/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:16:09,755 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:16:09,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:16:09,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:16:09,777 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:16:09,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:16:09,781 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:16:09,784 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:16:09,786 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:16:09,788 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:16:09,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:16:09,791 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:16:09,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:16:09,793 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:16:09,795 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:16:09,797 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:16:09,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:16:09,801 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:16:09,804 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:16:09,806 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:16:09,810 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:16:09,812 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:16:09,814 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:16:09,815 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:16:09,818 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:16:09,818 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:16:09,819 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:16:09,820 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:16:09,821 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:16:09,822 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:16:09,823 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:16:09,825 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:16:09,826 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:16:09,827 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:16:09,829 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:16:09,830 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:16:09,834 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:16:09,834 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:16:09,835 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:16:09,836 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:16:09,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:16:09,842 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:16:09,896 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:16:09,896 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:16:09,901 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:16:09,902 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:16:09,902 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:16:09,902 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:16:09,903 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:16:09,903 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:16:09,903 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:16:09,903 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:16:09,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:16:09,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:16:09,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:16:09,907 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:16:09,907 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:16:09,907 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:16:09,907 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:16:09,908 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:16:09,908 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:16:09,908 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:16:09,909 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:16:09,910 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:09,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:16:09,910 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:16:09,910 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:16:09,911 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:16:09,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:09,911 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:16:09,911 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:16:09,911 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:16:10,324 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:16:10,344 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:16:10,350 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:16:10,352 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:16:10,354 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:16:10,354 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 16:16:10,461 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a10ddba3/a8984e01902443c68526d0ed0293b6f5/FLAG22989ddf2 [2020-07-21 16:16:11,187 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:16:11,188 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 16:16:11,215 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a10ddba3/a8984e01902443c68526d0ed0293b6f5/FLAG22989ddf2 [2020-07-21 16:16:11,474 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3a10ddba3/a8984e01902443c68526d0ed0293b6f5 [2020-07-21 16:16:11,489 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:16:11,494 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:16:11,495 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:11,496 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:16:11,501 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:16:11,503 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:11,508 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d41fe60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11, skipping insertion in model container [2020-07-21 16:16:11,509 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:11,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:16:11,565 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:16:11,897 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:11,905 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:16:11,937 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:11,956 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:16:11,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11 WrapperNode [2020-07-21 16:16:11,958 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:11,959 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:16:11,960 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:16:11,960 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:16:11,977 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:11,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,012 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,013 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,036 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... [2020-07-21 16:16:12,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:16:12,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:16:12,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:16:12,042 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:16:12,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:12,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:16:12,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:16:12,237 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:16:12,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:16:12,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:16:12,238 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:16:12,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:16:12,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:16:12,810 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:16:12,810 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:16:12,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:12 BoogieIcfgContainer [2020-07-21 16:16:12,818 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:16:12,819 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:16:12,820 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:16:12,825 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:16:12,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:16:11" (1/3) ... [2020-07-21 16:16:12,828 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76b2b14e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:12, skipping insertion in model container [2020-07-21 16:16:12,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:11" (2/3) ... [2020-07-21 16:16:12,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76b2b14e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:12, skipping insertion in model container [2020-07-21 16:16:12,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:12" (3/3) ... [2020-07-21 16:16:12,832 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-21 16:16:12,850 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:16:12,864 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:16:12,887 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:16:12,927 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:16:12,928 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:16:12,928 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:16:12,928 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:16:12,928 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:16:12,929 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:16:12,929 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:16:12,929 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:16:12,955 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-21 16:16:12,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:12,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:12,968 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:12,968 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:12,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:12,976 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-21 16:16:12,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:12,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898967106] [2020-07-21 16:16:12,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:13,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:13,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:13,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:13,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:13,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:13,237 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:13,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898967106] [2020-07-21 16:16:13,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:13,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:13,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804002376] [2020-07-21 16:16:13,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:13,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:13,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:13,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,271 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-21 16:16:13,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:13,362 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-21 16:16:13,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:13,366 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:13,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:13,388 INFO L225 Difference]: With dead ends: 93 [2020-07-21 16:16:13,388 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 16:16:13,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 16:16:13,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-21 16:16:13,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 16:16:13,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-21 16:16:13,487 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-21 16:16:13,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:13,491 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-21 16:16:13,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:13,493 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-21 16:16:13,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:13,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:13,496 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:13,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:13,712 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:13,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:13,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-21 16:16:13,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:13,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643020485] [2020-07-21 16:16:13,716 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:13,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:13,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:13,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:13,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:13,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:13,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:13,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643020485] [2020-07-21 16:16:13,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:13,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:13,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619632338] [2020-07-21 16:16:13,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:13,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:13,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:13,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,851 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-21 16:16:13,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:13,887 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-21 16:16:13,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:13,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:13,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:13,891 INFO L225 Difference]: With dead ends: 127 [2020-07-21 16:16:13,891 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 16:16:13,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 16:16:13,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 16:16:13,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 16:16:13,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-21 16:16:13,910 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-21 16:16:13,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:13,911 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-21 16:16:13,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:13,911 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-21 16:16:13,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:13,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:13,913 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] [2020-07-21 16:16:14,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,131 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:14,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:14,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-21 16:16:14,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:14,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414917521] [2020-07-21 16:16:14,134 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:14,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:14,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:14,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:14,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:14,257 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:14,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414917521] [2020-07-21 16:16:14,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:14,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:14,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607516950] [2020-07-21 16:16:14,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:14,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:14,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:14,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:14,262 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-21 16:16:14,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:14,298 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 16:16:14,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:14,299 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:14,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:14,301 INFO L225 Difference]: With dead ends: 117 [2020-07-21 16:16:14,302 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 16:16:14,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:14,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 16:16:14,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-21 16:16:14,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 16:16:14,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-21 16:16:14,319 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-21 16:16:14,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:14,319 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-21 16:16:14,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:14,320 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-21 16:16:14,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:14,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:14,322 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] [2020-07-21 16:16:14,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,537 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:14,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:14,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-21 16:16:14,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:14,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522940022] [2020-07-21 16:16:14,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:14,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:14,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:14,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:14,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:14,679 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:14,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522940022] [2020-07-21 16:16:14,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:14,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:14,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782316001] [2020-07-21 16:16:14,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:14,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:14,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:14,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:14,683 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-21 16:16:14,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:14,715 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-21 16:16:14,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:14,716 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:14,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:14,719 INFO L225 Difference]: With dead ends: 148 [2020-07-21 16:16:14,719 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 16:16:14,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:14,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 16:16:14,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-21 16:16:14,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 16:16:14,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-21 16:16:14,740 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-21 16:16:14,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:14,742 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-21 16:16:14,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:14,743 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-21 16:16:14,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:14,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:14,745 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] [2020-07-21 16:16:14,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,960 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:14,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:14,961 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-21 16:16:14,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:14,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19299926] [2020-07-21 16:16:14,962 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:15,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:15,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:15,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:15,057 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:15,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19299926] [2020-07-21 16:16:15,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:15,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:15,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873659708] [2020-07-21 16:16:15,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:15,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:15,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:15,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,061 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-21 16:16:15,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:15,094 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-21 16:16:15,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:15,096 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:15,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:15,098 INFO L225 Difference]: With dead ends: 244 [2020-07-21 16:16:15,098 INFO L226 Difference]: Without dead ends: 148 [2020-07-21 16:16:15,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-21 16:16:15,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-21 16:16:15,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 16:16:15,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-21 16:16:15,120 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-21 16:16:15,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:15,120 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-21 16:16:15,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:15,121 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-21 16:16:15,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:15,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:15,123 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] [2020-07-21 16:16:15,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,337 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:15,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:15,339 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-21 16:16:15,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:15,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414277363] [2020-07-21 16:16:15,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,434 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:15,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:15,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:15,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:15,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:15,479 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:15,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414277363] [2020-07-21 16:16:15,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:15,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:15,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135838903] [2020-07-21 16:16:15,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:15,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:15,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:15,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,488 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-21 16:16:15,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:15,524 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-21 16:16:15,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:15,525 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:15,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:15,532 INFO L225 Difference]: With dead ends: 219 [2020-07-21 16:16:15,533 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 16:16:15,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 16:16:15,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-21 16:16:15,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 16:16:15,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-21 16:16:15,580 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-21 16:16:15,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:15,581 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-21 16:16:15,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-21 16:16:15,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:15,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:15,584 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] [2020-07-21 16:16:15,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,802 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:15,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:15,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-21 16:16:15,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:15,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667541710] [2020-07-21 16:16:15,804 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:15,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:15,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:15,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:15,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:15,890 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:15,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667541710] [2020-07-21 16:16:15,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:15,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:15,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225958372] [2020-07-21 16:16:15,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:15,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:15,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:15,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,897 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-21 16:16:15,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:15,936 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-21 16:16:15,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:15,938 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:15,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:15,940 INFO L225 Difference]: With dead ends: 276 [2020-07-21 16:16:15,941 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 16:16:15,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 16:16:15,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-21 16:16:15,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 16:16:15,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-21 16:16:15,972 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-21 16:16:15,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:15,974 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-21 16:16:15,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:15,974 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-21 16:16:15,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:15,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:15,979 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] [2020-07-21 16:16:16,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:16,185 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:16,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:16,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-21 16:16:16,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:16,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330046074] [2020-07-21 16:16:16,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:16,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:16,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:16,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:16,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:16,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:16,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:16,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330046074] [2020-07-21 16:16:16,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:16,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:16,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124237397] [2020-07-21 16:16:16,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:16,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:16,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:16,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:16,306 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-21 16:16:16,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:16,366 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-21 16:16:16,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:16,368 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:16,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:16,372 INFO L225 Difference]: With dead ends: 472 [2020-07-21 16:16:16,372 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 16:16:16,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:16,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 16:16:16,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-21 16:16:16,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 16:16:16,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-21 16:16:16,441 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-21 16:16:16,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:16,442 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-21 16:16:16,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:16,445 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-21 16:16:16,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:16,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:16,452 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] [2020-07-21 16:16:16,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:16,667 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:16,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:16,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-21 16:16:16,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:16,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89585049] [2020-07-21 16:16:16,669 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:16,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:16,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:16,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:16,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:16,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:16,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89585049] [2020-07-21 16:16:16,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:16,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:16,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914869479] [2020-07-21 16:16:16,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:16,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:16,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:16,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:16,764 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-21 16:16:16,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:16,790 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-21 16:16:16,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:16,792 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:16,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:16,794 INFO L225 Difference]: With dead ends: 420 [2020-07-21 16:16:16,795 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 16:16:16,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:16,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 16:16:16,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-21 16:16:16,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 16:16:16,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-21 16:16:16,815 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-21 16:16:16,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:16,815 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-21 16:16:16,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:16,815 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-21 16:16:16,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:16,817 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:16,817 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] [2020-07-21 16:16:17,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,034 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:17,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:17,035 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-21 16:16:17,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:17,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625698153] [2020-07-21 16:16:17,037 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:17,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:17,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:17,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:17,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:17,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:17,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625698153] [2020-07-21 16:16:17,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:17,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:17,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551521508] [2020-07-21 16:16:17,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:17,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:17,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:17,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,108 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-21 16:16:17,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:17,148 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-21 16:16:17,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:17,149 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:17,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:17,154 INFO L225 Difference]: With dead ends: 524 [2020-07-21 16:16:17,154 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 16:16:17,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 16:16:17,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-21 16:16:17,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 16:16:17,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-21 16:16:17,177 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-21 16:16:17,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:17,178 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-21 16:16:17,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:17,178 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-21 16:16:17,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:17,180 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:17,181 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] [2020-07-21 16:16:17,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,395 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:17,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:17,396 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-21 16:16:17,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:17,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029045285] [2020-07-21 16:16:17,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:17,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:17,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:17,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:17,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:17,473 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:17,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029045285] [2020-07-21 16:16:17,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:17,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:17,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305941922] [2020-07-21 16:16:17,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:17,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:17,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:17,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,477 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-21 16:16:17,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:17,530 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-21 16:16:17,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:17,531 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:17,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:17,538 INFO L225 Difference]: With dead ends: 924 [2020-07-21 16:16:17,538 INFO L226 Difference]: Without dead ends: 546 [2020-07-21 16:16:17,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-21 16:16:17,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-21 16:16:17,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-21 16:16:17,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-21 16:16:17,586 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-21 16:16:17,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:17,587 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-21 16:16:17,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:17,587 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-21 16:16:17,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:17,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:17,593 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] [2020-07-21 16:16:17,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,807 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:17,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:17,808 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-21 16:16:17,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:17,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354277461] [2020-07-21 16:16:17,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:17,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:17,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:17,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:17,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:17,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354277461] [2020-07-21 16:16:17,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:17,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:17,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140106096] [2020-07-21 16:16:17,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:17,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:17,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:17,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,868 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-21 16:16:17,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:17,907 INFO L93 Difference]: Finished difference Result 816 states and 1348 transitions. [2020-07-21 16:16:17,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:17,908 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:17,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:17,913 INFO L225 Difference]: With dead ends: 816 [2020-07-21 16:16:17,913 INFO L226 Difference]: Without dead ends: 554 [2020-07-21 16:16:17,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2020-07-21 16:16:17,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 552. [2020-07-21 16:16:17,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 552 states. [2020-07-21 16:16:17,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 902 transitions. [2020-07-21 16:16:17,940 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 902 transitions. Word has length 25 [2020-07-21 16:16:17,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:17,940 INFO L479 AbstractCegarLoop]: Abstraction has 552 states and 902 transitions. [2020-07-21 16:16:17,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:17,941 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 902 transitions. [2020-07-21 16:16:17,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:17,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:17,943 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] [2020-07-21 16:16:18,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:18,159 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:18,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:18,160 INFO L82 PathProgramCache]: Analyzing trace with hash 2046215812, now seen corresponding path program 1 times [2020-07-21 16:16:18,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:18,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351819969] [2020-07-21 16:16:18,162 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:18,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:18,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:18,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:18,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:18,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:18,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:18,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351819969] [2020-07-21 16:16:18,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:18,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:18,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39696832] [2020-07-21 16:16:18,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:18,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:18,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:18,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:18,243 INFO L87 Difference]: Start difference. First operand 552 states and 902 transitions. Second operand 3 states. [2020-07-21 16:16:18,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:18,281 INFO L93 Difference]: Finished difference Result 1004 states and 1672 transitions. [2020-07-21 16:16:18,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:18,283 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:18,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:18,292 INFO L225 Difference]: With dead ends: 1004 [2020-07-21 16:16:18,292 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 16:16:18,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:18,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 16:16:18,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 776. [2020-07-21 16:16:18,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 16:16:18,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-21 16:16:18,344 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-21 16:16:18,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:18,344 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-21 16:16:18,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:18,345 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-21 16:16:18,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:18,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:18,348 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] [2020-07-21 16:16:18,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:18,565 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:18,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:18,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-21 16:16:18,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:18,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868036221] [2020-07-21 16:16:18,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:18,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:18,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:18,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:18,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:18,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:18,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868036221] [2020-07-21 16:16:18,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:18,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:18,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797972043] [2020-07-21 16:16:18,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:18,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:18,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:18,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:18,662 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-21 16:16:18,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:18,725 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-21 16:16:18,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:18,727 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:18,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:18,737 INFO L225 Difference]: With dead ends: 1820 [2020-07-21 16:16:18,738 INFO L226 Difference]: Without dead ends: 1066 [2020-07-21 16:16:18,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:18,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-21 16:16:18,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-21 16:16:18,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-21 16:16:18,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-21 16:16:18,838 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-21 16:16:18,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:18,839 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-21 16:16:18,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:18,840 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-21 16:16:18,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:18,843 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:18,843 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] [2020-07-21 16:16:19,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,058 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:19,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:19,059 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-21 16:16:19,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:19,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736781939] [2020-07-21 16:16:19,061 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:19,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:19,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:19,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:19,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:19,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:19,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736781939] [2020-07-21 16:16:19,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:19,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:19,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753851526] [2020-07-21 16:16:19,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:19,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:19,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:19,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:19,139 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-21 16:16:19,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:19,183 INFO L93 Difference]: Finished difference Result 1596 states and 2520 transitions. [2020-07-21 16:16:19,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:19,184 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:19,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:19,191 INFO L225 Difference]: With dead ends: 1596 [2020-07-21 16:16:19,191 INFO L226 Difference]: Without dead ends: 1082 [2020-07-21 16:16:19,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:19,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2020-07-21 16:16:19,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 1080. [2020-07-21 16:16:19,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1080 states. [2020-07-21 16:16:19,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1080 states to 1080 states and 1686 transitions. [2020-07-21 16:16:19,237 INFO L78 Accepts]: Start accepts. Automaton has 1080 states and 1686 transitions. Word has length 26 [2020-07-21 16:16:19,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:19,237 INFO L479 AbstractCegarLoop]: Abstraction has 1080 states and 1686 transitions. [2020-07-21 16:16:19,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:19,238 INFO L276 IsEmpty]: Start isEmpty. Operand 1080 states and 1686 transitions. [2020-07-21 16:16:19,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:19,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:19,241 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] [2020-07-21 16:16:19,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,456 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:19,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:19,456 INFO L82 PathProgramCache]: Analyzing trace with hash 2023498770, now seen corresponding path program 1 times [2020-07-21 16:16:19,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:19,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225082468] [2020-07-21 16:16:19,457 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:19,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:19,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:19,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:19,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:19,519 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:19,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225082468] [2020-07-21 16:16:19,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:19,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:19,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727091145] [2020-07-21 16:16:19,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:19,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:19,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:19,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:19,521 INFO L87 Difference]: Start difference. First operand 1080 states and 1686 transitions. Second operand 3 states. [2020-07-21 16:16:19,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:19,573 INFO L93 Difference]: Finished difference Result 1932 states and 3080 transitions. [2020-07-21 16:16:19,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:19,574 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:19,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:19,588 INFO L225 Difference]: With dead ends: 1932 [2020-07-21 16:16:19,588 INFO L226 Difference]: Without dead ends: 1930 [2020-07-21 16:16:19,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:19,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-21 16:16:19,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1544. [2020-07-21 16:16:19,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 16:16:19,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-21 16:16:19,665 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-21 16:16:19,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:19,666 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-21 16:16:19,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:19,666 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-21 16:16:19,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:19,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:19,673 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] [2020-07-21 16:16:19,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,889 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:19,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:19,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-21 16:16:19,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:19,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928024364] [2020-07-21 16:16:19,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:19,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:19,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:19,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:19,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:19,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:19,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:19,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928024364] [2020-07-21 16:16:19,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:19,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:19,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174745687] [2020-07-21 16:16:19,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:19,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:19,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:19,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:19,961 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-21 16:16:20,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:20,039 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-21 16:16:20,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:20,040 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:20,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:20,055 INFO L225 Difference]: With dead ends: 3596 [2020-07-21 16:16:20,056 INFO L226 Difference]: Without dead ends: 2090 [2020-07-21 16:16:20,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:20,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-21 16:16:20,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-21 16:16:20,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-21 16:16:20,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-21 16:16:20,147 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-21 16:16:20,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:20,148 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-21 16:16:20,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:20,148 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-21 16:16:20,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:20,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:20,153 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] [2020-07-21 16:16:20,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:20,369 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:20,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:20,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-21 16:16:20,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:20,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598933690] [2020-07-21 16:16:20,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:20,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:20,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:20,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:20,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:20,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:20,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:20,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598933690] [2020-07-21 16:16:20,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:20,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:20,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543691826] [2020-07-21 16:16:20,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:20,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:20,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:20,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:20,475 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-21 16:16:20,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:20,537 INFO L93 Difference]: Finished difference Result 3132 states and 4696 transitions. [2020-07-21 16:16:20,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:20,538 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:20,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:20,554 INFO L225 Difference]: With dead ends: 3132 [2020-07-21 16:16:20,555 INFO L226 Difference]: Without dead ends: 2122 [2020-07-21 16:16:20,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:20,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2020-07-21 16:16:20,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 2120. [2020-07-21 16:16:20,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2120 states. [2020-07-21 16:16:20,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2120 states to 2120 states and 3142 transitions. [2020-07-21 16:16:20,656 INFO L78 Accepts]: Start accepts. Automaton has 2120 states and 3142 transitions. Word has length 27 [2020-07-21 16:16:20,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:20,657 INFO L479 AbstractCegarLoop]: Abstraction has 2120 states and 3142 transitions. [2020-07-21 16:16:20,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:20,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2120 states and 3142 transitions. [2020-07-21 16:16:20,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:20,662 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:20,662 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] [2020-07-21 16:16:20,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:20,878 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:20,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:20,879 INFO L82 PathProgramCache]: Analyzing trace with hash 1319270809, now seen corresponding path program 1 times [2020-07-21 16:16:20,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:20,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953099129] [2020-07-21 16:16:20,879 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:20,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:20,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:20,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:20,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:20,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:20,983 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:20,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953099129] [2020-07-21 16:16:20,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:20,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:20,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034845948] [2020-07-21 16:16:20,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:20,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:20,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:20,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:20,990 INFO L87 Difference]: Start difference. First operand 2120 states and 3142 transitions. Second operand 3 states. [2020-07-21 16:16:21,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:21,089 INFO L93 Difference]: Finished difference Result 3724 states and 5640 transitions. [2020-07-21 16:16:21,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:21,090 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:21,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:21,121 INFO L225 Difference]: With dead ends: 3724 [2020-07-21 16:16:21,122 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 16:16:21,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:21,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 16:16:21,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3080. [2020-07-21 16:16:21,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-21 16:16:21,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-21 16:16:21,283 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-21 16:16:21,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:21,283 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-21 16:16:21,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:21,283 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-21 16:16:21,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:21,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:21,293 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] [2020-07-21 16:16:21,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:21,508 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:21,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:21,509 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-21 16:16:21,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:21,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802727157] [2020-07-21 16:16:21,510 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:21,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:21,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:21,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:21,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:21,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:21,604 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:21,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802727157] [2020-07-21 16:16:21,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:21,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:21,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769181683] [2020-07-21 16:16:21,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:21,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:21,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:21,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:21,609 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-21 16:16:21,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:21,730 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-21 16:16:21,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:21,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:21,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:21,765 INFO L225 Difference]: With dead ends: 7116 [2020-07-21 16:16:21,766 INFO L226 Difference]: Without dead ends: 4106 [2020-07-21 16:16:21,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:21,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-21 16:16:21,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-21 16:16:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-21 16:16:21,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-21 16:16:21,962 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-21 16:16:21,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:21,962 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-21 16:16:21,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:21,963 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-21 16:16:21,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:16:21,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:21,971 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] [2020-07-21 16:16:22,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:22,185 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:22,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:22,186 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-21 16:16:22,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:22,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209579588] [2020-07-21 16:16:22,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:22,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:22,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:22,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:22,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:22,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:22,255 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:22,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209579588] [2020-07-21 16:16:22,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:22,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:22,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193209790] [2020-07-21 16:16:22,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:22,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:22,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:22,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:22,258 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-21 16:16:22,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:22,340 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-21 16:16:22,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:22,340 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:16:22,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:22,367 INFO L225 Difference]: With dead ends: 6156 [2020-07-21 16:16:22,368 INFO L226 Difference]: Without dead ends: 4170 [2020-07-21 16:16:22,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:22,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-21 16:16:22,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-21 16:16:22,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-21 16:16:22,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-21 16:16:22,547 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-21 16:16:22,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:22,548 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-21 16:16:22,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:22,548 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-21 16:16:22,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:16:22,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:22,558 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] [2020-07-21 16:16:22,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:22,775 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:22,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:22,776 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-21 16:16:22,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:22,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176090017] [2020-07-21 16:16:22,778 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:22,835 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:22,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:22,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:22,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:22,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:22,850 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:22,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176090017] [2020-07-21 16:16:22,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:22,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:22,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890218931] [2020-07-21 16:16:22,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:22,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:22,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:22,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:22,853 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-21 16:16:23,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:23,092 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-21 16:16:23,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:23,095 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:16:23,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:23,120 INFO L225 Difference]: With dead ends: 12108 [2020-07-21 16:16:23,120 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 16:16:23,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 16:16:23,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-21 16:16:23,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 16:16:23,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-21 16:16:23,397 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-21 16:16:23,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:23,397 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-21 16:16:23,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:23,398 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-21 16:16:23,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:16:23,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:23,412 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] [2020-07-21 16:16:23,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,628 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:23,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:23,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-21 16:16:23,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:23,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737870790] [2020-07-21 16:16:23,630 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:23,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:23,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:23,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:23,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:23,693 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:23,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737870790] [2020-07-21 16:16:23,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:23,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:23,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124095251] [2020-07-21 16:16:23,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:23,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:23,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:23,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,696 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-21 16:16:23,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:23,871 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-21 16:16:23,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:23,872 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:16:23,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:23,903 INFO L225 Difference]: With dead ends: 9100 [2020-07-21 16:16:23,904 INFO L226 Difference]: Without dead ends: 9098 [2020-07-21 16:16:23,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-21 16:16:24,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-21 16:16:24,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 16:16:24,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-21 16:16:24,174 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-21 16:16:24,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:24,174 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-21 16:16:24,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:24,174 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-21 16:16:24,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:16:24,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:24,190 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] [2020-07-21 16:16:24,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:24,403 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:24,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:24,404 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-21 16:16:24,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:24,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234335362] [2020-07-21 16:16:24,404 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:24,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:24,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:24,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:24,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:24,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:24,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:24,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234335362] [2020-07-21 16:16:24,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:24,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:24,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749569580] [2020-07-21 16:16:24,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:24,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:24,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:24,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,468 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-21 16:16:24,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:24,729 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-21 16:16:24,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:24,729 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 16:16:24,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:24,772 INFO L225 Difference]: With dead ends: 13708 [2020-07-21 16:16:24,773 INFO L226 Difference]: Without dead ends: 13706 [2020-07-21 16:16:24,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-21 16:16:25,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-21 16:16:25,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-21 16:16:25,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-21 16:16:25,121 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-21 16:16:25,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,122 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-21 16:16:25,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,122 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-21 16:16:25,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:16:25,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,154 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] [2020-07-21 16:16:25,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,369 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-21 16:16:25,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89728674] [2020-07-21 16:16:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:25,426 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89728674] [2020-07-21 16:16:25,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35338595] [2020-07-21 16:16:25,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,430 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-21 16:16:25,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,688 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-21 16:16:25,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,689 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 16:16:25,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,751 INFO L225 Difference]: With dead ends: 27788 [2020-07-21 16:16:25,752 INFO L226 Difference]: Without dead ends: 15754 [2020-07-21 16:16:25,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-21 16:16:26,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-21 16:16:26,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-21 16:16:26,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-21 16:16:26,422 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-21 16:16:26,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,422 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-21 16:16:26,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,422 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-21 16:16:26,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 16:16:26,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,455 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] [2020-07-21 16:16:26,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,668 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,669 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-21 16:16:26,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352346816] [2020-07-21 16:16:26,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:26,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352346816] [2020-07-21 16:16:26,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186538144] [2020-07-21 16:16:26,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,752 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-21 16:16:26,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,977 INFO L93 Difference]: Finished difference Result 23820 states and 30216 transitions. [2020-07-21 16:16:26,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,978 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 16:16:26,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:27,040 INFO L225 Difference]: With dead ends: 23820 [2020-07-21 16:16:27,040 INFO L226 Difference]: Without dead ends: 16138 [2020-07-21 16:16:27,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16138 states. [2020-07-21 16:16:28,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16138 to 16136. [2020-07-21 16:16:28,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16136 states. [2020-07-21 16:16:28,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16136 states to 16136 states and 20230 transitions. [2020-07-21 16:16:28,279 INFO L78 Accepts]: Start accepts. Automaton has 16136 states and 20230 transitions. Word has length 30 [2020-07-21 16:16:28,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:28,279 INFO L479 AbstractCegarLoop]: Abstraction has 16136 states and 20230 transitions. [2020-07-21 16:16:28,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:28,280 INFO L276 IsEmpty]: Start isEmpty. Operand 16136 states and 20230 transitions. [2020-07-21 16:16:28,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 16:16:28,311 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:28,312 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] [2020-07-21 16:16:28,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,526 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:28,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:28,527 INFO L82 PathProgramCache]: Analyzing trace with hash 791308478, now seen corresponding path program 1 times [2020-07-21 16:16:28,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:28,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856873783] [2020-07-21 16:16:28,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:28,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:28,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:28,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:28,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:28,599 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:28,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856873783] [2020-07-21 16:16:28,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:28,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:28,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271059383] [2020-07-21 16:16:28,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:28,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:28,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:28,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,603 INFO L87 Difference]: Start difference. First operand 16136 states and 20230 transitions. Second operand 3 states. [2020-07-21 16:16:28,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:28,983 INFO L93 Difference]: Finished difference Result 26636 states and 33544 transitions. [2020-07-21 16:16:28,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:28,984 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 16:16:28,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:29,089 INFO L225 Difference]: With dead ends: 26636 [2020-07-21 16:16:29,089 INFO L226 Difference]: Without dead ends: 26634 [2020-07-21 16:16:29,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26634 states. [2020-07-21 16:16:29,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26634 to 24584. [2020-07-21 16:16:29,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-21 16:16:29,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-21 16:16:29,879 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-21 16:16:29,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:29,880 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-21 16:16:29,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:29,880 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-21 16:16:29,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 16:16:29,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:29,936 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] [2020-07-21 16:16:30,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,152 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:30,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:30,153 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-21 16:16:30,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:30,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321352611] [2020-07-21 16:16:30,155 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:30,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:30,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:30,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:30,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:30,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:30,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321352611] [2020-07-21 16:16:30,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:30,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:30,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236707114] [2020-07-21 16:16:30,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:30,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:30,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:30,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,363 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-21 16:16:30,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:30,892 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-21 16:16:30,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:30,893 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 16:16:30,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:31,000 INFO L225 Difference]: With dead ends: 55308 [2020-07-21 16:16:31,000 INFO L226 Difference]: Without dead ends: 31242 [2020-07-21 16:16:31,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:31,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-21 16:16:32,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-21 16:16:32,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-21 16:16:32,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-21 16:16:32,931 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-21 16:16:32,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:32,932 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-21 16:16:32,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:32,932 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-21 16:16:32,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:16:32,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:32,963 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] [2020-07-21 16:16:33,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:33,164 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:33,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:33,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-21 16:16:33,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:33,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052231841] [2020-07-21 16:16:33,166 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:33,205 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:33,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:33,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:33,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:33,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:33,224 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:33,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052231841] [2020-07-21 16:16:33,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:33,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:33,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818956002] [2020-07-21 16:16:33,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:33,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:33,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:33,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:33,227 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-21 16:16:33,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:33,648 INFO L93 Difference]: Finished difference Result 46860 states and 55048 transitions. [2020-07-21 16:16:33,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:33,648 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 16:16:33,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:33,731 INFO L225 Difference]: With dead ends: 46860 [2020-07-21 16:16:33,731 INFO L226 Difference]: Without dead ends: 31754 [2020-07-21 16:16:33,778 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 [2020-07-21 16:16:33,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31754 states. [2020-07-21 16:16:34,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31754 to 31752. [2020-07-21 16:16:34,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31752 states. [2020-07-21 16:16:35,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31752 states to 31752 states and 36870 transitions. [2020-07-21 16:16:35,052 INFO L78 Accepts]: Start accepts. Automaton has 31752 states and 36870 transitions. Word has length 31 [2020-07-21 16:16:35,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:35,052 INFO L479 AbstractCegarLoop]: Abstraction has 31752 states and 36870 transitions. [2020-07-21 16:16:35,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:35,052 INFO L276 IsEmpty]: Start isEmpty. Operand 31752 states and 36870 transitions. [2020-07-21 16:16:35,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:16:35,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:35,083 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] [2020-07-21 16:16:35,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:35,285 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:35,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:35,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1776078785, now seen corresponding path program 1 times [2020-07-21 16:16:35,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:35,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268939793] [2020-07-21 16:16:35,288 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:35,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:35,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:35,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:35,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:35,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:35,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:35,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268939793] [2020-07-21 16:16:35,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:35,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:35,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717640031] [2020-07-21 16:16:35,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:35,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:35,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:35,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:35,351 INFO L87 Difference]: Start difference. First operand 31752 states and 36870 transitions. Second operand 3 states. [2020-07-21 16:16:36,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:36,010 INFO L93 Difference]: Finished difference Result 51210 states and 58887 transitions. [2020-07-21 16:16:36,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:36,010 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 16:16:36,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:36,117 INFO L225 Difference]: With dead ends: 51210 [2020-07-21 16:16:36,117 INFO L226 Difference]: Without dead ends: 51208 [2020-07-21 16:16:36,139 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 [2020-07-21 16:16:36,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51208 states. [2020-07-21 16:16:37,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51208 to 49160. [2020-07-21 16:16:37,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49160 states. [2020-07-21 16:16:37,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49160 states to 49160 states and 55814 transitions. [2020-07-21 16:16:37,526 INFO L78 Accepts]: Start accepts. Automaton has 49160 states and 55814 transitions. Word has length 31 [2020-07-21 16:16:37,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:37,527 INFO L479 AbstractCegarLoop]: Abstraction has 49160 states and 55814 transitions. [2020-07-21 16:16:37,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:37,527 INFO L276 IsEmpty]: Start isEmpty. Operand 49160 states and 55814 transitions. [2020-07-21 16:16:37,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:16:37,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:37,589 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] [2020-07-21 16:16:37,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:37,805 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:37,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:37,806 INFO L82 PathProgramCache]: Analyzing trace with hash 764961535, now seen corresponding path program 1 times [2020-07-21 16:16:37,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:37,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522851080] [2020-07-21 16:16:37,807 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:37,848 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:37,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:37,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:37,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:37,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:37,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:37,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522851080] [2020-07-21 16:16:37,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:37,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:37,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130295270] [2020-07-21 16:16:37,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:37,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:37,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:37,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:37,868 INFO L87 Difference]: Start difference. First operand 49160 states and 55814 transitions. Second operand 3 states. [2020-07-21 16:16:38,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:38,949 INFO L93 Difference]: Finished difference Result 109576 states and 122374 transitions. [2020-07-21 16:16:38,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:38,950 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 16:16:38,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:38,951 INFO L225 Difference]: With dead ends: 109576 [2020-07-21 16:16:38,951 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:16:39,093 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 [2020-07-21 16:16:39,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:16:39,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:16:39,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:16:39,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:16:39,094 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 16:16:39,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:39,094 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:16:39,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:39,095 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:16:39,095 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:16:39,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:39,315 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:16:39,452 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:16:39,453 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:39,453 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:39,453 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:16:39,453 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:16:39,454 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:16:39,454 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-21 16:16:39,456 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-21 16:16:39,457 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-21 16:16:39,457 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-21 16:16:39,457 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-21 16:16:39,458 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-21 16:16:39,458 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,461 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,462 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,462 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,462 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-21 16:16:39,462 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,463 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-21 16:16:39,463 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,463 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,463 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-21 16:16:39,463 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,464 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-21 16:16:39,464 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,464 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,465 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-21 16:16:39,465 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-21 16:16:39,465 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-21 16:16:39,465 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-21 16:16:39,466 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,466 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,466 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-21 16:16:39,467 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-21 16:16:39,467 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-21 16:16:39,467 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,467 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,467 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,468 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,468 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,468 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,468 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,468 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-21 16:16:39,469 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-21 16:16:39,469 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,469 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 16:16:39,469 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-21 16:16:39,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:16:39 BoogieIcfgContainer [2020-07-21 16:16:39,509 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:16:39,515 INFO L168 Benchmark]: Toolchain (without parser) took 28020.62 ms. Allocated memory was 140.5 MB in the beginning and 1.1 GB in the end (delta: 990.9 MB). Free memory was 98.7 MB in the beginning and 268.8 MB in the end (delta: -170.1 MB). Peak memory consumption was 820.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,516 INFO L168 Benchmark]: CDTParser took 0.40 ms. Allocated memory is still 140.5 MB. Free memory was 116.7 MB in the beginning and 116.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,517 INFO L168 Benchmark]: CACSL2BoogieTranslator took 463.51 ms. Allocated memory is still 140.5 MB. Free memory was 98.3 MB in the beginning and 87.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,521 INFO L168 Benchmark]: Boogie Preprocessor took 80.89 ms. Allocated memory was 140.5 MB in the beginning and 179.3 MB in the end (delta: 38.8 MB). Free memory was 87.4 MB in the beginning and 149.1 MB in the end (delta: -61.6 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,521 INFO L168 Benchmark]: RCFGBuilder took 776.89 ms. Allocated memory was 179.3 MB in the beginning and 212.9 MB in the end (delta: 33.6 MB). Free memory was 149.1 MB in the beginning and 177.9 MB in the end (delta: -28.8 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,522 INFO L168 Benchmark]: TraceAbstraction took 26689.50 ms. Allocated memory was 212.9 MB in the beginning and 1.1 GB in the end (delta: 918.6 MB). Free memory was 177.0 MB in the beginning and 268.8 MB in the end (delta: -91.8 MB). Peak memory consumption was 826.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:39,525 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40 ms. Allocated memory is still 140.5 MB. Free memory was 116.7 MB in the beginning and 116.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 463.51 ms. Allocated memory is still 140.5 MB. Free memory was 98.3 MB in the beginning and 87.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 80.89 ms. Allocated memory was 140.5 MB in the beginning and 179.3 MB in the end (delta: 38.8 MB). Free memory was 87.4 MB in the beginning and 149.1 MB in the end (delta: -61.6 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 776.89 ms. Allocated memory was 179.3 MB in the beginning and 212.9 MB in the end (delta: 33.6 MB). Free memory was 149.1 MB in the beginning and 177.9 MB in the end (delta: -28.8 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26689.50 ms. Allocated memory was 212.9 MB in the beginning and 1.1 GB in the end (delta: 918.6 MB). Free memory was 177.0 MB in the beginning and 268.8 MB in the end (delta: -91.8 MB). Peak memory consumption was 826.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 26.3s, OverallIterations: 31, TraceHistogramMax: 1, AutomataDifference: 6.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2877 SDtfs, 1405 SDslu, 1967 SDs, 0 SdLazy, 165 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 777 GetRequests, 746 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49160occurred in iteration=30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 9.3s AutomataMinimizationTime, 31 MinimizatonAttempts, 8224 StatesRemovedByMinimization, 30 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 808 NumberOfCodeBlocks, 808 NumberOfCodeBlocksAsserted, 62 NumberOfCheckSat, 777 ConstructedInterpolants, 0 QuantifiedInterpolants, 39912 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3761 ConjunctsInSsa, 93 ConjunctsInUnsatCore, 31 InterpolantComputations, 31 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...