/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_7.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:50:15,416 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:50:15,419 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:50:15,431 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:50:15,432 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:50:15,433 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:50:15,434 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:50:15,436 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:50:15,438 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:50:15,439 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:50:15,440 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:50:15,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:50:15,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:50:15,442 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:50:15,444 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:50:15,445 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:50:15,445 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:50:15,446 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:50:15,448 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:50:15,450 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:50:15,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:50:15,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:50:15,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:50:15,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:50:15,458 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 13:50:15,458 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 13:50:15,458 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 13:50:15,459 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 13:50:15,460 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 13:50:15,460 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 13:50:15,461 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 13:50:15,461 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 13:50:15,462 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 13:50:15,463 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 13:50:15,464 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 13:50:15,464 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 13:50:15,465 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 13:50:15,465 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 13:50:15,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:50:15,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:50:15,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:50:15,468 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:50:15,488 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:50:15,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:50:15,491 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:50:15,491 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:50:15,491 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:50:15,492 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:50:15,492 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:50:15,492 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:50:15,493 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:50:15,493 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:50:15,493 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:50:15,493 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:50:15,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:50:15,494 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:50:15,494 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:50:15,494 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:50:15,494 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:50:15,494 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:50:15,495 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:50:15,495 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:50:15,495 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:50:15,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:15,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:50:15,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:50:15,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:50:15,498 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:50:15,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:15,498 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:50:15,498 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:50:15,498 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:50:15,830 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:50:15,844 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:50:15,848 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:50:15,849 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:50:15,850 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:50:15,850 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-07-20 13:50:15,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85e64b7c4/19e2e3731ae04e229b54595366318e05/FLAG62c9ebea0 [2020-07-20 13:50:16,346 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:50:16,346 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-07-20 13:50:16,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85e64b7c4/19e2e3731ae04e229b54595366318e05/FLAG62c9ebea0 [2020-07-20 13:50:16,712 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85e64b7c4/19e2e3731ae04e229b54595366318e05 [2020-07-20 13:50:16,720 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:50:16,723 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:50:16,724 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:16,724 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:50:16,731 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:50:16,733 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,735 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60bac6e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16, skipping insertion in model container [2020-07-20 13:50:16,736 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,744 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:50:16,764 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:50:16,923 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:16,928 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:50:16,953 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:16,966 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:50:16,966 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16 WrapperNode [2020-07-20 13:50:16,967 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:16,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:50:16,967 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:50:16,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:50:16,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,985 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,986 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:16,998 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:17,000 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... [2020-07-20 13:50:17,003 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:50:17,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:50:17,004 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:50:17,004 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:50:17,005 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:17,151 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:50:17,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:50:17,152 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:50:17,152 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:50:17,152 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:50:17,152 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:50:17,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:50:17,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:50:17,438 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:50:17,438 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 13:50:17,445 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:17 BoogieIcfgContainer [2020-07-20 13:50:17,446 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:50:17,448 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:50:17,449 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:50:17,454 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:50:17,454 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:50:16" (1/3) ... [2020-07-20 13:50:17,455 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18fb98fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:17, skipping insertion in model container [2020-07-20 13:50:17,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:16" (2/3) ... [2020-07-20 13:50:17,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18fb98fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:17, skipping insertion in model container [2020-07-20 13:50:17,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:17" (3/3) ... [2020-07-20 13:50:17,459 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-07-20 13:50:17,472 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:50:17,481 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:50:17,498 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:50:17,528 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:50:17,529 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:50:17,529 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:50:17,529 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:50:17,529 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:50:17,529 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:50:17,529 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:50:17,530 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:50:17,553 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-20 13:50:17,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 13:50:17,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:17,561 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:17,562 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:17,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:17,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1819770524, now seen corresponding path program 1 times [2020-07-20 13:50:17,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:17,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997574412] [2020-07-20 13:50:17,579 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:17,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:17,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:17,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:17,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:17,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:17,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:17,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997574412] [2020-07-20 13:50:17,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:17,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:17,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316086114] [2020-07-20 13:50:17,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:17,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:17,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:17,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:17,775 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-07-20 13:50:17,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:17,839 INFO L93 Difference]: Finished difference Result 69 states and 114 transitions. [2020-07-20 13:50:17,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:17,841 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 13:50:17,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:17,860 INFO L225 Difference]: With dead ends: 69 [2020-07-20 13:50:17,860 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 13:50:17,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:17,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 13:50:17,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2020-07-20 13:50:17,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 13:50:17,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 65 transitions. [2020-07-20 13:50:17,911 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 65 transitions. Word has length 17 [2020-07-20 13:50:17,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:17,912 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 65 transitions. [2020-07-20 13:50:17,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:17,912 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 65 transitions. [2020-07-20 13:50:17,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 13:50:17,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:17,914 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:18,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,129 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:18,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:18,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1426743514, now seen corresponding path program 1 times [2020-07-20 13:50:18,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:18,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941797702] [2020-07-20 13:50:18,132 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:18,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:18,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:18,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:18,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:18,215 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:18,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941797702] [2020-07-20 13:50:18,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:18,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:18,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784303866] [2020-07-20 13:50:18,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:18,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:18,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:18,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,225 INFO L87 Difference]: Start difference. First operand 38 states and 65 transitions. Second operand 3 states. [2020-07-20 13:50:18,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:18,268 INFO L93 Difference]: Finished difference Result 87 states and 152 transitions. [2020-07-20 13:50:18,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:18,268 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 13:50:18,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:18,270 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:50:18,271 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 13:50:18,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 13:50:18,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-07-20 13:50:18,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 13:50:18,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 89 transitions. [2020-07-20 13:50:18,284 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 89 transitions. Word has length 17 [2020-07-20 13:50:18,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:18,284 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 89 transitions. [2020-07-20 13:50:18,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:18,285 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 89 transitions. [2020-07-20 13:50:18,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:50:18,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:18,286 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:18,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,500 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:18,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:18,501 INFO L82 PathProgramCache]: Analyzing trace with hash 578525748, now seen corresponding path program 1 times [2020-07-20 13:50:18,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:18,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752119413] [2020-07-20 13:50:18,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,570 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:18,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:18,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:18,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:18,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:18,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:18,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752119413] [2020-07-20 13:50:18,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:18,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:18,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964895351] [2020-07-20 13:50:18,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:18,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:18,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:18,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,600 INFO L87 Difference]: Start difference. First operand 52 states and 89 transitions. Second operand 3 states. [2020-07-20 13:50:18,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:18,635 INFO L93 Difference]: Finished difference Result 97 states and 167 transitions. [2020-07-20 13:50:18,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:18,637 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:50:18,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:18,640 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:50:18,640 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 13:50:18,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 13:50:18,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 69. [2020-07-20 13:50:18,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-20 13:50:18,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 119 transitions. [2020-07-20 13:50:18,669 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 119 transitions. Word has length 18 [2020-07-20 13:50:18,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:18,670 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 119 transitions. [2020-07-20 13:50:18,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:18,670 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 119 transitions. [2020-07-20 13:50:18,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:50:18,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:18,673 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:18,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,889 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:18,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:18,890 INFO L82 PathProgramCache]: Analyzing trace with hash 185498738, now seen corresponding path program 1 times [2020-07-20 13:50:18,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:18,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035970810] [2020-07-20 13:50:18,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:18,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:18,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:18,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:18,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:18,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:18,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035970810] [2020-07-20 13:50:18,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:18,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:18,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889247663] [2020-07-20 13:50:18,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:18,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:18,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:18,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,959 INFO L87 Difference]: Start difference. First operand 69 states and 119 transitions. Second operand 3 states. [2020-07-20 13:50:18,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:18,985 INFO L93 Difference]: Finished difference Result 106 states and 179 transitions. [2020-07-20 13:50:18,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:18,986 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:50:18,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:18,987 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:50:18,987 INFO L226 Difference]: Without dead ends: 74 [2020-07-20 13:50:18,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:18,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-20 13:50:18,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2020-07-20 13:50:18,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 13:50:18,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 120 transitions. [2020-07-20 13:50:18,998 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 120 transitions. Word has length 18 [2020-07-20 13:50:18,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:18,999 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 120 transitions. [2020-07-20 13:50:18,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:18,999 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 120 transitions. [2020-07-20 13:50:19,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:50:19,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,001 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:19,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,216 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:19,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:19,217 INFO L82 PathProgramCache]: Analyzing trace with hash 886563316, now seen corresponding path program 1 times [2020-07-20 13:50:19,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:19,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831466515] [2020-07-20 13:50:19,219 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:19,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:19,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:19,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:19,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:19,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:19,281 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831466515] [2020-07-20 13:50:19,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:19,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:19,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33317037] [2020-07-20 13:50:19,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:19,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:19,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:19,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,283 INFO L87 Difference]: Start difference. First operand 72 states and 120 transitions. Second operand 3 states. [2020-07-20 13:50:19,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:19,314 INFO L93 Difference]: Finished difference Result 164 states and 278 transitions. [2020-07-20 13:50:19,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:19,318 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:50:19,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:19,319 INFO L225 Difference]: With dead ends: 164 [2020-07-20 13:50:19,319 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 13:50:19,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 13:50:19,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-07-20 13:50:19,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 13:50:19,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 162 transitions. [2020-07-20 13:50:19,340 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 162 transitions. Word has length 18 [2020-07-20 13:50:19,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:19,340 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 162 transitions. [2020-07-20 13:50:19,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:19,341 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 162 transitions. [2020-07-20 13:50:19,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:19,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:19,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,559 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:19,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:19,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1012809135, now seen corresponding path program 1 times [2020-07-20 13:50:19,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:19,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231752031] [2020-07-20 13:50:19,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,597 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:19,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:19,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:19,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:19,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:19,614 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:19,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231752031] [2020-07-20 13:50:19,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:19,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:19,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562501249] [2020-07-20 13:50:19,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:19,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:19,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:19,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,617 INFO L87 Difference]: Start difference. First operand 98 states and 162 transitions. Second operand 3 states. [2020-07-20 13:50:19,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:19,635 INFO L93 Difference]: Finished difference Result 178 states and 298 transitions. [2020-07-20 13:50:19,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:19,636 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:19,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:19,638 INFO L225 Difference]: With dead ends: 178 [2020-07-20 13:50:19,638 INFO L226 Difference]: Without dead ends: 176 [2020-07-20 13:50:19,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2020-07-20 13:50:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 134. [2020-07-20 13:50:19,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 13:50:19,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 220 transitions. [2020-07-20 13:50:19,654 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 220 transitions. Word has length 19 [2020-07-20 13:50:19,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:19,654 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 220 transitions. [2020-07-20 13:50:19,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:19,655 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 220 transitions. [2020-07-20 13:50:19,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:19,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,656 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:19,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,870 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:19,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:19,871 INFO L82 PathProgramCache]: Analyzing trace with hash 619782125, now seen corresponding path program 1 times [2020-07-20 13:50:19,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:19,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27622148] [2020-07-20 13:50:19,873 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:19,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:19,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:19,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:19,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:19,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:19,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27622148] [2020-07-20 13:50:19,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:19,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:19,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677781502] [2020-07-20 13:50:19,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:19,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:19,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:19,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,943 INFO L87 Difference]: Start difference. First operand 134 states and 220 transitions. Second operand 3 states. [2020-07-20 13:50:19,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:19,965 INFO L93 Difference]: Finished difference Result 200 states and 326 transitions. [2020-07-20 13:50:19,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:19,966 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:19,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:19,967 INFO L225 Difference]: With dead ends: 200 [2020-07-20 13:50:19,967 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 13:50:19,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 13:50:19,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-20 13:50:19,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 13:50:19,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 218 transitions. [2020-07-20 13:50:19,987 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 218 transitions. Word has length 19 [2020-07-20 13:50:19,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:19,987 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 218 transitions. [2020-07-20 13:50:19,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:19,987 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 218 transitions. [2020-07-20 13:50:19,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:19,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,989 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,203 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1320846703, now seen corresponding path program 1 times [2020-07-20 13:50:20,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884439678] [2020-07-20 13:50:20,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:20,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,260 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884439678] [2020-07-20 13:50:20,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833206602] [2020-07-20 13:50:20,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,262 INFO L87 Difference]: Start difference. First operand 136 states and 218 transitions. Second operand 3 states. [2020-07-20 13:50:20,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,293 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-20 13:50:20,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,294 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:20,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,296 INFO L225 Difference]: With dead ends: 312 [2020-07-20 13:50:20,296 INFO L226 Difference]: Without dead ends: 186 [2020-07-20 13:50:20,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-20 13:50:20,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-20 13:50:20,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-20 13:50:20,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 290 transitions. [2020-07-20 13:50:20,321 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 290 transitions. Word has length 19 [2020-07-20 13:50:20,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,322 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 290 transitions. [2020-07-20 13:50:20,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,322 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 290 transitions. [2020-07-20 13:50:20,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:20,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,530 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1590692585, now seen corresponding path program 1 times [2020-07-20 13:50:20,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868568537] [2020-07-20 13:50:20,533 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:20,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868568537] [2020-07-20 13:50:20,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796544464] [2020-07-20 13:50:20,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,574 INFO L87 Difference]: Start difference. First operand 184 states and 290 transitions. Second operand 3 states. [2020-07-20 13:50:20,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,602 INFO L93 Difference]: Finished difference Result 328 states and 524 transitions. [2020-07-20 13:50:20,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,603 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:20,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,605 INFO L225 Difference]: With dead ends: 328 [2020-07-20 13:50:20,606 INFO L226 Difference]: Without dead ends: 326 [2020-07-20 13:50:20,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2020-07-20 13:50:20,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 260. [2020-07-20 13:50:20,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 13:50:20,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 402 transitions. [2020-07-20 13:50:20,622 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 402 transitions. Word has length 20 [2020-07-20 13:50:20,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,622 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 402 transitions. [2020-07-20 13:50:20,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,623 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 402 transitions. [2020-07-20 13:50:20,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:20,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,625 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,838 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1197665575, now seen corresponding path program 1 times [2020-07-20 13:50:20,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487931498] [2020-07-20 13:50:20,839 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:20,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487931498] [2020-07-20 13:50:20,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023872493] [2020-07-20 13:50:20,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,896 INFO L87 Difference]: Start difference. First operand 260 states and 402 transitions. Second operand 3 states. [2020-07-20 13:50:20,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,912 INFO L93 Difference]: Finished difference Result 388 states and 596 transitions. [2020-07-20 13:50:20,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,912 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:20,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,914 INFO L225 Difference]: With dead ends: 388 [2020-07-20 13:50:20,915 INFO L226 Difference]: Without dead ends: 266 [2020-07-20 13:50:20,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-20 13:50:20,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 264. [2020-07-20 13:50:20,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-20 13:50:20,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 398 transitions. [2020-07-20 13:50:20,926 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 398 transitions. Word has length 20 [2020-07-20 13:50:20,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,927 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 398 transitions. [2020-07-20 13:50:20,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,927 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 398 transitions. [2020-07-20 13:50:20,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:20,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,928 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,142 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1898730153, now seen corresponding path program 1 times [2020-07-20 13:50:21,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148968433] [2020-07-20 13:50:21,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:21,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,186 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148968433] [2020-07-20 13:50:21,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955584054] [2020-07-20 13:50:21,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,189 INFO L87 Difference]: Start difference. First operand 264 states and 398 transitions. Second operand 3 states. [2020-07-20 13:50:21,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,216 INFO L93 Difference]: Finished difference Result 604 states and 912 transitions. [2020-07-20 13:50:21,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,216 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:21,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,219 INFO L225 Difference]: With dead ends: 604 [2020-07-20 13:50:21,219 INFO L226 Difference]: Without dead ends: 354 [2020-07-20 13:50:21,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-20 13:50:21,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 352. [2020-07-20 13:50:21,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 13:50:21,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 518 transitions. [2020-07-20 13:50:21,241 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 518 transitions. Word has length 20 [2020-07-20 13:50:21,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,241 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 518 transitions. [2020-07-20 13:50:21,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,241 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 518 transitions. [2020-07-20 13:50:21,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:21,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,243 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,450 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1969756604, now seen corresponding path program 1 times [2020-07-20 13:50:21,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697666646] [2020-07-20 13:50:21,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,479 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:21,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697666646] [2020-07-20 13:50:21,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873949204] [2020-07-20 13:50:21,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,490 INFO L87 Difference]: Start difference. First operand 352 states and 518 transitions. Second operand 3 states. [2020-07-20 13:50:21,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,526 INFO L93 Difference]: Finished difference Result 612 states and 912 transitions. [2020-07-20 13:50:21,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,526 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:21,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,530 INFO L225 Difference]: With dead ends: 612 [2020-07-20 13:50:21,531 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 13:50:21,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 13:50:21,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 512. [2020-07-20 13:50:21,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-20 13:50:21,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 734 transitions. [2020-07-20 13:50:21,553 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 734 transitions. Word has length 21 [2020-07-20 13:50:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,555 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 734 transitions. [2020-07-20 13:50:21,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 734 transitions. [2020-07-20 13:50:21,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:21,559 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,559 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,765 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1932183682, now seen corresponding path program 1 times [2020-07-20 13:50:21,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803361873] [2020-07-20 13:50:21,767 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:21,799 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:21,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,813 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803361873] [2020-07-20 13:50:21,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246492127] [2020-07-20 13:50:21,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,815 INFO L87 Difference]: Start difference. First operand 512 states and 734 transitions. Second operand 3 states. [2020-07-20 13:50:21,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,849 INFO L93 Difference]: Finished difference Result 1172 states and 1680 transitions. [2020-07-20 13:50:21,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,850 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:21,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,853 INFO L225 Difference]: With dead ends: 1172 [2020-07-20 13:50:21,853 INFO L226 Difference]: Without dead ends: 674 [2020-07-20 13:50:21,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2020-07-20 13:50:21,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 672. [2020-07-20 13:50:21,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 672 states. [2020-07-20 13:50:21,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 672 states to 672 states and 934 transitions. [2020-07-20 13:50:21,875 INFO L78 Accepts]: Start accepts. Automaton has 672 states and 934 transitions. Word has length 21 [2020-07-20 13:50:21,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,875 INFO L479 AbstractCegarLoop]: Abstraction has 672 states and 934 transitions. [2020-07-20 13:50:21,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,876 INFO L276 IsEmpty]: Start isEmpty. Operand 672 states and 934 transitions. [2020-07-20 13:50:21,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:21,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,091 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,092 INFO L82 PathProgramCache]: Analyzing trace with hash -932696864, now seen corresponding path program 1 times [2020-07-20 13:50:22,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132048815] [2020-07-20 13:50:22,093 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:22,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:22,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,133 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132048815] [2020-07-20 13:50:22,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554340396] [2020-07-20 13:50:22,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,135 INFO L87 Difference]: Start difference. First operand 672 states and 934 transitions. Second operand 3 states. [2020-07-20 13:50:22,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,163 INFO L93 Difference]: Finished difference Result 1140 states and 1592 transitions. [2020-07-20 13:50:22,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,163 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:22,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,169 INFO L225 Difference]: With dead ends: 1140 [2020-07-20 13:50:22,169 INFO L226 Difference]: Without dead ends: 1138 [2020-07-20 13:50:22,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1138 states. [2020-07-20 13:50:22,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1138 to 1008. [2020-07-20 13:50:22,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1008 states. [2020-07-20 13:50:22,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1008 states to 1008 states and 1366 transitions. [2020-07-20 13:50:22,199 INFO L78 Accepts]: Start accepts. Automaton has 1008 states and 1366 transitions. Word has length 22 [2020-07-20 13:50:22,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,199 INFO L479 AbstractCegarLoop]: Abstraction has 1008 states and 1366 transitions. [2020-07-20 13:50:22,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,200 INFO L276 IsEmpty]: Start isEmpty. Operand 1008 states and 1366 transitions. [2020-07-20 13:50:22,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:22,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,202 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,416 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1325723874, now seen corresponding path program 1 times [2020-07-20 13:50:22,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956741846] [2020-07-20 13:50:22,418 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:22,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:22,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956741846] [2020-07-20 13:50:22,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718565799] [2020-07-20 13:50:22,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,457 INFO L87 Difference]: Start difference. First operand 1008 states and 1366 transitions. Second operand 3 states. [2020-07-20 13:50:22,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,495 INFO L93 Difference]: Finished difference Result 2292 states and 3096 transitions. [2020-07-20 13:50:22,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,495 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:22,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,502 INFO L225 Difference]: With dead ends: 2292 [2020-07-20 13:50:22,502 INFO L226 Difference]: Without dead ends: 1298 [2020-07-20 13:50:22,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1298 states. [2020-07-20 13:50:22,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1298 to 1296. [2020-07-20 13:50:22,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1296 states. [2020-07-20 13:50:22,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1296 states to 1296 states and 1686 transitions. [2020-07-20 13:50:22,552 INFO L78 Accepts]: Start accepts. Automaton has 1296 states and 1686 transitions. Word has length 22 [2020-07-20 13:50:22,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,552 INFO L479 AbstractCegarLoop]: Abstraction has 1296 states and 1686 transitions. [2020-07-20 13:50:22,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,553 INFO L276 IsEmpty]: Start isEmpty. Operand 1296 states and 1686 transitions. [2020-07-20 13:50:22,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:22,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,772 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1151384345, now seen corresponding path program 1 times [2020-07-20 13:50:22,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165258736] [2020-07-20 13:50:22,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:22,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:22,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165258736] [2020-07-20 13:50:22,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043003894] [2020-07-20 13:50:22,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,825 INFO L87 Difference]: Start difference. First operand 1296 states and 1686 transitions. Second operand 3 states. [2020-07-20 13:50:22,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,870 INFO L93 Difference]: Finished difference Result 2130 states and 2743 transitions. [2020-07-20 13:50:22,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,870 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:22,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,880 INFO L225 Difference]: With dead ends: 2130 [2020-07-20 13:50:22,880 INFO L226 Difference]: Without dead ends: 2128 [2020-07-20 13:50:22,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2128 states. [2020-07-20 13:50:22,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2128 to 2000. [2020-07-20 13:50:22,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2000 states. [2020-07-20 13:50:22,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2000 states to 2000 states and 2550 transitions. [2020-07-20 13:50:22,953 INFO L78 Accepts]: Start accepts. Automaton has 2000 states and 2550 transitions. Word has length 23 [2020-07-20 13:50:22,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,954 INFO L479 AbstractCegarLoop]: Abstraction has 2000 states and 2550 transitions. [2020-07-20 13:50:22,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,954 INFO L276 IsEmpty]: Start isEmpty. Operand 2000 states and 2550 transitions. [2020-07-20 13:50:22,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:22,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,960 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,175 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,175 INFO L82 PathProgramCache]: Analyzing trace with hash 758357335, now seen corresponding path program 1 times [2020-07-20 13:50:23,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132907700] [2020-07-20 13:50:23,176 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:23,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:23,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,255 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132907700] [2020-07-20 13:50:23,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49489995] [2020-07-20 13:50:23,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,260 INFO L87 Difference]: Start difference. First operand 2000 states and 2550 transitions. Second operand 3 states. [2020-07-20 13:50:23,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,359 INFO L93 Difference]: Finished difference Result 4496 states and 5686 transitions. [2020-07-20 13:50:23,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,360 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:23,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,360 INFO L225 Difference]: With dead ends: 4496 [2020-07-20 13:50:23,361 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:50:23,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:50:23,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:50:23,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:50:23,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:50:23,374 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-07-20 13:50:23,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,375 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:50:23,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,375 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:50:23,375 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:50:23,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,591 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:50:23,658 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:50:23,658 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:23,658 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:23,658 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:50:23,658 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:50:23,658 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 121) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L268 CegarLoopResult]: For program point L102(line 102) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L268 CegarLoopResult]: For program point L86-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L271 CegarLoopResult]: At program point L111-1(lines 30 116) the Hoare annotation is: true [2020-07-20 13:50:23,659 INFO L268 CegarLoopResult]: For program point L87(line 87) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L268 CegarLoopResult]: For program point L112(line 112) no Hoare annotation was computed. [2020-07-20 13:50:23,659 INFO L264 CegarLoopResult]: At program point L112-1(lines 5 121) the Hoare annotation is: false [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 121) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point L71-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 119) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point L96-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point L63-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 121) the Hoare annotation is: true [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point L55-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,660 INFO L268 CegarLoopResult]: For program point L97(line 97) no Hoare annotation was computed. [2020-07-20 13:50:23,661 INFO L268 CegarLoopResult]: For program point L81-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,661 INFO L268 CegarLoopResult]: For program point L106-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,661 INFO L268 CegarLoopResult]: For program point L32(lines 32 34) no Hoare annotation was computed. [2020-07-20 13:50:23,661 INFO L268 CegarLoopResult]: For program point L82(line 82) no Hoare annotation was computed. [2020-07-20 13:50:23,662 INFO L268 CegarLoopResult]: For program point L107(line 107) no Hoare annotation was computed. [2020-07-20 13:50:23,662 INFO L268 CegarLoopResult]: For program point L91-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,662 INFO L268 CegarLoopResult]: For program point L75-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,662 INFO L268 CegarLoopResult]: For program point L67-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,662 INFO L268 CegarLoopResult]: For program point L92(line 92) no Hoare annotation was computed. [2020-07-20 13:50:23,663 INFO L268 CegarLoopResult]: For program point L59-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,663 INFO L271 CegarLoopResult]: At program point L117(lines 5 121) the Hoare annotation is: true [2020-07-20 13:50:23,663 INFO L268 CegarLoopResult]: For program point L51(lines 51 53) no Hoare annotation was computed. [2020-07-20 13:50:23,663 INFO L268 CegarLoopResult]: For program point L51-2(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,663 INFO L268 CegarLoopResult]: For program point L101-1(lines 30 116) no Hoare annotation was computed. [2020-07-20 13:50:23,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:50:23 BoogieIcfgContainer [2020-07-20 13:50:23,676 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:50:23,679 INFO L168 Benchmark]: Toolchain (without parser) took 6956.72 ms. Allocated memory was 139.5 MB in the beginning and 244.8 MB in the end (delta: 105.4 MB). Free memory was 103.7 MB in the beginning and 194.7 MB in the end (delta: -91.0 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,680 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,681 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.67 ms. Allocated memory is still 139.5 MB. Free memory was 103.5 MB in the beginning and 93.2 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,682 INFO L168 Benchmark]: Boogie Preprocessor took 35.58 ms. Allocated memory is still 139.5 MB. Free memory was 93.2 MB in the beginning and 91.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,682 INFO L168 Benchmark]: RCFGBuilder took 442.45 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 91.6 MB in the beginning and 164.0 MB in the end (delta: -72.4 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,686 INFO L168 Benchmark]: TraceAbstraction took 6228.32 ms. Allocated memory was 201.9 MB in the beginning and 244.8 MB in the end (delta: 43.0 MB). Free memory was 164.0 MB in the beginning and 194.7 MB in the end (delta: -30.8 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:23,694 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.67 ms. Allocated memory is still 139.5 MB. Free memory was 103.5 MB in the beginning and 93.2 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.58 ms. Allocated memory is still 139.5 MB. Free memory was 93.2 MB in the beginning and 91.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 442.45 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 91.6 MB in the beginning and 164.0 MB in the end (delta: -72.4 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6228.32 ms. Allocated memory was 201.9 MB in the beginning and 244.8 MB in the end (delta: 43.0 MB). Free memory was 164.0 MB in the beginning and 194.7 MB in the end (delta: -30.8 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 119]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.0s, OverallIterations: 17, TraceHistogramMax: 1, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1049 SDtfs, 481 SDslu, 712 SDs, 0 SdLazy, 92 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 320 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2000occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 17 MinimizatonAttempts, 524 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 138 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 337 NumberOfCodeBlocks, 276 NumberOfCodeBlocksAsserted, 54 NumberOfCheckSat, 320 ConstructedInterpolants, 0 QuantifiedInterpolants, 11208 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1316 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 17 InterpolantComputations, 17 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...