/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -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 [2020-07-20 21:07:55,291 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:07:55,293 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:07:55,305 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:07:55,305 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:07:55,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:07:55,308 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:07:55,310 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:07:55,311 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:07:55,312 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:07:55,313 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:07:55,314 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:07:55,314 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:07:55,315 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:07:55,316 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:07:55,317 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:07:55,318 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:07:55,319 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:07:55,321 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:07:55,323 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:07:55,324 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:07:55,326 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:07:55,327 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:07:55,327 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:07:55,333 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:07:55,341 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:07:55,342 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:07:55,342 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:07:55,343 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:07:55,358 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:07:55,358 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:07:55,359 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:07:55,360 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:07:55,360 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:07:55,360 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:07:55,360 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:07:55,360 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:07:55,361 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:07:55,361 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:07:55,361 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:07:55,361 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:07:55,361 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:07:55,362 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:07:55,362 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:07:55,362 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:07:55,362 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:07:55,362 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:07:55,363 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:07:55,363 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:07:55,363 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:07:55,363 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:07:55,363 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:07:55,364 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:07:55,365 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:07:55,646 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:07:55,658 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:07:55,662 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:07:55,663 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:07:55,663 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:07:55,664 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 21:07:55,750 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340e7dd29/e490b4dd1a5b4e6a8da15eb493c3e657/FLAGedc7e99a1 [2020-07-20 21:07:56,182 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:07:56,184 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-20 21:07:56,189 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340e7dd29/e490b4dd1a5b4e6a8da15eb493c3e657/FLAGedc7e99a1 [2020-07-20 21:07:56,600 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340e7dd29/e490b4dd1a5b4e6a8da15eb493c3e657 [2020-07-20 21:07:56,613 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:07:56,618 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:07:56,622 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:07:56,622 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:07:56,626 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:07:56,627 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,630 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6533c7be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56, skipping insertion in model container [2020-07-20 21:07:56,631 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,640 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:07:56,663 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:07:56,843 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:07:56,847 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:07:56,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:07:56,882 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:07:56,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56 WrapperNode [2020-07-20 21:07:56,882 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:07:56,883 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:07:56,883 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:07:56,883 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:07:56,897 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,903 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,904 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:56,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:57,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:57,001 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... [2020-07-20 21:07:57,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:07:57,008 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:07:57,009 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:07:57,009 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:07:57,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:07:57,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:07:57,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:07:57,074 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 21:07:57,074 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-20 21:07:57,074 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:07:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:07:57,274 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:07:57,274 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 21:07:57,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:07:57 BoogieIcfgContainer [2020-07-20 21:07:57,278 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:07:57,280 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:07:57,280 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:07:57,283 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:07:57,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:07:56" (1/3) ... [2020-07-20 21:07:57,284 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77107a7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:07:57, skipping insertion in model container [2020-07-20 21:07:57,284 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:07:56" (2/3) ... [2020-07-20 21:07:57,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77107a7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:07:57, skipping insertion in model container [2020-07-20 21:07:57,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:07:57" (3/3) ... [2020-07-20 21:07:57,287 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-20 21:07:57,297 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:07:57,305 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:07:57,319 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:07:57,342 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:07:57,342 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:07:57,342 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:07:57,342 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:07:57,342 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:07:57,342 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:07:57,343 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:07:57,343 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:07:57,359 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-20 21:07:57,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:07:57,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:57,367 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:07:57,368 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:57,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:57,374 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-20 21:07:57,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:57,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [734884412] [2020-07-20 21:07:57,384 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:57,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:07:57,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:57,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:07:57,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:57,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:57,570 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:07:57,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [734884412] [2020-07-20 21:07:57,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:07:57,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:07:57,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121240317] [2020-07-20 21:07:57,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:07:57,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:57,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:07:57,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:07:57,603 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-20 21:07:57,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:07:57,760 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-20 21:07:57,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:07:57,762 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 21:07:57,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:07:57,773 INFO L225 Difference]: With dead ends: 60 [2020-07-20 21:07:57,774 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:07:57,778 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 [2020-07-20 21:07:57,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:07:57,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 21:07:57,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 21:07:57,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-20 21:07:57,826 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-20 21:07:57,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:07:57,827 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-20 21:07:57,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:07:57,828 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-20 21:07:57,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:07:57,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:57,830 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:07:58,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:58,045 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:58,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:58,046 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-20 21:07:58,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:58,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012769806] [2020-07-20 21:07:58,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:58,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:07:58,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:58,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:07:58,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:58,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:58,138 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:07:58,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012769806] [2020-07-20 21:07:58,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:07:58,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:07:58,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566774837] [2020-07-20 21:07:58,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:07:58,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:58,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:07:58,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:07:58,143 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-20 21:07:58,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:07:58,196 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 21:07:58,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:07:58,197 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 21:07:58,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:07:58,198 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:07:58,198 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:07:58,200 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 [2020-07-20 21:07:58,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:07:58,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 21:07:58,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 21:07:58,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-20 21:07:58,207 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-20 21:07:58,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:07:58,208 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-20 21:07:58,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:07:58,208 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-20 21:07:58,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:07:58,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:58,210 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:07:58,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:58,423 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:58,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:58,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-20 21:07:58,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:58,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215881436] [2020-07-20 21:07:58,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:07:58,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:07:58,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:58,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:07:58,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:58,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:58,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:07:58,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215881436] [2020-07-20 21:07:58,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:07:58,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:07:58,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272027835] [2020-07-20 21:07:58,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:07:58,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:58,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:07:58,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:07:58,511 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-20 21:07:58,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:07:58,566 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-20 21:07:58,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:07:58,567 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 21:07:58,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:07:58,568 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:07:58,568 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:07:58,569 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 [2020-07-20 21:07:58,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:07:58,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-20 21:07:58,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 21:07:58,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-20 21:07:58,576 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-20 21:07:58,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:07:58,577 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-20 21:07:58,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:07:58,577 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-20 21:07:58,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:07:58,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:58,578 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:07:58,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:58,792 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:58,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:58,792 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-20 21:07:58,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:58,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245146480] [2020-07-20 21:07:58,793 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:07:58,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:07:58,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:58,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:07:58,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:58,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:58,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:07:58,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245146480] [2020-07-20 21:07:58,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:07:58,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:07:58,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776137437] [2020-07-20 21:07:58,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:07:58,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:58,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:07:58,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:07:58,859 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-20 21:07:58,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:07:58,920 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 21:07:58,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:07:58,923 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-20 21:07:58,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:07:58,924 INFO L225 Difference]: With dead ends: 40 [2020-07-20 21:07:58,925 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 21:07:58,926 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 [2020-07-20 21:07:58,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 21:07:58,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 21:07:58,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 21:07:58,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-20 21:07:58,940 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-20 21:07:58,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:07:58,942 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-20 21:07:58,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:07:58,942 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-20 21:07:58,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:07:58,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:58,944 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] [2020-07-20 21:07:59,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:59,159 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:59,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:59,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-20 21:07:59,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:59,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710041506] [2020-07-20 21:07:59,161 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:07:59,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 21:07:59,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:59,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:07:59,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:59,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:59,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:07:59,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:59,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710041506] [2020-07-20 21:07:59,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-20 21:07:59,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2020-07-20 21:07:59,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703612082] [2020-07-20 21:07:59,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:07:59,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:59,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:07:59,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 21:07:59,359 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-07-20 21:07:59,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:07:59,397 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-20 21:07:59,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:07:59,397 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-07-20 21:07:59,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:07:59,398 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:07:59,398 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 21:07:59,399 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 [2020-07-20 21:07:59,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 21:07:59,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 21:07:59,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 21:07:59,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 21:07:59,405 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-20 21:07:59,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:07:59,406 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 21:07:59,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:07:59,406 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 21:07:59,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 21:07:59,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:07:59,407 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] [2020-07-20 21:07:59,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:07:59,621 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:07:59,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:07:59,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-20 21:07:59,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:07:59,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270599229] [2020-07-20 21:07:59,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:07:59,659 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:07:59,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:07:59,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:07:59,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:07:59,765 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:59,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:07:59,933 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:07:59,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270599229] [2020-07-20 21:07:59,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:07:59,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-20 21:07:59,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236873029] [2020-07-20 21:07:59,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:07:59,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:07:59,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:07:59,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:07:59,941 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-07-20 21:08:00,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:00,055 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-07-20 21:08:00,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:08:00,056 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-20 21:08:00,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:00,058 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:08:00,058 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 21:08:00,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:08:00,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 21:08:00,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 21:08:00,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:08:00,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-20 21:08:00,072 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-20 21:08:00,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:00,072 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-20 21:08:00,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:08:00,072 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-20 21:08:00,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:08:00,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:00,074 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] [2020-07-20 21:08:00,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:00,288 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:00,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-20 21:08:00,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:00,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769398039] [2020-07-20 21:08:00,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:08:00,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:08:00,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:00,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 21:08:00,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:00,450 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:08:00,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:08:00,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769398039] [2020-07-20 21:08:00,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 21:08:00,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-20 21:08:00,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824073681] [2020-07-20 21:08:00,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 21:08:00,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:00,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 21:08:00,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 21:08:00,554 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2020-07-20 21:08:00,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:00,686 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 21:08:00,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:08:00,687 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-07-20 21:08:00,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:00,688 INFO L225 Difference]: With dead ends: 48 [2020-07-20 21:08:00,688 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:08:00,689 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 [2020-07-20 21:08:00,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:08:00,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 21:08:00,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 21:08:00,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-20 21:08:00,695 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-20 21:08:00,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:00,695 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-20 21:08:00,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 21:08:00,696 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-20 21:08:00,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:08:00,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:00,697 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] [2020-07-20 21:08:00,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:00,899 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:00,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:00,900 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-20 21:08:00,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:00,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043314076] [2020-07-20 21:08:00,901 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:08:00,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:08:00,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:00,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:08:00,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:06,642 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:08:06,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:08:06,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043314076] [2020-07-20 21:08:06,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 21:08:06,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 21:08:06,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528051457] [2020-07-20 21:08:06,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:08:06,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:06,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:08:06,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=70, Unknown=2, NotChecked=0, Total=90 [2020-07-20 21:08:06,781 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-20 21:08:19,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:08:19,459 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-20 21:08:19,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:08:19,462 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:08:19,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:08:19,463 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:08:19,464 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 21:08:19,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=26, Invalid=104, Unknown=2, NotChecked=0, Total=132 [2020-07-20 21:08:19,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 21:08:19,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 21:08:19,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:08:19,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 21:08:19,471 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-20 21:08:19,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:08:19,472 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 21:08:19,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:08:19,472 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 21:08:19,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 21:08:19,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:08:19,473 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] [2020-07-20 21:08:19,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:08:19,675 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:08:19,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:08:19,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-20 21:08:19,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:08:19,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227370736] [2020-07-20 21:08:19,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:08:19,754 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:08:19,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:08:19,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:08:19,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:08:20,023 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:08:20,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:08:20,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:08:20,309 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 5 [2020-07-20 21:08:21,708 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 21:08:22,405 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 21:08:23,627 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 21:08:25,629 WARN L193 SmtUtils]: Spent 479.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 21:08:27,576 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 21:08:32,874 WARN L193 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 21:08:40,989 WARN L193 SmtUtils]: Spent 649.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 21:08:48,990 WARN L193 SmtUtils]: Spent 755.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-20 21:08:49,363 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:08:49,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227370736] [2020-07-20 21:08:49,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:08:49,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 21:08:49,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960581354] [2020-07-20 21:08:49,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 21:08:49,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:08:49,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 21:08:49,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=548, Unknown=3, NotChecked=0, Total=650 [2020-07-20 21:08:49,366 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 26 states. [2020-07-20 21:09:45,234 WARN L193 SmtUtils]: Spent 23.42 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 21:10:27,831 WARN L193 SmtUtils]: Spent 8.65 s on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:10:55,569 WARN L193 SmtUtils]: Spent 6.04 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 21:11:38,425 WARN L193 SmtUtils]: Spent 14.90 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 21:12:32,645 WARN L193 SmtUtils]: Spent 21.66 s on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:13:19,350 WARN L193 SmtUtils]: Spent 14.69 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 21:14:49,172 WARN L193 SmtUtils]: Spent 42.37 s on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 21:15:51,929 WARN L193 SmtUtils]: Spent 29.68 s on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:15:58,059 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* 2 c_gcd_test_~a)) (.cse2 (= 0 (mod |c_gcd_test_#in~a| 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 (= .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) (or .cse2 (not (= c_gcd_test_~b c_gcd_test_~a)) .cse1))) is different from false [2020-07-20 21:17:12,117 WARN L193 SmtUtils]: Spent 12.58 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 21:17:17,070 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (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 (= 0 (mod |c_gcd_test_#in~a| (+ (* c_gcd_test_~b (- 1)) c_gcd_test_~a))) (not (= (* 3 c_gcd_test_~b) (* 2 c_gcd_test_~a))) .cse0) (or (= 0 (mod |c_gcd_test_#in~a| c_gcd_test_~a)) (not (= c_gcd_test_~b 0)) .cse0))) is different from false [2020-07-20 21:17:45,449 WARN L193 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-20 21:18:06,744 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 8 [2020-07-20 21:18:35,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:18:35,961 INFO L93 Difference]: Finished difference Result 78 states and 103 transitions. [2020-07-20 21:18:35,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 21:18:35,985 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2020-07-20 21:18:35,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:18:35,987 INFO L225 Difference]: With dead ends: 78 [2020-07-20 21:18:35,988 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 21:18:35,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 485.4s TimeCoverageRelationStatistics Valid=274, Invalid=1246, Unknown=48, NotChecked=154, Total=1722 [2020-07-20 21:18:35,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 21:18:36,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-07-20 21:18:36,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 21:18:36,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 95 transitions. [2020-07-20 21:18:36,008 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 95 transitions. Word has length 29 [2020-07-20 21:18:36,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:18:36,009 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 95 transitions. [2020-07-20 21:18:36,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 21:18:36,009 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 95 transitions. [2020-07-20 21:18:36,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 21:18:36,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:18:36,011 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:18:36,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:18:36,217 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:18:36,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:18:36,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 5 times [2020-07-20 21:18:36,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:18:36,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254173426] [2020-07-20 21:18:36,219 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:18:36,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:18:36,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:18:36,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:18:36,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:18:36,271 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 21:18:36,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:18:36,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254173426] [2020-07-20 21:18:36,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:18:36,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:18:36,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003641376] [2020-07-20 21:18:36,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:18:36,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:18:36,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:18:36,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:18:36,274 INFO L87 Difference]: Start difference. First operand 72 states and 95 transitions. Second operand 3 states. [2020-07-20 21:18:36,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:18:36,309 INFO L93 Difference]: Finished difference Result 86 states and 111 transitions. [2020-07-20 21:18:36,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:18:36,311 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 21:18:36,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:18:36,312 INFO L225 Difference]: With dead ends: 86 [2020-07-20 21:18:36,313 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:18:36,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:18:36,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:18:36,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2020-07-20 21:18:36,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-20 21:18:36,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 87 transitions. [2020-07-20 21:18:36,328 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 87 transitions. Word has length 31 [2020-07-20 21:18:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:18:36,329 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 87 transitions. [2020-07-20 21:18:36,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:18:36,329 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 87 transitions. [2020-07-20 21:18:36,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 21:18:36,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:18:36,331 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] [2020-07-20 21:18:36,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:18:36,546 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:18:36,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:18:36,547 INFO L82 PathProgramCache]: Analyzing trace with hash 808871355, now seen corresponding path program 6 times [2020-07-20 21:18:36,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:18:36,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261300601] [2020-07-20 21:18:36,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:18:36,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:18:36,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:18:36,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:18:36,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:18:37,254 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 21:18:38,217 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:18:38,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:18:39,491 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 21:18:39,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261300601] [2020-07-20 21:18:39,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 21:18:39,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 21:18:39,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019056240] [2020-07-20 21:18:39,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:18:39,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:18:39,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:18:39,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:18:39,495 INFO L87 Difference]: Start difference. First operand 69 states and 87 transitions. Second operand 9 states. [2020-07-20 21:18:49,174 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2020-07-20 21:18:53,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:18:53,804 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2020-07-20 21:18:53,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:18:53,820 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2020-07-20 21:18:53,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:18:53,822 INFO L225 Difference]: With dead ends: 100 [2020-07-20 21:18:53,823 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 21:18:53,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2020-07-20 21:18:53,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 21:18:53,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2020-07-20 21:18:53,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:18:53,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 80 transitions. [2020-07-20 21:18:53,837 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 80 transitions. Word has length 33 [2020-07-20 21:18:53,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:18:53,837 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 80 transitions. [2020-07-20 21:18:53,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:18:53,838 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 80 transitions. [2020-07-20 21:18:53,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 21:18:53,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:18:53,839 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] [2020-07-20 21:18:54,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:18:54,050 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:18:54,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:18:54,051 INFO L82 PathProgramCache]: Analyzing trace with hash -825201876, now seen corresponding path program 1 times [2020-07-20 21:18:54,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:18:54,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076052138] [2020-07-20 21:18:54,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:18:54,139 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:18:54,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:18:54,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 21:18:54,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:18:54,557 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-20 21:18:57,274 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-20 21:18:58,849 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2020-07-20 21:18:59,685 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:18:59,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:19:00,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:00,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:03,006 WARN L193 SmtUtils]: Spent 1.85 s on a formula simplification. DAG size of input: 27 DAG size of output: 5 [2020-07-20 21:19:07,433 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-07-20 21:19:15,898 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 21:19:15,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:19:42,796 WARN L193 SmtUtils]: Spent 7.93 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 21:20:27,251 WARN L193 SmtUtils]: Spent 6.47 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 21:20:51,461 WARN L193 SmtUtils]: Spent 5.82 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 21:21:15,153 WARN L193 SmtUtils]: Spent 6.56 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 21:21:40,425 WARN L193 SmtUtils]: Spent 6.76 s on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:22:16,257 WARN L193 SmtUtils]: Spent 11.46 s on a formula simplification that was a NOOP. DAG size: 32