/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:43:47,553 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:43:47,556 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:43:47,574 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:43:47,574 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:43:47,576 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:43:47,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:43:47,591 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:43:47,594 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:43:47,595 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:43:47,596 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:43:47,598 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:43:47,598 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:43:47,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:43:47,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:43:47,601 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:43:47,602 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:43:47,603 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:43:47,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:43:47,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:43:47,607 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:43:47,608 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:43:47,609 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:43:47,610 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:43:47,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 10:43:47,613 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 10:43:47,613 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 10:43:47,614 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 10:43:47,614 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 10:43:47,615 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 10:43:47,615 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 10:43:47,616 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 10:43:47,617 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 10:43:47,617 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 10:43:47,618 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 10:43:47,618 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 10:43:47,619 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 10:43:47,619 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 10:43:47,620 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:43:47,620 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:43:47,621 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:43:47,622 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 10:43:47,636 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:43:47,636 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:43:47,637 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:43:47,638 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:43:47,638 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:43:47,638 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:43:47,638 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:43:47,638 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:43:47,639 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:43:47,639 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:43:47,639 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:43:47,639 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:43:47,639 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:43:47,640 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:43:47,640 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:43:47,640 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:43:47,640 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:43:47,640 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:43:47,641 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:43:47,641 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:43:47,641 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:43:47,641 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:43:47,641 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:43:47,642 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:43:47,642 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:43:47,642 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:43:47,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:47,642 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:43:47,643 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:43:47,643 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 -> NOT_INCREMENTALLY [2020-07-21 10:43:47,922 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:43:47,942 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:43:47,945 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:43:47,947 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:43:47,947 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:43:47,948 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 10:43:48,022 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13a87059f/a63446ce8f9a41c69e9c2bdc0d4fa771/FLAG6f1487ed6 [2020-07-21 10:43:48,472 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:43:48,472 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 10:43:48,479 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13a87059f/a63446ce8f9a41c69e9c2bdc0d4fa771/FLAG6f1487ed6 [2020-07-21 10:43:48,852 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/13a87059f/a63446ce8f9a41c69e9c2bdc0d4fa771 [2020-07-21 10:43:48,863 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:43:48,866 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:43:48,867 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:43:48,867 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:43:48,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:43:48,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:43:48" (1/1) ... [2020-07-21 10:43:48,874 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@82fd315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:48, skipping insertion in model container [2020-07-21 10:43:48,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:43:48" (1/1) ... [2020-07-21 10:43:48,882 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:43:48,899 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:43:49,056 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:43:49,060 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:43:49,076 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:43:49,090 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:43:49,091 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49 WrapperNode [2020-07-21 10:43:49,091 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:43:49,092 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:43:49,092 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:43:49,092 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:43:49,105 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,110 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,111 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,114 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,116 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,117 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (1/1) ... [2020-07-21 10:43:49,118 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:43:49,119 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:43:49,119 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:43:49,119 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:43:49,120 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (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 10:43:49,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:43:49,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:43:49,258 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 10:43:49,258 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:43:49,258 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:43:49,258 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:43:49,258 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 10:43:49,258 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:43:49,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:43:49,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:43:49,432 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:43:49,432 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:43:49,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:43:49 BoogieIcfgContainer [2020-07-21 10:43:49,437 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:43:49,454 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:43:49,455 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:43:49,465 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:43:49,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:43:48" (1/3) ... [2020-07-21 10:43:49,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18723a13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:43:49, skipping insertion in model container [2020-07-21 10:43:49,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:43:49" (2/3) ... [2020-07-21 10:43:49,467 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18723a13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:43:49, skipping insertion in model container [2020-07-21 10:43:49,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:43:49" (3/3) ... [2020-07-21 10:43:49,476 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-21 10:43:49,503 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:43:49,517 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:43:49,550 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:43:49,572 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:43:49,572 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:43:49,572 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:43:49,572 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:43:49,573 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:43:49,573 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:43:49,573 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:43:49,573 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:43:49,587 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 10:43:49,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:43:49,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:49,594 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:49,595 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:49,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:49,600 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 10:43:49,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:49,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265180952] [2020-07-21 10:43:49,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:49,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:49,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:43:49,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:49,756 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 10:43:49,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:43:49,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265180952] [2020-07-21 10:43:49,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:43:49,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:43:49,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18990419] [2020-07-21 10:43:49,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:43:49,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:49,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:43:49,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:43:49,780 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 10:43:49,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:49,878 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 10:43:49,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:43:49,880 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:43:49,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:49,903 INFO L225 Difference]: With dead ends: 35 [2020-07-21 10:43:49,904 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 10:43:49,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:43:49,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 10:43:49,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 10:43:49,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:43:49,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:43:49,974 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 10:43:49,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:49,975 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:43:49,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:43:49,977 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:43:49,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:43:49,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:49,992 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:50,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:50,210 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:50,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:50,211 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 10:43:50,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:50,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255936808] [2020-07-21 10:43:50,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:50,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:50,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:43:50,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:50,273 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 10:43:50,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:43:50,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255936808] [2020-07-21 10:43:50,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:43:50,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:43:50,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244877564] [2020-07-21 10:43:50,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:43:50,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:50,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:43:50,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:43:50,278 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 10:43:50,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:50,330 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 10:43:50,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:43:50,331 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:43:50,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:50,333 INFO L225 Difference]: With dead ends: 27 [2020-07-21 10:43:50,334 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 10:43:50,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:43:50,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 10:43:50,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 10:43:50,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 10:43:50,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 10:43:50,348 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 10:43:50,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:50,349 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 10:43:50,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:43:50,349 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 10:43:50,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:43:50,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:50,352 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:50,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:50,561 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:50,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:50,562 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 10:43:50,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:50,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629870123] [2020-07-21 10:43:50,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:50,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:50,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:43:50,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:50,642 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 10:43:50,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:50,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:50,856 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:43:50,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629870123] [2020-07-21 10:43:50,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:50,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:43:50,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671210141] [2020-07-21 10:43:50,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:43:50,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:50,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:43:50,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:43:50,859 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 10:43:50,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:50,980 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 10:43:50,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:43:50,981 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:43:50,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:50,983 INFO L225 Difference]: With dead ends: 32 [2020-07-21 10:43:50,983 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 10:43:50,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:43:50,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 10:43:50,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 10:43:50,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:43:51,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:43:51,000 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 10:43:51,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:51,000 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:43:51,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:43:51,001 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:43:51,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:43:51,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:51,002 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:51,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:51,205 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:51,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:51,206 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 10:43:51,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:51,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017891903] [2020-07-21 10:43:51,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:51,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:51,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:43:51,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:51,284 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 10:43:51,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:51,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:51,438 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 10:43:51,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017891903] [2020-07-21 10:43:51,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:51,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 10:43:51,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29997456] [2020-07-21 10:43:51,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:43:51,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:51,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:43:51,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:43:51,440 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 10:43:51,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:51,513 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 10:43:51,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 10:43:51,513 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 10:43:51,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:51,515 INFO L225 Difference]: With dead ends: 37 [2020-07-21 10:43:51,516 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 10:43:51,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:43:51,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 10:43:51,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 10:43:51,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 10:43:51,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 10:43:51,525 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 10:43:51,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:51,525 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 10:43:51,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:43:51,526 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 10:43:51,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:43:51,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:51,527 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:51,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:51,738 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:51,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:51,740 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 10:43:51,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:51,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876765280] [2020-07-21 10:43:51,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:51,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:51,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:43:51,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:51,849 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 10:43:51,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:52,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,187 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:43:52,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876765280] [2020-07-21 10:43:52,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:52,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:43:52,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839366007] [2020-07-21 10:43:52,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:43:52,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:52,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:43:52,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:43:52,190 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 10:43:52,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:52,318 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 10:43:52,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:43:52,319 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 10:43:52,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:52,321 INFO L225 Difference]: With dead ends: 42 [2020-07-21 10:43:52,321 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 10:43:52,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:43:52,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 10:43:52,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 10:43:52,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:43:52,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:43:52,332 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 10:43:52,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:52,333 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:43:52,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:43:52,333 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:43:52,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 10:43:52,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:52,335 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:52,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:52,550 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:52,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:52,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 10:43:52,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:52,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328949100] [2020-07-21 10:43:52,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:52,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:52,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 10:43:52,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:52,619 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 10:43:52,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:52,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:52,895 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 10:43:52,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328949100] [2020-07-21 10:43:52,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:52,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 10:43:52,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329764041] [2020-07-21 10:43:52,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:43:52,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:52,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:43:52,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:43:52,897 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 10:43:53,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:53,016 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 10:43:53,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:43:53,016 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 10:43:53,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:53,019 INFO L225 Difference]: With dead ends: 47 [2020-07-21 10:43:53,019 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 10:43:53,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 10:43:53,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 10:43:53,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 10:43:53,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 10:43:53,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 10:43:53,031 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 10:43:53,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:53,031 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 10:43:53,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:43:53,031 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 10:43:53,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 10:43:53,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:53,034 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:53,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:53,244 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:53,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:53,244 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 10:43:53,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:53,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783770671] [2020-07-21 10:43:53,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:53,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:53,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:43:53,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:53,357 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 10:43:53,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:53,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:53,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:53,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:53,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:53,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:53,937 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 10:43:53,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783770671] [2020-07-21 10:43:53,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:53,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:43:53,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182265928] [2020-07-21 10:43:53,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:43:53,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:53,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:43:53,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:43:53,943 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 10:43:54,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:54,122 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 10:43:54,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:43:54,123 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 10:43:54,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:54,125 INFO L225 Difference]: With dead ends: 52 [2020-07-21 10:43:54,125 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 10:43:54,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:43:54,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 10:43:54,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 10:43:54,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:43:54,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:43:54,142 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 10:43:54,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:54,143 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:43:54,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:43:54,143 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:43:54,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 10:43:54,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:54,145 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:54,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:54,355 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:54,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:54,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 10:43:54,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:54,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544702318] [2020-07-21 10:43:54,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:54,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:54,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 10:43:54,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:54,475 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 10:43:54,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:54,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:55,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:55,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:55,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:55,090 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 10:43:55,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544702318] [2020-07-21 10:43:55,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:55,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 10:43:55,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803082359] [2020-07-21 10:43:55,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 10:43:55,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:55,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 10:43:55,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:43:55,094 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 10:43:55,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:55,210 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 10:43:55,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:43:55,210 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 10:43:55,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:55,213 INFO L225 Difference]: With dead ends: 57 [2020-07-21 10:43:55,213 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 10:43:55,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:43:55,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 10:43:55,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 10:43:55,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 10:43:55,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 10:43:55,226 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 10:43:55,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:55,227 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 10:43:55,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 10:43:55,227 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 10:43:55,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 10:43:55,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:55,229 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:55,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:55,441 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:55,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:55,442 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 10:43:55,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:55,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27441485] [2020-07-21 10:43:55,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:55,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:55,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:43:55,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:55,607 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 10:43:55,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:56,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:56,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:56,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:56,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:56,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:56,559 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 10:43:56,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27441485] [2020-07-21 10:43:56,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:56,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:43:56,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905078328] [2020-07-21 10:43:56,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:43:56,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:56,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:43:56,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:43:56,563 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 10:43:56,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:56,848 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 10:43:56,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:43:56,849 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 10:43:56,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:56,852 INFO L225 Difference]: With dead ends: 62 [2020-07-21 10:43:56,853 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 10:43:56,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:43:56,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 10:43:56,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 10:43:56,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:43:56,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:43:56,866 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 10:43:56,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:56,866 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:43:56,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:43:56,867 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:43:56,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 10:43:56,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:56,870 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:57,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:57,083 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:57,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:57,083 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 10:43:57,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:57,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87093074] [2020-07-21 10:43:57,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:57,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:57,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 10:43:57,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:57,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 10:43:57,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:43:57,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:43:58,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 10:43:58,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87093074] [2020-07-21 10:43:58,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:43:58,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 10:43:58,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521178837] [2020-07-21 10:43:58,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 10:43:58,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:43:58,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 10:43:58,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 10:43:58,339 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 10:43:58,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:43:58,487 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 10:43:58,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:43:58,487 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 10:43:58,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:43:58,491 INFO L225 Difference]: With dead ends: 67 [2020-07-21 10:43:58,491 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 10:43:58,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 10:43:58,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 10:43:58,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 10:43:58,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 10:43:58,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 10:43:58,503 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 10:43:58,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:43:58,503 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 10:43:58,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 10:43:58,504 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 10:43:58,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 10:43:58,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:43:58,508 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:43:58,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:43:58,721 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:43:58,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:43:58,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 10:43:58,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:43:58,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330876569] [2020-07-21 10:43:58,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:43:58,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:43:58,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:43:58,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:43:58,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 10:43:58,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:00,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:00,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 10:44:00,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330876569] [2020-07-21 10:44:00,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:00,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:00,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333051549] [2020-07-21 10:44:00,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:00,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:00,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:00,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:00,777 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 10:44:00,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:00,969 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 10:44:00,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:00,970 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 10:44:00,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:00,973 INFO L225 Difference]: With dead ends: 72 [2020-07-21 10:44:00,973 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 10:44:00,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:00,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 10:44:00,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 10:44:00,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:00,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:00,985 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 10:44:00,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:00,986 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:00,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:00,986 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:00,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 10:44:00,991 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:00,991 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:01,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:01,206 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:01,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:01,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 10:44:01,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:01,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529791900] [2020-07-21 10:44:01,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:01,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:01,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 10:44:01,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:01,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 10:44:01,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:02,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:02,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:03,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:03,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:03,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:03,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 10:44:03,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529791900] [2020-07-21 10:44:03,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:03,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 10:44:03,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804202260] [2020-07-21 10:44:03,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 10:44:03,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:03,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 10:44:03,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 10:44:03,264 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 10:44:03,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:03,474 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 10:44:03,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 10:44:03,475 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 10:44:03,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:03,480 INFO L225 Difference]: With dead ends: 77 [2020-07-21 10:44:03,480 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 10:44:03,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:03,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 10:44:03,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 10:44:03,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 10:44:03,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 10:44:03,492 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 10:44:03,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:03,493 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 10:44:03,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 10:44:03,493 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 10:44:03,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 10:44:03,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:03,503 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:03,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:03,718 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:03,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:03,719 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 10:44:03,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:03,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692598013] [2020-07-21 10:44:03,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:03,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:03,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:44:03,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:04,160 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 10:44:04,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:06,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:06,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:06,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:07,329 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 10:44:07,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692598013] [2020-07-21 10:44:07,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:07,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:44:07,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454812664] [2020-07-21 10:44:07,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:44:07,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:07,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:44:07,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:44:07,332 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 10:44:07,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:07,787 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 10:44:07,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:44:07,788 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 10:44:07,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:07,794 INFO L225 Difference]: With dead ends: 82 [2020-07-21 10:44:07,794 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 10:44:07,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:44:07,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 10:44:07,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 10:44:07,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:44:07,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:44:07,820 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 10:44:07,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:07,824 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:44:07,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:44:07,825 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:44:07,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 10:44:07,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:07,830 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:08,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:08,040 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:08,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:08,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 10:44:08,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:08,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924179687] [2020-07-21 10:44:08,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:08,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:08,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 10:44:08,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:08,409 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 10:44:08,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:10,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:10,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:10,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:10,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:10,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:11,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:11,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:11,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:11,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:11,334 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 10:44:11,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924179687] [2020-07-21 10:44:11,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:11,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 10:44:11,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622822913] [2020-07-21 10:44:11,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 10:44:11,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:11,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 10:44:11,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 10:44:11,336 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 10:44:11,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:11,601 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 10:44:11,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 10:44:11,602 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 10:44:11,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:11,606 INFO L225 Difference]: With dead ends: 87 [2020-07-21 10:44:11,606 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 10:44:11,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 10:44:11,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 10:44:11,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 10:44:11,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 10:44:11,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 10:44:11,638 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 10:44:11,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:11,639 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 10:44:11,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 10:44:11,639 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 10:44:11,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 10:44:11,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:11,659 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:11,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:11,873 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:11,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:11,874 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 10:44:11,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:11,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400290470] [2020-07-21 10:44:11,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:12,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:12,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:44:12,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:12,936 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 10:44:12,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:16,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:16,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:17,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:18,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 10:44:19,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400290470] [2020-07-21 10:44:19,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:19,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:44:19,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604174296] [2020-07-21 10:44:19,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:44:19,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:19,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:44:19,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:44:19,230 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 10:44:19,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:19,761 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 10:44:19,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:44:19,762 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 10:44:19,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:19,766 INFO L225 Difference]: With dead ends: 92 [2020-07-21 10:44:19,766 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 10:44:19,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:44:19,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 10:44:19,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 10:44:19,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:44:19,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:44:19,795 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 10:44:19,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:19,797 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:44:19,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:44:19,797 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:44:19,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-21 10:44:19,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:19,802 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:20,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:20,016 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:20,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:20,016 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-21 10:44:20,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:20,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697268981] [2020-07-21 10:44:20,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:20,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:20,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 1457 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 10:44:20,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-21 10:44:20,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:23,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:23,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:23,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:24,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-21 10:44:25,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697268981] [2020-07-21 10:44:25,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:25,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 10:44:25,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974062663] [2020-07-21 10:44:25,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 10:44:25,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:25,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 10:44:25,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 10:44:25,471 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 10:44:25,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:25,957 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 10:44:25,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 10:44:25,958 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-21 10:44:25,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:25,962 INFO L225 Difference]: With dead ends: 97 [2020-07-21 10:44:25,962 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 10:44:25,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:44:25,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 10:44:25,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 10:44:25,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 10:44:25,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 10:44:25,980 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-21 10:44:25,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:25,981 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 10:44:25,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 10:44:25,982 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 10:44:25,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-21 10:44:25,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:25,998 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:26,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:26,211 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:26,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:26,212 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-21 10:44:26,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:26,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575133986] [2020-07-21 10:44:26,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:44:26,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:26,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 2843 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:44:26,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:27,412 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-21 10:44:27,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:31,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:33,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:34,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:35,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:36,065 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-21 10:44:36,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575133986] [2020-07-21 10:44:36,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:36,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:44:36,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566485464] [2020-07-21 10:44:36,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:44:36,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:36,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:44:36,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:36,069 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 10:44:36,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:36,766 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 10:44:36,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:44:36,767 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-21 10:44:36,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:36,772 INFO L225 Difference]: With dead ends: 102 [2020-07-21 10:44:36,772 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 10:44:36,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:44:36,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 10:44:36,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 10:44:36,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:44:36,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:44:36,788 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-21 10:44:36,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:36,790 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:44:36,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:44:36,790 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:44:36,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-21 10:44:36,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:36,817 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:37,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:37,031 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:37,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:37,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-21 10:44:37,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:37,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42989877] [2020-07-21 10:44:37,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:37,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:37,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 4043 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 10:44:37,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:39,086 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-21 10:44:39,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:44:45,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:47,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:48,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:49,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:49,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:49,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:49,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:49,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:44:50,668 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-21 10:44:50,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42989877] [2020-07-21 10:44:50,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:44:50,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 10:44:50,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557967184] [2020-07-21 10:44:50,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 10:44:50,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:44:50,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 10:44:50,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 10:44:50,672 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 10:44:51,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:44:51,384 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 10:44:51,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 10:44:51,385 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1820 [2020-07-21 10:44:51,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:44:51,391 INFO L225 Difference]: With dead ends: 107 [2020-07-21 10:44:51,391 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 10:44:51,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 10:44:51,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 10:44:51,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 10:44:51,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 10:44:51,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 10:44:51,410 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-21 10:44:51,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:44:51,412 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 10:44:51,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 10:44:51,412 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 10:44:51,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-21 10:44:51,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:44:51,442 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:44:51,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:51,643 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:44:51,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:44:51,645 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-21 10:44:51,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:44:51,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774397758] [2020-07-21 10:44:51,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:44:52,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:44:52,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 4525 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:44:52,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:44:54,182 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-21 10:44:54,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:00,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:04,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:05,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:06,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:07,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:09,405 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-21 10:45:09,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774397758] [2020-07-21 10:45:09,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:09,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:45:09,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366996747] [2020-07-21 10:45:09,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:45:09,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:09,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:45:09,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:45:09,410 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 10:45:10,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:10,342 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 10:45:10,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:45:10,343 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-21 10:45:10,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:10,350 INFO L225 Difference]: With dead ends: 112 [2020-07-21 10:45:10,350 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 10:45:10,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:45:10,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 10:45:10,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 10:45:10,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:45:10,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:45:10,366 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-21 10:45:10,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:10,368 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:45:10,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:45:10,369 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:45:10,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3145 [2020-07-21 10:45:10,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:10,424 INFO L422 BasicCegarLoop]: trace histogram [461, 461, 371, 230, 230, 230, 230, 230, 230, 230, 141, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:10,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:10,625 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:10,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:10,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1076189233, now seen corresponding path program 9 times [2020-07-21 10:45:10,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:10,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1197463136] [2020-07-21 10:45:10,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:11,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:11,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 6982 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 10:45:11,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:15,911 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22265 refuted. 0 times theorem prover too weak. 572801 trivial. 0 not checked. [2020-07-21 10:45:15,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:45:24,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:30,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:32,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:32,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:33,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:34,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:35,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:45:38,573 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22391 refuted. 0 times theorem prover too weak. 572675 trivial. 0 not checked. [2020-07-21 10:45:38,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1197463136] [2020-07-21 10:45:38,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:45:38,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 10:45:38,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033709658] [2020-07-21 10:45:38,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 10:45:38,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:45:38,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 10:45:38,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 10:45:38,577 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 10:45:39,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:45:39,369 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 10:45:39,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 10:45:39,372 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3144 [2020-07-21 10:45:39,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:45:39,378 INFO L225 Difference]: With dead ends: 117 [2020-07-21 10:45:39,378 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 10:45:39,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6297 GetRequests, 6244 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 10:45:39,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 10:45:39,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 10:45:39,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 10:45:39,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 10:45:39,396 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3144 [2020-07-21 10:45:39,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:45:39,399 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 10:45:39,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 10:45:39,399 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 10:45:39,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 10:45:39,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:45:39,484 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:45:39,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:39,685 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:45:39,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:45:39,687 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 10:45:39,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:45:39,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872955151] [2020-07-21 10:45:39,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:45:41,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:45:41,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 8875 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:45:41,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:45:46,276 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 10:45:46,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:00,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:00,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:06,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:09,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:11,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:12,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:13,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:13,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:13,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:14,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:14,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:14,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:19,761 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 10:46:19,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872955151] [2020-07-21 10:46:19,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:46:19,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:46:19,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282149847] [2020-07-21 10:46:19,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:46:19,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:46:19,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:46:19,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:46:19,766 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 10:46:20,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:46:20,756 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 10:46:20,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:46:20,758 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 10:46:20,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:46:20,772 INFO L225 Difference]: With dead ends: 122 [2020-07-21 10:46:20,772 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 10:46:20,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:46:20,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 10:46:20,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 10:46:20,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:46:20,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:46:20,800 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 10:46:20,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:46:20,806 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:46:20,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:46:20,807 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:46:20,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3877 [2020-07-21 10:46:20,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:46:20,973 INFO L422 BasicCegarLoop]: trace histogram [569, 569, 455, 284, 284, 284, 284, 284, 284, 284, 171, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:46:21,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:21,188 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:46:21,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:46:21,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1124129157, now seen corresponding path program 10 times [2020-07-21 10:46:21,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:46:21,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858058486] [2020-07-21 10:46:21,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:46:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:46:22,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 8608 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 10:46:22,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:46:27,517 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30601 refuted. 0 times theorem prover too weak. 875910 trivial. 0 not checked. [2020-07-21 10:46:27,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:46:40,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:47,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:47,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:51,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:51,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:52,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:52,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:54,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:54,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:54,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:54,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:54,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:55,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:55,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:55,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:55,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:46:55,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:47:00,135 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30756 refuted. 0 times theorem prover too weak. 875755 trivial. 0 not checked. [2020-07-21 10:47:00,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858058486] [2020-07-21 10:47:00,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:47:00,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 10:47:00,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497423033] [2020-07-21 10:47:00,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 10:47:00,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:47:00,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 10:47:00,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 10:47:00,140 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 10:47:01,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:47:01,322 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 10:47:01,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 10:47:01,324 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3876 [2020-07-21 10:47:01,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:47:01,332 INFO L225 Difference]: With dead ends: 127 [2020-07-21 10:47:01,332 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 10:47:01,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7762 GetRequests, 7704 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 10:47:01,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 10:47:01,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 10:47:01,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 10:47:01,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 10:47:01,354 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3876 [2020-07-21 10:47:01,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:47:01,358 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 10:47:01,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 10:47:01,358 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 10:47:02,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14041 [2020-07-21 10:47:02,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:47:02,595 INFO L422 BasicCegarLoop]: trace histogram [2159, 2159, 1080, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:47:02,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:02,798 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:47:02,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:47:02,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1760661492, now seen corresponding path program 11 times [2020-07-21 10:47:02,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:47:02,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088876427] [2020-07-21 10:47:02,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:47:07,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:47:07,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 31321 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:47:07,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:48:07,842 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123136 refuted. 0 times theorem prover too weak. 12089820 trivial. 0 not checked. [2020-07-21 10:48:07,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:48:49,996 WARN L193 SmtUtils]: Spent 791.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:49:11,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:34,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:42,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:42,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:49,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:49,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:53,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:54,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:54,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:55,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:55,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:56,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:56,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:56,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:56,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:49:56,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:50:56,108 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123312 refuted. 0 times theorem prover too weak. 12089644 trivial. 0 not checked. [2020-07-21 10:50:56,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088876427] [2020-07-21 10:50:56,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:50:56,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:50:56,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392842602] [2020-07-21 10:50:56,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:50:56,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:50:56,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:50:56,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:50:56,123 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 10:50:57,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:50:57,658 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 10:50:57,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:50:57,659 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 14040 [2020-07-21 10:50:57,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:50:57,672 INFO L225 Difference]: With dead ends: 132 [2020-07-21 10:50:57,673 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 10:50:57,674 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28092 GetRequests, 28029 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:50:57,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 10:50:57,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 10:50:57,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:50:57,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:50:57,695 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 14040 [2020-07-21 10:50:57,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:50:57,703 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:50:57,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:50:57,704 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:50:58,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5607 [2020-07-21 10:50:58,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:50:58,019 INFO L422 BasicCegarLoop]: trace histogram [823, 823, 661, 411, 411, 411, 411, 411, 411, 411, 250, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:50:58,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:50:58,233 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:50:58,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:50:58,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1269911056, now seen corresponding path program 11 times [2020-07-21 10:50:58,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:50:58,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984001824] [2020-07-21 10:50:58,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:51:00,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:51:00,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 12449 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 10:51:00,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:51:10,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1908162 backedges. 5275 proven. 49606 refuted. 0 times theorem prover too weak. 1853281 trivial. 0 not checked. [2020-07-21 10:51:10,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:51:15,869 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 10:51:34,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:34,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:41,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:47,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:47,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:50,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:50,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:52,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:52,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:53,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:53,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:53,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:51:54,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:52:04,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1908162 backedges. 5275 proven. 49793 refuted. 0 times theorem prover too weak. 1853094 trivial. 0 not checked. [2020-07-21 10:52:04,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984001824] [2020-07-21 10:52:04,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:52:04,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 10:52:04,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810516555] [2020-07-21 10:52:04,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 10:52:04,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:52:04,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 10:52:04,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 10:52:04,136 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 10:52:05,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:52:05,776 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 10:52:05,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 10:52:05,777 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5606 [2020-07-21 10:52:05,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:52:05,784 INFO L225 Difference]: With dead ends: 137 [2020-07-21 10:52:05,785 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 10:52:05,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11223 GetRequests, 11160 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 10:52:05,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 10:52:05,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 10:52:05,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 10:52:05,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 10:52:05,810 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5606 [2020-07-21 10:52:05,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:52:05,812 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 10:52:05,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 10:52:05,813 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 10:52:06,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-21 10:52:06,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:52:06,547 INFO L422 BasicCegarLoop]: trace histogram [1943, 1943, 972, 971, 971, 971, 971, 971, 971, 971, 971, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:52:06,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:52:06,748 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:52:06,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:52:06,752 INFO L82 PathProgramCache]: Analyzing trace with hash 904472140, now seen corresponding path program 12 times [2020-07-21 10:52:06,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:52:06,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748510617] [2020-07-21 10:52:06,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:52:11,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:52:11,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 28189 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:52:11,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:52:57,955 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13757 proven. 119407 refuted. 0 times theorem prover too weak. 9768123 trivial. 0 not checked. [2020-07-21 10:52:57,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:53:52,535 WARN L193 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 10:53:58,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:22,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:22,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:35,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:35,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:47,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:51,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:54,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:56,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:57,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:57,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:58,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:58,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:58,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:54:58,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:46,245 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13757 proven. 119617 refuted. 0 times theorem prover too weak. 9767913 trivial. 0 not checked. [2020-07-21 10:55:46,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748510617] [2020-07-21 10:55:46,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:55:46,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 10:55:46,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181029045] [2020-07-21 10:55:46,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 10:55:46,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:46,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 10:55:46,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 10:55:46,253 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 10:55:47,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:47,985 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 10:55:47,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 10:55:47,987 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12636 [2020-07-21 10:55:47,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:47,998 INFO L225 Difference]: With dead ends: 142 [2020-07-21 10:55:47,998 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 10:55:47,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25285 GetRequests, 25217 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 10:55:48,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 10:55:48,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 10:55:48,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 10:55:48,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 10:55:48,026 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12636 [2020-07-21 10:55:48,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:48,032 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 10:55:48,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 10:55:48,032 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 10:55:49,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10881 [2020-07-21 10:55:49,447 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:49,454 INFO L422 BasicCegarLoop]: trace histogram [1597, 1597, 1291, 798, 798, 798, 798, 798, 798, 798, 493, 306, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:49,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:49,669 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:49,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:49,673 INFO L82 PathProgramCache]: Analyzing trace with hash 803993713, now seen corresponding path program 12 times [2020-07-21 10:55:49,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:49,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093278986] [2020-07-21 10:55:49,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:53,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:53,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 24158 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 10:55:53,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:56:28,697 INFO L134 CoverageAnalysis]: Checked inductivity of 7202331 backedges. 10911 proven. 105561 refuted. 0 times theorem prover too weak. 7085859 trivial. 0 not checked. [2020-07-21 10:56:28,698 INFO L328 TraceCheckSpWp]: Computing backward predicates...