/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:02:30,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:02:30,359 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:02:30,373 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:02:30,374 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:02:30,375 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:02:30,376 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:02:30,378 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:02:30,379 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:02:30,380 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:02:30,381 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:02:30,382 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:02:30,382 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:02:30,383 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:02:30,384 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:02:30,386 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:02:30,386 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:02:30,387 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:02:30,389 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:02:30,391 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:02:30,393 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:02:30,394 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:02:30,395 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:02:30,396 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:02:30,399 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:02:30,399 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:02:30,400 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:02:30,400 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:02:30,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:02:30,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:02:30,402 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:02:30,403 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:02:30,404 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:02:30,404 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:02:30,405 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:02:30,406 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:02:30,406 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:02:30,407 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:02:30,407 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:02:30,408 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:02:30,408 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:02:30,409 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:02:30,424 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:02:30,424 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:02:30,425 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:02:30,425 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:02:30,425 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:02:30,426 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:02:30,426 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:02:30,426 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:02:30,426 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:02:30,426 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:02:30,427 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:02:30,427 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:02:30,427 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:02:30,427 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:02:30,427 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:02:30,428 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:02:30,428 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:02:30,428 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:02:30,428 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:02:30,428 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:02:30,429 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:02:30,429 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:30,429 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:02:30,429 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:02:30,429 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:02:30,430 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:02:30,430 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:30,430 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:02:30,430 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:02:30,430 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:02:30,689 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:02:30,701 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:02:30,704 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:02:30,706 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:02:30,706 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:02:30,707 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 22:02:30,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f35c061c4/750fc4a271cf4894b053f330a0cfc814/FLAG4ec577bf1 [2020-07-21 22:02:31,212 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:02:31,212 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 22:02:31,222 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f35c061c4/750fc4a271cf4894b053f330a0cfc814/FLAG4ec577bf1 [2020-07-21 22:02:31,548 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f35c061c4/750fc4a271cf4894b053f330a0cfc814 [2020-07-21 22:02:31,559 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:02:31,563 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:02:31,564 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:31,564 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:02:31,568 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:02:31,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,573 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62e714be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31, skipping insertion in model container [2020-07-21 22:02:31,573 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,581 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:02:31,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:02:31,781 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:31,788 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:02:31,804 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:31,819 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:02:31,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31 WrapperNode [2020-07-21 22:02:31,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:31,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:02:31,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:02:31,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:02:31,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,833 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,924 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,928 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,929 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... [2020-07-21 22:02:31,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:02:31,931 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:02:31,931 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:02:31,931 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:02:31,932 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:31,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:02:31,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:02:31,997 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 22:02:31,998 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-21 22:02:31,998 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:02:31,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:02:31,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:02:31,998 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 22:02:31,998 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-21 22:02:31,999 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:02:31,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:02:31,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:02:32,236 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:02:32,237 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 22:02:32,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:32 BoogieIcfgContainer [2020-07-21 22:02:32,243 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:02:32,256 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:02:32,258 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:02:32,265 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:02:32,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:02:31" (1/3) ... [2020-07-21 22:02:32,270 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a90f60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:32, skipping insertion in model container [2020-07-21 22:02:32,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:31" (2/3) ... [2020-07-21 22:02:32,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a90f60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:32, skipping insertion in model container [2020-07-21 22:02:32,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:32" (3/3) ... [2020-07-21 22:02:32,276 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-21 22:02:32,287 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:02:32,295 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:02:32,312 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:02:32,348 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:02:32,348 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:02:32,348 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:02:32,349 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:02:32,349 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:02:32,349 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:02:32,349 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:02:32,349 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:02:32,366 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-21 22:02:32,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 22:02:32,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:32,374 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:32,374 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:32,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:32,379 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-21 22:02:32,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:32,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511700828] [2020-07-21 22:02:32,387 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 [2020-07-21 22:02:32,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:32,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:32,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:32,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:32,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:32,557 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:32,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511700828] [2020-07-21 22:02:32,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:32,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:32,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769053503] [2020-07-21 22:02:32,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:32,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:32,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:32,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:32,581 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-21 22:02:32,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:32,696 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-21 22:02:32,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:32,698 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 22:02:32,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:32,709 INFO L225 Difference]: With dead ends: 60 [2020-07-21 22:02:32,710 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:02:32,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:32,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:02:32,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 22:02:32,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 22:02:32,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-21 22:02:32,757 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-21 22:02:32,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:32,758 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-21 22:02:32,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-21 22:02:32,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 22:02:32,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:32,761 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:32,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:32,976 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:32,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:32,977 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-21 22:02:32,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:32,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248826604] [2020-07-21 22:02:32,979 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 [2020-07-21 22:02:33,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:33,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:33,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:33,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:33,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:33,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:33,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248826604] [2020-07-21 22:02:33,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:33,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:33,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502114825] [2020-07-21 22:02:33,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:33,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:33,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:33,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:33,051 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-21 22:02:33,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:33,114 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-21 22:02:33,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:33,115 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 22:02:33,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:33,117 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:02:33,117 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:02:33,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:33,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:02:33,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 22:02:33,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 22:02:33,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-21 22:02:33,126 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-21 22:02:33,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:33,127 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-21 22:02:33,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:33,127 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-21 22:02:33,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:02:33,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:33,129 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:33,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:33,344 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:33,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:33,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-21 22:02:33,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:33,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301052334] [2020-07-21 22:02:33,348 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 [2020-07-21 22:02:33,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:33,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:33,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:33,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:33,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:33,434 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:33,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301052334] [2020-07-21 22:02:33,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:33,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:33,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054018856] [2020-07-21 22:02:33,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:33,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:33,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:33,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:33,437 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-21 22:02:33,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:33,509 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-21 22:02:33,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:33,511 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 22:02:33,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:33,512 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:02:33,512 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:02:33,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:33,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:02:33,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 22:02:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 22:02:33,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-21 22:02:33,525 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-21 22:02:33,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:33,527 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-21 22:02:33,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:33,527 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-21 22:02:33,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:02:33,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:33,528 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:33,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:33,744 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:33,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:33,745 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-21 22:02:33,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:33,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526737352] [2020-07-21 22:02:33,747 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 [2020-07-21 22:02:33,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:33,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:33,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:02:33,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:33,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:33,810 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:33,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526737352] [2020-07-21 22:02:33,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:33,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:02:33,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219097043] [2020-07-21 22:02:33,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:33,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:33,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:33,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:02:33,813 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-21 22:02:33,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:33,863 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 22:02:33,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:33,863 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 22:02:33,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:33,865 INFO L225 Difference]: With dead ends: 40 [2020-07-21 22:02:33,865 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 22:02:33,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:33,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 22:02:33,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 22:02:33,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 22:02:33,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 22:02:33,873 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-21 22:02:33,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:33,873 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 22:02:33,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:33,874 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 22:02:33,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 22:02:33,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:33,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:34,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:34,089 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:34,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:34,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-21 22:02:34,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:34,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745014708] [2020-07-21 22:02:34,092 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 [2020-07-21 22:02:34,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:34,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:34,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:02:34,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:34,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:34,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:34,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:34,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745014708] [2020-07-21 22:02:34,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:02:34,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2020-07-21 22:02:34,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090944880] [2020-07-21 22:02:34,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:02:34,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:34,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:02:34,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 22:02:34,262 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-07-21 22:02:34,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:34,308 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 22:02:34,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:02:34,308 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-07-21 22:02:34,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:34,309 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:02:34,310 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 22:02:34,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 22:02:34,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 22:02:34,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 22:02:34,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 22:02:34,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 22:02:34,316 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-21 22:02:34,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:34,317 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 22:02:34,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:02:34,317 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 22:02:34,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 22:02:34,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:34,318 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:34,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:34,523 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:34,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:34,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-21 22:02:34,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:34,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439749787] [2020-07-21 22:02:34,525 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 [2020-07-21 22:02:34,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:34,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:34,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 22:02:34,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:34,739 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:34,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:34,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439749787] [2020-07-21 22:02:34,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:02:34,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 22:02:34,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848599411] [2020-07-21 22:02:34,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 22:02:34,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:34,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 22:02:34,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 22:02:34,907 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-07-21 22:02:37,050 WARN L193 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 22:02:37,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:37,116 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2020-07-21 22:02:37,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:02:37,117 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-07-21 22:02:37,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:37,118 INFO L225 Difference]: With dead ends: 48 [2020-07-21 22:02:37,118 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 22:02:37,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:02:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 22:02:37,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 22:02:37,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:02:37,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-21 22:02:37,126 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-21 22:02:37,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:37,126 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-21 22:02:37,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 22:02:37,126 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-21 22:02:37,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:02:37,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:37,127 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:37,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:37,336 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:37,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:37,337 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-21 22:02:37,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:37,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019659520] [2020-07-21 22:02:37,339 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 [2020-07-21 22:02:37,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:37,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:37,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:02:37,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:37,510 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:37,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:37,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019659520] [2020-07-21 22:02:37,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:02:37,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-21 22:02:37,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652942564] [2020-07-21 22:02:37,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 22:02:37,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:37,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 22:02:37,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:02:37,630 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-07-21 22:02:37,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:37,839 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-07-21 22:02:37,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:02:37,842 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-21 22:02:37,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:37,843 INFO L225 Difference]: With dead ends: 50 [2020-07-21 22:02:37,843 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:02:37,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:02:37,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:02:37,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 22:02:37,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 22:02:37,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-21 22:02:37,856 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-21 22:02:37,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:37,856 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-21 22:02:37,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 22:02:37,857 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-21 22:02:37,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:02:37,857 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:37,857 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:38,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:38,059 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:38,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:38,060 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-21 22:02:38,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:38,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199310052] [2020-07-21 22:02:38,061 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 [2020-07-21 22:02:38,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:38,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:38,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:02:38,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:02:38,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:38,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199310052] [2020-07-21 22:02:38,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:02:38,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 22:02:38,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145767708] [2020-07-21 22:02:38,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:02:38,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:38,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:02:38,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:02:38,344 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-21 22:02:38,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:38,525 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-21 22:02:38,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:02:38,528 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:02:38,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:38,529 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:02:38,529 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 22:02:38,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:02:38,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 22:02:38,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 22:02:38,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:02:38,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 22:02:38,536 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-21 22:02:38,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:38,537 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 22:02:38,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:02:38,537 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 22:02:38,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 22:02:38,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:38,538 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:38,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:38,740 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:38,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:38,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-21 22:02:38,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:38,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108865944] [2020-07-21 22:02:38,742 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 [2020-07-21 22:02:38,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:38,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:38,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 22:02:38,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:38,911 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:02:38,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:38,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:38,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:41,153 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:02:41,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108865944] [2020-07-21 22:02:41,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:41,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2020-07-21 22:02:41,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138570980] [2020-07-21 22:02:41,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:02:41,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:41,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:02:41,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:02:41,156 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 20 states. [2020-07-21 22:02:48,708 WARN L193 SmtUtils]: Spent 3.81 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 22:02:58,313 WARN L193 SmtUtils]: Spent 7.87 s on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 22:02:59,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:59,766 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 22:02:59,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:02:59,769 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2020-07-21 22:02:59,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:59,770 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:02:59,771 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 22:02:59,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:02:59,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 22:02:59,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 22:02:59,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 22:02:59,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2020-07-21 22:02:59,780 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 29 [2020-07-21 22:02:59,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:59,780 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2020-07-21 22:02:59,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:02:59,780 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2020-07-21 22:02:59,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:02:59,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:59,782 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:59,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:59,995 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:59,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:59,996 INFO L82 PathProgramCache]: Analyzing trace with hash 841482334, now seen corresponding path program 5 times [2020-07-21 22:02:59,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:59,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478141098] [2020-07-21 22:02:59,997 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 [2020-07-21 22:03:00,024 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:03:00,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:00,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:03:00,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:00,359 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:03:00,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:00,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478141098] [2020-07-21 22:03:00,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:03:00,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 22:03:00,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338858385] [2020-07-21 22:03:00,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:03:00,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:00,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:03:00,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:03:00,542 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 9 states. [2020-07-21 22:03:10,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:10,986 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-21 22:03:10,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:03:10,997 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-07-21 22:03:10,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:10,998 INFO L225 Difference]: With dead ends: 54 [2020-07-21 22:03:10,998 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 22:03:10,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2020-07-21 22:03:10,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 22:03:11,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 22:03:11,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 22:03:11,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-07-21 22:03:11,004 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2020-07-21 22:03:11,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:11,004 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-07-21 22:03:11,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:03:11,005 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-07-21 22:03:11,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:03:11,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:11,007 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:11,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:11,210 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:11,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:11,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 6 times [2020-07-21 22:03:11,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:11,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380054405] [2020-07-21 22:03:11,212 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 [2020-07-21 22:03:11,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:03:11,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:11,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 22:03:11,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:11,249 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-21 22:03:11,249 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:03:11,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380054405] [2020-07-21 22:03:11,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:03:11,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:03:11,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820036344] [2020-07-21 22:03:11,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:03:11,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:11,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:03:11,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:03:11,251 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 3 states. [2020-07-21 22:03:11,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:11,269 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-21 22:03:11,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:03:11,273 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 22:03:11,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:11,273 INFO L225 Difference]: With dead ends: 51 [2020-07-21 22:03:11,274 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:03:11,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:03:11,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:03:11,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 22:03:11,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 22:03:11,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 22:03:11,280 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2020-07-21 22:03:11,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:11,280 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 22:03:11,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:03:11,280 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 22:03:11,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 22:03:11,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:11,281 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:11,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:11,494 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:11,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:11,495 INFO L82 PathProgramCache]: Analyzing trace with hash -202245895, now seen corresponding path program 7 times [2020-07-21 22:03:11,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:11,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70935605] [2020-07-21 22:03:11,496 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 [2020-07-21 22:03:11,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:03:11,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:11,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:03:11,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:12,180 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:03:12,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:12,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70935605] [2020-07-21 22:03:12,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:03:12,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 22:03:12,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4128335] [2020-07-21 22:03:12,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:03:12,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:12,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:03:12,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:03:12,688 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 12 states. [2020-07-21 22:03:19,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:19,231 INFO L93 Difference]: Finished difference Result 63 states and 75 transitions. [2020-07-21 22:03:19,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:03:19,235 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-07-21 22:03:19,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:19,236 INFO L225 Difference]: With dead ends: 63 [2020-07-21 22:03:19,237 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 22:03:19,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=50, Invalid=255, Unknown=1, NotChecked=0, Total=306 [2020-07-21 22:03:19,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 22:03:19,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-07-21 22:03:19,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:03:19,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2020-07-21 22:03:19,243 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 33 [2020-07-21 22:03:19,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:19,243 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2020-07-21 22:03:19,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:03:19,244 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2020-07-21 22:03:19,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 22:03:19,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:19,245 INFO L422 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:19,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:19,453 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:19,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:19,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1486576746, now seen corresponding path program 8 times [2020-07-21 22:03:19,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:19,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746507426] [2020-07-21 22:03:19,455 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 [2020-07-21 22:03:19,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:03:19,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:19,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 22:03:19,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:24,198 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_103 Int)) (and (<= (div (+ v_gcd_test_~a_103 (* |c_gcd_test_#in~a| (- 1))) (- 3)) |c_gcd_test_#in~b|) (<= (+ (* 2 v_gcd_test_~a_103) (div (+ (* v_gcd_test_~a_103 (- 1)) (* c_gcd_test_~b (- 1))) (- 3))) |c_gcd_test_#in~b|))) is different from true [2020-07-21 22:03:24,402 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 8 not checked. [2020-07-21 22:03:24,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:25,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746507426] [2020-07-21 22:03:25,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:03:25,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-21 22:03:25,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127305141] [2020-07-21 22:03:25,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:03:25,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:25,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:03:25,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=132, Unknown=2, NotChecked=22, Total=182 [2020-07-21 22:03:25,034 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 13 states. [2020-07-21 22:03:35,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:35,190 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2020-07-21 22:03:35,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:03:35,193 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-07-21 22:03:35,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:35,194 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:03:35,195 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:03:35,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=54, Invalid=254, Unknown=2, NotChecked=32, Total=342 [2020-07-21 22:03:35,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:03:35,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-07-21 22:03:35,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 22:03:35,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2020-07-21 22:03:35,202 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 35 [2020-07-21 22:03:35,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:35,202 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2020-07-21 22:03:35,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:03:35,202 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2020-07-21 22:03:35,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 22:03:35,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:35,203 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:35,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:35,418 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:35,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:35,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1222056691, now seen corresponding path program 9 times [2020-07-21 22:03:35,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:35,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862581527] [2020-07-21 22:03:35,420 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 [2020-07-21 22:03:35,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:03:35,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:35,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:03:35,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:42,078 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:03:42,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:42,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862581527] [2020-07-21 22:03:42,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:03:42,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 22:03:42,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730036865] [2020-07-21 22:03:42,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:03:42,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:42,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:03:42,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=180, Unknown=2, NotChecked=0, Total=210 [2020-07-21 22:03:42,754 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 14 states. [2020-07-21 22:03:53,247 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2020-07-21 22:03:55,755 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 26 [2020-07-21 22:04:07,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:04:07,729 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2020-07-21 22:04:07,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:04:07,737 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-21 22:04:07,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:04:07,739 INFO L225 Difference]: With dead ends: 65 [2020-07-21 22:04:07,739 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 22:04:07,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=68, Invalid=391, Unknown=3, NotChecked=0, Total=462 [2020-07-21 22:04:07,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 22:04:07,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-07-21 22:04:07,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 22:04:07,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 22:04:07,747 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2020-07-21 22:04:07,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:04:07,748 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 22:04:07,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:04:07,748 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 22:04:07,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 22:04:07,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:04:07,749 INFO L422 BasicCegarLoop]: trace histogram [9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:04:07,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:04:07,964 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:04:07,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:04:07,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1480222129, now seen corresponding path program 10 times [2020-07-21 22:04:07,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:04:07,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232980918] [2020-07-21 22:04:07,966 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 [2020-07-21 22:04:08,026 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:04:08,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:04:08,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:04:08,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:04:29,656 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:04:29,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:04:30,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232980918] [2020-07-21 22:04:30,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:04:30,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 22:04:30,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138480662] [2020-07-21 22:04:30,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:04:30,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:04:30,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:04:30,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=122, Unknown=10, NotChecked=0, Total=156 [2020-07-21 22:04:30,526 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 12 states. [2020-07-21 22:05:00,223 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2020-07-21 22:05:17,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:17,256 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2020-07-21 22:05:17,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:05:17,288 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2020-07-21 22:05:17,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:17,289 INFO L225 Difference]: With dead ends: 60 [2020-07-21 22:05:17,289 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 22:05:17,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 35.1s TimeCoverageRelationStatistics Valid=52, Invalid=238, Unknown=16, NotChecked=0, Total=306 [2020-07-21 22:05:17,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 22:05:17,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 22:05:17,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 22:05:17,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2020-07-21 22:05:17,299 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 37 [2020-07-21 22:05:17,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:17,299 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2020-07-21 22:05:17,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:05:17,300 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2020-07-21 22:05:17,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:05:17,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:17,301 INFO L422 BasicCegarLoop]: trace histogram [10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:17,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:17,511 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:17,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:17,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1468608272, now seen corresponding path program 11 times [2020-07-21 22:05:17,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:17,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365288876] [2020-07-21 22:05:17,513 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 [2020-07-21 22:05:17,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:05:17,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:17,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:05:17,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:20,682 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:05:20,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:20,997 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 22:05:21,111 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 22:05:21,225 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 22:05:21,514 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 22:05:21,684 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 22:05:22,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365288876] [2020-07-21 22:05:22,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 22:05:22,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 22:05:22,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107962853] [2020-07-21 22:05:22,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:05:22,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:22,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:05:22,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:05:22,142 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 14 states. [2020-07-21 22:05:31,317 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-07-21 22:05:34,178 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2020-07-21 22:05:36,865 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2020-07-21 22:05:39,395 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 22:05:46,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:46,575 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2020-07-21 22:05:46,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:05:46,591 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-07-21 22:05:46,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:46,593 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:05:46,593 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 22:05:46,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=74, Invalid=387, Unknown=1, NotChecked=0, Total=462 [2020-07-21 22:05:46,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 22:05:46,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-21 22:05:46,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:05:46,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2020-07-21 22:05:46,600 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 39 [2020-07-21 22:05:46,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:46,600 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2020-07-21 22:05:46,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:05:46,600 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2020-07-21 22:05:46,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:05:46,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:05:46,602 INFO L422 BasicCegarLoop]: trace histogram [11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:05:46,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:46,807 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:05:46,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:05:46,808 INFO L82 PathProgramCache]: Analyzing trace with hash -2113490963, now seen corresponding path program 12 times [2020-07-21 22:05:46,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:05:46,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839544130] [2020-07-21 22:05:46,809 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 [2020-07-21 22:05:46,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:05:46,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:05:46,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 22:05:46,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:05:47,572 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-07-21 22:05:47,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:05:47,675 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 22:05:49,055 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 25 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-07-21 22:05:49,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839544130] [2020-07-21 22:05:49,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:05:49,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-07-21 22:05:49,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625985425] [2020-07-21 22:05:49,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:05:49,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:05:49,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:05:49,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:05:49,057 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 17 states. [2020-07-21 22:05:50,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:05:50,154 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-07-21 22:05:50,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:05:50,162 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-07-21 22:05:50,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:05:50,162 INFO L225 Difference]: With dead ends: 48 [2020-07-21 22:05:50,163 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:05:50,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:05:50,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:05:50,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:05:50,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:05:50,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:05:50,165 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 41 [2020-07-21 22:05:50,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:05:50,165 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:05:50,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:05:50,165 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:05:50,165 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:05:50,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:05:50,369 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:05:50,984 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 7 [2020-07-21 22:05:51,294 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 22:05:51,595 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 22:05:51,886 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 11 [2020-07-21 22:06:42,699 WARN L193 SmtUtils]: Spent 50.81 s on a formula simplification. DAG size of input: 196 DAG size of output: 59 [2020-07-21 22:06:42,707 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:06:42,707 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:06:42,707 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:06:42,707 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:06:42,707 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:06:42,708 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:06:42,708 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 30 46) the Hoare annotation is: true [2020-07-21 22:06:42,708 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 30 46) no Hoare annotation was computed. [2020-07-21 22:06:42,708 INFO L268 CegarLoopResult]: For program point L43(line 43) no Hoare annotation was computed. [2020-07-21 22:06:42,708 INFO L264 CegarLoopResult]: At program point L42(line 42) the Hoare annotation is: (and (= 18 main_~y~0) (= (+ main_~g~0 54) main_~x~0) (= 63 main_~x~0)) [2020-07-21 22:06:42,708 INFO L264 CegarLoopResult]: At program point L41(line 41) the Hoare annotation is: (and (= 18 main_~y~0) (= (+ main_~g~0 54) main_~x~0) (= 63 main_~x~0)) [2020-07-21 22:06:42,708 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 30 46) no Hoare annotation was computed. [2020-07-21 22:06:42,708 INFO L264 CegarLoopResult]: At program point L41-1(line 41) the Hoare annotation is: (and (= 18 main_~y~0) (= (+ main_~g~0 54) main_~x~0) (= 63 main_~x~0)) [2020-07-21 22:06:42,708 INFO L264 CegarLoopResult]: At program point L39(line 39) the Hoare annotation is: (and (= 18 main_~y~0) (= 63 main_~x~0)) [2020-07-21 22:06:42,709 INFO L268 CegarLoopResult]: For program point L39-1(line 39) no Hoare annotation was computed. [2020-07-21 22:06:42,709 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 4 9) the Hoare annotation is: true [2020-07-21 22:06:42,709 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 4 9) no Hoare annotation was computed. [2020-07-21 22:06:42,709 INFO L268 CegarLoopResult]: For program point L6(line 6) no Hoare annotation was computed. [2020-07-21 22:06:42,709 INFO L268 CegarLoopResult]: For program point L5(lines 5 7) no Hoare annotation was computed. [2020-07-21 22:06:42,709 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 6) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 9) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point gcd_testEXIT(lines 10 27) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point L19-2(lines 19 25) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point L13-1(lines 11 27) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L271 CegarLoopResult]: At program point gcd_testENTRY(lines 10 27) the Hoare annotation is: true [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 22:06:42,710 INFO L264 CegarLoopResult]: At program point L20-2(lines 19 25) the Hoare annotation is: (let ((.cse2 (= gcd_test_~b |gcd_test_#in~b|)) (.cse1 (+ gcd_test_~b gcd_test_~a)) (.cse4 (* |gcd_test_#in~b| 7)) (.cse3 (* |gcd_test_#in~a| 2)) (.cse0 (<= (div (+ gcd_test_~a (* |gcd_test_#in~a| (- 1))) (- 3)) |gcd_test_#in~b|))) (or (and (<= |gcd_test_#in~b| (div (+ (* gcd_test_~a (- 1)) |gcd_test_#in~a|) 3)) .cse0 (= .cse1 |gcd_test_#in~b|)) (and .cse2 (= 0 (mod |gcd_test_#in~a| gcd_test_~a)) (<= |gcd_test_#in~a| gcd_test_~a)) (not (= .cse3 .cse4)) (exists ((gcd_test_~a Int)) (and (<= gcd_test_~a |gcd_test_#in~b|) (<= (div (+ gcd_test_~a (* |gcd_test_#in~a| (- 1))) (- 2)) |gcd_test_#in~b|))) (and (= |gcd_test_#in~a| (+ gcd_test_~a (* |gcd_test_#in~b| 3))) (<= (+ (* 3 gcd_test_~b) gcd_test_~a) |gcd_test_#in~a|) (<= |gcd_test_#in~b| gcd_test_~b)) (let ((.cse5 (+ (* 2 gcd_test_~b) gcd_test_~a))) (and .cse2 (<= .cse5 |gcd_test_#in~a|) (<= |gcd_test_#in~a| .cse5))) (and .cse2 (<= |gcd_test_#in~a| .cse1) (<= .cse1 |gcd_test_#in~a|)) (and (= .cse4 (+ gcd_test_~b .cse3)) (<= (+ gcd_test_~b (* 2 gcd_test_~a)) |gcd_test_#in~b|) .cse0))) [2020-07-21 22:06:42,710 INFO L268 CegarLoopResult]: For program point L12(line 12) no Hoare annotation was computed. [2020-07-21 22:06:42,711 INFO L268 CegarLoopResult]: For program point L12-2(lines 11 27) no Hoare annotation was computed. [2020-07-21 22:06:42,711 INFO L268 CegarLoopResult]: For program point gcd_testFINAL(lines 10 27) no Hoare annotation was computed. [2020-07-21 22:06:42,721 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,722 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,742 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,742 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:06:42 BoogieIcfgContainer [2020-07-21 22:06:42,752 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:06:42,754 INFO L168 Benchmark]: Toolchain (without parser) took 251193.61 ms. Allocated memory was 138.9 MB in the beginning and 263.7 MB in the end (delta: 124.8 MB). Free memory was 102.6 MB in the beginning and 105.8 MB in the end (delta: -3.2 MB). Peak memory consumption was 121.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,755 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,755 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.39 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,760 INFO L168 Benchmark]: Boogie Preprocessor took 110.76 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 92.3 MB in the beginning and 182.1 MB in the end (delta: -89.8 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,760 INFO L168 Benchmark]: RCFGBuilder took 323.18 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 168.9 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,761 INFO L168 Benchmark]: TraceAbstraction took 250496.67 ms. Allocated memory was 203.4 MB in the beginning and 263.7 MB in the end (delta: 60.3 MB). Free memory was 168.2 MB in the beginning and 105.8 MB in the end (delta: 62.5 MB). Peak memory consumption was 122.7 MB. Max. memory is 7.1 GB. [2020-07-21 22:06:42,770 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 255.39 ms. Allocated memory is still 138.9 MB. Free memory was 102.2 MB in the beginning and 92.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.76 ms. Allocated memory was 138.9 MB in the beginning and 203.4 MB in the end (delta: 64.5 MB). Free memory was 92.3 MB in the beginning and 182.1 MB in the end (delta: -89.8 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 323.18 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 168.9 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 250496.67 ms. Allocated memory was 203.4 MB in the beginning and 263.7 MB in the end (delta: 60.3 MB). Free memory was 168.2 MB in the beginning and 105.8 MB in the end (delta: 62.5 MB). Peak memory consumption was 122.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] - GenericResult: Unfinished Backtranslation Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 6]: 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: 19]: Loop Invariant [2020-07-21 22:06:42,778 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,778 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,779 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] [2020-07-21 22:06:42,779 WARN L417 cessorBacktranslator]: Identifier is quantified, using identity as back-translation of IdentifierExpression[gcd_test_~a,QUANTIFIED] Derived loop invariant: ((((((((\old(b) <= (a * -1 + \old(a)) / 3 && (a + \old(a) * -1) / -3 <= \old(b)) && b + a == \old(b)) || ((b == \old(b) && 0 == \old(a) % a) && \old(a) <= a)) || !(\old(a) * 2 == \old(b) * 7)) || (\exists gcd_test_~a : int :: gcd_test_~a <= \old(b) && (gcd_test_~a + \old(a) * -1) / -2 <= \old(b))) || ((\old(a) == a + \old(b) * 3 && 3 * b + a <= \old(a)) && \old(b) <= b)) || ((b == \old(b) && 2 * b + a <= \old(a)) && \old(a) <= 2 * b + a)) || ((b == \old(b) && \old(a) <= b + a) && b + a <= \old(a))) || ((\old(b) * 7 == b + \old(a) * 2 && b + 2 * a <= \old(b)) && (a + \old(a) * -1) / -3 <= \old(b)) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 30 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 198.0s, OverallIterations: 17, TraceHistogramMax: 11, AutomataDifference: 146.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 52.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 377 SDtfs, 196 SDslu, 2075 SDs, 0 SdLazy, 1895 SolverSat, 78 SolverUnsat, 43 SolverUnknown, 0 SolverNotchecked, 96.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 657 GetRequests, 463 SyntacticMatches, 6 SemanticMatches, 188 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 87.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred 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: 0.1s AutomataMinimizationTime, 17 MinimizatonAttempts, 18 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 61 PreInvPairs, 101 NumberOfFragments, 184 HoareAnnotationTreeSize, 61 FomulaSimplifications, 1644 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 11 FomulaSimplificationsInter, 525 FormulaSimplificationTreeSizeReductionInter, 51.9s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 47.4s InterpolantComputationTime, 481 NumberOfCodeBlocks, 360 NumberOfCodeBlocksAsserted, 47 NumberOfCheckSat, 552 ConstructedInterpolants, 62 QuantifiedInterpolants, 135222 SizeOfPredicates, 51 NumberOfNonLiveVariables, 854 ConjunctsInSsa, 192 ConjunctsInUnsatCore, 20 InterpolantComputations, 6 PerfectInterpolantSequences, 173/770 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! [MP z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process Received shutdown request...