/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/eca-rers2012/Problem10_label44.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:07:46,865 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:07:46,867 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:07:46,880 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:07:46,880 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:07:46,881 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:07:46,883 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:07:46,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:07:46,886 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:07:46,887 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:07:46,888 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:07:46,889 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:07:46,889 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:07:46,890 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:07:46,891 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:07:46,893 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:07:46,893 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:07:46,894 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:07:46,896 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:07:46,898 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:07:46,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:07:46,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:07:46,902 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:07:46,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:07:46,905 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:07:46,912 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:07:46,913 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:07:46,914 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:07:46,915 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 22:07:46,929 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:07:46,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:07:46,931 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:07:46,931 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:07:46,931 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:07:46,932 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:07:46,932 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:07:46,932 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:07:46,932 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:07:46,932 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:07:46,933 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:07:46,933 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:07:46,933 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:07:46,933 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:07:46,933 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:07:46,934 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:07:46,934 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:07:46,934 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:07:46,934 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:07:46,934 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:07:46,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:07:46,935 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:07:46,935 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:07:46,935 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:07:46,935 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:07:46,936 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:07:46,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:07:46,936 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:07:46,936 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:07:46,936 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 22:07:47,221 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:07:47,243 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:07:47,249 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:07:47,250 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:07:47,250 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:07:47,252 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label44.c [2020-07-20 22:07:47,317 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70c89e152/7aee556ff1bb418b9550ae0f8d12e05c/FLAGb740e30b0 [2020-07-20 22:07:47,899 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:07:47,899 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label44.c [2020-07-20 22:07:47,920 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70c89e152/7aee556ff1bb418b9550ae0f8d12e05c/FLAGb740e30b0 [2020-07-20 22:07:48,167 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70c89e152/7aee556ff1bb418b9550ae0f8d12e05c [2020-07-20 22:07:48,177 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:07:48,180 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:07:48,181 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:07:48,181 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:07:48,185 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:07:48,186 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:48,189 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a48d62b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48, skipping insertion in model container [2020-07-20 22:07:48,189 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:48,197 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:07:48,256 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:07:48,795 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:07:48,799 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:07:48,947 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:07:48,963 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:07:48,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48 WrapperNode [2020-07-20 22:07:48,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:07:48,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:07:48,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:07:48,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:07:48,983 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:48,984 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,004 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,005 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (1/1) ... [2020-07-20 22:07:49,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:07:49,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:07:49,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:07:49,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:07:49,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (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 22:07:49,174 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:07:49,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:07:49,175 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-07-20 22:07:49,175 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:07:49,176 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-07-20 22:07:49,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:07:49,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:07:49,178 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-07-20 22:07:49,178 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:07:49,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:07:49,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:07:50,793 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:07:50,794 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:07:50,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:07:50 BoogieIcfgContainer [2020-07-20 22:07:50,803 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:07:50,807 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:07:50,807 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:07:50,811 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:07:50,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:07:48" (1/3) ... [2020-07-20 22:07:50,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a69ec35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:07:50, skipping insertion in model container [2020-07-20 22:07:50,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:07:48" (2/3) ... [2020-07-20 22:07:50,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a69ec35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:07:50, skipping insertion in model container [2020-07-20 22:07:50,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:07:50" (3/3) ... [2020-07-20 22:07:50,818 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label44.c [2020-07-20 22:07:50,829 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:07:50,844 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:07:50,860 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:07:50,896 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:07:50,897 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:07:50,898 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:07:50,898 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:07:50,898 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:07:50,898 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:07:50,898 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:07:50,899 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:07:50,930 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2020-07-20 22:07:50,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-07-20 22:07:50,944 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:07:50,946 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:07:50,947 INFO L427 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:07:50,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:07:50,953 INFO L82 PathProgramCache]: Analyzing trace with hash 745509942, now seen corresponding path program 1 times [2020-07-20 22:07:50,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:07:50,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384630734] [2020-07-20 22:07:50,962 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 22:07:51,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:07:51,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:07:51,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 22:07:51,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:07:51,179 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 22:07:51,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:07:51,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384630734] [2020-07-20 22:07:51,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:07:51,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:07:51,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916337865] [2020-07-20 22:07:51,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:07:51,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:07:51,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:07:51,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:07:51,206 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 3 states. [2020-07-20 22:07:52,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:07:52,271 INFO L93 Difference]: Finished difference Result 571 states and 989 transitions. [2020-07-20 22:07:52,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:07:52,273 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 63 [2020-07-20 22:07:52,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:07:52,297 INFO L225 Difference]: With dead ends: 571 [2020-07-20 22:07:52,299 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 22:07:52,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 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 22:07:52,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 22:07:52,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 294. [2020-07-20 22:07:52,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-07-20 22:07:52,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 391 transitions. [2020-07-20 22:07:52,427 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 391 transitions. Word has length 63 [2020-07-20 22:07:52,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:07:52,428 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 391 transitions. [2020-07-20 22:07:52,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:07:52,428 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 391 transitions. [2020-07-20 22:07:52,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 22:07:52,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:07:52,443 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:07:52,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:07:52,658 INFO L427 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:07:52,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:07:52,660 INFO L82 PathProgramCache]: Analyzing trace with hash -825362990, now seen corresponding path program 1 times [2020-07-20 22:07:52,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:07:52,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929720793] [2020-07-20 22:07:52,661 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 22:07:52,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:07:52,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:07:52,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:07:52,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:07:52,802 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:07:52,802 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:07:52,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929720793] [2020-07-20 22:07:52,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:07:52,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:07:52,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687240934] [2020-07-20 22:07:52,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:07:52,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:07:52,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:07:52,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:07:52,806 INFO L87 Difference]: Start difference. First operand 294 states and 391 transitions. Second operand 3 states. [2020-07-20 22:07:53,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:07:53,501 INFO L93 Difference]: Finished difference Result 725 states and 1001 transitions. [2020-07-20 22:07:53,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:07:53,502 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 133 [2020-07-20 22:07:53,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:07:53,508 INFO L225 Difference]: With dead ends: 725 [2020-07-20 22:07:53,508 INFO L226 Difference]: Without dead ends: 437 [2020-07-20 22:07:53,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 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 22:07:53,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2020-07-20 22:07:53,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 437. [2020-07-20 22:07:53,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 437 states. [2020-07-20 22:07:53,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 568 transitions. [2020-07-20 22:07:53,535 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 568 transitions. Word has length 133 [2020-07-20 22:07:53,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:07:53,536 INFO L479 AbstractCegarLoop]: Abstraction has 437 states and 568 transitions. [2020-07-20 22:07:53,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:07:53,536 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 568 transitions. [2020-07-20 22:07:53,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2020-07-20 22:07:53,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:07:53,542 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:07:53,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:07:53,746 INFO L427 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:07:53,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:07:53,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1901765607, now seen corresponding path program 1 times [2020-07-20 22:07:53,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:07:53,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472671588] [2020-07-20 22:07:53,749 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 22:07:53,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:07:53,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:07:53,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:07:53,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:07:53,884 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:07:53,886 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:07:58,922 WARN L193 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 22:08:01,002 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-07-20 22:08:01,348 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 3 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:08:01,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:08:01,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:08:01,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-20 22:08:01,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472671588] [2020-07-20 22:08:01,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:08:01,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-07-20 22:08:01,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753873092] [2020-07-20 22:08:01,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:08:01,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:08:01,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:08:01,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=36, Unknown=1, NotChecked=0, Total=56 [2020-07-20 22:08:01,464 INFO L87 Difference]: Start difference. First operand 437 states and 568 transitions. Second operand 6 states. [2020-07-20 22:10:02,387 WARN L193 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 36 DAG size of output: 24 [2020-07-20 22:13:35,120 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 23 [2020-07-20 22:13:55,514 WARN L193 SmtUtils]: Spent 3.82 s on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 22:16:32,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:32,569 INFO L93 Difference]: Finished difference Result 1780 states and 2428 transitions. [2020-07-20 22:16:32,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 22:16:32,578 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 142 [2020-07-20 22:16:32,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:32,590 INFO L225 Difference]: With dead ends: 1780 [2020-07-20 22:16:32,591 INFO L226 Difference]: Without dead ends: 1349 [2020-07-20 22:16:32,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=58, Invalid=97, Unknown=1, NotChecked=0, Total=156 [2020-07-20 22:16:32,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1349 states. [2020-07-20 22:16:32,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1349 to 1319. [2020-07-20 22:16:32,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1319 states. [2020-07-20 22:16:32,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1319 states to 1319 states and 1696 transitions. [2020-07-20 22:16:32,679 INFO L78 Accepts]: Start accepts. Automaton has 1319 states and 1696 transitions. Word has length 142 [2020-07-20 22:16:32,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:32,681 INFO L479 AbstractCegarLoop]: Abstraction has 1319 states and 1696 transitions. [2020-07-20 22:16:32,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:16:32,681 INFO L276 IsEmpty]: Start isEmpty. Operand 1319 states and 1696 transitions. [2020-07-20 22:16:32,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-20 22:16:32,689 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:32,690 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:32,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,905 INFO L427 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:32,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:32,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1171294982, now seen corresponding path program 1 times [2020-07-20 22:16:32,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:32,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859701793] [2020-07-20 22:16:32,906 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 22:16:33,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:16:33,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:33,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:16:33,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:33,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:16:33,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859701793] [2020-07-20 22:16:33,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:16:33,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:16:33,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682098085] [2020-07-20 22:16:33,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:16:33,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:33,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:16:33,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:16:33,158 INFO L87 Difference]: Start difference. First operand 1319 states and 1696 transitions. Second operand 3 states. [2020-07-20 22:16:37,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:37,486 INFO L93 Difference]: Finished difference Result 3355 states and 4414 transitions. [2020-07-20 22:16:37,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:16:37,493 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 185 [2020-07-20 22:16:37,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:37,501 INFO L225 Difference]: With dead ends: 3355 [2020-07-20 22:16:37,502 INFO L226 Difference]: Without dead ends: 1319 [2020-07-20 22:16:37,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 183 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 22:16:37,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1319 states. [2020-07-20 22:16:37,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1319 to 1319. [2020-07-20 22:16:37,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1319 states. [2020-07-20 22:16:37,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1319 states to 1319 states and 1668 transitions. [2020-07-20 22:16:37,544 INFO L78 Accepts]: Start accepts. Automaton has 1319 states and 1668 transitions. Word has length 185 [2020-07-20 22:16:37,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:37,545 INFO L479 AbstractCegarLoop]: Abstraction has 1319 states and 1668 transitions. [2020-07-20 22:16:37,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:16:37,545 INFO L276 IsEmpty]: Start isEmpty. Operand 1319 states and 1668 transitions. [2020-07-20 22:16:37,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-20 22:16:37,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:37,550 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:37,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:37,761 INFO L427 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:37,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:37,762 INFO L82 PathProgramCache]: Analyzing trace with hash 726002093, now seen corresponding path program 1 times [2020-07-20 22:16:37,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:37,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847513774] [2020-07-20 22:16:37,764 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 22:16:37,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:16:37,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:37,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:16:37,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:37,969 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:37,970 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:16:37,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847513774] [2020-07-20 22:16:37,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:16:37,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:16:37,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861243912] [2020-07-20 22:16:37,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:16:37,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:37,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:16:37,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:16:37,972 INFO L87 Difference]: Start difference. First operand 1319 states and 1668 transitions. Second operand 3 states. [2020-07-20 22:16:42,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:42,199 INFO L93 Difference]: Finished difference Result 2189 states and 2822 transitions. [2020-07-20 22:16:42,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:16:42,207 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 200 [2020-07-20 22:16:42,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:42,221 INFO L225 Difference]: With dead ends: 2189 [2020-07-20 22:16:42,221 INFO L226 Difference]: Without dead ends: 2187 [2020-07-20 22:16:42,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 198 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 22:16:42,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2187 states. [2020-07-20 22:16:42,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2187 to 1756. [2020-07-20 22:16:42,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1756 states. [2020-07-20 22:16:42,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1756 states to 1756 states and 2286 transitions. [2020-07-20 22:16:42,278 INFO L78 Accepts]: Start accepts. Automaton has 1756 states and 2286 transitions. Word has length 200 [2020-07-20 22:16:42,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:42,279 INFO L479 AbstractCegarLoop]: Abstraction has 1756 states and 2286 transitions. [2020-07-20 22:16:42,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:16:42,280 INFO L276 IsEmpty]: Start isEmpty. Operand 1756 states and 2286 transitions. [2020-07-20 22:16:42,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2020-07-20 22:16:42,285 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:42,285 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 22:16:42,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:42,501 INFO L427 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:42,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:42,502 INFO L82 PathProgramCache]: Analyzing trace with hash -31565570, now seen corresponding path program 1 times [2020-07-20 22:16:42,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:42,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170309706] [2020-07-20 22:16:42,503 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 22:16:42,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:16:42,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:42,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:16:42,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:42,755 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 189 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:42,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:16:43,088 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 189 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:43,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170309706] [2020-07-20 22:16:43,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:16:43,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-20 22:16:43,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296976740] [2020-07-20 22:16:43,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:16:43,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:43,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:16:43,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:16:43,104 INFO L87 Difference]: Start difference. First operand 1756 states and 2286 transitions. Second operand 6 states. [2020-07-20 22:16:50,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:50,276 INFO L93 Difference]: Finished difference Result 4228 states and 6058 transitions. [2020-07-20 22:16:50,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:16:50,286 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 233 [2020-07-20 22:16:50,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:50,306 INFO L225 Difference]: With dead ends: 4228 [2020-07-20 22:16:50,307 INFO L226 Difference]: Without dead ends: 2478 [2020-07-20 22:16:50,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 462 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-20 22:16:50,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2478 states. [2020-07-20 22:16:50,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2478 to 2074. [2020-07-20 22:16:50,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2074 states. [2020-07-20 22:16:50,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2074 states to 2074 states and 2622 transitions. [2020-07-20 22:16:50,436 INFO L78 Accepts]: Start accepts. Automaton has 2074 states and 2622 transitions. Word has length 233 [2020-07-20 22:16:50,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:50,437 INFO L479 AbstractCegarLoop]: Abstraction has 2074 states and 2622 transitions. [2020-07-20 22:16:50,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:16:50,437 INFO L276 IsEmpty]: Start isEmpty. Operand 2074 states and 2622 transitions. [2020-07-20 22:16:50,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2020-07-20 22:16:50,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:50,446 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:50,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:50,661 INFO L427 AbstractCegarLoop]: === Iteration 7 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:50,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:50,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1481429953, now seen corresponding path program 1 times [2020-07-20 22:16:50,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:50,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127257061] [2020-07-20 22:16:50,662 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 22:16:50,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:16:50,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:50,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 22:16:50,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:50,888 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:16:50,889 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:17:07,242 WARN L193 SmtUtils]: Spent 16.30 s on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 22:17:07,326 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-07-20 22:17:09,556 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 25 [2020-07-20 22:17:09,666 INFO L320 QuantifierPusher]: Applying distributivity to a CONJUNCTION[2, 3, 3, 1] term [2020-07-20 22:17:09,666 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-07-20 22:17:09,668 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-07-20 22:17:09,875 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 10 [2020-07-20 22:17:09,886 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:17:09,887 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:17:10,013 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 328 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 22:17:10,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:17:10,390 WARN L193 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2020-07-20 22:17:10,769 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2020-07-20 22:17:10,898 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 22:17:10,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-20 22:17:10,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:10,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:10,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-20 22:17:11,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:11,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-20 22:17:11,649 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 22:17:11,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:11,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:11,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:17:11,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-20 22:17:13,261 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification. DAG size of input: 27 DAG size of output: 13 [2020-07-20 22:17:13,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127257061] [2020-07-20 22:17:13,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:17:13,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-20 22:17:13,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071601900] [2020-07-20 22:17:13,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:17:13,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:17:13,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:17:13,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=81, Unknown=1, NotChecked=0, Total=110 [2020-07-20 22:17:13,267 INFO L87 Difference]: Start difference. First operand 2074 states and 2622 transitions. Second operand 8 states. [2020-07-20 22:17:46,366 WARN L193 SmtUtils]: Spent 30.58 s on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2020-07-20 22:21:09,983 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 22:21:45,758 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 22:22:04,865 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 17