:55:54,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 12:55:54,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:54,062 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 12:55:54,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:54,276 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:54,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:54,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-21 12:55:54,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:54,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941039250] [2020-07-21 12:55:54,279 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 12:55:54,321 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:54,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:54,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 12:55:54,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:54,374 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 12:55:54,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:54,494 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 12:55:54,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941039250] [2020-07-21 12:55:54,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 12:55:54,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2020-07-21 12:55:54,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047110257] [2020-07-21 12:55:54,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 12:55:54,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:54,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 12:55:54,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 12:55:54,499 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-07-21 12:55:54,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:54,544 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 12:55:54,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 12:55:54,545 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-07-21 12:55:54,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:54,546 INFO L225 Difference]: With dead ends: 44 [2020-07-21 12:55:54,547 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 12:55:54,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 12:55:54,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 12:55:54,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 12:55:54,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 12:55:54,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 12:55:54,563 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-21 12:55:54,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:54,563 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 12:55:54,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 12:55:54,563 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 12:55:54,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 12:55:54,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:54,567 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:54,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:54,782 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:54,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:54,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-21 12:55:54,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:54,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363065018] [2020-07-21 12:55:54,786 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 12:55:54,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:54,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:54,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 12:55:54,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:54,902 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:55:54,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:55,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:55:55,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363065018] [2020-07-21 12:55:55,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:55:55,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 12:55:55,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65171318] [2020-07-21 12:55:55,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 12:55:55,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:55,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 12:55:55,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-21 12:55:55,338 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-07-21 12:55:55,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:55,449 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-07-21 12:55:55,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 12:55:55,450 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-21 12:55:55,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:55,451 INFO L225 Difference]: With dead ends: 46 [2020-07-21 12:55:55,451 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 12:55:55,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 12:55:55,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 12:55:55,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 12:55:55,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 12:55:55,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-21 12:55:55,458 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-21 12:55:55,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:55,459 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-21 12:55:55,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 12:55:55,459 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-21 12:55:55,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 12:55:55,460 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:55,460 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:55,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:55,676 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:55,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:55,677 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-21 12:55:55,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:55,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195902116] [2020-07-21 12:55:55,679 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:55,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 12:55:55,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:55,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 12:55:55,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:55,834 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:55:55,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:55,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195902116] [2020-07-21 12:55:55,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 12:55:55,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 12:55:55,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418989338] [2020-07-21 12:55:55,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 12:55:55,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:55,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 12:55:55,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 12:55:55,927 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2020-07-21 12:55:56,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:55:56,070 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 12:55:56,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 12:55:56,071 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-07-21 12:55:56,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:55:56,072 INFO L225 Difference]: With dead ends: 48 [2020-07-21 12:55:56,072 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 12:55:56,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-21 12:55:56,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 12:55:56,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 12:55:56,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 12:55:56,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-21 12:55:56,079 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-21 12:55:56,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:55:56,079 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-21 12:55:56,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 12:55:56,080 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-21 12:55:56,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 12:55:56,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:55:56,081 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:55:56,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:56,295 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:55:56,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:55:56,296 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-21 12:55:56,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:55:56,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [734451506] [2020-07-21 12:55:56,297 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:55:56,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:55:56,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:55:56,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 12:55:56,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:55:56,525 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:55:56,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:55:56,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [734451506] [2020-07-21 12:55:56,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 12:55:56,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 12:55:56,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993212409] [2020-07-21 12:55:56,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 12:55:56,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:55:56,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 12:55:56,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 12:55:56,663 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-21 12:56:21,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 12:56:21,525 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-21 12:56:21,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 12:56:21,532 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 12:56:21,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 12:56:21,533 INFO L225 Difference]: With dead ends: 52 [2020-07-21 12:56:21,533 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 12:56:21,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=26, Invalid=105, Unknown=1, NotChecked=0, Total=132 [2020-07-21 12:56:21,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 12:56:21,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 12:56:21,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 12:56:21,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 12:56:21,540 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-21 12:56:21,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 12:56:21,541 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 12:56:21,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 12:56:21,541 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 12:56:21,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 12:56:21,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 12:56:21,542 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 12:56:21,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:21,743 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 12:56:21,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 12:56:21,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-21 12:56:21,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 12:56:21,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521263276] [2020-07-21 12:56:21,745 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 12:56:21,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 12:56:21,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 12:56:21,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 12:56:21,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 12:56:22,066 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:22,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 12:56:22,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:22,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 12:56:25,624 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 12:56:26,559 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 12:56:27,813 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 12:56:29,507 WARN L193 SmtUtils]: Spent 324.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 12:56:31,986 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 12:56:37,551 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 12:56:44,928 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-21 12:56:51,619 WARN L193 SmtUtils]: Spent 960.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 12:56:51,796 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 12:56:51,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521263276] [2020-07-21 12:56:51,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 12:56:51,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-21 12:56:51,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727775398] [2020-07-21 12:56:51,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 12:56:51,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 12:56:51,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 12:56:51,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=547, Unknown=4, NotChecked=0, Total=650 [2020-07-21 12:56:51,799 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 26 states. [2020-07-21 12:57:36,756 WARN L193 SmtUtils]: Spent 18.15 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 12:58:13,415 WARN L193 SmtUtils]: Spent 6.56 s on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 12:58:35,632 WARN L193 SmtUtils]: Spent 3.94 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 12:59:23,318 WARN L193 SmtUtils]: Spent 14.31 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 13:00:24,007 WARN L193 SmtUtils]: Spent 33.41 s on a formula simplification that was a NOOP. DAG size: 38 [2020-07-21 13:00:35,731 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 c_gcd_test_~a)) (.cse1 (and (not (= 0 (mod |c_gcd_test_#in~a| (div |c_gcd_test_#in~a| 7)))) (= 0 (mod |c_gcd_test_#in~a| 7))))) (and (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (not (= (* 5 c_gcd_test_~b) .cse0)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (not (= (* 3 c_gcd_test_~b) .cse0)) .cse1) (or (= 0 (mod |c_gcd_test_#in~a| |c_gcd_test_#res|)) .cse1))) is different from true [2020-07-21 13:01:00,246 WARN L193 SmtUtils]: Spent 6.02 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 13:01:02,946 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a))) (.cse0 (* 2 c_gcd_test_~a)) (.cse1 (and (not (= 0 (mod |c_gcd_test_#in~a| (div |c_gcd_test_#in~a| 7)))) (= 0 (mod |c_gcd_test_#in~a| 7))))) (and (or (= (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)) 0) (not (= (* 5 c_gcd_test_~b) .cse0)) .cse1) (or (not (= c_gcd_test_~a c_gcd_test_~b)) .cse2 .cse1) (or (not (= .cse0 c_gcd_test_~b)) .cse2 .cse1) (or (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (not (= (* 3 c_gcd_test_~b) .cse0)) .cse1))) is different from false [2020-07-21 13:01:29,397 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-21 13:01:44,624 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-21 13:02:08,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:02:08,945 INFO L93 Difference]: Finished difference Result 76 states and 99 transitions. [2020-07-21 13:02:08,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 13:02:08,962 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2020-07-21 13:02:08,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:02:08,963 INFO L225 Difference]: With dead ends: 76 [2020-07-21 13:02:08,963 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:02:08,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 254.5s TimeCoverageRelationStatistics Valid=229, Invalid=1092, Unknown=19, NotChecked=142, Total=1482 [2020-07-21 13:02:08,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:02:08,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-07-21 13:02:08,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:02:08,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2020-07-21 13:02:08,979 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 29 [2020-07-21 13:02:08,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:02:08,980 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2020-07-21 13:02:08,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 13:02:08,980 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2020-07-21 13:02:08,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 13:02:08,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:02:08,982 INFO L422 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:02:09,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:09,184 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:02:09,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:02:09,184 INFO L82 PathProgramCache]: Analyzing trace with hash 808871355, now seen corresponding path program 5 times [2020-07-21 13:02:09,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:02:09,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571310502] [2020-07-21 13:02:09,186 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:09,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:02:09,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:02:09,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:02:09,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:02:09,710 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 13:02:12,357 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:02:12,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:02:13,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571310502] [2020-07-21 13:02:13,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 13:02:13,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 13:02:13,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349031035] [2020-07-21 13:02:13,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:02:13,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:02:13,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:02:13,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=71, Unknown=1, NotChecked=0, Total=90 [2020-07-21 13:02:13,259 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand 9 states. [2020-07-21 13:02:24,495 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2020-07-21 13:02:25,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:02:25,069 INFO L93 Difference]: Finished difference Result 98 states and 126 transitions. [2020-07-21 13:02:25,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:02:25,079 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2020-07-21 13:02:25,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:02:25,080 INFO L225 Difference]: With dead ends: 98 [2020-07-21 13:02:25,080 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:02:25,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=22, Invalid=86, Unknown=2, NotChecked=0, Total=110 [2020-07-21 13:02:25,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:02:25,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-21 13:02:25,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 13:02:25,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2020-07-21 13:02:25,099 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 33 [2020-07-21 13:02:25,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:02:25,099 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2020-07-21 13:02:25,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:02:25,100 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2020-07-21 13:02:25,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 13:02:25,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:02:25,101 INFO L422 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:02:25,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:25,315 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:02:25,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:02:25,316 INFO L82 PathProgramCache]: Analyzing trace with hash 190781115, now seen corresponding path program 6 times [2020-07-21 13:02:25,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:02:25,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342955117] [2020-07-21 13:02:25,317 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:25,358 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:02:25,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:02:25,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:02:25,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:02:25,383 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-21 13:02:25,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:02:25,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342955117] [2020-07-21 13:02:25,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:02:25,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:02:25,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816195898] [2020-07-21 13:02:25,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:02:25,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:02:25,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:02:25,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:02:25,385 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand 3 states. [2020-07-21 13:02:25,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:02:25,432 INFO L93 Difference]: Finished difference Result 86 states and 105 transitions. [2020-07-21 13:02:25,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:02:25,436 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 33 [2020-07-21 13:02:25,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:02:25,441 INFO L225 Difference]: With dead ends: 86 [2020-07-21 13:02:25,442 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 13:02:25,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 31 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 13:02:25,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 13:02:25,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-21 13:02:25,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 13:02:25,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2020-07-21 13:02:25,472 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 33 [2020-07-21 13:02:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:02:25,473 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2020-07-21 13:02:25,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:02:25,473 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2020-07-21 13:02:25,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 13:02:25,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:02:25,478 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 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 13:02:25,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:25,694 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:02:25,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:02:25,695 INFO L82 PathProgramCache]: Analyzing trace with hash -825201876, now seen corresponding path program 1 times [2020-07-21 13:02:25,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:02:25,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962712786] [2020-07-21 13:02:25,696 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:02:25,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:02:25,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:02:25,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 13:02:25,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:02:26,017 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-21 13:02:27,827 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 13:02:28,847 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-21 13:02:29,375 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:02:29,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:02:29,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:29,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:02:33,740 WARN L193 SmtUtils]: Spent 2.43 s on a formula simplification. DAG size of input: 27 DAG size of output: 5 [2020-07-21 13:02:36,411 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-07-21 13:02:42,360 WARN L193 SmtUtils]: Spent 908.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 13:02:42,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:03:04,607 WARN L193 SmtUtils]: Spent 7.28 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 13:03:35,321 WARN L193 SmtUtils]: Spent 4.71 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 13:03:56,010 WARN L193 SmtUtils]: Spent 9.39 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 13:04:14,729 WARN L193 SmtUtils]: Spent 6.61 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 13:04:27,333 WARN L193 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 13:04:55,034 WARN L193 SmtUtils]: Spent 8.79 s on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:05:20,932 WARN L193 SmtUtils]: Spent 6.31 s on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 13:05:43,837 WARN L193 SmtUtils]: Spent 6.15 s on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 13:05:45,949 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= 0 (mod (* |c_gcd_test_#in~a| 5) (- 7)))))) (and (or .cse0 (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (+ |c_gcd_test_#in~a| (* (div (* |c_gcd_test_#in~a| (- 2)) (- 7)) (- 3))))) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7))))))) (or .cse0 (= 0 (mod |c_gcd_test_#in~a| 7)) (forall ((v_prenex_2 Int)) (= (mod v_prenex_2 (+ |c_gcd_test_#in~a| (* (div (* |c_gcd_test_#in~a| (- 2)) (- 7)) (- 3)))) 0))))) is different from true [2020-07-21 13:05:45,972 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:05:45,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962712786] [2020-07-21 13:05:45,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:05:45,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 27 [2020-07-21 13:05:45,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477445644] [2020-07-21 13:05:45,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 13:05:45,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:05:45,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 13:05:45,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=578, Unknown=19, NotChecked=48, Total=702 [2020-07-21 13:05:45,975 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand 27 states. [2020-07-21 13:06:07,888 WARN L193 SmtUtils]: Spent 13.71 s on a formula simplification. DAG size of input: 35 DAG size of output: 28 [2020-07-21 13:07:06,812 WARN L193 SmtUtils]: Spent 41.95 s on a formula simplification. DAG size of input: 47 DAG size of output: 43 [2020-07-21 13:07:18,686 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 5 [2020-07-21 13:07:27,384 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= c_gcd_test_~b 0))) (.cse2 (not (= (* 5 c_gcd_test_~b) (* 2 c_gcd_test_~a)))) (.cse1 (= 0 (mod |c_gcd_test_#in~a| 7)))) (and (= (+ c_gcd_test_~b c_gcd_test_~a) |c_gcd_test_#in~a|) (or .cse0 (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 c_gcd_test_~a))) .cse1) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))) (= 0 (mod v_main_~y~0_BEFORE_CALL_14 c_gcd_test_~a)))) .cse0) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a))) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))))) .cse2) (or (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 (+ (* c_gcd_test_~b (- 2)) c_gcd_test_~a)))) .cse2 .cse1))) is different from true [2020-07-21 13:07:45,769 WARN L193 SmtUtils]: Spent 14.38 s on a formula simplification. DAG size of input: 35 DAG size of output: 28 [2020-07-21 13:07:52,610 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse0 (not (= c_gcd_test_~b 0))) (.cse1 (= 0 (mod |c_gcd_test_#in~a| 7))) (.cse2 (not (= (* 3 c_gcd_test_~b) (* 2 c_gcd_test_~a))))) (and (or .cse0 (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 c_gcd_test_~a))) .cse1) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))) (= 0 (mod v_main_~y~0_BEFORE_CALL_14 c_gcd_test_~a)))) .cse0) (or (forall ((v_prenex_2 Int)) (= 0 (mod v_prenex_2 (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a)))) .cse2 .cse1) (= (+ (* 2 c_gcd_test_~b) c_gcd_test_~a) |c_gcd_test_#in~a|) (or (forall ((v_main_~y~0_BEFORE_CALL_14 Int)) (or (= (mod v_main_~y~0_BEFORE_CALL_14 (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a)) 0) (not (= 0 (mod v_main_~y~0_BEFORE_CALL_14 (div |c_gcd_test_#in~a| 7)))))) .cse2))) is different from true [2020-07-21 13:08:03,130 WARN L193 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 31 DAG size of output: 7 [2020-07-21 13:08:47,178 WARN L193 SmtUtils]: Spent 32.62 s on a formula simplification. DAG size of input: 35 DAG size of output: 34 [2020-07-21 13:09:12,882 WARN L193 SmtUtils]: Spent 15.24 s on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-21 13:10:12,302 WARN L193 SmtUtils]: Spent 45.97 s on a formula simplification. DAG size of input: 35 DAG size of output: 34