/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/recursive-simple/fibo_2calls_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:59:18,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:59:18,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:59:18,482 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:59:18,482 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:59:18,484 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:59:18,486 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:59:18,497 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:59:18,503 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:59:18,505 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:59:18,507 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:59:18,509 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:59:18,509 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:59:18,511 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:59:18,513 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:59:18,515 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:59:18,516 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:59:18,517 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:59:18,519 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:59:18,524 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:59:18,529 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:59:18,533 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:59:18,534 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:59:18,534 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:59:18,537 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:59:18,547 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:59:18,547 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:59:18,549 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:59:18,550 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 15:59:18,589 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:59:18,589 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:59:18,593 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:59:18,594 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:59:18,594 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:59:18,594 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:59:18,594 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:59:18,595 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:59:18,596 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:59:18,596 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:59:18,596 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:59:18,597 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:59:18,597 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:59:18,597 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:59:18,598 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:59:18,598 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:59:18,598 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:18,598 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:59:18,598 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:59:18,599 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:59:18,599 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:59:18,599 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:18,599 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:59:18,599 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:59:18,600 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 15:59:18,925 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:59:18,937 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:59:18,940 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:59:18,942 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:59:18,942 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:59:18,943 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_20-2.c [2020-07-21 15:59:19,021 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aec90f803/cb99facbaa704c2683343b0bdf50e229/FLAG97399fb00 [2020-07-21 15:59:19,500 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:59:19,500 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_20-2.c [2020-07-21 15:59:19,508 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aec90f803/cb99facbaa704c2683343b0bdf50e229/FLAG97399fb00 [2020-07-21 15:59:19,885 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aec90f803/cb99facbaa704c2683343b0bdf50e229 [2020-07-21 15:59:19,897 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:59:19,901 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:59:19,902 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:19,902 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:59:19,908 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:59:19,909 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:19" (1/1) ... [2020-07-21 15:59:19,912 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c6c5b15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:19, skipping insertion in model container [2020-07-21 15:59:19,912 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:19" (1/1) ... [2020-07-21 15:59:19,922 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:59:19,943 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:59:20,203 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:20,209 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:59:20,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:20,251 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:59:20,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20 WrapperNode [2020-07-21 15:59:20,252 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:20,253 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:59:20,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:59:20,253 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:59:20,268 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,269 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,375 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,375 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,379 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,382 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,383 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... [2020-07-21 15:59:20,385 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:59:20,385 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:59:20,386 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:59:20,386 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:59:20,387 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:20,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:59:20,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:59:20,461 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 15:59:20,461 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 15:59:20,462 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:59:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:59:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:59:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 15:59:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 15:59:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:59:20,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:59:20,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:59:20,663 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:59:20,663 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:59:20,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:20 BoogieIcfgContainer [2020-07-21 15:59:20,671 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:59:20,672 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:59:20,672 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:59:20,676 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:59:20,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:59:19" (1/3) ... [2020-07-21 15:59:20,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31b0e8c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:20, skipping insertion in model container [2020-07-21 15:59:20,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:20" (2/3) ... [2020-07-21 15:59:20,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31b0e8c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:20, skipping insertion in model container [2020-07-21 15:59:20,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:20" (3/3) ... [2020-07-21 15:59:20,682 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_20-2.c [2020-07-21 15:59:20,695 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:59:20,708 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:59:20,722 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:59:20,749 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:59:20,750 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:59:20,750 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:59:20,750 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:59:20,750 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:59:20,751 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:59:20,751 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:59:20,751 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:59:20,772 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 15:59:20,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:59:20,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:20,780 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:20,781 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:20,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:20,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 15:59:20,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:20,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184217172] [2020-07-21 15:59:20,801 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 15:59:20,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:20,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:20,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:20,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:20,994 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 15:59:20,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:20,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184217172] [2020-07-21 15:59:20,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:20,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:20,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691427644] [2020-07-21 15:59:21,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:21,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:21,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:21,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:21,026 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 15:59:21,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:21,156 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 15:59:21,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:21,159 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:59:21,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:21,171 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:59:21,171 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:59:21,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:21,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:59:21,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 15:59:21,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:21,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:21,227 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 15:59:21,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:21,228 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:21,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:21,229 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:21,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:59:21,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:21,231 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:21,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:21,446 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:21,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:21,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 15:59:21,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:21,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018812697] [2020-07-21 15:59:21,450 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 15:59:21,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:21,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:21,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:21,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:21,550 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 15:59:21,551 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:21,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018812697] [2020-07-21 15:59:21,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:21,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:21,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052509947] [2020-07-21 15:59:21,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:21,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:21,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:21,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:21,561 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 15:59:21,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:21,664 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 15:59:21,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:21,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:59:21,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:21,668 INFO L225 Difference]: With dead ends: 36 [2020-07-21 15:59:21,668 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 15:59:21,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:59:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 15:59:21,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 15:59:21,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:21,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:21,686 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 15:59:21,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:21,688 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:21,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:21,689 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:21,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:59:21,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:21,691 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:21,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:21,892 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:21,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:21,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 15:59:21,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:21,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629948204] [2020-07-21 15:59:21,896 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 15:59:21,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:21,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:21,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:21,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:22,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:22,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:22,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:22,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:22,258 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:22,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [629948204] [2020-07-21 15:59:22,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:22,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:22,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701741984] [2020-07-21 15:59:22,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:22,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:22,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:22,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:22,262 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 15:59:22,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:22,376 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 15:59:22,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:22,377 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:59:22,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:22,379 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:59:22,379 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:59:22,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:22,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:59:22,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 15:59:22,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:22,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:22,392 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 15:59:22,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:22,392 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:22,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:22,393 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:22,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:59:22,395 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:22,395 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:22,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:22,609 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:22,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:22,610 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 15:59:22,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:22,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834152716] [2020-07-21 15:59:22,611 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 15:59:22,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:22,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:22,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:22,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:22,704 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:22,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:22,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:22,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:22,905 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:59:22,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834152716] [2020-07-21 15:59:22,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:22,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:22,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395488100] [2020-07-21 15:59:22,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:22,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:22,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:22,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:22,908 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 15:59:23,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:23,031 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 15:59:23,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:23,031 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 15:59:23,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:23,033 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:59:23,033 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:59:23,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:23,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:59:23,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 15:59:23,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:23,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:23,043 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 15:59:23,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:23,044 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:23,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:23,044 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:23,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:59:23,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:23,047 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:23,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:23,261 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:23,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:23,262 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 15:59:23,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:23,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728648836] [2020-07-21 15:59:23,263 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 15:59:23,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:23,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:23,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:23,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:23,354 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:23,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:23,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:23,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:23,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:23,752 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:23,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728648836] [2020-07-21 15:59:23,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:23,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:23,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310512054] [2020-07-21 15:59:23,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:23,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:23,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:23,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:23,756 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 15:59:23,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:23,955 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 15:59:23,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:23,955 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 15:59:23,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:23,958 INFO L225 Difference]: With dead ends: 51 [2020-07-21 15:59:23,958 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 15:59:23,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:23,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 15:59:23,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 15:59:23,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 15:59:23,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 15:59:23,970 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 15:59:23,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:23,970 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 15:59:23,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:23,971 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 15:59:23,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 15:59:23,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:23,973 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:24,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:24,190 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:24,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:24,191 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 15:59:24,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:24,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176559354] [2020-07-21 15:59:24,192 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 15:59:24,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:24,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:24,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:24,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:24,292 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:24,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:24,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:24,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:24,609 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 15:59:24,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176559354] [2020-07-21 15:59:24,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:24,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:24,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515420543] [2020-07-21 15:59:24,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:24,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:24,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:24,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:24,613 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 15:59:24,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:24,958 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 15:59:24,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:24,958 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 15:59:24,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:24,965 INFO L225 Difference]: With dead ends: 84 [2020-07-21 15:59:24,965 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 15:59:24,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:24,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 15:59:24,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 15:59:24,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 15:59:24,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 15:59:24,997 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 15:59:24,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:24,997 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 15:59:24,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:24,998 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 15:59:25,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:59:25,006 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:25,007 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:25,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:25,212 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:25,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:25,213 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 15:59:25,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:25,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011035411] [2020-07-21 15:59:25,214 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 15:59:25,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:25,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:25,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:25,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:25,306 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 15:59:25,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:25,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:25,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:25,642 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:59:25,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011035411] [2020-07-21 15:59:25,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:25,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:25,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208678631] [2020-07-21 15:59:25,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:25,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:25,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:25,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:25,645 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 15:59:25,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:25,807 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 15:59:25,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:25,808 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 15:59:25,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:25,811 INFO L225 Difference]: With dead ends: 63 [2020-07-21 15:59:25,811 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 15:59:25,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:25,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 15:59:25,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 15:59:25,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 15:59:25,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 15:59:25,825 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 15:59:25,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:25,825 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 15:59:25,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:25,826 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 15:59:25,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 15:59:25,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:25,828 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:26,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:26,039 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:26,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:26,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 15:59:26,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:26,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213351202] [2020-07-21 15:59:26,041 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 15:59:26,077 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:26,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:26,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:26,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:26,152 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:26,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:26,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:26,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:26,385 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 15:59:26,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213351202] [2020-07-21 15:59:26,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:26,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:26,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522018828] [2020-07-21 15:59:26,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:26,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:26,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:26,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:26,392 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 15:59:26,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:26,505 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 15:59:26,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:26,506 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 15:59:26,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:26,508 INFO L225 Difference]: With dead ends: 65 [2020-07-21 15:59:26,508 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 15:59:26,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:26,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 15:59:26,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 15:59:26,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 15:59:26,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 15:59:26,520 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 15:59:26,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:26,521 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 15:59:26,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:26,521 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 15:59:26,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 15:59:26,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:26,523 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:26,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:26,733 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:26,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:26,734 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 15:59:26,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:26,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1645711624] [2020-07-21 15:59:26,736 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 15:59:26,786 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:26,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:26,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:26,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:26,853 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 15:59:26,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:27,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:27,523 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 15:59:27,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1645711624] [2020-07-21 15:59:27,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:27,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:27,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266061463] [2020-07-21 15:59:27,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:27,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:27,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:27,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:27,525 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 15:59:27,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:27,720 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 15:59:27,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:27,721 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 15:59:27,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:27,723 INFO L225 Difference]: With dead ends: 75 [2020-07-21 15:59:27,725 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 15:59:27,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:27,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 15:59:27,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 15:59:27,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 15:59:27,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 15:59:27,740 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 15:59:27,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:27,741 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 15:59:27,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:27,741 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 15:59:27,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 15:59:27,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:27,743 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:27,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:27,958 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:27,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:27,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 15:59:27,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:27,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936777193] [2020-07-21 15:59:27,960 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 15:59:28,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:28,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:28,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:28,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:28,071 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 15:59:28,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:28,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:28,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:28,494 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:28,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936777193] [2020-07-21 15:59:28,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:28,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 15:59:28,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615005817] [2020-07-21 15:59:28,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:28,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:28,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:28,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:28,496 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 15:59:28,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:28,731 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 15:59:28,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:28,731 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 15:59:28,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:28,733 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:28,733 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 15:59:28,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:28,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 15:59:28,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 15:59:28,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 15:59:28,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 15:59:28,748 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 15:59:28,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:28,748 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 15:59:28,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:28,749 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 15:59:28,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:28,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:28,750 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:28,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:28,965 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:28,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:28,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 15:59:28,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:28,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386213580] [2020-07-21 15:59:28,967 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 15:59:29,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:29,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:29,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:29,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:29,116 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:59:29,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:29,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:29,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:29,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:29,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:29,811 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 15:59:29,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386213580] [2020-07-21 15:59:29,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:29,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:29,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136946730] [2020-07-21 15:59:29,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:29,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:29,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:29,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:29,814 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 15:59:30,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:30,237 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 15:59:30,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:30,238 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 15:59:30,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:30,240 INFO L225 Difference]: With dead ends: 131 [2020-07-21 15:59:30,240 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 15:59:30,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:30,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 15:59:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 15:59:30,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 15:59:30,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 15:59:30,252 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 15:59:30,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:30,252 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 15:59:30,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:30,252 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 15:59:30,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 15:59:30,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:30,254 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:30,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:30,467 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:30,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:30,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 15:59:30,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:30,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026474050] [2020-07-21 15:59:30,469 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 15:59:30,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:30,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:30,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:30,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:30,639 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 15:59:30,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:31,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:31,512 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 15:59:31,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026474050] [2020-07-21 15:59:31,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:31,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:31,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588438792] [2020-07-21 15:59:31,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:31,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:31,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:31,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:31,514 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 15:59:32,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:32,406 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 15:59:32,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:59:32,408 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 15:59:32,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:32,412 INFO L225 Difference]: With dead ends: 186 [2020-07-21 15:59:32,412 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 15:59:32,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 15:59:32,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 15:59:32,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 15:59:32,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 15:59:32,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 15:59:32,433 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 15:59:32,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:32,434 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 15:59:32,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:32,434 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 15:59:32,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 15:59:32,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:32,436 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:32,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:32,651 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:32,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:32,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 15:59:32,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:32,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389129959] [2020-07-21 15:59:32,653 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 15:59:32,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:32,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:32,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:32,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 15:59:32,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:33,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:33,278 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 15:59:33,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389129959] [2020-07-21 15:59:33,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:33,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:33,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494229832] [2020-07-21 15:59:33,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:33,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:33,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:33,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:33,280 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 15:59:33,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:33,481 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 15:59:33,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:33,482 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 15:59:33,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:33,483 INFO L225 Difference]: With dead ends: 114 [2020-07-21 15:59:33,484 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 15:59:33,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:33,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 15:59:33,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 15:59:33,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 15:59:33,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 15:59:33,502 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 15:59:33,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:33,502 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 15:59:33,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:33,503 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 15:59:33,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 15:59:33,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:33,505 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:33,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:33,714 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:33,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:33,715 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 15:59:33,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:33,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664423263] [2020-07-21 15:59:33,716 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 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 15:59:33,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:33,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:33,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:33,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:33,852 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 15:59:33,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:34,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:34,579 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 15:59:34,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664423263] [2020-07-21 15:59:34,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:34,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 15:59:34,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538578089] [2020-07-21 15:59:34,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:59:34,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:34,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:59:34,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:59:34,583 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 15:59:35,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:35,091 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 15:59:35,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:59:35,092 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 15:59:35,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:35,096 INFO L225 Difference]: With dead ends: 269 [2020-07-21 15:59:35,096 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 15:59:35,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 15:59:35,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 15:59:35,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 15:59:35,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 15:59:35,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 15:59:35,129 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 15:59:35,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:35,131 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 15:59:35,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:59:35,131 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 15:59:35,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 15:59:35,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:35,135 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:35,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:35,349 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:35,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:35,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 15:59:35,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:35,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057738534] [2020-07-21 15:59:35,350 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 15:59:35,422 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:35,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:35,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:35,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:35,465 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 15:59:35,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:35,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:35,815 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 15:59:35,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057738534] [2020-07-21 15:59:35,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:35,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:35,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632742003] [2020-07-21 15:59:35,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:35,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:35,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:35,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:35,818 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 15:59:35,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:35,995 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 15:59:35,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:35,996 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 15:59:35,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:35,998 INFO L225 Difference]: With dead ends: 167 [2020-07-21 15:59:35,998 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 15:59:35,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:35,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 15:59:36,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 15:59:36,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 15:59:36,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 15:59:36,014 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 15:59:36,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:36,014 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 15:59:36,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:36,015 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 15:59:36,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:36,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:36,019 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:36,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:36,233 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:36,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:36,233 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 15:59:36,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:36,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902080970] [2020-07-21 15:59:36,234 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 15:59:36,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:36,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:36,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:36,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:36,417 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 15:59:36,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:37,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:37,573 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 15:59:37,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902080970] [2020-07-21 15:59:37,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:37,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 15:59:37,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294740074] [2020-07-21 15:59:37,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:59:37,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:37,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:59:37,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:37,576 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 15:59:38,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:38,133 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 15:59:38,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:59:38,134 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 15:59:38,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:38,139 INFO L225 Difference]: With dead ends: 369 [2020-07-21 15:59:38,139 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 15:59:38,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 15:59:38,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 15:59:38,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 15:59:38,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 15:59:38,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 15:59:38,165 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 15:59:38,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:38,165 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 15:59:38,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 15:59:38,165 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 15:59:38,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 15:59:38,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:38,168 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:38,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:38,383 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:38,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:38,383 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 15:59:38,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:38,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518373014] [2020-07-21 15:59:38,384 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 15:59:38,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:38,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:38,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:59:38,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:38,505 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 15:59:38,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:38,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:38,901 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 15:59:38,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518373014] [2020-07-21 15:59:38,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:38,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 15:59:38,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532413735] [2020-07-21 15:59:38,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:59:38,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:38,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:59:38,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 15:59:38,904 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 15:59:39,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:39,052 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 15:59:39,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:59:39,052 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 15:59:39,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:39,055 INFO L225 Difference]: With dead ends: 191 [2020-07-21 15:59:39,056 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 15:59:39,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 15:59:39,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 15:59:39,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 15:59:39,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 15:59:39,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 15:59:39,071 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 15:59:39,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:39,071 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 15:59:39,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:59:39,072 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 15:59:39,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 15:59:39,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:39,075 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:39,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:39,288 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:39,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:39,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 15:59:39,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:39,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [878347033] [2020-07-21 15:59:39,290 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 15:59:39,371 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:39,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:39,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:39,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:39,437 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 15:59:39,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:40,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:40,390 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 15:59:40,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [878347033] [2020-07-21 15:59:40,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:40,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:59:40,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067754947] [2020-07-21 15:59:40,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:59:40,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:40,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:59:40,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:59:40,393 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 15:59:40,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:40,603 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 15:59:40,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:59:40,603 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 15:59:40,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:40,607 INFO L225 Difference]: With dead ends: 206 [2020-07-21 15:59:40,607 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 15:59:40,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:40,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 15:59:40,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 15:59:40,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 15:59:40,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 15:59:40,624 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 15:59:40,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:40,625 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 15:59:40,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:59:40,625 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 15:59:40,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 15:59:40,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:40,628 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:40,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:40,842 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:40,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:40,843 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 15:59:40,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:40,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697677774] [2020-07-21 15:59:40,844 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 15:59:40,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:40,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:40,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:40,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:41,012 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 15:59:41,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:41,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:41,896 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 15:59:41,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697677774] [2020-07-21 15:59:41,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:41,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 15:59:41,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032283402] [2020-07-21 15:59:41,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:59:41,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:41,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:59:41,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 15:59:41,898 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 15:59:42,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:42,228 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 15:59:42,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:59:42,229 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 15:59:42,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:42,232 INFO L225 Difference]: With dead ends: 376 [2020-07-21 15:59:42,232 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 15:59:42,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:59:42,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 15:59:42,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 15:59:42,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 15:59:42,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 15:59:42,248 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-21 15:59:42,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:42,248 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 15:59:42,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:59:42,249 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 15:59:42,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 15:59:42,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:42,252 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:42,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:42,467 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:42,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:42,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-21 15:59:42,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:42,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304311106] [2020-07-21 15:59:42,469 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 15:59:42,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:42,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:42,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:59:42,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:42,726 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 15:59:42,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:43,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:43,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:44,441 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-21 15:59:44,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304311106] [2020-07-21 15:59:44,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:44,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 15:59:44,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427297858] [2020-07-21 15:59:44,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 15:59:44,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:44,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 15:59:44,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 15:59:44,444 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-21 15:59:45,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:45,442 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-21 15:59:45,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 15:59:45,444 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-21 15:59:45,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:45,449 INFO L225 Difference]: With dead ends: 479 [2020-07-21 15:59:45,449 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 15:59:45,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 15:59:45,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 15:59:45,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-21 15:59:45,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 15:59:45,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-21 15:59:45,476 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-21 15:59:45,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:45,477 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-21 15:59:45,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 15:59:45,477 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-21 15:59:45,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 15:59:45,481 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:45,482 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:45,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:45,697 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:45,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:45,697 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 7 times [2020-07-21 15:59:45,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:45,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612185408] [2020-07-21 15:59:45,700 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 15:59:45,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:45,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:45,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:59:45,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:45,976 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 15:59:45,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:46,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:46,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:47,449 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-21 15:59:47,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612185408] [2020-07-21 15:59:47,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:47,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 15:59:47,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739378794] [2020-07-21 15:59:47,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 15:59:47,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:47,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 15:59:47,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 15:59:47,451 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 23 states. [2020-07-21 15:59:48,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:48,275 INFO L93 Difference]: Finished difference Result 491 states and 962 transitions. [2020-07-21 15:59:48,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 15:59:48,276 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-21 15:59:48,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:48,279 INFO L225 Difference]: With dead ends: 491 [2020-07-21 15:59:48,280 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 15:59:48,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 15:59:48,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 15:59:48,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 238. [2020-07-21 15:59:48,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 15:59:48,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 446 transitions. [2020-07-21 15:59:48,306 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 446 transitions. Word has length 136 [2020-07-21 15:59:48,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:48,306 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 446 transitions. [2020-07-21 15:59:48,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 15:59:48,307 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 446 transitions. [2020-07-21 15:59:48,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 15:59:48,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:48,310 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:48,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:48,526 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:48,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:48,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 8 times [2020-07-21 15:59:48,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:48,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143722547] [2020-07-21 15:59:48,527 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 15:59:48,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:48,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:48,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 15:59:48,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:48,726 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 107 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 15:59:48,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:49,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:49,639 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 20 proven. 117 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 15:59:49,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143722547] [2020-07-21 15:59:49,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:49,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 15:59:49,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157961891] [2020-07-21 15:59:49,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:59:49,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:49,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:59:49,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 15:59:49,641 INFO L87 Difference]: Start difference. First operand 238 states and 446 transitions. Second operand 16 states. [2020-07-21 15:59:49,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:49,856 INFO L93 Difference]: Finished difference Result 245 states and 456 transitions. [2020-07-21 15:59:49,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 15:59:49,859 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 15:59:49,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:49,861 INFO L225 Difference]: With dead ends: 245 [2020-07-21 15:59:49,861 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 15:59:49,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 15:59:49,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 15:59:49,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 233. [2020-07-21 15:59:49,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 15:59:49,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 432 transitions. [2020-07-21 15:59:49,882 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 432 transitions. Word has length 109 [2020-07-21 15:59:49,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:49,883 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 432 transitions. [2020-07-21 15:59:49,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:59:49,883 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 432 transitions. [2020-07-21 15:59:49,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-07-21 15:59:49,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:49,887 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:50,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:50,101 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:50,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:50,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1569040385, now seen corresponding path program 2 times [2020-07-21 15:59:50,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:50,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064988816] [2020-07-21 15:59:50,103 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 15:59:50,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:50,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:50,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:59:50,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:50,320 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 115 proven. 75 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 15:59:50,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:50,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:50,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:51,270 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 115 proven. 78 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2020-07-21 15:59:51,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2064988816] [2020-07-21 15:59:51,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:51,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 15:59:51,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831379704] [2020-07-21 15:59:51,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:59:51,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:51,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:59:51,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 15:59:51,272 INFO L87 Difference]: Start difference. First operand 233 states and 432 transitions. Second operand 19 states. [2020-07-21 15:59:51,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:51,753 INFO L93 Difference]: Finished difference Result 491 states and 970 transitions. [2020-07-21 15:59:51,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:59:51,754 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 119 [2020-07-21 15:59:51,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:51,758 INFO L225 Difference]: With dead ends: 491 [2020-07-21 15:59:51,758 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 15:59:51,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 208 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 15:59:51,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 15:59:51,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 244. [2020-07-21 15:59:51,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 15:59:51,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 440 transitions. [2020-07-21 15:59:51,782 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 440 transitions. Word has length 119 [2020-07-21 15:59:51,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:51,782 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 440 transitions. [2020-07-21 15:59:51,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:59:51,782 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 440 transitions. [2020-07-21 15:59:51,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 15:59:51,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:51,786 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:51,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:52,000 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:52,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:52,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 9 times [2020-07-21 15:59:52,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:52,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480255831] [2020-07-21 15:59:52,001 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 15:59:52,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:52,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:52,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:52,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:52,201 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-21 15:59:52,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:52,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:52,865 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-21 15:59:52,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480255831] [2020-07-21 15:59:52,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:52,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:52,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106666609] [2020-07-21 15:59:52,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:52,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:52,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:52,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:52,867 INFO L87 Difference]: Start difference. First operand 244 states and 440 transitions. Second operand 14 states. [2020-07-21 15:59:53,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:53,048 INFO L93 Difference]: Finished difference Result 288 states and 547 transitions. [2020-07-21 15:59:53,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:53,049 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 15:59:53,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:53,054 INFO L225 Difference]: With dead ends: 288 [2020-07-21 15:59:53,055 INFO L226 Difference]: Without dead ends: 284 [2020-07-21 15:59:53,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:53,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2020-07-21 15:59:53,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 257. [2020-07-21 15:59:53,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 15:59:53,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 468 transitions. [2020-07-21 15:59:53,094 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 468 transitions. Word has length 121 [2020-07-21 15:59:53,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:53,096 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 468 transitions. [2020-07-21 15:59:53,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:53,096 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 468 transitions. [2020-07-21 15:59:53,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 15:59:53,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:53,101 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:53,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:53,316 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:53,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:53,316 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 3 times [2020-07-21 15:59:53,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:53,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331297333] [2020-07-21 15:59:53,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:59:53,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:53,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:53,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:53,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:53,518 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 92 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2020-07-21 15:59:53,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:53,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:54,222 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 97 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2020-07-21 15:59:54,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331297333] [2020-07-21 15:59:54,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:54,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:54,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144650426] [2020-07-21 15:59:54,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:54,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:54,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:54,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:54,224 INFO L87 Difference]: Start difference. First operand 257 states and 468 transitions. Second operand 14 states. [2020-07-21 15:59:54,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:54,406 INFO L93 Difference]: Finished difference Result 290 states and 565 transitions. [2020-07-21 15:59:54,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:54,407 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-21 15:59:54,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:54,411 INFO L225 Difference]: With dead ends: 290 [2020-07-21 15:59:54,411 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 15:59:54,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:54,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 15:59:54,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 257. [2020-07-21 15:59:54,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 15:59:54,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 468 transitions. [2020-07-21 15:59:54,440 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 468 transitions. Word has length 145 [2020-07-21 15:59:54,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:54,441 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 468 transitions. [2020-07-21 15:59:54,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:54,441 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 468 transitions. [2020-07-21 15:59:54,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-07-21 15:59:54,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:54,446 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:54,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:54,661 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:54,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:54,661 INFO L82 PathProgramCache]: Analyzing trace with hash -146170438, now seen corresponding path program 4 times [2020-07-21 15:59:54,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:54,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869583247] [2020-07-21 15:59:54,662 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 15:59:54,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:54,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:54,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 15:59:54,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:54,901 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 139 proven. 46 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2020-07-21 15:59:54,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:55,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:55,666 INFO L134 CoverageAnalysis]: Checked inductivity of 614 backedges. 141 proven. 49 refuted. 0 times theorem prover too weak. 424 trivial. 0 not checked. [2020-07-21 15:59:55,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869583247] [2020-07-21 15:59:55,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:55,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 15:59:55,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991712623] [2020-07-21 15:59:55,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:59:55,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:55,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:59:55,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 15:59:55,668 INFO L87 Difference]: Start difference. First operand 257 states and 468 transitions. Second operand 14 states. [2020-07-21 15:59:55,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:55,858 INFO L93 Difference]: Finished difference Result 267 states and 484 transitions. [2020-07-21 15:59:55,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:59:55,858 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 157 [2020-07-21 15:59:55,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:55,862 INFO L225 Difference]: With dead ends: 267 [2020-07-21 15:59:55,862 INFO L226 Difference]: Without dead ends: 263 [2020-07-21 15:59:55,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 295 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 15:59:55,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2020-07-21 15:59:55,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 257. [2020-07-21 15:59:55,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2020-07-21 15:59:55,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 468 transitions. [2020-07-21 15:59:55,881 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 468 transitions. Word has length 157 [2020-07-21 15:59:55,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:55,881 INFO L479 AbstractCegarLoop]: Abstraction has 257 states and 468 transitions. [2020-07-21 15:59:55,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:59:55,882 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 468 transitions. [2020-07-21 15:59:55,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2020-07-21 15:59:55,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:55,886 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 17, 17, 14, 13, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:56,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:56,101 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:56,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:56,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1358383441, now seen corresponding path program 10 times [2020-07-21 15:59:56,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:56,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485832084] [2020-07-21 15:59:56,101 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 15:59:56,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:59:56,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:56,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:59:56,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:56,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 285 proven. 518 refuted. 0 times theorem prover too weak. 962 trivial. 0 not checked. [2020-07-21 15:59:56,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:57,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:57,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:58,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 287 proven. 536 refuted. 0 times theorem prover too weak. 942 trivial. 0 not checked. [2020-07-21 15:59:59,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485832084] [2020-07-21 15:59:59,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:59,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-21 15:59:59,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937810847] [2020-07-21 15:59:59,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 15:59:59,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:59,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 15:59:59,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-21 15:59:59,232 INFO L87 Difference]: Start difference. First operand 257 states and 468 transitions. Second operand 29 states. [2020-07-21 16:00:00,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:00,805 INFO L93 Difference]: Finished difference Result 596 states and 1221 transitions. [2020-07-21 16:00:00,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:00:00,806 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 256 [2020-07-21 16:00:00,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:00,813 INFO L225 Difference]: With dead ends: 596 [2020-07-21 16:00:00,814 INFO L226 Difference]: Without dead ends: 345 [2020-07-21 16:00:00,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 536 GetRequests, 465 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=2402, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:00:00,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2020-07-21 16:00:00,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 287. [2020-07-21 16:00:00,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 16:00:00,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 561 transitions. [2020-07-21 16:00:00,854 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 561 transitions. Word has length 256 [2020-07-21 16:00:00,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:00,855 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 561 transitions. [2020-07-21 16:00:00,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:00:00,855 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 561 transitions. [2020-07-21 16:00:00,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:00:00,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:00,859 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 16, 16, 11, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:01,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:01,074 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:01,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:01,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1238926714, now seen corresponding path program 5 times [2020-07-21 16:00:01,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:01,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419263118] [2020-07-21 16:00:01,075 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 16:00:01,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:01,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:01,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:01,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:01,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1511 backedges. 803 proven. 144 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-21 16:00:01,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:02,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1511 backedges. 243 proven. 290 refuted. 0 times theorem prover too weak. 978 trivial. 0 not checked. [2020-07-21 16:00:03,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1419263118] [2020-07-21 16:00:03,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:03,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:03,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721865439] [2020-07-21 16:00:03,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:03,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:03,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:03,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:03,011 INFO L87 Difference]: Start difference. First operand 287 states and 561 transitions. Second operand 19 states. [2020-07-21 16:00:03,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:03,643 INFO L93 Difference]: Finished difference Result 666 states and 1423 transitions. [2020-07-21 16:00:03,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:00:03,644 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-21 16:00:03,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:03,648 INFO L225 Difference]: With dead ends: 666 [2020-07-21 16:00:03,648 INFO L226 Difference]: Without dead ends: 362 [2020-07-21 16:00:03,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 444 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:00:03,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-21 16:00:03,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 306. [2020-07-21 16:00:03,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2020-07-21 16:00:03,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 619 transitions. [2020-07-21 16:00:03,677 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 619 transitions. Word has length 237 [2020-07-21 16:00:03,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:03,677 INFO L479 AbstractCegarLoop]: Abstraction has 306 states and 619 transitions. [2020-07-21 16:00:03,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:03,677 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 619 transitions. [2020-07-21 16:00:03,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2020-07-21 16:00:03,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:03,682 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:03,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:03,895 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:03,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:03,895 INFO L82 PathProgramCache]: Analyzing trace with hash 883783223, now seen corresponding path program 5 times [2020-07-21 16:00:03,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:03,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703217993] [2020-07-21 16:00:03,896 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 16:00:04,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:04,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:04,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:04,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:04,192 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 439 proven. 86 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 16:00:04,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:05,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:05,653 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 99 proven. 237 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2020-07-21 16:00:05,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703217993] [2020-07-21 16:00:05,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:05,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:05,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376140065] [2020-07-21 16:00:05,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:05,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:05,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:05,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:05,657 INFO L87 Difference]: Start difference. First operand 306 states and 619 transitions. Second operand 19 states. [2020-07-21 16:00:06,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:06,196 INFO L93 Difference]: Finished difference Result 669 states and 1423 transitions. [2020-07-21 16:00:06,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:06,197 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 172 [2020-07-21 16:00:06,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:06,201 INFO L225 Difference]: With dead ends: 669 [2020-07-21 16:00:06,202 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 16:00:06,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 314 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:06,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 16:00:06,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 330. [2020-07-21 16:00:06,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-07-21 16:00:06,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 648 transitions. [2020-07-21 16:00:06,232 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 648 transitions. Word has length 172 [2020-07-21 16:00:06,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:06,232 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 648 transitions. [2020-07-21 16:00:06,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:06,232 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 648 transitions. [2020-07-21 16:00:06,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2020-07-21 16:00:06,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:06,237 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:06,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:06,451 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:06,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:06,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1656470305, now seen corresponding path program 6 times [2020-07-21 16:00:06,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:06,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250811949] [2020-07-21 16:00:06,453 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 16:00:06,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:06,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:06,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:06,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:06,782 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 138 proven. 240 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-07-21 16:00:06,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:07,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:07,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,551 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 138 proven. 250 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-07-21 16:00:08,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250811949] [2020-07-21 16:00:08,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:08,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:08,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074463278] [2020-07-21 16:00:08,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:08,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:08,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:08,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:08,553 INFO L87 Difference]: Start difference. First operand 330 states and 648 transitions. Second operand 23 states. [2020-07-21 16:00:09,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:09,504 INFO L93 Difference]: Finished difference Result 703 states and 1405 transitions. [2020-07-21 16:00:09,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:09,505 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 171 [2020-07-21 16:00:09,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:09,512 INFO L225 Difference]: With dead ends: 703 [2020-07-21 16:00:09,512 INFO L226 Difference]: Without dead ends: 379 [2020-07-21 16:00:09,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 304 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=274, Invalid=1286, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:00:09,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-07-21 16:00:09,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 351. [2020-07-21 16:00:09,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-21 16:00:09,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 690 transitions. [2020-07-21 16:00:09,555 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 690 transitions. Word has length 171 [2020-07-21 16:00:09,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:09,555 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 690 transitions. [2020-07-21 16:00:09,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:09,556 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 690 transitions. [2020-07-21 16:00:09,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 16:00:09,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:09,562 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:09,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:09,777 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:09,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:09,777 INFO L82 PathProgramCache]: Analyzing trace with hash -754125023, now seen corresponding path program 4 times [2020-07-21 16:00:09,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:09,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474081655] [2020-07-21 16:00:09,778 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 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 16:00:09,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:09,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:09,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:09,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:10,050 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 235 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2020-07-21 16:00:10,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:11,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,676 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 249 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2020-07-21 16:00:11,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474081655] [2020-07-21 16:00:11,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:11,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:11,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909007222] [2020-07-21 16:00:11,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:11,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:11,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:11,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:11,678 INFO L87 Difference]: Start difference. First operand 351 states and 690 transitions. Second operand 18 states. [2020-07-21 16:00:11,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:11,964 INFO L93 Difference]: Finished difference Result 361 states and 704 transitions. [2020-07-21 16:00:11,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:11,965 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 169 [2020-07-21 16:00:11,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:11,969 INFO L225 Difference]: With dead ends: 361 [2020-07-21 16:00:11,970 INFO L226 Difference]: Without dead ends: 357 [2020-07-21 16:00:11,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 311 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:11,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2020-07-21 16:00:11,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 338. [2020-07-21 16:00:11,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-21 16:00:11,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 657 transitions. [2020-07-21 16:00:11,995 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 657 transitions. Word has length 169 [2020-07-21 16:00:11,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:11,996 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 657 transitions. [2020-07-21 16:00:11,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:11,996 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 657 transitions. [2020-07-21 16:00:12,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-21 16:00:12,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:12,000 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 12, 11, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:12,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:12,216 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:12,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:12,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1757832939, now seen corresponding path program 11 times [2020-07-21 16:00:12,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:12,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1171560173] [2020-07-21 16:00:12,217 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:12,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:12,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:12,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:12,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:12,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 916 proven. 129 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-21 16:00:12,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:13,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:13,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 285 proven. 283 refuted. 0 times theorem prover too weak. 1137 trivial. 0 not checked. [2020-07-21 16:00:14,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1171560173] [2020-07-21 16:00:14,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:14,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:00:14,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132004645] [2020-07-21 16:00:14,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:14,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:14,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:14,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:14,153 INFO L87 Difference]: Start difference. First operand 338 states and 657 transitions. Second operand 19 states. [2020-07-21 16:00:14,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:14,739 INFO L93 Difference]: Finished difference Result 855 states and 1830 transitions. [2020-07-21 16:00:14,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:00:14,739 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 252 [2020-07-21 16:00:14,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:14,744 INFO L225 Difference]: With dead ends: 855 [2020-07-21 16:00:14,745 INFO L226 Difference]: Without dead ends: 450 [2020-07-21 16:00:14,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 473 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=194, Invalid=798, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:00:14,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-21 16:00:14,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 378. [2020-07-21 16:00:14,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2020-07-21 16:00:14,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 757 transitions. [2020-07-21 16:00:14,780 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 757 transitions. Word has length 252 [2020-07-21 16:00:14,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:14,780 INFO L479 AbstractCegarLoop]: Abstraction has 378 states and 757 transitions. [2020-07-21 16:00:14,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:14,780 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 757 transitions. [2020-07-21 16:00:14,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-07-21 16:00:14,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:14,787 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:15,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:15,020 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:15,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:15,021 INFO L82 PathProgramCache]: Analyzing trace with hash 796076893, now seen corresponding path program 12 times [2020-07-21 16:00:15,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:15,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529224159] [2020-07-21 16:00:15,021 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:15,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:15,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:15,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:15,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:15,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 1002 proven. 300 refuted. 0 times theorem prover too weak. 803 trivial. 0 not checked. [2020-07-21 16:00:15,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:16,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2105 backedges. 272 proven. 507 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2020-07-21 16:00:17,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529224159] [2020-07-21 16:00:17,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:17,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:17,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123475712] [2020-07-21 16:00:17,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:17,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:17,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:17,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:17,974 INFO L87 Difference]: Start difference. First operand 378 states and 757 transitions. Second operand 23 states. [2020-07-21 16:00:18,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:18,720 INFO L93 Difference]: Finished difference Result 836 states and 1803 transitions. [2020-07-21 16:00:18,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:00:18,720 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 277 [2020-07-21 16:00:18,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:18,727 INFO L225 Difference]: With dead ends: 836 [2020-07-21 16:00:18,727 INFO L226 Difference]: Without dead ends: 456 [2020-07-21 16:00:18,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 568 GetRequests, 515 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:00:18,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2020-07-21 16:00:18,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 398. [2020-07-21 16:00:18,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 16:00:18,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 792 transitions. [2020-07-21 16:00:18,767 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 792 transitions. Word has length 277 [2020-07-21 16:00:18,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:18,767 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 792 transitions. [2020-07-21 16:00:18,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:18,767 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 792 transitions. [2020-07-21 16:00:18,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2020-07-21 16:00:18,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:18,772 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 8, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:19,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:19,007 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:19,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:19,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1788289347, now seen corresponding path program 13 times [2020-07-21 16:00:19,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:19,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21311272] [2020-07-21 16:00:19,009 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:19,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:19,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:19,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:19,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:19,403 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 466 proven. 94 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2020-07-21 16:00:19,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:20,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:21,153 INFO L134 CoverageAnalysis]: Checked inductivity of 769 backedges. 118 proven. 271 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2020-07-21 16:00:21,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21311272] [2020-07-21 16:00:21,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:21,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:21,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851180811] [2020-07-21 16:00:21,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:21,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:21,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:21,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:21,155 INFO L87 Difference]: Start difference. First operand 398 states and 792 transitions. Second operand 21 states. [2020-07-21 16:00:21,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:21,768 INFO L93 Difference]: Finished difference Result 776 states and 1570 transitions. [2020-07-21 16:00:21,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:00:21,769 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 175 [2020-07-21 16:00:21,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:21,774 INFO L225 Difference]: With dead ends: 776 [2020-07-21 16:00:21,774 INFO L226 Difference]: Without dead ends: 379 [2020-07-21 16:00:21,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 315 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:00:21,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-07-21 16:00:21,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 369. [2020-07-21 16:00:21,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2020-07-21 16:00:21,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 669 transitions. [2020-07-21 16:00:21,804 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 669 transitions. Word has length 175 [2020-07-21 16:00:21,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:21,805 INFO L479 AbstractCegarLoop]: Abstraction has 369 states and 669 transitions. [2020-07-21 16:00:21,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:21,805 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 669 transitions. [2020-07-21 16:00:21,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2020-07-21 16:00:21,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:21,809 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 9, 8, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:22,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:22,023 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:22,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:22,024 INFO L82 PathProgramCache]: Analyzing trace with hash 990260059, now seen corresponding path program 14 times [2020-07-21 16:00:22,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:22,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396703324] [2020-07-21 16:00:22,024 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:22,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:22,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:22,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:00:22,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 173 proven. 246 refuted. 0 times theorem prover too weak. 341 trivial. 0 not checked. [2020-07-21 16:00:22,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:23,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:24,574 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 173 proven. 260 refuted. 0 times theorem prover too weak. 327 trivial. 0 not checked. [2020-07-21 16:00:24,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396703324] [2020-07-21 16:00:24,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:24,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:00:24,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632051710] [2020-07-21 16:00:24,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:24,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:24,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:24,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:24,576 INFO L87 Difference]: Start difference. First operand 369 states and 669 transitions. Second operand 25 states. [2020-07-21 16:00:25,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:25,490 INFO L93 Difference]: Finished difference Result 773 states and 1494 transitions. [2020-07-21 16:00:25,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:00:25,491 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 174 [2020-07-21 16:00:25,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:25,495 INFO L225 Difference]: With dead ends: 773 [2020-07-21 16:00:25,495 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 16:00:25,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 305 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:00:25,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 16:00:25,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 373. [2020-07-21 16:00:25,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2020-07-21 16:00:25,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 661 transitions. [2020-07-21 16:00:25,523 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 661 transitions. Word has length 174 [2020-07-21 16:00:25,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:25,524 INFO L479 AbstractCegarLoop]: Abstraction has 373 states and 661 transitions. [2020-07-21 16:00:25,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:25,524 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 661 transitions. [2020-07-21 16:00:25,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:00:25,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:25,528 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:25,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:25,741 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:25,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:25,742 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 15 times [2020-07-21 16:00:25,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:25,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384522061] [2020-07-21 16:00:25,743 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:25,997 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:25,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:25,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:26,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:26,111 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 260 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-21 16:00:26,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:27,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:27,760 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 45 proven. 276 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-07-21 16:00:27,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384522061] [2020-07-21 16:00:27,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:27,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:00:27,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113507266] [2020-07-21 16:00:27,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:00:27,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:27,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:00:27,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:27,763 INFO L87 Difference]: Start difference. First operand 373 states and 661 transitions. Second operand 18 states. [2020-07-21 16:00:28,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:28,017 INFO L93 Difference]: Finished difference Result 382 states and 673 transitions. [2020-07-21 16:00:28,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:00:28,018 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 177 [2020-07-21 16:00:28,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:28,023 INFO L225 Difference]: With dead ends: 382 [2020-07-21 16:00:28,023 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 16:00:28,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 325 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:00:28,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 16:00:28,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 375. [2020-07-21 16:00:28,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 375 states. [2020-07-21 16:00:28,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 664 transitions. [2020-07-21 16:00:28,054 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 664 transitions. Word has length 177 [2020-07-21 16:00:28,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:28,055 INFO L479 AbstractCegarLoop]: Abstraction has 375 states and 664 transitions. [2020-07-21 16:00:28,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:00:28,055 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 664 transitions. [2020-07-21 16:00:28,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:00:28,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:28,059 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:28,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,272 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:28,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:28,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1803358882, now seen corresponding path program 16 times [2020-07-21 16:00:28,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:28,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654752056] [2020-07-21 16:00:28,273 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:28,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:28,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:28,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 212 refuted. 0 times theorem prover too weak. 627 trivial. 0 not checked. [2020-07-21 16:00:28,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:29,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:29,885 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 79 proven. 222 refuted. 0 times theorem prover too weak. 617 trivial. 0 not checked. [2020-07-21 16:00:29,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654752056] [2020-07-21 16:00:29,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:29,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:29,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716343285] [2020-07-21 16:00:29,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:29,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:29,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:29,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:29,887 INFO L87 Difference]: Start difference. First operand 375 states and 664 transitions. Second operand 16 states. [2020-07-21 16:00:30,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:30,115 INFO L93 Difference]: Finished difference Result 412 states and 742 transitions. [2020-07-21 16:00:30,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:30,116 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 189 [2020-07-21 16:00:30,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:30,120 INFO L225 Difference]: With dead ends: 412 [2020-07-21 16:00:30,120 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 16:00:30,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 353 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:30,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 16:00:30,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 383. [2020-07-21 16:00:30,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-07-21 16:00:30,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 682 transitions. [2020-07-21 16:00:30,146 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 682 transitions. Word has length 189 [2020-07-21 16:00:30,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:30,146 INFO L479 AbstractCegarLoop]: Abstraction has 383 states and 682 transitions. [2020-07-21 16:00:30,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:30,147 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 682 transitions. [2020-07-21 16:00:30,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:00:30,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,151 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:30,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,364 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:30,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:30,364 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 17 times [2020-07-21 16:00:30,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:30,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806245949] [2020-07-21 16:00:30,365 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:30,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:30,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:30,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:30,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-21 16:00:30,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:31,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-21 16:00:32,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806245949] [2020-07-21 16:00:32,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:32,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864971803] [2020-07-21 16:00:32,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:32,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:32,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:32,075 INFO L87 Difference]: Start difference. First operand 383 states and 682 transitions. Second operand 16 states. [2020-07-21 16:00:32,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:32,311 INFO L93 Difference]: Finished difference Result 436 states and 800 transitions. [2020-07-21 16:00:32,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:32,312 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-21 16:00:32,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:32,318 INFO L225 Difference]: With dead ends: 436 [2020-07-21 16:00:32,318 INFO L226 Difference]: Without dead ends: 432 [2020-07-21 16:00:32,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:32,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-21 16:00:32,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 383. [2020-07-21 16:00:32,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 383 states. [2020-07-21 16:00:32,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 682 transitions. [2020-07-21 16:00:32,346 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 682 transitions. Word has length 201 [2020-07-21 16:00:32,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:32,346 INFO L479 AbstractCegarLoop]: Abstraction has 383 states and 682 transitions. [2020-07-21 16:00:32,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:32,346 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 682 transitions. [2020-07-21 16:00:32,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2020-07-21 16:00:32,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:32,350 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 11, 11, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:32,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:32,565 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:32,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:32,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1357299038, now seen corresponding path program 18 times [2020-07-21 16:00:32,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:32,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324785407] [2020-07-21 16:00:32,567 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:32,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:32,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:32,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:32,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:32,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 712 proven. 94 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2020-07-21 16:00:32,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:34,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 155 proven. 386 refuted. 0 times theorem prover too weak. 665 trivial. 0 not checked. [2020-07-21 16:00:35,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324785407] [2020-07-21 16:00:35,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:35,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806512759] [2020-07-21 16:00:35,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:35,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:35,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:35,188 INFO L87 Difference]: Start difference. First operand 383 states and 682 transitions. Second operand 21 states. [2020-07-21 16:00:35,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,915 INFO L93 Difference]: Finished difference Result 799 states and 1475 transitions. [2020-07-21 16:00:35,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:00:35,915 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 215 [2020-07-21 16:00:35,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,920 INFO L225 Difference]: With dead ends: 799 [2020-07-21 16:00:35,920 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 16:00:35,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 395 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:00:35,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 16:00:35,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 371. [2020-07-21 16:00:35,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 371 states. [2020-07-21 16:00:35,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 646 transitions. [2020-07-21 16:00:35,945 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 646 transitions. Word has length 215 [2020-07-21 16:00:35,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,945 INFO L479 AbstractCegarLoop]: Abstraction has 371 states and 646 transitions. [2020-07-21 16:00:35,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:35,946 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 646 transitions. [2020-07-21 16:00:35,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-21 16:00:35,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,949 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:36,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,165 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:36,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:36,166 INFO L82 PathProgramCache]: Analyzing trace with hash 124404788, now seen corresponding path program 19 times [2020-07-21 16:00:36,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:36,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669121521] [2020-07-21 16:00:36,167 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:36,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:36,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:36,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:36,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 172 proven. 159 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 16:00:36,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:37,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 174 proven. 167 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 16:00:38,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669121521] [2020-07-21 16:00:38,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:38,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:38,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28153404] [2020-07-21 16:00:38,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:38,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:38,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:38,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:38,019 INFO L87 Difference]: Start difference. First operand 371 states and 646 transitions. Second operand 16 states. [2020-07-21 16:00:38,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:38,246 INFO L93 Difference]: Finished difference Result 381 states and 660 transitions. [2020-07-21 16:00:38,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:38,247 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 213 [2020-07-21 16:00:38,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:38,252 INFO L225 Difference]: With dead ends: 381 [2020-07-21 16:00:38,252 INFO L226 Difference]: Without dead ends: 377 [2020-07-21 16:00:38,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 401 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:38,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-07-21 16:00:38,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 366. [2020-07-21 16:00:38,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 16:00:38,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 637 transitions. [2020-07-21 16:00:38,272 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 637 transitions. Word has length 213 [2020-07-21 16:00:38,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:38,272 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 637 transitions. [2020-07-21 16:00:38,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:38,273 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 637 transitions. [2020-07-21 16:00:38,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 16:00:38,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:38,276 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 15, 15, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,490 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,491 INFO L82 PathProgramCache]: Analyzing trace with hash 51685547, now seen corresponding path program 20 times [2020-07-21 16:00:38,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:38,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707069697] [2020-07-21 16:00:38,492 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:38,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:38,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:38,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 133 refuted. 0 times theorem prover too weak. 1057 trivial. 0 not checked. [2020-07-21 16:00:38,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:39,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 138 refuted. 0 times theorem prover too weak. 1052 trivial. 0 not checked. [2020-07-21 16:00:39,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707069697] [2020-07-21 16:00:40,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:40,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:40,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660613507] [2020-07-21 16:00:40,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:40,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:40,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:40,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:40,001 INFO L87 Difference]: Start difference. First operand 366 states and 637 transitions. Second operand 14 states. [2020-07-21 16:00:40,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:40,217 INFO L93 Difference]: Finished difference Result 412 states and 755 transitions. [2020-07-21 16:00:40,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:40,218 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 225 [2020-07-21 16:00:40,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:40,222 INFO L225 Difference]: With dead ends: 412 [2020-07-21 16:00:40,223 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 16:00:40,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 429 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:40,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 16:00:40,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 372. [2020-07-21 16:00:40,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 16:00:40,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 661 transitions. [2020-07-21 16:00:40,243 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 661 transitions. Word has length 225 [2020-07-21 16:00:40,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:40,243 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 661 transitions. [2020-07-21 16:00:40,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:40,244 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 661 transitions. [2020-07-21 16:00:40,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:00:40,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:40,247 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:40,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,458 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:40,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:40,459 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 21 times [2020-07-21 16:00:40,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:40,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577271792] [2020-07-21 16:00:40,460 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:40,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:40,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:40,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:40,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 301 proven. 76 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-21 16:00:40,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:41,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 303 proven. 84 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-21 16:00:42,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577271792] [2020-07-21 16:00:42,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:42,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:42,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155010007] [2020-07-21 16:00:42,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:42,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:42,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:42,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:42,473 INFO L87 Difference]: Start difference. First operand 372 states and 661 transitions. Second operand 16 states. [2020-07-21 16:00:42,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:42,713 INFO L93 Difference]: Finished difference Result 382 states and 675 transitions. [2020-07-21 16:00:42,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:42,714 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-21 16:00:42,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:42,718 INFO L225 Difference]: With dead ends: 382 [2020-07-21 16:00:42,718 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 16:00:42,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:42,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 16:00:42,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 372. [2020-07-21 16:00:42,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-21 16:00:42,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 661 transitions. [2020-07-21 16:00:42,735 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 661 transitions. Word has length 237 [2020-07-21 16:00:42,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:42,736 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 661 transitions. [2020-07-21 16:00:42,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:42,736 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 661 transitions. [2020-07-21 16:00:42,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-21 16:00:42,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:42,740 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 21, 21, 18, 16, 15, 15, 15, 15, 15, 15, 15, 12, 10, 10, 10, 10, 10, 10, 10, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:42,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:42,948 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:42,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:42,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978344, now seen corresponding path program 22 times [2020-07-21 16:00:42,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:42,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408874628] [2020-07-21 16:00:42,950 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:43,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:43,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:43,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:00:43,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:43,589 INFO L134 CoverageAnalysis]: Checked inductivity of 3366 backedges. 461 proven. 767 refuted. 0 times theorem prover too weak. 2138 trivial. 0 not checked. [2020-07-21 16:00:43,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:45,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3366 backedges. 461 proven. 791 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 16:00:47,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408874628] [2020-07-21 16:00:47,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:00:47,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916026794] [2020-07-21 16:00:47,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:00:47,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:00:47,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:00:47,750 INFO L87 Difference]: Start difference. First operand 372 states and 661 transitions. Second operand 29 states. [2020-07-21 16:00:49,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:49,241 INFO L93 Difference]: Finished difference Result 799 states and 1452 transitions. [2020-07-21 16:00:49,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-21 16:00:49,242 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 341 [2020-07-21 16:00:49,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:49,246 INFO L225 Difference]: With dead ends: 799 [2020-07-21 16:00:49,246 INFO L226 Difference]: Without dead ends: 432 [2020-07-21 16:00:49,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 705 GetRequests, 631 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=443, Invalid=2313, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:00:49,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-21 16:00:49,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 368. [2020-07-21 16:00:49,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 16:00:49,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 662 transitions. [2020-07-21 16:00:49,268 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 662 transitions. Word has length 341 [2020-07-21 16:00:49,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:49,269 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 662 transitions. [2020-07-21 16:00:49,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:00:49,269 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 662 transitions. [2020-07-21 16:00:49,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2020-07-21 16:00:49,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:49,273 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 17, 12, 11, 11, 11, 11, 11, 11, 11, 11, 10, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:49,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,487 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:49,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:49,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1749252806, now seen corresponding path program 7 times [2020-07-21 16:00:49,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:49,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328931022] [2020-07-21 16:00:49,489 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:49,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:49,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:49,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:49,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 87 proven. 477 refuted. 0 times theorem prover too weak. 1336 trivial. 0 not checked. [2020-07-21 16:00:49,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 87 proven. 498 refuted. 0 times theorem prover too weak. 1315 trivial. 0 not checked. [2020-07-21 16:00:52,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328931022] [2020-07-21 16:00:52,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:00:52,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300195550] [2020-07-21 16:00:52,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:00:52,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:00:52,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:00:52,829 INFO L87 Difference]: Start difference. First operand 368 states and 662 transitions. Second operand 20 states. [2020-07-21 16:00:53,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:53,180 INFO L93 Difference]: Finished difference Result 383 states and 685 transitions. [2020-07-21 16:00:53,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:00:53,181 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 262 [2020-07-21 16:00:53,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:53,185 INFO L225 Difference]: With dead ends: 383 [2020-07-21 16:00:53,185 INFO L226 Difference]: Without dead ends: 379 [2020-07-21 16:00:53,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 492 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:53,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-07-21 16:00:53,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 363. [2020-07-21 16:00:53,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 363 states. [2020-07-21 16:00:53,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 652 transitions. [2020-07-21 16:00:53,205 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 652 transitions. Word has length 262 [2020-07-21 16:00:53,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:53,205 INFO L479 AbstractCegarLoop]: Abstraction has 363 states and 652 transitions. [2020-07-21 16:00:53,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:00:53,205 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 652 transitions. [2020-07-21 16:00:53,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 16:00:53,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:53,211 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 24, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 12, 9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:53,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,420 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1730985800, now seen corresponding path program 23 times [2020-07-21 16:00:53,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860381411] [2020-07-21 16:00:53,422 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:53,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 721 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:54,077 INFO L134 CoverageAnalysis]: Checked inductivity of 6683 backedges. 3567 proven. 318 refuted. 0 times theorem prover too weak. 2798 trivial. 0 not checked. [2020-07-21 16:00:54,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:56,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,775 INFO L134 CoverageAnalysis]: Checked inductivity of 6683 backedges. 315 proven. 1232 refuted. 0 times theorem prover too weak. 5136 trivial. 0 not checked. [2020-07-21 16:00:57,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860381411] [2020-07-21 16:00:57,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:57,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:00:57,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383616668] [2020-07-21 16:00:57,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:57,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:57,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:57,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:57,777 INFO L87 Difference]: Start difference. First operand 363 states and 652 transitions. Second operand 23 states. [2020-07-21 16:00:58,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:58,757 INFO L93 Difference]: Finished difference Result 823 states and 1617 transitions. [2020-07-21 16:00:58,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:00:58,758 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 484 [2020-07-21 16:00:58,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:58,765 INFO L225 Difference]: With dead ends: 823 [2020-07-21 16:00:58,765 INFO L226 Difference]: Without dead ends: 465 [2020-07-21 16:00:58,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 929 SyntacticMatches, 17 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=295, Invalid=1345, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 16:00:58,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2020-07-21 16:00:58,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 401. [2020-07-21 16:00:58,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 401 states. [2020-07-21 16:00:58,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 760 transitions. [2020-07-21 16:00:58,787 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 760 transitions. Word has length 484 [2020-07-21 16:00:58,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:58,787 INFO L479 AbstractCegarLoop]: Abstraction has 401 states and 760 transitions. [2020-07-21 16:00:58,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:58,788 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 760 transitions. [2020-07-21 16:00:58,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 513 [2020-07-21 16:00:58,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:58,793 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 28, 27, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:59,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,004 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:59,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:59,005 INFO L82 PathProgramCache]: Analyzing trace with hash 30523512, now seen corresponding path program 24 times [2020-07-21 16:00:59,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:59,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [122339179] [2020-07-21 16:00:59,006 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:59,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:59,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:59,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:00:59,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:59,727 INFO L134 CoverageAnalysis]: Checked inductivity of 7533 backedges. 3966 proven. 618 refuted. 0 times theorem prover too weak. 2949 trivial. 0 not checked. [2020-07-21 16:00:59,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:02,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,136 INFO L134 CoverageAnalysis]: Checked inductivity of 7533 backedges. 498 proven. 1327 refuted. 0 times theorem prover too weak. 5708 trivial. 0 not checked. [2020-07-21 16:01:04,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [122339179] [2020-07-21 16:01:04,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:04,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 27 [2020-07-21 16:01:04,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720626740] [2020-07-21 16:01:04,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:04,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:04,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:04,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:04,139 INFO L87 Difference]: Start difference. First operand 401 states and 760 transitions. Second operand 27 states. [2020-07-21 16:01:05,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:05,711 INFO L93 Difference]: Finished difference Result 977 states and 2074 transitions. [2020-07-21 16:01:05,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:01:05,713 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 512 [2020-07-21 16:01:05,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:05,720 INFO L225 Difference]: With dead ends: 977 [2020-07-21 16:01:05,721 INFO L226 Difference]: Without dead ends: 582 [2020-07-21 16:01:05,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1046 GetRequests, 981 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=397, Invalid=2053, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:01:05,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2020-07-21 16:01:05,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 496. [2020-07-21 16:01:05,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-21 16:01:05,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 999 transitions. [2020-07-21 16:01:05,756 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 999 transitions. Word has length 512 [2020-07-21 16:01:05,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:05,756 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 999 transitions. [2020-07-21 16:01:05,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:05,757 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 999 transitions. [2020-07-21 16:01:05,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 714 [2020-07-21 16:01:05,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:05,763 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 52, 52, 33, 31, 27, 27, 27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 26, 26, 22, 21, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:05,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:05,964 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:05,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:05,965 INFO L82 PathProgramCache]: Analyzing trace with hash -884656612, now seen corresponding path program 25 times [2020-07-21 16:01:05,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:05,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635154618] [2020-07-21 16:01:05,966 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,455 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:06,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 14941 backedges. 892 proven. 2317 refuted. 0 times theorem prover too weak. 11732 trivial. 0 not checked. [2020-07-21 16:01:06,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:10,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:12,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,875 INFO L134 CoverageAnalysis]: Checked inductivity of 14941 backedges. 898 proven. 2343 refuted. 0 times theorem prover too weak. 11700 trivial. 0 not checked. [2020-07-21 16:01:13,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635154618] [2020-07-21 16:01:13,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:13,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 33 [2020-07-21 16:01:13,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178987959] [2020-07-21 16:01:13,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:01:13,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:13,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:01:13,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:13,877 INFO L87 Difference]: Start difference. First operand 496 states and 999 transitions. Second operand 33 states. [2020-07-21 16:01:16,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:16,438 INFO L93 Difference]: Finished difference Result 1274 states and 3086 transitions. [2020-07-21 16:01:16,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 16:01:16,439 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 713 [2020-07-21 16:01:16,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:16,447 INFO L225 Difference]: With dead ends: 1274 [2020-07-21 16:01:16,447 INFO L226 Difference]: Without dead ends: 731 [2020-07-21 16:01:16,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1457 GetRequests, 1371 SyntacticMatches, 23 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=618, Invalid=3542, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:01:16,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2020-07-21 16:01:16,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 592. [2020-07-21 16:01:16,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 592 states. [2020-07-21 16:01:16,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 1254 transitions. [2020-07-21 16:01:16,488 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 1254 transitions. Word has length 713 [2020-07-21 16:01:16,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:16,489 INFO L479 AbstractCegarLoop]: Abstraction has 592 states and 1254 transitions. [2020-07-21 16:01:16,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:01:16,489 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 1254 transitions. [2020-07-21 16:01:16,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2020-07-21 16:01:16,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:16,496 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 12, 12, 12, 12, 12, 12, 12, 8, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:16,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,697 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:16,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:16,698 INFO L82 PathProgramCache]: Analyzing trace with hash 2024575174, now seen corresponding path program 26 times [2020-07-21 16:01:16,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:16,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528288942] [2020-07-21 16:01:16,698 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:17,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:17,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:17,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:17,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 3880 backedges. 134 proven. 740 refuted. 0 times theorem prover too weak. 3006 trivial. 0 not checked. [2020-07-21 16:01:17,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:19,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3880 backedges. 134 proven. 764 refuted. 0 times theorem prover too weak. 2982 trivial. 0 not checked. [2020-07-21 16:01:20,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528288942] [2020-07-21 16:01:20,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:20,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:01:20,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690489537] [2020-07-21 16:01:20,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:01:20,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:20,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:01:20,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:20,925 INFO L87 Difference]: Start difference. First operand 592 states and 1254 transitions. Second operand 20 states. [2020-07-21 16:01:21,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:21,296 INFO L93 Difference]: Finished difference Result 596 states and 1257 transitions. [2020-07-21 16:01:21,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:01:21,297 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 370 [2020-07-21 16:01:21,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:21,305 INFO L225 Difference]: With dead ends: 596 [2020-07-21 16:01:21,305 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 16:01:21,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 707 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:21,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 16:01:21,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 581. [2020-07-21 16:01:21,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 581 states. [2020-07-21 16:01:21,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 581 states to 581 states and 1226 transitions. [2020-07-21 16:01:21,335 INFO L78 Accepts]: Start accepts. Automaton has 581 states and 1226 transitions. Word has length 370 [2020-07-21 16:01:21,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:21,336 INFO L479 AbstractCegarLoop]: Abstraction has 581 states and 1226 transitions. [2020-07-21 16:01:21,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:01:21,336 INFO L276 IsEmpty]: Start isEmpty. Operand 581 states and 1226 transitions. [2020-07-21 16:01:21,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-07-21 16:01:21,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:21,344 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 27, 27, 18, 16, 16, 16, 16, 16, 16, 16, 16, 16, 13, 13, 13, 13, 13, 13, 13, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:21,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:21,554 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:21,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:21,555 INFO L82 PathProgramCache]: Analyzing trace with hash 255335260, now seen corresponding path program 27 times [2020-07-21 16:01:21,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:21,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623535510] [2020-07-21 16:01:21,556 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:22,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:22,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:22,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 881 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:22,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:22,222 INFO L134 CoverageAnalysis]: Checked inductivity of 4453 backedges. 208 proven. 621 refuted. 0 times theorem prover too weak. 3624 trivial. 0 not checked. [2020-07-21 16:01:22,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:23,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:25,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4453 backedges. 208 proven. 637 refuted. 0 times theorem prover too weak. 3608 trivial. 0 not checked. [2020-07-21 16:01:25,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623535510] [2020-07-21 16:01:25,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:25,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:25,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936725145] [2020-07-21 16:01:25,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:25,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:25,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:25,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:25,184 INFO L87 Difference]: Start difference. First operand 581 states and 1226 transitions. Second operand 18 states. [2020-07-21 16:01:25,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:25,542 INFO L93 Difference]: Finished difference Result 671 states and 1544 transitions. [2020-07-21 16:01:25,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:25,543 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 395 [2020-07-21 16:01:25,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:25,554 INFO L225 Difference]: With dead ends: 671 [2020-07-21 16:01:25,554 INFO L226 Difference]: Without dead ends: 667 [2020-07-21 16:01:25,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 761 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:25,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2020-07-21 16:01:25,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 611. [2020-07-21 16:01:25,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 611 states. [2020-07-21 16:01:25,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 1367 transitions. [2020-07-21 16:01:25,598 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 1367 transitions. Word has length 395 [2020-07-21 16:01:25,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:25,599 INFO L479 AbstractCegarLoop]: Abstraction has 611 states and 1367 transitions. [2020-07-21 16:01:25,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:25,599 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 1367 transitions. [2020-07-21 16:01:25,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 16:01:25,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:25,605 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 31, 31, 24, 20, 20, 20, 20, 20, 20, 20, 20, 16, 15, 15, 15, 15, 15, 15, 15, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:25,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:25,806 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:25,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:25,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1716206056, now seen corresponding path program 8 times [2020-07-21 16:01:25,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:25,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980252731] [2020-07-21 16:01:25,808 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:26,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:26,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:26,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 1047 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:26,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:26,497 INFO L134 CoverageAnalysis]: Checked inductivity of 6470 backedges. 285 proven. 722 refuted. 0 times theorem prover too weak. 5463 trivial. 0 not checked. [2020-07-21 16:01:26,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:28,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:29,824 INFO L134 CoverageAnalysis]: Checked inductivity of 6470 backedges. 287 proven. 736 refuted. 0 times theorem prover too weak. 5447 trivial. 0 not checked. [2020-07-21 16:01:29,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980252731] [2020-07-21 16:01:29,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:29,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:01:29,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241948667] [2020-07-21 16:01:29,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:01:29,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:29,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:01:29,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:01:29,826 INFO L87 Difference]: Start difference. First operand 611 states and 1367 transitions. Second operand 18 states. [2020-07-21 16:01:30,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:30,126 INFO L93 Difference]: Finished difference Result 687 states and 1685 transitions. [2020-07-21 16:01:30,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:30,127 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 469 [2020-07-21 16:01:30,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:30,136 INFO L225 Difference]: With dead ends: 687 [2020-07-21 16:01:30,136 INFO L226 Difference]: Without dead ends: 683 [2020-07-21 16:01:30,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 945 GetRequests, 911 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:01:30,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2020-07-21 16:01:30,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 611. [2020-07-21 16:01:30,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 611 states. [2020-07-21 16:01:30,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 1367 transitions. [2020-07-21 16:01:30,173 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 1367 transitions. Word has length 469 [2020-07-21 16:01:30,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:30,173 INFO L479 AbstractCegarLoop]: Abstraction has 611 states and 1367 transitions. [2020-07-21 16:01:30,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:01:30,174 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 1367 transitions. [2020-07-21 16:01:30,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 520 [2020-07-21 16:01:30,178 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:30,178 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 26, 24, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 14, 13, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:30,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:30,381 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:30,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:30,382 INFO L82 PathProgramCache]: Analyzing trace with hash -739461553, now seen corresponding path program 28 times [2020-07-21 16:01:30,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:30,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754460150] [2020-07-21 16:01:30,383 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:30,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:30,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:30,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:30,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:31,155 INFO L134 CoverageAnalysis]: Checked inductivity of 7745 backedges. 4212 proven. 261 refuted. 0 times theorem prover too weak. 3272 trivial. 0 not checked. [2020-07-21 16:01:31,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:33,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,949 INFO L134 CoverageAnalysis]: Checked inductivity of 7745 backedges. 408 proven. 1087 refuted. 0 times theorem prover too weak. 6250 trivial. 0 not checked. [2020-07-21 16:01:34,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754460150] [2020-07-21 16:01:34,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:34,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:34,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366228749] [2020-07-21 16:01:34,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:34,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:34,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:34,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:34,951 INFO L87 Difference]: Start difference. First operand 611 states and 1367 transitions. Second operand 21 states. [2020-07-21 16:01:35,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:35,942 INFO L93 Difference]: Finished difference Result 1384 states and 3153 transitions. [2020-07-21 16:01:35,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:35,943 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 519 [2020-07-21 16:01:35,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:35,953 INFO L225 Difference]: With dead ends: 1384 [2020-07-21 16:01:35,953 INFO L226 Difference]: Without dead ends: 759 [2020-07-21 16:01:35,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 1003 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:35,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 759 states. [2020-07-21 16:01:35,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 759 to 654. [2020-07-21 16:01:35,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 654 states. [2020-07-21 16:01:36,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 654 states to 654 states and 1479 transitions. [2020-07-21 16:01:36,004 INFO L78 Accepts]: Start accepts. Automaton has 654 states and 1479 transitions. Word has length 519 [2020-07-21 16:01:36,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:36,007 INFO L479 AbstractCegarLoop]: Abstraction has 654 states and 1479 transitions. [2020-07-21 16:01:36,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:36,007 INFO L276 IsEmpty]: Start isEmpty. Operand 654 states and 1479 transitions. [2020-07-21 16:01:36,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 724 [2020-07-21 16:01:36,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:36,013 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 51, 51, 31, 31, 29, 29, 29, 29, 29, 29, 29, 27, 25, 25, 25, 25, 25, 25, 25, 20, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:36,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,219 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:36,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:36,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1104687945, now seen corresponding path program 29 times [2020-07-21 16:01:36,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:36,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315633847] [2020-07-21 16:01:36,221 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:36,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:36,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 1064 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:01:36,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:37,264 INFO L134 CoverageAnalysis]: Checked inductivity of 15466 backedges. 1023 proven. 2707 refuted. 0 times theorem prover too weak. 11736 trivial. 0 not checked. [2020-07-21 16:01:37,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:41,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:42,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:42,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:42,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,454 INFO L134 CoverageAnalysis]: Checked inductivity of 15466 backedges. 1023 proven. 2752 refuted. 0 times theorem prover too weak. 11691 trivial. 0 not checked. [2020-07-21 16:01:47,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315633847] [2020-07-21 16:01:47,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:47,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 31] total 37 [2020-07-21 16:01:47,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181536723] [2020-07-21 16:01:47,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 16:01:47,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:47,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 16:01:47,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1191, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:47,456 INFO L87 Difference]: Start difference. First operand 654 states and 1479 transitions. Second operand 37 states. [2020-07-21 16:01:49,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:49,725 INFO L93 Difference]: Finished difference Result 1427 states and 3658 transitions. [2020-07-21 16:01:49,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:01:49,727 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 723 [2020-07-21 16:01:49,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:49,745 INFO L225 Difference]: With dead ends: 1427 [2020-07-21 16:01:49,746 INFO L226 Difference]: Without dead ends: 775 [2020-07-21 16:01:49,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1471 GetRequests, 1383 SyntacticMatches, 27 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 854 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=3337, Unknown=0, NotChecked=0, Total=3906 [2020-07-21 16:01:49,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 775 states. [2020-07-21 16:01:49,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 686. [2020-07-21 16:01:49,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 686 states. [2020-07-21 16:01:49,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 686 states to 686 states and 1665 transitions. [2020-07-21 16:01:49,822 INFO L78 Accepts]: Start accepts. Automaton has 686 states and 1665 transitions. Word has length 723 [2020-07-21 16:01:49,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:49,823 INFO L479 AbstractCegarLoop]: Abstraction has 686 states and 1665 transitions. [2020-07-21 16:01:49,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 16:01:49,823 INFO L276 IsEmpty]: Start isEmpty. Operand 686 states and 1665 transitions. [2020-07-21 16:01:49,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 16:01:49,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:49,835 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 15, 14, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:50,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:50,052 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:50,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:50,053 INFO L82 PathProgramCache]: Analyzing trace with hash -153498249, now seen corresponding path program 30 times [2020-07-21 16:01:50,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:50,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531105007] [2020-07-21 16:01:50,053 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:50,625 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:50,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:50,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:50,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:50,889 INFO L134 CoverageAnalysis]: Checked inductivity of 3028 backedges. 528 proven. 563 refuted. 0 times theorem prover too weak. 1937 trivial. 0 not checked. [2020-07-21 16:01:50,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:52,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:52,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:55,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:55,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3028 backedges. 530 proven. 579 refuted. 0 times theorem prover too weak. 1919 trivial. 0 not checked. [2020-07-21 16:01:55,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531105007] [2020-07-21 16:01:55,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:55,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:01:55,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614769753] [2020-07-21 16:01:55,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:55,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:55,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:55,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:55,115 INFO L87 Difference]: Start difference. First operand 686 states and 1665 transitions. Second operand 27 states. [2020-07-21 16:01:56,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:56,527 INFO L93 Difference]: Finished difference Result 1417 states and 3477 transitions. [2020-07-21 16:01:56,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:01:56,528 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 330 [2020-07-21 16:01:56,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:56,539 INFO L225 Difference]: With dead ends: 1417 [2020-07-21 16:01:56,539 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 16:01:56,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 613 SyntacticMatches, 21 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=305, Invalid=1587, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:01:56,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 16:01:56,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 658. [2020-07-21 16:01:56,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 658 states. [2020-07-21 16:01:56,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 658 states to 658 states and 1456 transitions. [2020-07-21 16:01:56,580 INFO L78 Accepts]: Start accepts. Automaton has 658 states and 1456 transitions. Word has length 330 [2020-07-21 16:01:56,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:56,580 INFO L479 AbstractCegarLoop]: Abstraction has 658 states and 1456 transitions. [2020-07-21 16:01:56,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:56,580 INFO L276 IsEmpty]: Start isEmpty. Operand 658 states and 1456 transitions. [2020-07-21 16:01:56,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-21 16:01:56,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:56,584 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 17, 16, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 10, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:56,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:56,785 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:56,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:56,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1035765592, now seen corresponding path program 31 times [2020-07-21 16:01:56,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:56,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117587387] [2020-07-21 16:01:56,787 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:57,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:57,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:57,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:57,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:57,546 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 164 proven. 546 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-21 16:01:57,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:59,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:59,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:00,599 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 164 proven. 562 refuted. 0 times theorem prover too weak. 2606 trivial. 0 not checked. [2020-07-21 16:02:00,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117587387] [2020-07-21 16:02:00,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:00,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:00,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537195939] [2020-07-21 16:02:00,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:00,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:00,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:00,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:00,601 INFO L87 Difference]: Start difference. First operand 658 states and 1456 transitions. Second operand 18 states. [2020-07-21 16:02:00,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:00,991 INFO L93 Difference]: Finished difference Result 703 states and 1608 transitions. [2020-07-21 16:02:00,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:00,993 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 346 [2020-07-21 16:02:00,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:01,003 INFO L225 Difference]: With dead ends: 703 [2020-07-21 16:02:01,003 INFO L226 Difference]: Without dead ends: 699 [2020-07-21 16:02:01,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 663 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:01,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2020-07-21 16:02:01,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 646. [2020-07-21 16:02:01,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 646 states. [2020-07-21 16:02:01,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 646 states to 646 states and 1407 transitions. [2020-07-21 16:02:01,043 INFO L78 Accepts]: Start accepts. Automaton has 646 states and 1407 transitions. Word has length 346 [2020-07-21 16:02:01,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:01,043 INFO L479 AbstractCegarLoop]: Abstraction has 646 states and 1407 transitions. [2020-07-21 16:02:01,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:01,043 INFO L276 IsEmpty]: Start isEmpty. Operand 646 states and 1407 transitions. [2020-07-21 16:02:01,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:02:01,047 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:01,047 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:01,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,248 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:01,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:01,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1331392845, now seen corresponding path program 32 times [2020-07-21 16:02:01,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:01,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653122150] [2020-07-21 16:02:01,250 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:01,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:01,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:01,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 237 proven. 383 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 16:02:02,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:03,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 237 proven. 393 refuted. 0 times theorem prover too weak. 2954 trivial. 0 not checked. [2020-07-21 16:02:04,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653122150] [2020-07-21 16:02:04,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:04,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:04,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748190951] [2020-07-21 16:02:04,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:04,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:04,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:04,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:04,729 INFO L87 Difference]: Start difference. First operand 646 states and 1407 transitions. Second operand 16 states. [2020-07-21 16:02:05,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:05,058 INFO L93 Difference]: Finished difference Result 739 states and 1757 transitions. [2020-07-21 16:02:05,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:05,060 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 358 [2020-07-21 16:02:05,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:05,073 INFO L225 Difference]: With dead ends: 739 [2020-07-21 16:02:05,074 INFO L226 Difference]: Without dead ends: 735 [2020-07-21 16:02:05,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 720 GetRequests, 691 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:05,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735 states. [2020-07-21 16:02:05,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735 to 646. [2020-07-21 16:02:05,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 646 states. [2020-07-21 16:02:05,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 646 states to 646 states and 1407 transitions. [2020-07-21 16:02:05,128 INFO L78 Accepts]: Start accepts. Automaton has 646 states and 1407 transitions. Word has length 358 [2020-07-21 16:02:05,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:05,128 INFO L479 AbstractCegarLoop]: Abstraction has 646 states and 1407 transitions. [2020-07-21 16:02:05,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:05,128 INFO L276 IsEmpty]: Start isEmpty. Operand 646 states and 1407 transitions. [2020-07-21 16:02:05,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2020-07-21 16:02:05,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:05,132 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 17, 16, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 10, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:05,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,333 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:05,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:05,334 INFO L82 PathProgramCache]: Analyzing trace with hash 684370545, now seen corresponding path program 33 times [2020-07-21 16:02:05,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:05,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832079145] [2020-07-21 16:02:05,335 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:05,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:05,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:05,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:05,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:06,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 371 proven. 365 refuted. 0 times theorem prover too weak. 2848 trivial. 0 not checked. [2020-07-21 16:02:06,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:07,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 373 proven. 379 refuted. 0 times theorem prover too weak. 2832 trivial. 0 not checked. [2020-07-21 16:02:09,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832079145] [2020-07-21 16:02:09,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:09,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:09,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737040204] [2020-07-21 16:02:09,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:09,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:09,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:09,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:09,331 INFO L87 Difference]: Start difference. First operand 646 states and 1407 transitions. Second operand 18 states. [2020-07-21 16:02:09,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:09,721 INFO L93 Difference]: Finished difference Result 659 states and 1429 transitions. [2020-07-21 16:02:09,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:09,723 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 358 [2020-07-21 16:02:09,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:09,732 INFO L225 Difference]: With dead ends: 659 [2020-07-21 16:02:09,733 INFO L226 Difference]: Without dead ends: 655 [2020-07-21 16:02:09,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 687 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:09,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2020-07-21 16:02:09,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 641. [2020-07-21 16:02:09,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 641 states. [2020-07-21 16:02:09,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 641 states to 641 states and 1392 transitions. [2020-07-21 16:02:09,766 INFO L78 Accepts]: Start accepts. Automaton has 641 states and 1392 transitions. Word has length 358 [2020-07-21 16:02:09,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:09,767 INFO L479 AbstractCegarLoop]: Abstraction has 641 states and 1392 transitions. [2020-07-21 16:02:09,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:09,767 INFO L276 IsEmpty]: Start isEmpty. Operand 641 states and 1392 transitions. [2020-07-21 16:02:09,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2020-07-21 16:02:09,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:09,770 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 17, 16, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 12, 12, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:09,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:09,971 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:09,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:09,972 INFO L82 PathProgramCache]: Analyzing trace with hash 2017059741, now seen corresponding path program 34 times [2020-07-21 16:02:09,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:09,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523956287] [2020-07-21 16:02:09,973 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:10,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:10,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:10,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 369 proven. 297 refuted. 0 times theorem prover too weak. 3454 trivial. 0 not checked. [2020-07-21 16:02:10,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:12,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,547 INFO L134 CoverageAnalysis]: Checked inductivity of 4120 backedges. 371 proven. 305 refuted. 0 times theorem prover too weak. 3444 trivial. 0 not checked. [2020-07-21 16:02:13,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523956287] [2020-07-21 16:02:13,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:13,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:13,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200950761] [2020-07-21 16:02:13,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:13,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:13,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:13,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:13,548 INFO L87 Difference]: Start difference. First operand 641 states and 1392 transitions. Second operand 16 states. [2020-07-21 16:02:13,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:13,852 INFO L93 Difference]: Finished difference Result 700 states and 1564 transitions. [2020-07-21 16:02:13,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:13,854 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 382 [2020-07-21 16:02:13,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:13,863 INFO L225 Difference]: With dead ends: 700 [2020-07-21 16:02:13,863 INFO L226 Difference]: Without dead ends: 696 [2020-07-21 16:02:13,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 739 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:13,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2020-07-21 16:02:13,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 644. [2020-07-21 16:02:13,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 644 states. [2020-07-21 16:02:13,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 1400 transitions. [2020-07-21 16:02:13,909 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 1400 transitions. Word has length 382 [2020-07-21 16:02:13,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:13,909 INFO L479 AbstractCegarLoop]: Abstraction has 644 states and 1400 transitions. [2020-07-21 16:02:13,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:13,909 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 1400 transitions. [2020-07-21 16:02:13,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 16:02:13,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:13,913 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 29, 29, 17, 16, 16, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:14,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,114 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:14,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:14,115 INFO L82 PathProgramCache]: Analyzing trace with hash -252032451, now seen corresponding path program 35 times [2020-07-21 16:02:14,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:14,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463877951] [2020-07-21 16:02:14,116 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:14,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:14,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 906 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:02:14,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:14,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4708 backedges. 347 proven. 357 refuted. 0 times theorem prover too weak. 4004 trivial. 0 not checked. [2020-07-21 16:02:14,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:16,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:16,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:16,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4708 backedges. 347 proven. 369 refuted. 0 times theorem prover too weak. 3992 trivial. 0 not checked. [2020-07-21 16:02:18,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463877951] [2020-07-21 16:02:18,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:18,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:02:18,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514140815] [2020-07-21 16:02:18,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:02:18,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:18,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:02:18,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:02:18,010 INFO L87 Difference]: Start difference. First operand 644 states and 1400 transitions. Second operand 16 states. [2020-07-21 16:02:18,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:18,321 INFO L93 Difference]: Finished difference Result 718 states and 1651 transitions. [2020-07-21 16:02:18,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:02:18,322 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 406 [2020-07-21 16:02:18,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:18,331 INFO L225 Difference]: With dead ends: 718 [2020-07-21 16:02:18,331 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 16:02:18,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 788 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:02:18,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 16:02:18,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 644. [2020-07-21 16:02:18,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 644 states. [2020-07-21 16:02:18,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 1400 transitions. [2020-07-21 16:02:18,411 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 1400 transitions. Word has length 406 [2020-07-21 16:02:18,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:18,412 INFO L479 AbstractCegarLoop]: Abstraction has 644 states and 1400 transitions. [2020-07-21 16:02:18,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:02:18,412 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 1400 transitions. [2020-07-21 16:02:18,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 422 [2020-07-21 16:02:18,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:18,417 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 20, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:18,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:18,626 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:18,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:18,627 INFO L82 PathProgramCache]: Analyzing trace with hash -574674536, now seen corresponding path program 36 times [2020-07-21 16:02:18,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:18,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027664664] [2020-07-21 16:02:18,627 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:19,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:19,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:02:19,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5054 backedges. 2665 proven. 488 refuted. 0 times theorem prover too weak. 1901 trivial. 0 not checked. [2020-07-21 16:02:19,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:22,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:25,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5054 backedges. 412 proven. 1031 refuted. 0 times theorem prover too weak. 3611 trivial. 0 not checked. [2020-07-21 16:02:25,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027664664] [2020-07-21 16:02:25,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:25,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:02:25,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143312682] [2020-07-21 16:02:25,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:25,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:25,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:25,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:25,143 INFO L87 Difference]: Start difference. First operand 644 states and 1400 transitions. Second operand 25 states. [2020-07-21 16:02:26,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:26,581 INFO L93 Difference]: Finished difference Result 1241 states and 2900 transitions. [2020-07-21 16:02:26,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:02:26,582 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 421 [2020-07-21 16:02:26,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:26,589 INFO L225 Difference]: With dead ends: 1241 [2020-07-21 16:02:26,589 INFO L226 Difference]: Without dead ends: 602 [2020-07-21 16:02:26,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 860 GetRequests, 799 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=328, Invalid=1564, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:02:26,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-07-21 16:02:26,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 526. [2020-07-21 16:02:26,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 526 states. [2020-07-21 16:02:26,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 1082 transitions. [2020-07-21 16:02:26,627 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 1082 transitions. Word has length 421 [2020-07-21 16:02:26,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:26,628 INFO L479 AbstractCegarLoop]: Abstraction has 526 states and 1082 transitions. [2020-07-21 16:02:26,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:26,628 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 1082 transitions. [2020-07-21 16:02:26,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 16:02:26,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:26,633 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:26,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:26,844 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:26,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:26,845 INFO L82 PathProgramCache]: Analyzing trace with hash -562964090, now seen corresponding path program 37 times [2020-07-21 16:02:26,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:26,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964709099] [2020-07-21 16:02:26,846 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:27,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:27,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:27,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:27,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:27,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4404 backedges. 627 proven. 195 refuted. 0 times theorem prover too weak. 3582 trivial. 0 not checked. [2020-07-21 16:02:27,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:29,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:29,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:30,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:31,565 INFO L134 CoverageAnalysis]: Checked inductivity of 4404 backedges. 631 proven. 207 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2020-07-21 16:02:31,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964709099] [2020-07-21 16:02:31,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:31,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:02:31,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3387812] [2020-07-21 16:02:31,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:02:31,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:31,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:02:31,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:02:31,567 INFO L87 Difference]: Start difference. First operand 526 states and 1082 transitions. Second operand 18 states. [2020-07-21 16:02:31,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:31,976 INFO L93 Difference]: Finished difference Result 543 states and 1115 transitions. [2020-07-21 16:02:31,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:31,977 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 394 [2020-07-21 16:02:31,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:31,983 INFO L225 Difference]: With dead ends: 543 [2020-07-21 16:02:31,983 INFO L226 Difference]: Without dead ends: 539 [2020-07-21 16:02:31,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 759 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:02:31,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2020-07-21 16:02:32,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 526. [2020-07-21 16:02:32,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 526 states. [2020-07-21 16:02:32,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 1082 transitions. [2020-07-21 16:02:32,009 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 1082 transitions. Word has length 394 [2020-07-21 16:02:32,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:32,010 INFO L479 AbstractCegarLoop]: Abstraction has 526 states and 1082 transitions. [2020-07-21 16:02:32,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:02:32,010 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 1082 transitions. [2020-07-21 16:02:32,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 431 [2020-07-21 16:02:32,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:32,014 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 18, 17, 17, 17, 17, 17, 17, 17, 17, 16, 15, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:32,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:32,229 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:32,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:32,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1430194917, now seen corresponding path program 9 times [2020-07-21 16:02:32,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:32,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501635121] [2020-07-21 16:02:32,231 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:32,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:32,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:32,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:32,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:33,150 INFO L134 CoverageAnalysis]: Checked inductivity of 5324 backedges. 175 proven. 1003 refuted. 0 times theorem prover too weak. 4146 trivial. 0 not checked. [2020-07-21 16:02:33,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:36,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:37,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:37,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:39,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5324 backedges. 175 proven. 1033 refuted. 0 times theorem prover too weak. 4116 trivial. 0 not checked. [2020-07-21 16:02:39,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501635121] [2020-07-21 16:02:39,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:39,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:02:39,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77576576] [2020-07-21 16:02:39,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:02:39,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:39,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:02:39,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:02:39,529 INFO L87 Difference]: Start difference. First operand 526 states and 1082 transitions. Second operand 22 states. [2020-07-21 16:02:40,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:40,195 INFO L93 Difference]: Finished difference Result 542 states and 1124 transitions. [2020-07-21 16:02:40,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:02:40,197 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 430 [2020-07-21 16:02:40,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:40,203 INFO L225 Difference]: With dead ends: 542 [2020-07-21 16:02:40,203 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 16:02:40,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 824 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:02:40,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 16:02:40,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 511. [2020-07-21 16:02:40,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 511 states. [2020-07-21 16:02:40,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 1031 transitions. [2020-07-21 16:02:40,229 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 1031 transitions. Word has length 430 [2020-07-21 16:02:40,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:40,229 INFO L479 AbstractCegarLoop]: Abstraction has 511 states and 1031 transitions. [2020-07-21 16:02:40,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:02:40,230 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 1031 transitions. [2020-07-21 16:02:40,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-21 16:02:40,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:40,233 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 21, 20, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 16, 12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:40,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:40,434 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:40,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:40,435 INFO L82 PathProgramCache]: Analyzing trace with hash -806900829, now seen corresponding path program 38 times [2020-07-21 16:02:40,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:40,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206773125] [2020-07-21 16:02:40,436 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:41,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:41,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:41,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:02:41,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:41,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 3185 proven. 644 refuted. 0 times theorem prover too weak. 2295 trivial. 0 not checked. [2020-07-21 16:02:41,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:45,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:45,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:46,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:46,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:48,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 6124 backedges. 598 proven. 1300 refuted. 0 times theorem prover too weak. 4226 trivial. 0 not checked. [2020-07-21 16:02:49,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206773125] [2020-07-21 16:02:49,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:49,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:02:49,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75285466] [2020-07-21 16:02:49,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:49,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:49,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:49,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:49,649 INFO L87 Difference]: Start difference. First operand 511 states and 1031 transitions. Second operand 29 states. [2020-07-21 16:02:51,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:51,698 INFO L93 Difference]: Finished difference Result 1035 states and 2114 transitions. [2020-07-21 16:02:51,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:02:51,700 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 462 [2020-07-21 16:02:51,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:51,707 INFO L225 Difference]: With dead ends: 1035 [2020-07-21 16:02:51,707 INFO L226 Difference]: Without dead ends: 530 [2020-07-21 16:02:51,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 873 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:02:51,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2020-07-21 16:02:51,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 505. [2020-07-21 16:02:51,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 505 states. [2020-07-21 16:02:51,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 982 transitions. [2020-07-21 16:02:51,740 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 982 transitions. Word has length 462 [2020-07-21 16:02:51,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:51,741 INFO L479 AbstractCegarLoop]: Abstraction has 505 states and 982 transitions. [2020-07-21 16:02:51,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:51,741 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 982 transitions. [2020-07-21 16:02:51,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 16:02:51,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:51,744 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 23, 23, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 14, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:51,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:51,945 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:51,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:51,946 INFO L82 PathProgramCache]: Analyzing trace with hash -273257542, now seen corresponding path program 39 times [2020-07-21 16:02:51,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:51,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492042096] [2020-07-21 16:02:51,947 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:52,652 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:52,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:52,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 712 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:02:52,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:53,062 INFO L134 CoverageAnalysis]: Checked inductivity of 6570 backedges. 934 proven. 1215 refuted. 0 times theorem prover too weak. 4421 trivial. 0 not checked. [2020-07-21 16:02:53,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:56,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:57,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:00,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:01,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:02,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:03,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6570 backedges. 934 proven. 1253 refuted. 0 times theorem prover too weak. 4383 trivial. 0 not checked. [2020-07-21 16:03:03,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492042096] [2020-07-21 16:03:03,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:03,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:03:03,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951621623] [2020-07-21 16:03:03,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:03:03,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:03,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:03:03,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:03:03,190 INFO L87 Difference]: Start difference. First operand 505 states and 982 transitions. Second operand 33 states. [2020-07-21 16:03:06,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:06,089 INFO L93 Difference]: Finished difference Result 1067 states and 2156 transitions. [2020-07-21 16:03:06,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 16:03:06,091 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 479 [2020-07-21 16:03:06,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:06,100 INFO L225 Difference]: With dead ends: 1067 [2020-07-21 16:03:06,100 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 16:03:06,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 982 GetRequests, 899 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:03:06,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 16:03:06,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 527. [2020-07-21 16:03:06,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 527 states. [2020-07-21 16:03:06,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 527 states to 527 states and 1009 transitions. [2020-07-21 16:03:06,129 INFO L78 Accepts]: Start accepts. Automaton has 527 states and 1009 transitions. Word has length 479 [2020-07-21 16:03:06,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:06,130 INFO L479 AbstractCegarLoop]: Abstraction has 527 states and 1009 transitions. [2020-07-21 16:03:06,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:03:06,130 INFO L276 IsEmpty]: Start isEmpty. Operand 527 states and 1009 transitions. [2020-07-21 16:03:06,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 701 [2020-07-21 16:03:06,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:06,135 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 50, 50, 38, 37, 26, 26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 25, 16, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:06,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:06,336 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:06,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:06,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1334499288, now seen corresponding path program 40 times [2020-07-21 16:03:06,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:06,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418083477] [2020-07-21 16:03:06,338 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:07,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:07,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:07,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:03:07,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:07,724 INFO L134 CoverageAnalysis]: Checked inductivity of 14281 backedges. 7733 proven. 1015 refuted. 0 times theorem prover too weak. 5533 trivial. 0 not checked. [2020-07-21 16:03:07,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:14,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:14,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:15,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:16,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:17,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:18,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:18,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:18,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:19,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:19,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:19,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:19,416 INFO L134 CoverageAnalysis]: Checked inductivity of 14281 backedges. 738 proven. 2585 refuted. 0 times theorem prover too weak. 10958 trivial. 0 not checked. [2020-07-21 16:03:19,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418083477] [2020-07-21 16:03:19,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:19,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:03:19,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669221752] [2020-07-21 16:03:19,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:03:19,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:19,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:03:19,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:03:19,419 INFO L87 Difference]: Start difference. First operand 527 states and 1009 transitions. Second operand 31 states. [2020-07-21 16:03:23,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:23,012 INFO L93 Difference]: Finished difference Result 1194 states and 2383 transitions. [2020-07-21 16:03:23,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:03:23,013 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 700 [2020-07-21 16:03:23,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:23,021 INFO L225 Difference]: With dead ends: 1194 [2020-07-21 16:03:23,022 INFO L226 Difference]: Without dead ends: 671 [2020-07-21 16:03:23,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1428 GetRequests, 1345 SyntacticMatches, 25 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=554, Invalid=2986, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 16:03:23,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2020-07-21 16:03:23,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 557. [2020-07-21 16:03:23,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 557 states. [2020-07-21 16:03:23,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 1078 transitions. [2020-07-21 16:03:23,064 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 1078 transitions. Word has length 700 [2020-07-21 16:03:23,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:23,065 INFO L479 AbstractCegarLoop]: Abstraction has 557 states and 1078 transitions. [2020-07-21 16:03:23,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:03:23,065 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 1078 transitions. [2020-07-21 16:03:23,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:03:23,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:23,071 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 39, 39, 27, 27, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 17, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:23,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:23,286 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:23,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:23,286 INFO L82 PathProgramCache]: Analyzing trace with hash -598646496, now seen corresponding path program 41 times [2020-07-21 16:03:23,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:23,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676156168] [2020-07-21 16:03:23,287 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 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:24,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:24,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:24,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:03:24,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:24,528 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 229 proven. 1386 refuted. 0 times theorem prover too weak. 7443 trivial. 0 not checked. [2020-07-21 16:03:24,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:29,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:29,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:31,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:32,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:33,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9058 backedges. 229 proven. 1419 refuted. 0 times theorem prover too weak. 7410 trivial. 0 not checked. [2020-07-21 16:03:33,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676156168] [2020-07-21 16:03:33,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:33,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:03:33,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210701823] [2020-07-21 16:03:33,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:03:33,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:33,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:03:33,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:03:33,720 INFO L87 Difference]: Start difference. First operand 557 states and 1078 transitions. Second operand 22 states. [2020-07-21 16:03:34,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:34,273 INFO L93 Difference]: Finished difference Result 569 states and 1103 transitions. [2020-07-21 16:03:34,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:03:34,275 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 559 [2020-07-21 16:03:34,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:34,281 INFO L225 Difference]: With dead ends: 569 [2020-07-21 16:03:34,282 INFO L226 Difference]: Without dead ends: 565 [2020-07-21 16:03:34,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 1081 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:03:34,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2020-07-21 16:03:34,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 562. [2020-07-21 16:03:34,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 562 states. [2020-07-21 16:03:34,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 562 states to 562 states and 1092 transitions. [2020-07-21 16:03:34,329 INFO L78 Accepts]: Start accepts. Automaton has 562 states and 1092 transitions. Word has length 559 [2020-07-21 16:03:34,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:34,330 INFO L479 AbstractCegarLoop]: Abstraction has 562 states and 1092 transitions. [2020-07-21 16:03:34,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:03:34,331 INFO L276 IsEmpty]: Start isEmpty. Operand 562 states and 1092 transitions. [2020-07-21 16:03:34,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 561 [2020-07-21 16:03:34,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:34,338 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 39, 39, 28, 27, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 17, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:34,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:34,553 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:34,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:34,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1633030570, now seen corresponding path program 42 times [2020-07-21 16:03:34,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:34,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271941692] [2020-07-21 16:03:34,554 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 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:35,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:03:35,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:35,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 830 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:03:35,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:35,984 INFO L134 CoverageAnalysis]: Checked inductivity of 9085 backedges. 4837 proven. 646 refuted. 0 times theorem prover too weak. 3602 trivial. 0 not checked. [2020-07-21 16:03:35,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:41,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:41,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:42,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:44,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:45,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:45,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:45,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:45,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:45,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 9085 backedges. 717 proven. 1476 refuted. 0 times theorem prover too weak. 6892 trivial. 0 not checked. [2020-07-21 16:03:46,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271941692] [2020-07-21 16:03:46,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:46,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:03:46,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421199525] [2020-07-21 16:03:46,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:03:46,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:46,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:03:46,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:46,116 INFO L87 Difference]: Start difference. First operand 562 states and 1092 transitions. Second operand 27 states. [2020-07-21 16:03:48,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:48,697 INFO L93 Difference]: Finished difference Result 1342 states and 2832 transitions. [2020-07-21 16:03:48,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 16:03:48,700 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 560 [2020-07-21 16:03:48,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:48,710 INFO L225 Difference]: With dead ends: 1342 [2020-07-21 16:03:48,710 INFO L226 Difference]: Without dead ends: 767 [2020-07-21 16:03:48,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1142 GetRequests, 1073 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:03:48,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2020-07-21 16:03:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 670. [2020-07-21 16:03:48,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 670 states. [2020-07-21 16:03:48,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 670 states to 670 states and 1348 transitions. [2020-07-21 16:03:48,752 INFO L78 Accepts]: Start accepts. Automaton has 670 states and 1348 transitions. Word has length 560 [2020-07-21 16:03:48,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:48,753 INFO L479 AbstractCegarLoop]: Abstraction has 670 states and 1348 transitions. [2020-07-21 16:03:48,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:03:48,753 INFO L276 IsEmpty]: Start isEmpty. Operand 670 states and 1348 transitions. [2020-07-21 16:03:48,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-21 16:03:48,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:48,758 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 40, 40, 27, 27, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 16, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:48,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:48,959 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:48,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:48,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1953130674, now seen corresponding path program 43 times [2020-07-21 16:03:48,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:48,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223796710] [2020-07-21 16:03:48,961 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:49,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:03:49,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:03:49,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:03:49,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:03:50,165 INFO L134 CoverageAnalysis]: Checked inductivity of 9034 backedges. 303 proven. 1118 refuted. 0 times theorem prover too weak. 7613 trivial. 0 not checked. [2020-07-21 16:03:50,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:03:54,308 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:03:54,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:56,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:56,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:57,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:03:58,742 INFO L134 CoverageAnalysis]: Checked inductivity of 9034 backedges. 303 proven. 1142 refuted. 0 times theorem prover too weak. 7589 trivial. 0 not checked. [2020-07-21 16:03:58,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223796710] [2020-07-21 16:03:58,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:03:58,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:03:58,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580825611] [2020-07-21 16:03:58,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:03:58,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:03:58,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:03:58,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:03:58,744 INFO L87 Difference]: Start difference. First operand 670 states and 1348 transitions. Second operand 20 states. [2020-07-21 16:03:59,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:03:59,446 INFO L93 Difference]: Finished difference Result 775 states and 1678 transitions. [2020-07-21 16:03:59,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:03:59,449 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 559 [2020-07-21 16:03:59,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:03:59,458 INFO L225 Difference]: With dead ends: 775 [2020-07-21 16:03:59,458 INFO L226 Difference]: Without dead ends: 771 [2020-07-21 16:03:59,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1124 GetRequests, 1085 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:03:59,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2020-07-21 16:03:59,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 715. [2020-07-21 16:03:59,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 715 states. [2020-07-21 16:03:59,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 715 states to 715 states and 1498 transitions. [2020-07-21 16:03:59,503 INFO L78 Accepts]: Start accepts. Automaton has 715 states and 1498 transitions. Word has length 559 [2020-07-21 16:03:59,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:03:59,503 INFO L479 AbstractCegarLoop]: Abstraction has 715 states and 1498 transitions. [2020-07-21 16:03:59,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:03:59,504 INFO L276 IsEmpty]: Start isEmpty. Operand 715 states and 1498 transitions. [2020-07-21 16:03:59,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 598 [2020-07-21 16:03:59,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:03:59,511 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 39, 39, 29, 27, 25, 25, 25, 25, 25, 25, 25, 23, 19, 19, 19, 19, 19, 19, 19, 10, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:03:59,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:03:59,725 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:03:59,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:03:59,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1704690547, now seen corresponding path program 44 times [2020-07-21 16:03:59,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:03:59,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447527993] [2020-07-21 16:03:59,727 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:00,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:00,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:00,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 884 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:04:00,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:01,062 INFO L134 CoverageAnalysis]: Checked inductivity of 10505 backedges. 5636 proven. 166 refuted. 0 times theorem prover too weak. 4703 trivial. 0 not checked. [2020-07-21 16:04:01,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:06,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:07,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:08,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:09,194 INFO L134 CoverageAnalysis]: Checked inductivity of 10505 backedges. 649 proven. 1224 refuted. 0 times theorem prover too weak. 8632 trivial. 0 not checked. [2020-07-21 16:04:09,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447527993] [2020-07-21 16:04:09,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:09,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:04:09,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272042297] [2020-07-21 16:04:09,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:04:09,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:09,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:04:09,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:04:09,196 INFO L87 Difference]: Start difference. First operand 715 states and 1498 transitions. Second operand 21 states. [2020-07-21 16:04:11,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:11,067 INFO L93 Difference]: Finished difference Result 1599 states and 3514 transitions. [2020-07-21 16:04:11,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:04:11,070 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 597 [2020-07-21 16:04:11,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:11,081 INFO L225 Difference]: With dead ends: 1599 [2020-07-21 16:04:11,081 INFO L226 Difference]: Without dead ends: 879 [2020-07-21 16:04:11,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1159 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:04:11,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2020-07-21 16:04:11,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 667. [2020-07-21 16:04:11,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 667 states. [2020-07-21 16:04:11,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 667 states to 667 states and 1418 transitions. [2020-07-21 16:04:11,131 INFO L78 Accepts]: Start accepts. Automaton has 667 states and 1418 transitions. Word has length 597 [2020-07-21 16:04:11,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:11,131 INFO L479 AbstractCegarLoop]: Abstraction has 667 states and 1418 transitions. [2020-07-21 16:04:11,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:04:11,131 INFO L276 IsEmpty]: Start isEmpty. Operand 667 states and 1418 transitions. [2020-07-21 16:04:11,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-21 16:04:11,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:11,137 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 44, 44, 28, 27, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 19, 17, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:11,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:11,338 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:11,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:11,340 INFO L82 PathProgramCache]: Analyzing trace with hash -1610641950, now seen corresponding path program 45 times [2020-07-21 16:04:11,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:11,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338485299] [2020-07-21 16:04:11,340 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:12,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:12,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:12,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 897 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:04:12,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:12,769 INFO L134 CoverageAnalysis]: Checked inductivity of 10773 backedges. 1282 proven. 1192 refuted. 0 times theorem prover too weak. 8299 trivial. 0 not checked. [2020-07-21 16:04:12,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:17,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:17,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:18,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:18,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:18,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:19,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:19,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:22,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:22,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:23,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:24,557 INFO L134 CoverageAnalysis]: Checked inductivity of 10773 backedges. 1284 proven. 1216 refuted. 0 times theorem prover too weak. 8273 trivial. 0 not checked. [2020-07-21 16:04:24,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338485299] [2020-07-21 16:04:24,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:24,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-21 16:04:24,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887821093] [2020-07-21 16:04:24,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:04:24,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:24,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:04:24,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:04:24,558 INFO L87 Difference]: Start difference. First operand 667 states and 1418 transitions. Second operand 29 states. [2020-07-21 16:04:27,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:27,570 INFO L93 Difference]: Finished difference Result 1733 states and 3963 transitions. [2020-07-21 16:04:27,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 16:04:27,573 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 608 [2020-07-21 16:04:27,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:27,588 INFO L225 Difference]: With dead ends: 1733 [2020-07-21 16:04:27,588 INFO L226 Difference]: Without dead ends: 973 [2020-07-21 16:04:27,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1241 GetRequests, 1165 SyntacticMatches, 23 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=465, Invalid=2505, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 16:04:27,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 973 states. [2020-07-21 16:04:27,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 973 to 766. [2020-07-21 16:04:27,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 766 states. [2020-07-21 16:04:27,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 766 states to 766 states and 1692 transitions. [2020-07-21 16:04:27,651 INFO L78 Accepts]: Start accepts. Automaton has 766 states and 1692 transitions. Word has length 608 [2020-07-21 16:04:27,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:27,651 INFO L479 AbstractCegarLoop]: Abstraction has 766 states and 1692 transitions. [2020-07-21 16:04:27,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:04:27,651 INFO L276 IsEmpty]: Start isEmpty. Operand 766 states and 1692 transitions. [2020-07-21 16:04:27,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 633 [2020-07-21 16:04:27,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:27,657 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 28, 27, 24, 24, 24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 23, 21, 19, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:27,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:27,858 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:27,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:27,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1564026422, now seen corresponding path program 46 times [2020-07-21 16:04:27,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:27,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909189824] [2020-07-21 16:04:27,860 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 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:28,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:04:28,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:28,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:04:28,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 11681 backedges. 6122 proven. 477 refuted. 0 times theorem prover too weak. 5082 trivial. 0 not checked. [2020-07-21 16:04:29,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:38,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:38,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:41,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:42,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:43,495 INFO L134 CoverageAnalysis]: Checked inductivity of 11681 backedges. 581 proven. 2051 refuted. 0 times theorem prover too weak. 9049 trivial. 0 not checked. [2020-07-21 16:04:43,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909189824] [2020-07-21 16:04:43,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:43,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-21 16:04:43,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208371474] [2020-07-21 16:04:43,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:04:43,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:43,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:04:43,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:04:43,498 INFO L87 Difference]: Start difference. First operand 766 states and 1692 transitions. Second operand 27 states. [2020-07-21 16:04:46,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:46,160 INFO L93 Difference]: Finished difference Result 1535 states and 3477 transitions. [2020-07-21 16:04:46,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:04:46,162 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 632 [2020-07-21 16:04:46,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:46,169 INFO L225 Difference]: With dead ends: 1535 [2020-07-21 16:04:46,170 INFO L226 Difference]: Without dead ends: 761 [2020-07-21 16:04:46,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1285 GetRequests, 1217 SyntacticMatches, 21 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=384, Invalid=1968, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 16:04:46,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2020-07-21 16:04:46,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 665. [2020-07-21 16:04:46,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 665 states. [2020-07-21 16:04:46,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 1415 transitions. [2020-07-21 16:04:46,229 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 1415 transitions. Word has length 632 [2020-07-21 16:04:46,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:46,229 INFO L479 AbstractCegarLoop]: Abstraction has 665 states and 1415 transitions. [2020-07-21 16:04:46,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:04:46,230 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 1415 transitions. [2020-07-21 16:04:46,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 16:04:46,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:46,238 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 46, 46, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 23, 23, 23, 23, 23, 23, 23, 19, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:46,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:46,452 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:46,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:46,453 INFO L82 PathProgramCache]: Analyzing trace with hash -683549121, now seen corresponding path program 47 times [2020-07-21 16:04:46,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:46,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692175611] [2020-07-21 16:04:46,453 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:47,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:47,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:47,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:04:47,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:47,903 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 651 proven. 531 refuted. 0 times theorem prover too weak. 10972 trivial. 0 not checked. [2020-07-21 16:04:47,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:04:52,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:53,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:54,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:04:57,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 651 proven. 543 refuted. 0 times theorem prover too weak. 10960 trivial. 0 not checked. [2020-07-21 16:04:57,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692175611] [2020-07-21 16:04:57,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:04:57,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:04:57,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696952235] [2020-07-21 16:04:57,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:04:57,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:04:57,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:04:57,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:04:57,168 INFO L87 Difference]: Start difference. First operand 665 states and 1415 transitions. Second operand 16 states. [2020-07-21 16:04:57,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:04:57,754 INFO L93 Difference]: Finished difference Result 722 states and 1634 transitions. [2020-07-21 16:04:57,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:04:57,758 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 643 [2020-07-21 16:04:57,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:04:57,767 INFO L225 Difference]: With dead ends: 722 [2020-07-21 16:04:57,767 INFO L226 Difference]: Without dead ends: 718 [2020-07-21 16:04:57,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1290 GetRequests, 1261 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:04:57,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2020-07-21 16:04:57,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 686. [2020-07-21 16:04:57,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 686 states. [2020-07-21 16:04:57,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 686 states to 686 states and 1536 transitions. [2020-07-21 16:04:57,826 INFO L78 Accepts]: Start accepts. Automaton has 686 states and 1536 transitions. Word has length 643 [2020-07-21 16:04:57,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:04:57,827 INFO L479 AbstractCegarLoop]: Abstraction has 686 states and 1536 transitions. [2020-07-21 16:04:57,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:04:57,827 INFO L276 IsEmpty]: Start isEmpty. Operand 686 states and 1536 transitions. [2020-07-21 16:04:57,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 572 [2020-07-21 16:04:57,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:04:57,833 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 41, 41, 27, 27, 22, 22, 22, 22, 22, 22, 22, 20, 20, 20, 20, 20, 20, 20, 17, 14, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:04:58,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:58,034 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:04:58,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:04:58,034 INFO L82 PathProgramCache]: Analyzing trace with hash -303086631, now seen corresponding path program 48 times [2020-07-21 16:04:58,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:04:58,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33978403] [2020-07-21 16:04:58,035 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:04:59,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:04:59,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:04:59,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 1272 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:04:59,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:04:59,382 INFO L134 CoverageAnalysis]: Checked inductivity of 9450 backedges. 505 proven. 940 refuted. 0 times theorem prover too weak. 8005 trivial. 0 not checked. [2020-07-21 16:04:59,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:03,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:05,341 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 16:05:06,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:06,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:07,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:08,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:08,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:09,712 INFO L134 CoverageAnalysis]: Checked inductivity of 9450 backedges. 507 proven. 962 refuted. 0 times theorem prover too weak. 7981 trivial. 0 not checked. [2020-07-21 16:05:09,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33978403] [2020-07-21 16:05:09,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:09,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:05:09,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854329950] [2020-07-21 16:05:09,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:05:09,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:09,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:05:09,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:05:09,714 INFO L87 Difference]: Start difference. First operand 686 states and 1536 transitions. Second operand 20 states. [2020-07-21 16:05:10,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:10,664 INFO L93 Difference]: Finished difference Result 806 states and 2024 transitions. [2020-07-21 16:05:10,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:05:10,668 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 571 [2020-07-21 16:05:10,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:10,685 INFO L225 Difference]: With dead ends: 806 [2020-07-21 16:05:10,685 INFO L226 Difference]: Without dead ends: 802 [2020-07-21 16:05:10,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1148 GetRequests, 1109 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:05:10,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 802 states. [2020-07-21 16:05:10,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 802 to 671. [2020-07-21 16:05:10,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 671 states. [2020-07-21 16:05:10,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 671 states to 671 states and 1497 transitions. [2020-07-21 16:05:10,785 INFO L78 Accepts]: Start accepts. Automaton has 671 states and 1497 transitions. Word has length 571 [2020-07-21 16:05:10,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:10,786 INFO L479 AbstractCegarLoop]: Abstraction has 671 states and 1497 transitions. [2020-07-21 16:05:10,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:05:10,786 INFO L276 IsEmpty]: Start isEmpty. Operand 671 states and 1497 transitions. [2020-07-21 16:05:10,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 16:05:10,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:10,800 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 41, 41, 27, 27, 24, 24, 24, 24, 24, 24, 24, 21, 20, 20, 20, 20, 20, 20, 20, 14, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:11,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:11,015 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:11,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:11,015 INFO L82 PathProgramCache]: Analyzing trace with hash -402027253, now seen corresponding path program 49 times [2020-07-21 16:05:11,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:11,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128516010] [2020-07-21 16:05:11,016 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:12,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:12,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:12,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 1326 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:05:12,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 10358 backedges. 496 proven. 815 refuted. 0 times theorem prover too weak. 9047 trivial. 0 not checked. [2020-07-21 16:05:12,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:16,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:18,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:19,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:20,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:22,073 INFO L134 CoverageAnalysis]: Checked inductivity of 10358 backedges. 498 proven. 829 refuted. 0 times theorem prover too weak. 9031 trivial. 0 not checked. [2020-07-21 16:05:22,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128516010] [2020-07-21 16:05:22,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:22,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 16:05:22,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340616528] [2020-07-21 16:05:22,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:05:22,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:22,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:05:22,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:05:22,076 INFO L87 Difference]: Start difference. First operand 671 states and 1497 transitions. Second operand 18 states. [2020-07-21 16:05:22,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:22,831 INFO L93 Difference]: Finished difference Result 818 states and 2129 transitions. [2020-07-21 16:05:22,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:05:22,835 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-21 16:05:22,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:22,846 INFO L225 Difference]: With dead ends: 818 [2020-07-21 16:05:22,846 INFO L226 Difference]: Without dead ends: 814 [2020-07-21 16:05:22,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:05:22,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 814 states. [2020-07-21 16:05:22,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 814 to 677. [2020-07-21 16:05:22,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 677 states. [2020-07-21 16:05:22,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 1539 transitions. [2020-07-21 16:05:22,900 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 1539 transitions. Word has length 595 [2020-07-21 16:05:22,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:22,901 INFO L479 AbstractCegarLoop]: Abstraction has 677 states and 1539 transitions. [2020-07-21 16:05:22,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:05:22,901 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 1539 transitions. [2020-07-21 16:05:22,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 644 [2020-07-21 16:05:22,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:22,907 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 46, 46, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 23, 23, 23, 23, 23, 23, 23, 19, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:23,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:23,108 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:23,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:23,109 INFO L82 PathProgramCache]: Analyzing trace with hash -939871553, now seen corresponding path program 50 times [2020-07-21 16:05:23,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:23,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910919839] [2020-07-21 16:05:23,110 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 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:24,238 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:24,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:24,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:05:24,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:24,557 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 1246 proven. 409 refuted. 0 times theorem prover too weak. 10499 trivial. 0 not checked. [2020-07-21 16:05:24,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:28,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:29,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:29,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:30,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:30,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:31,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:32,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:37,681 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 1250 proven. 429 refuted. 0 times theorem prover too weak. 10475 trivial. 0 not checked. [2020-07-21 16:05:37,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910919839] [2020-07-21 16:05:37,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:37,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:05:37,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082504625] [2020-07-21 16:05:37,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:05:37,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:37,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:05:37,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:05:37,683 INFO L87 Difference]: Start difference. First operand 677 states and 1539 transitions. Second operand 20 states. [2020-07-21 16:05:38,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:38,585 INFO L93 Difference]: Finished difference Result 703 states and 1591 transitions. [2020-07-21 16:05:38,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:05:38,589 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 643 [2020-07-21 16:05:38,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:38,598 INFO L225 Difference]: With dead ends: 703 [2020-07-21 16:05:38,599 INFO L226 Difference]: Without dead ends: 699 [2020-07-21 16:05:38,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1292 GetRequests, 1253 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:05:38,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2020-07-21 16:05:38,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 677. [2020-07-21 16:05:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 677 states. [2020-07-21 16:05:38,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 1539 transitions. [2020-07-21 16:05:38,668 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 1539 transitions. Word has length 643 [2020-07-21 16:05:38,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:38,669 INFO L479 AbstractCegarLoop]: Abstraction has 677 states and 1539 transitions. [2020-07-21 16:05:38,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:05:38,669 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 1539 transitions. [2020-07-21 16:05:38,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 656 [2020-07-21 16:05:38,680 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:38,680 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 48, 48, 27, 27, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 24, 21, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:38,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:38,894 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:38,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:38,895 INFO L82 PathProgramCache]: Analyzing trace with hash 794344224, now seen corresponding path program 51 times [2020-07-21 16:05:38,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:38,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692798791] [2020-07-21 16:05:38,896 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:39,933 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:39,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:39,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 1461 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:05:39,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:40,211 INFO L134 CoverageAnalysis]: Checked inductivity of 12618 backedges. 773 proven. 912 refuted. 0 times theorem prover too weak. 10933 trivial. 0 not checked. [2020-07-21 16:05:40,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:48,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:48,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:49,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:50,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:50,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:51,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:52,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:05:53,999 INFO L134 CoverageAnalysis]: Checked inductivity of 12618 backedges. 777 proven. 932 refuted. 0 times theorem prover too weak. 10909 trivial. 0 not checked. [2020-07-21 16:05:54,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692798791] [2020-07-21 16:05:54,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:05:54,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 16:05:54,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464506439] [2020-07-21 16:05:54,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:05:54,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:05:54,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:05:54,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:05:54,001 INFO L87 Difference]: Start difference. First operand 677 states and 1539 transitions. Second operand 20 states. [2020-07-21 16:05:54,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:05:54,637 INFO L93 Difference]: Finished difference Result 723 states and 1651 transitions. [2020-07-21 16:05:54,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:05:54,640 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 655 [2020-07-21 16:05:54,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:05:54,649 INFO L225 Difference]: With dead ends: 723 [2020-07-21 16:05:54,650 INFO L226 Difference]: Without dead ends: 719 [2020-07-21 16:05:54,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1316 GetRequests, 1277 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:05:54,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2020-07-21 16:05:54,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 681. [2020-07-21 16:05:54,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 681 states. [2020-07-21 16:05:54,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 681 states to 681 states and 1515 transitions. [2020-07-21 16:05:54,692 INFO L78 Accepts]: Start accepts. Automaton has 681 states and 1515 transitions. Word has length 655 [2020-07-21 16:05:54,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:05:54,693 INFO L479 AbstractCegarLoop]: Abstraction has 681 states and 1515 transitions. [2020-07-21 16:05:54,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:05:54,693 INFO L276 IsEmpty]: Start isEmpty. Operand 681 states and 1515 transitions. [2020-07-21 16:05:54,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 692 [2020-07-21 16:05:54,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:05:54,699 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 50, 50, 28, 27, 27, 27, 27, 27, 27, 27, 27, 27, 25, 25, 25, 25, 25, 25, 25, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:05:54,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:54,900 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:05:54,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:05:54,901 INFO L82 PathProgramCache]: Analyzing trace with hash 441775227, now seen corresponding path program 6 times [2020-07-21 16:05:54,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:05:54,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210914386] [2020-07-21 16:05:54,902 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 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:05:56,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:05:56,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:05:56,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 1542 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:05:56,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:05:56,589 INFO L134 CoverageAnalysis]: Checked inductivity of 14146 backedges. 326 proven. 1932 refuted. 0 times theorem prover too weak. 11888 trivial. 0 not checked. [2020-07-21 16:05:56,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:05:59,973 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:06:00,077 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:06:00,189 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:06:00,306 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:06:00,417 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 16:06:06,833 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:06:06,951 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:06:07,066 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:06:07,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:10,188 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:06:10,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:13,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:14,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:15,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:16,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 14146 backedges. 326 proven. 1972 refuted. 0 times theorem prover too weak. 11848 trivial. 0 not checked. [2020-07-21 16:06:17,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210914386] [2020-07-21 16:06:17,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:06:17,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 16:06:17,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56956204] [2020-07-21 16:06:17,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:06:17,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:06:17,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:06:17,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:06:17,099 INFO L87 Difference]: Start difference. First operand 681 states and 1515 transitions. Second operand 24 states. [2020-07-21 16:06:18,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:06:18,485 INFO L93 Difference]: Finished difference Result 697 states and 1557 transitions. [2020-07-21 16:06:18,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:06:18,491 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 691 [2020-07-21 16:06:18,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:06:18,504 INFO L225 Difference]: With dead ends: 697 [2020-07-21 16:06:18,504 INFO L226 Difference]: Without dead ends: 693 [2020-07-21 16:06:18,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1391 GetRequests, 1342 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:06:18,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2020-07-21 16:06:18,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 611. [2020-07-21 16:06:18,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 611 states. [2020-07-21 16:06:18,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 1269 transitions. [2020-07-21 16:06:18,564 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 1269 transitions. Word has length 691 [2020-07-21 16:06:18,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:06:18,565 INFO L479 AbstractCegarLoop]: Abstraction has 611 states and 1269 transitions. [2020-07-21 16:06:18,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:06:18,565 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 1269 transitions. [2020-07-21 16:06:18,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1445 [2020-07-21 16:06:18,580 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:06:18,581 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 103, 103, 68, 67, 57, 57, 57, 57, 57, 57, 57, 51, 51, 51, 51, 51, 51, 51, 47, 35, 16, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:06:18,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:18,788 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:06:18,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:06:18,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1501809399, now seen corresponding path program 52 times [2020-07-21 16:06:18,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:06:18,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413313429] [2020-07-21 16:06:18,791 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 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:06:20,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:06:20,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:06:20,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 2128 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:06:20,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:06:21,814 INFO L134 CoverageAnalysis]: Checked inductivity of 62749 backedges. 32961 proven. 2155 refuted. 0 times theorem prover too weak. 27633 trivial. 0 not checked. [2020-07-21 16:06:21,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:06:44,374 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:06:44,483 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:06:44,587 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:06:48,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:48,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:50,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:51,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:51,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:52,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:52,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:52,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:53,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:56,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:56,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:58,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:06:59,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:00,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 62749 backedges. 1708 proven. 6122 refuted. 0 times theorem prover too weak. 54919 trivial. 0 not checked. [2020-07-21 16:07:01,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413313429] [2020-07-21 16:07:01,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:01,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-21 16:07:01,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572538711] [2020-07-21 16:07:01,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 16:07:01,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:01,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 16:07:01,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:07:01,564 INFO L87 Difference]: Start difference. First operand 611 states and 1269 transitions. Second operand 33 states. [2020-07-21 16:07:08,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:07:08,771 INFO L93 Difference]: Finished difference Result 1445 states and 3195 transitions. [2020-07-21 16:07:08,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-21 16:07:08,779 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 1444 [2020-07-21 16:07:08,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:07:08,793 INFO L225 Difference]: With dead ends: 1445 [2020-07-21 16:07:08,794 INFO L226 Difference]: Without dead ends: 784 [2020-07-21 16:07:08,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2919 GetRequests, 2829 SyntacticMatches, 27 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=635, Invalid=3525, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:07:08,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 784 states. [2020-07-21 16:07:08,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 784 to 669. [2020-07-21 16:07:08,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 669 states. [2020-07-21 16:07:08,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 669 states to 669 states and 1469 transitions. [2020-07-21 16:07:08,848 INFO L78 Accepts]: Start accepts. Automaton has 669 states and 1469 transitions. Word has length 1444 [2020-07-21 16:07:08,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:07:08,849 INFO L479 AbstractCegarLoop]: Abstraction has 669 states and 1469 transitions. [2020-07-21 16:07:08,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 16:07:08,849 INFO L276 IsEmpty]: Start isEmpty. Operand 669 states and 1469 transitions. [2020-07-21 16:07:08,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1416 [2020-07-21 16:07:08,865 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:07:08,866 INFO L422 BasicCegarLoop]: trace histogram [113, 113, 100, 100, 65, 65, 56, 56, 56, 56, 56, 56, 56, 50, 50, 50, 50, 50, 50, 50, 48, 35, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:07:09,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:09,073 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:07:09,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:07:09,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1616609609, now seen corresponding path program 53 times [2020-07-21 16:07:09,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:07:09,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261007754] [2020-07-21 16:07:09,075 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 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:07:10,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:07:10,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:07:10,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 2083 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 16:07:10,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:07:11,784 INFO L134 CoverageAnalysis]: Checked inductivity of 60332 backedges. 2775 proven. 5571 refuted. 0 times theorem prover too weak. 51986 trivial. 0 not checked. [2020-07-21 16:07:11,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:07:17,247 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:07:18,161 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:07:18,274 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:07:18,391 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:07:18,508 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:07:22,460 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:07:22,565 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:07:22,677 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:07:22,789 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:07:22,898 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 16:07:29,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:34,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:37,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:39,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:40,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:40,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:41,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:44,558 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:07:44,665 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:07:44,871 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:07:50,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:50,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:53,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:55,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:56,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:56,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:56,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:56,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:56,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:57,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:07:57,974 INFO L134 CoverageAnalysis]: Checked inductivity of 60332 backedges. 2781 proven. 5622 refuted. 0 times theorem prover too weak. 51929 trivial. 0 not checked. [2020-07-21 16:07:57,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261007754] [2020-07-21 16:07:57,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:07:57,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 39 [2020-07-21 16:07:57,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436986524] [2020-07-21 16:07:57,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 16:07:57,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:07:57,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 16:07:57,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1329, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:07:57,977 INFO L87 Difference]: Start difference. First operand 669 states and 1469 transitions. Second operand 39 states. [2020-07-21 16:08:07,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:07,978 INFO L93 Difference]: Finished difference Result 1589 states and 3913 transitions. [2020-07-21 16:08:07,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-07-21 16:08:07,985 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1415 [2020-07-21 16:08:07,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:08,004 INFO L225 Difference]: With dead ends: 1589 [2020-07-21 16:08:08,004 INFO L226 Difference]: Without dead ends: 920 [2020-07-21 16:08:08,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2868 GetRequests, 2763 SyntacticMatches, 29 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=848, Invalid=5158, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 16:08:08,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2020-07-21 16:08:08,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 836. [2020-07-21 16:08:08,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 836 states. [2020-07-21 16:08:08,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 836 states to 836 states and 2053 transitions. [2020-07-21 16:08:08,075 INFO L78 Accepts]: Start accepts. Automaton has 836 states and 2053 transitions. Word has length 1415 [2020-07-21 16:08:08,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:08,075 INFO L479 AbstractCegarLoop]: Abstraction has 836 states and 2053 transitions. [2020-07-21 16:08:08,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 16:08:08,076 INFO L276 IsEmpty]: Start isEmpty. Operand 836 states and 2053 transitions. [2020-07-21 16:08:08,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 849 [2020-07-21 16:08:08,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:08,086 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 34, 33, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 31, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:08,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:08,287 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:08,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:08,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1379857503, now seen corresponding path program 54 times [2020-07-21 16:08:08,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:08,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169313593] [2020-07-21 16:08:08,289 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 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:09,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:09,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:09,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 1242 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:08:09,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:10,618 INFO L134 CoverageAnalysis]: Checked inductivity of 21441 backedges. 11144 proven. 827 refuted. 0 times theorem prover too weak. 9470 trivial. 0 not checked. [2020-07-21 16:08:10,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:27,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:27,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:28,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:28,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:29,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:30,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:34,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:34,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:36,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:37,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:39,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:08:42,613 INFO L134 CoverageAnalysis]: Checked inductivity of 21441 backedges. 1874 proven. 2197 refuted. 0 times theorem prover too weak. 17370 trivial. 0 not checked. [2020-07-21 16:08:42,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169313593] [2020-07-21 16:08:42,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:08:42,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-21 16:08:42,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346557492] [2020-07-21 16:08:42,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 16:08:42,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:08:42,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 16:08:42,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:08:42,615 INFO L87 Difference]: Start difference. First operand 836 states and 2053 transitions. Second operand 31 states. [2020-07-21 16:08:47,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:08:47,525 INFO L93 Difference]: Finished difference Result 1723 states and 4276 transitions. [2020-07-21 16:08:47,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:08:47,531 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 848 [2020-07-21 16:08:47,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:08:47,548 INFO L225 Difference]: With dead ends: 1723 [2020-07-21 16:08:47,549 INFO L226 Difference]: Without dead ends: 884 [2020-07-21 16:08:47,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1715 GetRequests, 1642 SyntacticMatches, 25 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=377, Invalid=2073, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:08:47,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 884 states. [2020-07-21 16:08:47,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 884 to 792. [2020-07-21 16:08:47,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-21 16:08:47,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1838 transitions. [2020-07-21 16:08:47,619 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1838 transitions. Word has length 848 [2020-07-21 16:08:47,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:08:47,620 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 1838 transitions. [2020-07-21 16:08:47,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 16:08:47,620 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1838 transitions. [2020-07-21 16:08:47,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1810 [2020-07-21 16:08:47,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:08:47,647 INFO L422 BasicCegarLoop]: trace histogram [138, 138, 135, 135, 82, 82, 69, 69, 69, 69, 69, 69, 69, 67, 67, 67, 67, 67, 67, 67, 56, 53, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:08:47,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:47,848 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:08:47,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:08:47,850 INFO L82 PathProgramCache]: Analyzing trace with hash -730838337, now seen corresponding path program 55 times [2020-07-21 16:08:47,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:08:47,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949514964] [2020-07-21 16:08:47,851 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 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:08:49,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:08:49,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:08:49,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 2663 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:08:49,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:08:51,328 INFO L134 CoverageAnalysis]: Checked inductivity of 98862 backedges. 51069 proven. 3237 refuted. 0 times theorem prover too weak. 44556 trivial. 0 not checked. [2020-07-21 16:08:51,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:08:55,714 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:08:55,819 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:22,382 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:22,488 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:23,357 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:23,461 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:23,580 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:23,695 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:26,264 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:26,370 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:09:27,381 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:27,492 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:09:27,613 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:27,736 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:09:27,843 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:09:35,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:38,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:38,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:40,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:41,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:41,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:42,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:42,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:42,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:42,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:42,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:48,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:48,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:49,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:50,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:50,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:51,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:51,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:51,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:09:53,833 INFO L134 CoverageAnalysis]: Checked inductivity of 98862 backedges. 2085 proven. 7841 refuted. 0 times theorem prover too weak. 88936 trivial. 0 not checked. [2020-07-21 16:09:53,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949514964] [2020-07-21 16:09:53,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:09:53,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-21 16:09:53,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980405317] [2020-07-21 16:09:53,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:09:53,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:09:53,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:09:53,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:09:53,837 INFO L87 Difference]: Start difference. First operand 792 states and 1838 transitions. Second operand 35 states. [2020-07-21 16:10:03,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:03,169 INFO L93 Difference]: Finished difference Result 2021 states and 5236 transitions. [2020-07-21 16:10:03,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 16:10:03,176 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1809 [2020-07-21 16:10:03,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:03,199 INFO L225 Difference]: With dead ends: 2021 [2020-07-21 16:10:03,199 INFO L226 Difference]: Without dead ends: 1235 [2020-07-21 16:10:03,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3649 GetRequests, 3559 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 962 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=660, Invalid=3762, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 16:10:03,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1235 states. [2020-07-21 16:10:03,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1235 to 1067. [2020-07-21 16:10:03,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1067 states. [2020-07-21 16:10:03,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1067 states to 1067 states and 2819 transitions. [2020-07-21 16:10:03,307 INFO L78 Accepts]: Start accepts. Automaton has 1067 states and 2819 transitions. Word has length 1809 [2020-07-21 16:10:03,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:03,308 INFO L479 AbstractCegarLoop]: Abstraction has 1067 states and 2819 transitions. [2020-07-21 16:10:03,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:10:03,309 INFO L276 IsEmpty]: Start isEmpty. Operand 1067 states and 2819 transitions. [2020-07-21 16:10:03,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2020-07-21 16:10:03,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:03,328 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 68, 68, 44, 44, 39, 39, 39, 39, 39, 39, 39, 35, 34, 34, 34, 34, 34, 34, 34, 24, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:03,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:03,529 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:03,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:03,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1585578922, now seen corresponding path program 56 times [2020-07-21 16:10:03,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:03,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065759232] [2020-07-21 16:10:03,531 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 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:05,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:10:05,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:05,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 2177 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:10:05,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:05,934 INFO L134 CoverageAnalysis]: Checked inductivity of 28536 backedges. 462 proven. 2879 refuted. 0 times theorem prover too weak. 25195 trivial. 0 not checked. [2020-07-21 16:10:05,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:07,281 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 16:10:07,802 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 16:10:07,918 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:08,049 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:08,786 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:08,913 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:09,047 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:09,175 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:10,275 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:10,428 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:10,573 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:10,717 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:12,171 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:12,315 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:12,477 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:10:12,624 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:10:12,778 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 16:10:12,924 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 16:10:13,072 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 16:10:13,201 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:10:13,317 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 16:10:13,423 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:13,532 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:23,218 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:24,319 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:24,452 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:10:24,598 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:24,746 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:24,880 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:25,005 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:10:25,123 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:25,232 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 16:10:25,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:25,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:30,840 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:30,957 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:10:31,081 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:31,204 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:10:31,312 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:31,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:36,096 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:36,206 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 16:10:36,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:40,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:41,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:41,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:42,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:42,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:42,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:43,090 INFO L134 CoverageAnalysis]: Checked inductivity of 28536 backedges. 462 proven. 2923 refuted. 0 times theorem prover too weak. 25151 trivial. 0 not checked. [2020-07-21 16:10:43,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065759232] [2020-07-21 16:10:43,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:43,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 16:10:43,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950784751] [2020-07-21 16:10:43,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:10:43,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:43,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:10:43,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:10:43,093 INFO L87 Difference]: Start difference. First operand 1067 states and 2819 transitions. Second operand 24 states. [2020-07-21 16:10:45,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:45,003 INFO L93 Difference]: Finished difference Result 1090 states and 2867 transitions. [2020-07-21 16:10:45,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:10:45,011 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 977 [2020-07-21 16:10:45,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:45,045 INFO L225 Difference]: With dead ends: 1090 [2020-07-21 16:10:45,045 INFO L226 Difference]: Without dead ends: 1086 [2020-07-21 16:10:45,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1962 GetRequests, 1913 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:10:45,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1086 states. [2020-07-21 16:10:45,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1086 to 1067. [2020-07-21 16:10:45,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1067 states. [2020-07-21 16:10:45,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1067 states to 1067 states and 2819 transitions. [2020-07-21 16:10:45,223 INFO L78 Accepts]: Start accepts. Automaton has 1067 states and 2819 transitions. Word has length 977 [2020-07-21 16:10:45,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:45,223 INFO L479 AbstractCegarLoop]: Abstraction has 1067 states and 2819 transitions. [2020-07-21 16:10:45,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:10:45,224 INFO L276 IsEmpty]: Start isEmpty. Operand 1067 states and 2819 transitions. [2020-07-21 16:10:45,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 822 [2020-07-21 16:10:45,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:45,239 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 60, 60, 44, 44, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 17, 16, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:45,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:45,440 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:45,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:45,441 INFO L82 PathProgramCache]: Analyzing trace with hash -972924317, now seen corresponding path program 57 times [2020-07-21 16:10:45,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:45,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38256055] [2020-07-21 16:10:45,442 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 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:47,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:10:47,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:47,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:10:47,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:47,775 INFO L134 CoverageAnalysis]: Checked inductivity of 19772 backedges. 428 proven. 2039 refuted. 0 times theorem prover too weak. 17305 trivial. 0 not checked. [2020-07-21 16:10:47,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:51,023 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:10:52,234 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:52,362 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:10:52,500 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:52,644 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:10:52,794 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:10:52,930 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 16:10:53,061 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:10:53,185 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:10:53,294 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 16:11:01,367 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:01,861 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:01,965 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:02,086 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:02,196 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:02,948 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:03,058 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:03,186 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:03,320 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:03,456 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:11:03,576 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:11:03,688 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:03,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:03,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,959 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:09,062 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:09,181 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:09,291 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:09,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:13,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:13,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:15,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:15,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:16,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:16,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,824 INFO L134 CoverageAnalysis]: Checked inductivity of 19772 backedges. 428 proven. 2072 refuted. 0 times theorem prover too weak. 17272 trivial. 0 not checked. [2020-07-21 16:11:17,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38256055] [2020-07-21 16:11:17,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:17,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:11:17,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577173648] [2020-07-21 16:11:17,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:11:17,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:17,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:11:17,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:11:17,827 INFO L87 Difference]: Start difference. First operand 1067 states and 2819 transitions. Second operand 22 states. [2020-07-21 16:11:18,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:18,954 INFO L93 Difference]: Finished difference Result 1093 states and 2917 transitions. [2020-07-21 16:11:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:11:18,959 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 821 [2020-07-21 16:11:18,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:18,973 INFO L225 Difference]: With dead ends: 1093 [2020-07-21 16:11:18,973 INFO L226 Difference]: Without dead ends: 1089 [2020-07-21 16:11:18,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1649 GetRequests, 1605 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:11:18,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1089 states. [2020-07-21 16:11:19,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1089 to 1069. [2020-07-21 16:11:19,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1069 states. [2020-07-21 16:11:19,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1069 states to 1069 states and 2843 transitions. [2020-07-21 16:11:19,049 INFO L78 Accepts]: Start accepts. Automaton has 1069 states and 2843 transitions. Word has length 821 [2020-07-21 16:11:19,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:19,050 INFO L479 AbstractCegarLoop]: Abstraction has 1069 states and 2843 transitions. [2020-07-21 16:11:19,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:11:19,050 INFO L276 IsEmpty]: Start isEmpty. Operand 1069 states and 2843 transitions. [2020-07-21 16:11:19,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 894 [2020-07-21 16:11:19,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:19,063 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 62, 62, 44, 44, 35, 35, 35, 35, 35, 35, 35, 31, 31, 31, 31, 31, 31, 31, 27, 18, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:19,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:19,264 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:19,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:19,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1423398451, now seen corresponding path program 58 times [2020-07-21 16:11:19,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:19,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024469378] [2020-07-21 16:11:19,266 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 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:20,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:20,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:20,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 1988 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:11:20,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:21,613 INFO L134 CoverageAnalysis]: Checked inductivity of 23636 backedges. 551 proven. 2136 refuted. 0 times theorem prover too weak. 20949 trivial. 0 not checked. [2020-07-21 16:11:21,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:23,416 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:11:24,200 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:24,318 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:24,445 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:24,573 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:25,574 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:25,711 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:25,856 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:26,003 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:27,516 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:27,672 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:11:27,828 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:27,992 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:28,149 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:11:28,287 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:11:28,416 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 16:11:28,538 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 16:11:28,652 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 16:11:28,758 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:37,228 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-21 16:11:38,060 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:11:38,273 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:38,386 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:11:39,364 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:39,497 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:11:39,642 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:39,787 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:39,926 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 16:11:40,053 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 16:11:40,169 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:11:40,273 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:11:40,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:46,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:46,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:49,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:51,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:52,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:52,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:52,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:53,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 23636 backedges. 553 proven. 2167 refuted. 0 times theorem prover too weak. 20916 trivial. 0 not checked. [2020-07-21 16:11:54,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024469378] [2020-07-21 16:11:54,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:54,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:11:54,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847802935] [2020-07-21 16:11:54,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:11:54,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:54,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:11:54,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:11:54,791 INFO L87 Difference]: Start difference. First operand 1069 states and 2843 transitions. Second operand 22 states. [2020-07-21 16:11:56,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:56,782 INFO L93 Difference]: Finished difference Result 1352 states and 4347 transitions. [2020-07-21 16:11:56,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:11:56,792 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 893 [2020-07-21 16:11:56,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:56,828 INFO L225 Difference]: With dead ends: 1352 [2020-07-21 16:11:56,829 INFO L226 Difference]: Without dead ends: 1348 [2020-07-21 16:11:56,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1793 GetRequests, 1749 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:11:56,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1348 states. [2020-07-21 16:11:57,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1348 to 1120. [2020-07-21 16:11:57,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1120 states. [2020-07-21 16:11:57,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1120 states to 1120 states and 3155 transitions. [2020-07-21 16:11:57,101 INFO L78 Accepts]: Start accepts. Automaton has 1120 states and 3155 transitions. Word has length 893 [2020-07-21 16:11:57,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:57,103 INFO L479 AbstractCegarLoop]: Abstraction has 1120 states and 3155 transitions. [2020-07-21 16:11:57,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:11:57,103 INFO L276 IsEmpty]: Start isEmpty. Operand 1120 states and 3155 transitions. [2020-07-21 16:11:57,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 930 [2020-07-21 16:11:57,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:57,140 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 66, 66, 44, 44, 36, 36, 36, 36, 36, 36, 36, 33, 33, 33, 33, 33, 33, 33, 29, 22, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:11:57,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:57,355 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:57,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:57,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1012289064, now seen corresponding path program 59 times [2020-07-21 16:11:57,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:57,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305204030] [2020-07-21 16:11:57,358 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 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:59,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:59,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:59,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 2069 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:11:59,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 25616 backedges. 509 proven. 2294 refuted. 0 times theorem prover too weak. 22813 trivial. 0 not checked. [2020-07-21 16:11:59,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:01,941 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:02,599 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:02,708 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:02,824 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:02,947 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:03,953 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:04,095 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:04,244 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:04,395 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:06,087 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:12:06,243 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 16:12:06,409 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:06,574 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:06,730 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 16:12:06,876 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:12:07,017 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 16:12:07,147 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 16:12:07,263 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 16:12:07,370 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:16,657 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:16,767 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:17,410 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:17,528 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:17,654 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:17,780 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:18,745 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:18,863 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:19,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:25,150 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:25,261 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:25,932 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:26,051 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:26,177 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:26,304 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:26,425 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 16:12:26,537 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 16:12:26,642 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 16:12:26,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:26,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:30,944 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:31,056 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:31,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:31,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:33,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:33,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:35,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:36,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:36,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:12:37,766 INFO L134 CoverageAnalysis]: Checked inductivity of 25616 backedges. 509 proven. 2327 refuted. 0 times theorem prover too weak. 22780 trivial. 0 not checked. [2020-07-21 16:12:37,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305204030] [2020-07-21 16:12:37,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:12:37,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 16:12:37,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957611558] [2020-07-21 16:12:37,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:12:37,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:12:37,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:12:37,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:12:37,770 INFO L87 Difference]: Start difference. First operand 1120 states and 3155 transitions. Second operand 22 states. [2020-07-21 16:12:39,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:12:39,760 INFO L93 Difference]: Finished difference Result 1342 states and 3977 transitions. [2020-07-21 16:12:39,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:12:39,768 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 929 [2020-07-21 16:12:39,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:12:39,805 INFO L225 Difference]: With dead ends: 1342 [2020-07-21 16:12:39,806 INFO L226 Difference]: Without dead ends: 1338 [2020-07-21 16:12:39,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1865 GetRequests, 1821 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:12:39,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1338 states. [2020-07-21 16:12:40,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1338 to 1213. [2020-07-21 16:12:40,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1213 states. [2020-07-21 16:12:40,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 3336 transitions. [2020-07-21 16:12:40,066 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 3336 transitions. Word has length 929 [2020-07-21 16:12:40,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:12:40,067 INFO L479 AbstractCegarLoop]: Abstraction has 1213 states and 3336 transitions. [2020-07-21 16:12:40,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:12:40,067 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 3336 transitions. [2020-07-21 16:12:40,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 894 [2020-07-21 16:12:40,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:12:40,102 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 62, 62, 44, 44, 35, 35, 35, 35, 35, 35, 35, 31, 31, 31, 31, 31, 31, 31, 27, 18, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:12:40,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:40,316 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:12:40,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:12:40,316 INFO L82 PathProgramCache]: Analyzing trace with hash -2072841357, now seen corresponding path program 60 times [2020-07-21 16:12:40,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:12:40,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763199412] [2020-07-21 16:12:40,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:12:41,996 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:12:41,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:12:42,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 1988 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:12:42,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:12:42,733 INFO L134 CoverageAnalysis]: Checked inductivity of 23636 backedges. 546 proven. 1828 refuted. 0 times theorem prover too weak. 21262 trivial. 0 not checked. [2020-07-21 16:12:42,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:12:45,093 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-21 16:12:46,063 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:46,171 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 16:12:46,287 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:46,409 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 16:12:47,763 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:47,875 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 16:12:47,993 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:48,116 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 16:12:48,230 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:12:48,336 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47