/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/loopv2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 16:13:16,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 16:13:16,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 16:13:16,601 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 16:13:16,601 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 16:13:16,602 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 16:13:16,604 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 16:13:16,605 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 16:13:16,607 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 16:13:16,608 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 16:13:16,609 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 16:13:16,610 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 16:13:16,610 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 16:13:16,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 16:13:16,612 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 16:13:16,613 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 16:13:16,615 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 16:13:16,616 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 16:13:16,618 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 16:13:16,622 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 16:13:16,626 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 16:13:16,627 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 16:13:16,628 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 16:13:16,630 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 16:13:16,633 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 16:13:16,634 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 16:13:16,634 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 16:13:16,635 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 16:13:16,638 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 16:13:16,639 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 16:13:16,639 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 16:13:16,640 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 16:13:16,641 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 16:13:16,642 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 16:13:16,643 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 16:13:16,644 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 16:13:16,644 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 16:13:16,644 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 16:13:16,645 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 16:13:16,646 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 16:13:16,647 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 16:13:16,648 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-12 16:13:16,702 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 16:13:16,702 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 16:13:16,705 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 16:13:16,706 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 16:13:16,706 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 16:13:16,706 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 16:13:16,706 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 16:13:16,707 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 16:13:16,707 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 16:13:16,708 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 16:13:16,708 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 16:13:16,708 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 16:13:16,708 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 16:13:16,708 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 16:13:16,709 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 16:13:16,709 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 16:13:16,709 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 16:13:16,709 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 16:13:16,709 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 16:13:16,710 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 16:13:16,710 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 16:13:16,711 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 16:13:16,711 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 16:13:16,711 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 16:13:16,712 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 16:13:16,712 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 16:13:16,712 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 16:13:16,712 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 16:13:16,712 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 16:13:16,713 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 16:13:17,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 16:13:17,082 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 16:13:17,086 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 16:13:17,087 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 16:13:17,088 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 16:13:17,089 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/loopv2.c [2020-10-12 16:13:17,147 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6285e0656/bc7a6efc5e6c4863ba26a0f4665b648c/FLAG69c6c6fe8 [2020-10-12 16:13:17,584 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 16:13:17,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops-crafted-1/loopv2.c [2020-10-12 16:13:17,589 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6285e0656/bc7a6efc5e6c4863ba26a0f4665b648c/FLAG69c6c6fe8 [2020-10-12 16:13:18,041 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6285e0656/bc7a6efc5e6c4863ba26a0f4665b648c [2020-10-12 16:13:18,052 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 16:13:18,053 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 16:13:18,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 16:13:18,056 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 16:13:18,059 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 16:13:18,060 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,063 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@593ffdbb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18, skipping insertion in model container [2020-10-12 16:13:18,064 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 16:13:18,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 16:13:18,277 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:13:18,283 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 16:13:18,301 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:13:18,317 INFO L208 MainTranslator]: Completed translation [2020-10-12 16:13:18,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18 WrapperNode [2020-10-12 16:13:18,318 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 16:13:18,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 16:13:18,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 16:13:18,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 16:13:18,333 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,334 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,417 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,422 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,429 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... [2020-10-12 16:13:18,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 16:13:18,431 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 16:13:18,431 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 16:13:18,431 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 16:13:18,432 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-10-12 16:13:18,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 16:13:18,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 16:13:18,495 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-12 16:13:18,495 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-12 16:13:18,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-12 16:13:18,496 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 16:13:18,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 16:13:18,497 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 16:13:18,687 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 16:13:18,687 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-10-12 16:13:18,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:13:18 BoogieIcfgContainer [2020-10-12 16:13:18,692 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 16:13:18,693 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 16:13:18,693 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 16:13:18,696 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 16:13:18,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 04:13:18" (1/3) ... [2020-10-12 16:13:18,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3974c018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:13:18, skipping insertion in model container [2020-10-12 16:13:18,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:13:18" (2/3) ... [2020-10-12 16:13:18,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3974c018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:13:18, skipping insertion in model container [2020-10-12 16:13:18,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:13:18" (3/3) ... [2020-10-12 16:13:18,700 INFO L109 eAbstractionObserver]: Analyzing ICFG loopv2.c [2020-10-12 16:13:18,711 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 16:13:18,719 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 16:13:18,734 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 16:13:18,759 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 16:13:18,759 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 16:13:18,760 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 16:13:18,760 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 16:13:18,760 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 16:13:18,760 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 16:13:18,760 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 16:13:18,760 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 16:13:18,777 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-10-12 16:13:18,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-12 16:13:18,783 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:18,784 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:18,784 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:18,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:18,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1292298132, now seen corresponding path program 1 times [2020-10-12 16:13:18,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:18,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027562403] [2020-10-12 16:13:18,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:18,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:18,949 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:19,059 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:19,201 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:19,202 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-12 16:13:19,205 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:19,205 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 278 [2020-10-12 16:13:19,211 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:19,212 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-12 16:13:19,212 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:19,212 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-12 16:13:19,212 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 6 [2020-10-12 16:13:19,429 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 8 [2020-10-12 16:13:19,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:19,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:19,520 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:19,532 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:19,533 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:19,533 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:19,534 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-12 16:13:19,537 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:19,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:19,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:19,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:19,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:19,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:19,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027562403] [2020-10-12 16:13:19,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:13:19,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-12 16:13:19,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241285081] [2020-10-12 16:13:19,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 16:13:19,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:19,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 16:13:19,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-10-12 16:13:19,586 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 7 states. [2020-10-12 16:13:19,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:19,828 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2020-10-12 16:13:19,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-12 16:13:19,830 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-10-12 16:13:19,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:19,839 INFO L225 Difference]: With dead ends: 47 [2020-10-12 16:13:19,840 INFO L226 Difference]: Without dead ends: 16 [2020-10-12 16:13:19,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:13:19,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-12 16:13:19,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-12 16:13:19,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-12 16:13:19,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-10-12 16:13:19,887 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2020-10-12 16:13:19,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:19,888 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-10-12 16:13:19,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 16:13:19,888 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-10-12 16:13:19,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-12 16:13:19,889 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:19,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:19,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 16:13:19,890 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:19,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:19,890 INFO L82 PathProgramCache]: Analyzing trace with hash -654989578, now seen corresponding path program 1 times [2020-10-12 16:13:19,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:19,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897010581] [2020-10-12 16:13:19,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:19,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:19,917 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:19,961 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,191 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:20,191 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-12 16:13:20,191 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:20,192 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 283 [2020-10-12 16:13:20,192 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:20,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 16:13:20,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:20,193 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-12 16:13:20,193 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:20,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:20,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:20,315 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,317 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:20,317 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:20,318 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:20,318 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:13:20,318 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:20,318 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:20,318 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:20,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:20,319 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:20,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:20,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897010581] [2020-10-12 16:13:20,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:20,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-12 16:13:20,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299593513] [2020-10-12 16:13:20,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-12 16:13:20,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:20,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-12 16:13:20,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-12 16:13:20,327 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 8 states. [2020-10-12 16:13:20,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:20,479 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-10-12 16:13:20,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-12 16:13:20,480 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-10-12 16:13:20,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:20,483 INFO L225 Difference]: With dead ends: 26 [2020-10-12 16:13:20,483 INFO L226 Difference]: Without dead ends: 21 [2020-10-12 16:13:20,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-12 16:13:20,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-12 16:13:20,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2020-10-12 16:13:20,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-12 16:13:20,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-10-12 16:13:20,492 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2020-10-12 16:13:20,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:20,492 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-10-12 16:13:20,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-12 16:13:20,492 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-10-12 16:13:20,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-12 16:13:20,493 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:20,493 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:20,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 16:13:20,494 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:20,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:20,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1205697331, now seen corresponding path program 1 times [2020-10-12 16:13:20,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:20,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022378510] [2020-10-12 16:13:20,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:20,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:20,514 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,551 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,694 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:20,695 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-12 16:13:20,695 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:20,695 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 187 [2020-10-12 16:13:20,695 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:20,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 16:13:20,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-12 16:13:20,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-12 16:13:20,696 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:20,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:20,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:20,796 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,798 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:20,798 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:20,799 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:20,799 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:13:20,799 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:20,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:20,800 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:20,800 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:20,800 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:20,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:20,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022378510] [2020-10-12 16:13:20,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:20,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-12 16:13:20,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086503270] [2020-10-12 16:13:20,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-12 16:13:20,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:20,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-12 16:13:20,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-12 16:13:20,806 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-10-12 16:13:20,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:20,928 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-10-12 16:13:20,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-12 16:13:20,929 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-10-12 16:13:20,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:20,930 INFO L225 Difference]: With dead ends: 25 [2020-10-12 16:13:20,930 INFO L226 Difference]: Without dead ends: 17 [2020-10-12 16:13:20,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:13:20,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-12 16:13:20,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-12 16:13:20,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-12 16:13:20,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-10-12 16:13:20,936 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-10-12 16:13:20,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:20,937 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-10-12 16:13:20,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-12 16:13:20,937 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-10-12 16:13:20,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-12 16:13:20,938 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:20,938 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:20,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 16:13:20,939 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:20,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:20,939 INFO L82 PathProgramCache]: Analyzing trace with hash -891366444, now seen corresponding path program 2 times [2020-10-12 16:13:20,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:20,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61491716] [2020-10-12 16:13:20,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:20,955 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:20,995 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,058 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:21,058 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-12 16:13:21,059 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:21,059 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 107 [2020-10-12 16:13:21,059 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:21,059 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-12 16:13:21,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:21,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-12 16:13:21,060 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:21,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:21,191 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,193 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:21,193 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:21,194 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:21,194 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:13:21,194 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:21,195 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:21,195 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:21,195 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:21,196 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:21,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61491716] [2020-10-12 16:13:21,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:21,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-12 16:13:21,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497247397] [2020-10-12 16:13:21,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-12 16:13:21,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:21,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-12 16:13:21,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-12 16:13:21,201 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-10-12 16:13:21,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:21,376 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-10-12 16:13:21,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-12 16:13:21,377 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-10-12 16:13:21,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:21,378 INFO L225 Difference]: With dead ends: 25 [2020-10-12 16:13:21,378 INFO L226 Difference]: Without dead ends: 18 [2020-10-12 16:13:21,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:13:21,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-12 16:13:21,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-12 16:13:21,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-12 16:13:21,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-10-12 16:13:21,384 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-10-12 16:13:21,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:21,384 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-10-12 16:13:21,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-12 16:13:21,385 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-10-12 16:13:21,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-12 16:13:21,385 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:21,386 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:21,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-12 16:13:21,386 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:21,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:21,387 INFO L82 PathProgramCache]: Analyzing trace with hash 370885302, now seen corresponding path program 3 times [2020-10-12 16:13:21,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:21,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691595828] [2020-10-12 16:13:21,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:21,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:21,403 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,437 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,498 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:21,498 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-12 16:13:21,499 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:21,499 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 100 [2020-10-12 16:13:21,499 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:21,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-12 16:13:21,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:21,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-12 16:13:21,500 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:21,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:21,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:21,667 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,668 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:21,668 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:21,669 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:21,669 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:21,669 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:21,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:21,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:21,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:21,671 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:21,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:21,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691595828] [2020-10-12 16:13:21,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:21,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-12 16:13:21,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593174176] [2020-10-12 16:13:21,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-12 16:13:21,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:21,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-12 16:13:21,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-10-12 16:13:21,679 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-10-12 16:13:21,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:21,879 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-10-12 16:13:21,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-12 16:13:21,880 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-10-12 16:13:21,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:21,880 INFO L225 Difference]: With dead ends: 26 [2020-10-12 16:13:21,881 INFO L226 Difference]: Without dead ends: 19 [2020-10-12 16:13:21,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-10-12 16:13:21,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-12 16:13:21,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-12 16:13:21,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-12 16:13:21,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-10-12 16:13:21,891 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-10-12 16:13:21,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:21,891 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-10-12 16:13:21,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-12 16:13:21,892 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-10-12 16:13:21,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-12 16:13:21,893 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:21,893 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:21,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-12 16:13:21,894 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:21,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:21,894 INFO L82 PathProgramCache]: Analyzing trace with hash 845983764, now seen corresponding path program 4 times [2020-10-12 16:13:21,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:21,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086076877] [2020-10-12 16:13:21,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:21,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:21,928 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:21,960 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:22,145 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:22,146 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-12 16:13:22,146 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:22,146 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 241 [2020-10-12 16:13:22,146 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:22,147 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-12 16:13:22,147 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:22,147 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-12 16:13:22,147 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:22,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:22,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:22,336 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:22,337 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:22,338 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:22,338 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:22,338 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:22,338 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:22,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:22,339 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:22,339 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:22,339 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:22,342 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:22,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086076877] [2020-10-12 16:13:22,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:22,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-12 16:13:22,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580321682] [2020-10-12 16:13:22,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-12 16:13:22,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:22,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-12 16:13:22,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:13:22,348 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-10-12 16:13:22,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:22,561 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-10-12 16:13:22,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-12 16:13:22,562 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-10-12 16:13:22,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:22,563 INFO L225 Difference]: With dead ends: 27 [2020-10-12 16:13:22,563 INFO L226 Difference]: Without dead ends: 20 [2020-10-12 16:13:22,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-10-12 16:13:22,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-12 16:13:22,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-12 16:13:22,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-12 16:13:22,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-10-12 16:13:22,572 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-10-12 16:13:22,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:22,574 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-10-12 16:13:22,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-12 16:13:22,574 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-10-12 16:13:22,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-12 16:13:22,575 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:22,575 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:22,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-12 16:13:22,576 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:22,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:22,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1605833098, now seen corresponding path program 5 times [2020-10-12 16:13:22,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:22,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238793258] [2020-10-12 16:13:22,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:22,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:22,597 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:22,648 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:22,808 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:22,808 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-12 16:13:22,809 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:22,809 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 217 [2020-10-12 16:13:22,809 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:22,809 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-12 16:13:22,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:22,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-12 16:13:22,810 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:22,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:22,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:22,977 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:22,978 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:22,978 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:22,979 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:22,979 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:22,979 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:22,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:22,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:22,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:22,980 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:22,984 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:22,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238793258] [2020-10-12 16:13:22,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:22,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-12 16:13:22,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474382798] [2020-10-12 16:13:22,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-12 16:13:22,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:22,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-12 16:13:22,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-10-12 16:13:22,988 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-10-12 16:13:23,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:23,219 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-10-12 16:13:23,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-12 16:13:23,219 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-10-12 16:13:23,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:23,220 INFO L225 Difference]: With dead ends: 28 [2020-10-12 16:13:23,220 INFO L226 Difference]: Without dead ends: 21 [2020-10-12 16:13:23,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2020-10-12 16:13:23,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-12 16:13:23,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-12 16:13:23,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-12 16:13:23,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-10-12 16:13:23,227 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-10-12 16:13:23,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:23,227 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-10-12 16:13:23,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-12 16:13:23,227 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-10-12 16:13:23,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-12 16:13:23,228 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:23,228 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:23,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-12 16:13:23,229 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:23,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:23,229 INFO L82 PathProgramCache]: Analyzing trace with hash -302744492, now seen corresponding path program 6 times [2020-10-12 16:13:23,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:23,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061910612] [2020-10-12 16:13:23,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:23,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:23,246 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:23,341 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:23,365 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:23,365 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-12 16:13:23,365 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 124 [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-12 16:13:23,366 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:23,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:23,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:23,535 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:23,537 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:23,538 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:23,538 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:23,538 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-12 16:13:23,538 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:23,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:23,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:23,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:23,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:23,542 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:23,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061910612] [2020-10-12 16:13:23,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:23,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-12 16:13:23,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187132353] [2020-10-12 16:13:23,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-12 16:13:23,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:23,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-12 16:13:23,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-10-12 16:13:23,544 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-10-12 16:13:23,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:23,787 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-10-12 16:13:23,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-12 16:13:23,790 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-10-12 16:13:23,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:23,791 INFO L225 Difference]: With dead ends: 29 [2020-10-12 16:13:23,791 INFO L226 Difference]: Without dead ends: 22 [2020-10-12 16:13:23,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-10-12 16:13:23,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-10-12 16:13:23,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-10-12 16:13:23,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-12 16:13:23,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-10-12 16:13:23,798 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-10-12 16:13:23,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:23,799 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-10-12 16:13:23,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-12 16:13:23,799 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-10-12 16:13:23,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-12 16:13:23,800 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:23,800 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:23,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-12 16:13:23,800 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:23,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:23,800 INFO L82 PathProgramCache]: Analyzing trace with hash 1438296630, now seen corresponding path program 7 times [2020-10-12 16:13:23,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:23,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026258534] [2020-10-12 16:13:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:23,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:23,822 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:23,888 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:24,090 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:24,091 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-12 16:13:24,091 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:24,091 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 274 [2020-10-12 16:13:24,091 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:24,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-12 16:13:24,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:24,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-12 16:13:24,092 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:24,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:24,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:24,292 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:24,293 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:24,293 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:24,294 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:24,294 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:13:24,294 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:24,294 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:24,294 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:24,295 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:24,295 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:24,297 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:24,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026258534] [2020-10-12 16:13:24,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:24,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-12 16:13:24,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43235940] [2020-10-12 16:13:24,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-12 16:13:24,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:24,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-12 16:13:24,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-10-12 16:13:24,300 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-10-12 16:13:24,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:24,591 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-10-12 16:13:24,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-12 16:13:24,591 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-10-12 16:13:24,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:24,592 INFO L225 Difference]: With dead ends: 30 [2020-10-12 16:13:24,592 INFO L226 Difference]: Without dead ends: 23 [2020-10-12 16:13:24,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=527, Unknown=0, NotChecked=0, Total=600 [2020-10-12 16:13:24,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-12 16:13:24,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-12 16:13:24,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-12 16:13:24,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-10-12 16:13:24,598 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-10-12 16:13:24,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:24,599 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-10-12 16:13:24,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-12 16:13:24,599 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-10-12 16:13:24,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-12 16:13:24,600 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:24,600 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:24,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-12 16:13:24,600 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:24,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:24,600 INFO L82 PathProgramCache]: Analyzing trace with hash -424003436, now seen corresponding path program 8 times [2020-10-12 16:13:24,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:24,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894765826] [2020-10-12 16:13:24,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:24,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:24,617 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:24,686 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:24,801 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:24,801 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 190 [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:24,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-12 16:13:24,803 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:25,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:25,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:25,014 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:25,015 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:25,016 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:25,016 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:25,016 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:25,016 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:25,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:25,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:25,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:25,017 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:25,020 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:25,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894765826] [2020-10-12 16:13:25,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:25,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-12 16:13:25,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107471511] [2020-10-12 16:13:25,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-12 16:13:25,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:25,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-12 16:13:25,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-10-12 16:13:25,023 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-10-12 16:13:25,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:25,348 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-10-12 16:13:25,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-12 16:13:25,348 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-10-12 16:13:25,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:25,349 INFO L225 Difference]: With dead ends: 31 [2020-10-12 16:13:25,349 INFO L226 Difference]: Without dead ends: 24 [2020-10-12 16:13:25,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2020-10-12 16:13:25,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-12 16:13:25,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-12 16:13:25,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-12 16:13:25,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-10-12 16:13:25,355 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-10-12 16:13:25,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:25,356 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-10-12 16:13:25,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-12 16:13:25,356 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-10-12 16:13:25,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-12 16:13:25,357 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:25,357 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:25,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-12 16:13:25,357 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:25,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:25,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1974236662, now seen corresponding path program 9 times [2020-10-12 16:13:25,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:25,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106222461] [2020-10-12 16:13:25,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:25,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:25,373 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:25,509 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:25,538 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:25,538 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-12 16:13:25,538 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:25,539 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 170 [2020-10-12 16:13:25,539 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:25,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-12 16:13:25,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:25,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-12 16:13:25,540 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:25,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:25,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:25,761 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:25,762 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:25,762 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:25,762 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:25,762 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:25,763 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:25,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:25,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:25,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:25,764 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:25,766 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:25,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106222461] [2020-10-12 16:13:25,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:25,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-12 16:13:25,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855540382] [2020-10-12 16:13:25,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-12 16:13:25,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:25,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-12 16:13:25,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-10-12 16:13:25,768 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-10-12 16:13:26,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:26,126 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-10-12 16:13:26,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-12 16:13:26,127 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-10-12 16:13:26,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:26,128 INFO L225 Difference]: With dead ends: 32 [2020-10-12 16:13:26,128 INFO L226 Difference]: Without dead ends: 25 [2020-10-12 16:13:26,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2020-10-12 16:13:26,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-12 16:13:26,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-10-12 16:13:26,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-12 16:13:26,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-10-12 16:13:26,134 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-10-12 16:13:26,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:26,135 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-10-12 16:13:26,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-12 16:13:26,135 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-10-12 16:13:26,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-12 16:13:26,136 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:26,136 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:26,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-12 16:13:26,136 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:26,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:26,137 INFO L82 PathProgramCache]: Analyzing trace with hash -989731628, now seen corresponding path program 10 times [2020-10-12 16:13:26,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:26,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286844456] [2020-10-12 16:13:26,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:26,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:26,170 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:26,234 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:26,525 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:26,525 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-12 16:13:26,526 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:26,526 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 363 [2020-10-12 16:13:26,526 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:26,526 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-12 16:13:26,526 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:26,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-12 16:13:26,527 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:26,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:26,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:26,761 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:26,762 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:26,762 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:26,762 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:26,762 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:26,763 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:26,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:26,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:26,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:26,763 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:26,767 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:26,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286844456] [2020-10-12 16:13:26,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:26,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-12 16:13:26,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635004221] [2020-10-12 16:13:26,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-12 16:13:26,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:26,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-12 16:13:26,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-10-12 16:13:26,770 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-10-12 16:13:27,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:27,172 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-10-12 16:13:27,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-12 16:13:27,172 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-10-12 16:13:27,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:27,173 INFO L225 Difference]: With dead ends: 33 [2020-10-12 16:13:27,173 INFO L226 Difference]: Without dead ends: 26 [2020-10-12 16:13:27,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=839, Unknown=0, NotChecked=0, Total=930 [2020-10-12 16:13:27,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-12 16:13:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-12 16:13:27,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-12 16:13:27,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-12 16:13:27,183 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-10-12 16:13:27,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:27,183 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-12 16:13:27,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-12 16:13:27,184 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-12 16:13:27,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-12 16:13:27,184 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:27,184 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:27,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-12 16:13:27,185 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:27,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:27,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1616531894, now seen corresponding path program 11 times [2020-10-12 16:13:27,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:27,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313874235] [2020-10-12 16:13:27,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:27,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:27,202 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:27,298 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:27,601 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:27,601 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-12 16:13:27,601 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:27,601 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 404 [2020-10-12 16:13:27,602 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:27,602 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-10-12 16:13:27,602 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:27,602 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-12 16:13:27,602 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:27,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:27,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:27,880 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:27,881 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:27,881 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:27,882 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:27,882 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:27,882 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:27,882 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:27,883 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:27,883 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:27,883 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:27,886 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:27,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313874235] [2020-10-12 16:13:27,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:27,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-10-12 16:13:27,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598787943] [2020-10-12 16:13:27,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-12 16:13:27,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:27,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-12 16:13:27,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-10-12 16:13:27,889 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-10-12 16:13:28,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:28,476 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-10-12 16:13:28,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-12 16:13:28,477 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-10-12 16:13:28,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:28,477 INFO L225 Difference]: With dead ends: 34 [2020-10-12 16:13:28,478 INFO L226 Difference]: Without dead ends: 27 [2020-10-12 16:13:28,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=959, Unknown=0, NotChecked=0, Total=1056 [2020-10-12 16:13:28,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-12 16:13:28,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-10-12 16:13:28,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-12 16:13:28,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-10-12 16:13:28,491 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-10-12 16:13:28,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:28,492 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-10-12 16:13:28,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-12 16:13:28,492 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-10-12 16:13:28,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-12 16:13:28,493 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:28,493 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:28,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-12 16:13:28,494 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:28,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:28,495 INFO L82 PathProgramCache]: Analyzing trace with hash 806322452, now seen corresponding path program 12 times [2020-10-12 16:13:28,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:28,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722089848] [2020-10-12 16:13:28,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:28,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:28,523 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:28,732 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:28,845 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:28,845 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-10-12 16:13:28,845 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 330 [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-12 16:13:28,846 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:29,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:29,205 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:29,206 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:29,206 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:29,206 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:29,206 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:29,207 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:29,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:29,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:29,207 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:29,207 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:29,210 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:29,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722089848] [2020-10-12 16:13:29,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:29,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-10-12 16:13:29,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321591865] [2020-10-12 16:13:29,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-12 16:13:29,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:29,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-12 16:13:29,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-10-12 16:13:29,215 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-10-12 16:13:29,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:29,778 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-10-12 16:13:29,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-12 16:13:29,778 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-10-12 16:13:29,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:29,779 INFO L225 Difference]: With dead ends: 35 [2020-10-12 16:13:29,779 INFO L226 Difference]: Without dead ends: 28 [2020-10-12 16:13:29,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=103, Invalid=1087, Unknown=0, NotChecked=0, Total=1190 [2020-10-12 16:13:29,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-12 16:13:29,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-12 16:13:29,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-12 16:13:29,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-10-12 16:13:29,785 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-10-12 16:13:29,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:29,786 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-10-12 16:13:29,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-12 16:13:29,786 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-10-12 16:13:29,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-12 16:13:29,787 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:29,787 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:29,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-12 16:13:29,787 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:29,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:29,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1459633526, now seen corresponding path program 13 times [2020-10-12 16:13:29,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:29,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209162874] [2020-10-12 16:13:29,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:29,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:29,807 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:29,916 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:30,200 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:30,200 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-12 16:13:30,200 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:30,200 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 400 [2020-10-12 16:13:30,201 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:30,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-12 16:13:30,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:30,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-12 16:13:30,201 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:30,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:30,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:30,509 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:30,510 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:30,510 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:30,510 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:30,510 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:30,511 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:30,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:30,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:30,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:30,511 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:30,514 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:30,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209162874] [2020-10-12 16:13:30,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:30,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-10-12 16:13:30,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792952818] [2020-10-12 16:13:30,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-10-12 16:13:30,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:30,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-10-12 16:13:30,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-10-12 16:13:30,516 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-10-12 16:13:31,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:31,055 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-10-12 16:13:31,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-12 16:13:31,056 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-10-12 16:13:31,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:31,057 INFO L225 Difference]: With dead ends: 36 [2020-10-12 16:13:31,057 INFO L226 Difference]: Without dead ends: 29 [2020-10-12 16:13:31,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=1223, Unknown=0, NotChecked=0, Total=1332 [2020-10-12 16:13:31,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-12 16:13:31,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-10-12 16:13:31,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-12 16:13:31,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-10-12 16:13:31,063 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-10-12 16:13:31,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:31,064 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-10-12 16:13:31,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-10-12 16:13:31,064 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-10-12 16:13:31,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-12 16:13:31,065 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:31,065 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:31,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-12 16:13:31,065 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:31,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:31,065 INFO L82 PathProgramCache]: Analyzing trace with hash 237440340, now seen corresponding path program 14 times [2020-10-12 16:13:31,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:31,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604379739] [2020-10-12 16:13:31,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:31,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:31,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:31,218 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:31,448 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:31,448 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-12 16:13:31,449 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:31,449 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 368 [2020-10-12 16:13:31,449 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:31,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-10-12 16:13:31,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:31,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-12 16:13:31,450 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:31,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:31,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:31,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:31,787 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:31,787 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:31,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:31,789 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:31,791 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:31,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604379739] [2020-10-12 16:13:31,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:31,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-10-12 16:13:31,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154153783] [2020-10-12 16:13:31,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-12 16:13:31,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:31,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-12 16:13:31,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-10-12 16:13:31,794 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-10-12 16:13:32,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:32,332 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-10-12 16:13:32,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-12 16:13:32,333 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-10-12 16:13:32,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:32,333 INFO L225 Difference]: With dead ends: 37 [2020-10-12 16:13:32,333 INFO L226 Difference]: Without dead ends: 30 [2020-10-12 16:13:32,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=1367, Unknown=0, NotChecked=0, Total=1482 [2020-10-12 16:13:32,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-12 16:13:32,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-12 16:13:32,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-12 16:13:32,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-10-12 16:13:32,342 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-10-12 16:13:32,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:32,343 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-10-12 16:13:32,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-12 16:13:32,343 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-10-12 16:13:32,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-12 16:13:32,345 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:32,345 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:32,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-12 16:13:32,345 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:32,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:32,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1004157238, now seen corresponding path program 15 times [2020-10-12 16:13:32,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:32,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1130272572] [2020-10-12 16:13:32,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:32,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:32,366 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:32,495 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:32,784 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:32,784 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-12 16:13:32,784 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 425 [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-12 16:13:32,785 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:33,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:33,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:33,183 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:33,184 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:33,185 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:33,185 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:33,185 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:33,185 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:33,186 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:33,186 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:33,186 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:33,186 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:33,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1130272572] [2020-10-12 16:13:33,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:33,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-12 16:13:33,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66471963] [2020-10-12 16:13:33,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-12 16:13:33,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:33,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-12 16:13:33,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-10-12 16:13:33,192 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-10-12 16:13:33,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:33,812 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-10-12 16:13:33,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-12 16:13:33,812 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-10-12 16:13:33,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:33,813 INFO L225 Difference]: With dead ends: 38 [2020-10-12 16:13:33,813 INFO L226 Difference]: Without dead ends: 31 [2020-10-12 16:13:33,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=1519, Unknown=0, NotChecked=0, Total=1640 [2020-10-12 16:13:33,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-12 16:13:33,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-10-12 16:13:33,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-12 16:13:33,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-12 16:13:33,827 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-10-12 16:13:33,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:33,827 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-12 16:13:33,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-12 16:13:33,827 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-12 16:13:33,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-12 16:13:33,828 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:33,831 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:33,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-12 16:13:33,832 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:33,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:33,832 INFO L82 PathProgramCache]: Analyzing trace with hash -997422700, now seen corresponding path program 16 times [2020-10-12 16:13:33,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:33,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433087065] [2020-10-12 16:13:33,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:33,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:33,852 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:34,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:34,507 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:34,508 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-12 16:13:34,508 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:34,508 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 663 [2020-10-12 16:13:34,509 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:34,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-12 16:13:34,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:34,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 25 [2020-10-12 16:13:34,509 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:34,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:34,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:34,904 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:34,906 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:34,907 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:34,907 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:34,907 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:13:34,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:34,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:34,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:34,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:34,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:34,911 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:34,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433087065] [2020-10-12 16:13:34,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:34,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-12 16:13:34,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300243430] [2020-10-12 16:13:34,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-12 16:13:34,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:34,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-12 16:13:34,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-10-12 16:13:34,918 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-10-12 16:13:35,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:35,584 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-10-12 16:13:35,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-12 16:13:35,584 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-10-12 16:13:35,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:35,585 INFO L225 Difference]: With dead ends: 39 [2020-10-12 16:13:35,586 INFO L226 Difference]: Without dead ends: 32 [2020-10-12 16:13:35,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=127, Invalid=1679, Unknown=0, NotChecked=0, Total=1806 [2020-10-12 16:13:35,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-12 16:13:35,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-12 16:13:35,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-12 16:13:35,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-10-12 16:13:35,593 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-10-12 16:13:35,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:35,593 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-10-12 16:13:35,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-12 16:13:35,593 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-10-12 16:13:35,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-12 16:13:35,594 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:35,594 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:35,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-12 16:13:35,594 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:35,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:35,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1378108662, now seen corresponding path program 17 times [2020-10-12 16:13:35,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:35,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378011545] [2020-10-12 16:13:35,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:35,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:35,614 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:35,746 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:36,205 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:36,205 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-12 16:13:36,205 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:36,205 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 598 [2020-10-12 16:13:36,206 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:36,206 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 22 [2020-10-12 16:13:36,206 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:36,206 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-12 16:13:36,206 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:36,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:36,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:36,579 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:36,580 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:36,580 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:36,580 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:36,581 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:36,584 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:36,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378011545] [2020-10-12 16:13:36,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:36,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-10-12 16:13:36,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050852123] [2020-10-12 16:13:36,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-12 16:13:36,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:36,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-12 16:13:36,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-10-12 16:13:36,588 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-10-12 16:13:37,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:37,344 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-10-12 16:13:37,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-12 16:13:37,345 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-10-12 16:13:37,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:37,345 INFO L225 Difference]: With dead ends: 40 [2020-10-12 16:13:37,346 INFO L226 Difference]: Without dead ends: 33 [2020-10-12 16:13:37,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=1847, Unknown=0, NotChecked=0, Total=1980 [2020-10-12 16:13:37,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-12 16:13:37,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-10-12 16:13:37,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-12 16:13:37,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-10-12 16:13:37,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-10-12 16:13:37,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:37,354 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-10-12 16:13:37,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-12 16:13:37,355 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-10-12 16:13:37,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-12 16:13:37,356 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:37,357 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:37,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-12 16:13:37,357 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:37,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:37,357 INFO L82 PathProgramCache]: Analyzing trace with hash 2005136852, now seen corresponding path program 18 times [2020-10-12 16:13:37,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:37,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523794981] [2020-10-12 16:13:37,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:37,382 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:37,603 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:38,094 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:38,094 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-12 16:13:38,094 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 721 [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 23 [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 27 [2020-10-12 16:13:38,095 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:38,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:38,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:38,562 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:38,563 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:38,563 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:38,563 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:38,563 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:38,563 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:38,564 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:38,564 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:38,564 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:38,564 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:38,567 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:38,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523794981] [2020-10-12 16:13:38,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:38,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-10-12 16:13:38,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772612367] [2020-10-12 16:13:38,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-12 16:13:38,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:38,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-12 16:13:38,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-10-12 16:13:38,569 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-10-12 16:13:39,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:39,345 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-10-12 16:13:39,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-12 16:13:39,345 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-10-12 16:13:39,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:39,346 INFO L225 Difference]: With dead ends: 41 [2020-10-12 16:13:39,346 INFO L226 Difference]: Without dead ends: 34 [2020-10-12 16:13:39,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=139, Invalid=2023, Unknown=0, NotChecked=0, Total=2162 [2020-10-12 16:13:39,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-12 16:13:39,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-10-12 16:13:39,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-12 16:13:39,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-10-12 16:13:39,356 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-10-12 16:13:39,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:39,356 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-10-12 16:13:39,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-12 16:13:39,357 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-10-12 16:13:39,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-12 16:13:39,357 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:39,357 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:39,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-12 16:13:39,358 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:39,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:39,359 INFO L82 PathProgramCache]: Analyzing trace with hash -31825738, now seen corresponding path program 19 times [2020-10-12 16:13:39,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:39,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017294891] [2020-10-12 16:13:39,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:39,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:39,379 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:39,699 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:39,770 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:39,770 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-12 16:13:39,770 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:39,770 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 398 [2020-10-12 16:13:39,771 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:39,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 24 [2020-10-12 16:13:39,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:39,771 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-12 16:13:39,771 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:40,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:40,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:40,219 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:40,220 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:40,220 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:40,220 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:40,221 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:40,227 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:40,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017294891] [2020-10-12 16:13:40,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:40,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-10-12 16:13:40,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902052732] [2020-10-12 16:13:40,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-12 16:13:40,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:40,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-12 16:13:40,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-10-12 16:13:40,230 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-10-12 16:13:41,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:41,143 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-10-12 16:13:41,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-10-12 16:13:41,145 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-10-12 16:13:41,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:41,146 INFO L225 Difference]: With dead ends: 42 [2020-10-12 16:13:41,146 INFO L226 Difference]: Without dead ends: 35 [2020-10-12 16:13:41,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=145, Invalid=2207, Unknown=0, NotChecked=0, Total=2352 [2020-10-12 16:13:41,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-12 16:13:41,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-10-12 16:13:41,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-12 16:13:41,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-10-12 16:13:41,152 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-10-12 16:13:41,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:41,152 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-10-12 16:13:41,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-12 16:13:41,153 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-10-12 16:13:41,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-12 16:13:41,153 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:41,153 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:41,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-12 16:13:41,154 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:41,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:41,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1246843412, now seen corresponding path program 20 times [2020-10-12 16:13:41,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:41,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055636950] [2020-10-12 16:13:41,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:41,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:41,174 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:41,510 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:41,771 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:41,771 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-12 16:13:41,771 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:41,772 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 605 [2020-10-12 16:13:41,772 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:41,772 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 25 [2020-10-12 16:13:41,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:41,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 29 [2020-10-12 16:13:41,773 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:42,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:42,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:42,438 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:42,439 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:42,439 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:42,439 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:42,440 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:42,440 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:42,440 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:42,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:42,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:42,441 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:42,447 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:42,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055636950] [2020-10-12 16:13:42,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:42,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-10-12 16:13:42,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998915940] [2020-10-12 16:13:42,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-10-12 16:13:42,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:42,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-10-12 16:13:42,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-10-12 16:13:42,450 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-10-12 16:13:43,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:43,442 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-10-12 16:13:43,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-12 16:13:43,445 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-10-12 16:13:43,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:43,446 INFO L225 Difference]: With dead ends: 43 [2020-10-12 16:13:43,446 INFO L226 Difference]: Without dead ends: 36 [2020-10-12 16:13:43,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=151, Invalid=2399, Unknown=0, NotChecked=0, Total=2550 [2020-10-12 16:13:43,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-12 16:13:43,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-10-12 16:13:43,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-12 16:13:43,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-10-12 16:13:43,451 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-10-12 16:13:43,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:43,452 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-10-12 16:13:43,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-10-12 16:13:43,452 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-10-12 16:13:43,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-12 16:13:43,452 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:43,453 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:43,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-12 16:13:43,453 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:43,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:43,453 INFO L82 PathProgramCache]: Analyzing trace with hash -2064085898, now seen corresponding path program 21 times [2020-10-12 16:13:43,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:43,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462781851] [2020-10-12 16:13:43,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:43,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:43,473 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:43,844 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:44,055 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:44,055 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-10-12 16:13:44,055 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:44,055 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 590 [2020-10-12 16:13:44,056 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:44,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-12 16:13:44,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:44,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-10-12 16:13:44,056 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:44,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:44,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:44,623 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:44,623 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:44,623 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:44,623 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:44,624 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:44,628 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:44,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462781851] [2020-10-12 16:13:44,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:44,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-12 16:13:44,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167615020] [2020-10-12 16:13:44,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-12 16:13:44,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:44,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-12 16:13:44,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-10-12 16:13:44,634 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-10-12 16:13:45,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:45,661 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-10-12 16:13:45,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-12 16:13:45,662 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-10-12 16:13:45,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:45,662 INFO L225 Difference]: With dead ends: 44 [2020-10-12 16:13:45,663 INFO L226 Difference]: Without dead ends: 37 [2020-10-12 16:13:45,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=157, Invalid=2599, Unknown=0, NotChecked=0, Total=2756 [2020-10-12 16:13:45,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-12 16:13:45,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-10-12 16:13:45,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-12 16:13:45,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-10-12 16:13:45,670 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-10-12 16:13:45,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:45,670 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-10-12 16:13:45,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-12 16:13:45,670 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-10-12 16:13:45,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-12 16:13:45,670 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:45,670 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:45,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-12 16:13:45,671 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:45,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:45,671 INFO L82 PathProgramCache]: Analyzing trace with hash -1623679404, now seen corresponding path program 22 times [2020-10-12 16:13:45,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:45,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896118546] [2020-10-12 16:13:45,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:45,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:45,686 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:46,062 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:46,273 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:46,273 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-12 16:13:46,274 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:46,274 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 592 [2020-10-12 16:13:46,274 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:46,274 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 27 [2020-10-12 16:13:46,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:46,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-12 16:13:46,275 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:46,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:46,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:46,888 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:46,888 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:46,889 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:46,892 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:46,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896118546] [2020-10-12 16:13:46,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:46,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-10-12 16:13:46,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736164944] [2020-10-12 16:13:46,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-10-12 16:13:46,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:46,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-10-12 16:13:46,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-10-12 16:13:46,894 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-10-12 16:13:48,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:48,058 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-10-12 16:13:48,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-12 16:13:48,059 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-10-12 16:13:48,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:48,060 INFO L225 Difference]: With dead ends: 45 [2020-10-12 16:13:48,060 INFO L226 Difference]: Without dead ends: 38 [2020-10-12 16:13:48,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=163, Invalid=2807, Unknown=0, NotChecked=0, Total=2970 [2020-10-12 16:13:48,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-12 16:13:48,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-10-12 16:13:48,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-12 16:13:48,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-10-12 16:13:48,066 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-10-12 16:13:48,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:48,067 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-10-12 16:13:48,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-10-12 16:13:48,069 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-10-12 16:13:48,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-12 16:13:48,069 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:48,070 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:48,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-10-12 16:13:48,070 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:48,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:48,070 INFO L82 PathProgramCache]: Analyzing trace with hash -855979978, now seen corresponding path program 23 times [2020-10-12 16:13:48,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:48,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399111118] [2020-10-12 16:13:48,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:48,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:48,091 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:48,477 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:48,717 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:48,717 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-10-12 16:13:48,717 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:48,717 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 634 [2020-10-12 16:13:48,718 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:48,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 28 [2020-10-12 16:13:48,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:48,718 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-10-12 16:13:48,718 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:49,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:49,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:49,401 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:49,401 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:49,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:49,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:49,403 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:49,406 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:49,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399111118] [2020-10-12 16:13:49,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:49,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-10-12 16:13:49,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408878690] [2020-10-12 16:13:49,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-12 16:13:49,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:49,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-12 16:13:49,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-10-12 16:13:49,409 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-10-12 16:13:50,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:50,601 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-10-12 16:13:50,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-12 16:13:50,602 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-10-12 16:13:50,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:50,602 INFO L225 Difference]: With dead ends: 46 [2020-10-12 16:13:50,603 INFO L226 Difference]: Without dead ends: 39 [2020-10-12 16:13:50,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=169, Invalid=3023, Unknown=0, NotChecked=0, Total=3192 [2020-10-12 16:13:50,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-12 16:13:50,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-12 16:13:50,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-12 16:13:50,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-10-12 16:13:50,609 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-10-12 16:13:50,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:50,609 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-10-12 16:13:50,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-12 16:13:50,610 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-10-12 16:13:50,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-10-12 16:13:50,610 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:50,610 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:50,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-10-12 16:13:50,611 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:50,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:50,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1467865748, now seen corresponding path program 24 times [2020-10-12 16:13:50,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:50,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875491175] [2020-10-12 16:13:50,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:50,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:50,632 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:51,099 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:51,246 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:51,246 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 46 [2020-10-12 16:13:51,246 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:51,246 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 622 [2020-10-12 16:13:51,247 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:51,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 29 [2020-10-12 16:13:51,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:51,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-12 16:13:51,247 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:51,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:51,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:51,984 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:51,985 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:51,985 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:51,985 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:51,986 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:51,986 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:51,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:51,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:51,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:51,987 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:51,990 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:51,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875491175] [2020-10-12 16:13:51,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:51,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-10-12 16:13:51,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888978928] [2020-10-12 16:13:51,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-10-12 16:13:51,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:51,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-10-12 16:13:51,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-10-12 16:13:51,993 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-10-12 16:13:53,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:53,251 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-10-12 16:13:53,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-10-12 16:13:53,251 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-10-12 16:13:53,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:53,252 INFO L225 Difference]: With dead ends: 47 [2020-10-12 16:13:53,252 INFO L226 Difference]: Without dead ends: 40 [2020-10-12 16:13:53,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=175, Invalid=3247, Unknown=0, NotChecked=0, Total=3422 [2020-10-12 16:13:53,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-12 16:13:53,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-10-12 16:13:53,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-12 16:13:53,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-10-12 16:13:53,258 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-10-12 16:13:53,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:53,259 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-10-12 16:13:53,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-10-12 16:13:53,259 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-10-12 16:13:53,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-12 16:13:53,259 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:53,259 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:53,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-10-12 16:13:53,260 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:53,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:53,260 INFO L82 PathProgramCache]: Analyzing trace with hash 492639222, now seen corresponding path program 25 times [2020-10-12 16:13:53,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:53,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024001670] [2020-10-12 16:13:53,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:53,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:53,280 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:53,644 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:53,768 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:53,769 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 47 [2020-10-12 16:13:53,769 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:53,769 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 493 [2020-10-12 16:13:53,769 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:53,769 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 30 [2020-10-12 16:13:53,770 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:53,770 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-12 16:13:53,770 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:54,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:54,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:54,408 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:54,409 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:54,410 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:54,410 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:54,410 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:54,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024001670] [2020-10-12 16:13:54,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:54,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-10-12 16:13:54,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879582762] [2020-10-12 16:13:54,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-10-12 16:13:54,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:54,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-10-12 16:13:54,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-10-12 16:13:54,416 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-10-12 16:13:55,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:55,742 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-10-12 16:13:55,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-10-12 16:13:55,743 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-10-12 16:13:55,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:55,744 INFO L225 Difference]: With dead ends: 48 [2020-10-12 16:13:55,744 INFO L226 Difference]: Without dead ends: 41 [2020-10-12 16:13:55,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=181, Invalid=3479, Unknown=0, NotChecked=0, Total=3660 [2020-10-12 16:13:55,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-12 16:13:55,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-12 16:13:55,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-12 16:13:55,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-10-12 16:13:55,749 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-10-12 16:13:55,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:55,750 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-10-12 16:13:55,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-10-12 16:13:55,750 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-10-12 16:13:55,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-12 16:13:55,750 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:55,750 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:55,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-10-12 16:13:55,751 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:55,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:55,751 INFO L82 PathProgramCache]: Analyzing trace with hash 325387988, now seen corresponding path program 26 times [2020-10-12 16:13:55,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:55,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29965448] [2020-10-12 16:13:55,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:55,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:55,768 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:56,180 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:56,374 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:56,375 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-12 16:13:56,375 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:56,375 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 612 [2020-10-12 16:13:56,375 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:56,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 31 [2020-10-12 16:13:56,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:56,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-12 16:13:56,376 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:13:57,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:13:57,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:57,168 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:13:57,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:13:57,170 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:13:57,170 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:13:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:13:57,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29965448] [2020-10-12 16:13:57,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:13:57,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-10-12 16:13:57,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845310088] [2020-10-12 16:13:57,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-10-12 16:13:57,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:13:57,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-10-12 16:13:57,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-10-12 16:13:57,174 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-10-12 16:13:58,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:13:58,629 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-10-12 16:13:58,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-12 16:13:58,629 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-10-12 16:13:58,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:13:58,630 INFO L225 Difference]: With dead ends: 49 [2020-10-12 16:13:58,630 INFO L226 Difference]: Without dead ends: 42 [2020-10-12 16:13:58,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=187, Invalid=3719, Unknown=0, NotChecked=0, Total=3906 [2020-10-12 16:13:58,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-12 16:13:58,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-10-12 16:13:58,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-12 16:13:58,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-10-12 16:13:58,639 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-10-12 16:13:58,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:13:58,641 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-10-12 16:13:58,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-10-12 16:13:58,641 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-10-12 16:13:58,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-12 16:13:58,641 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:13:58,642 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:13:58,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-10-12 16:13:58,642 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:13:58,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:13:58,642 INFO L82 PathProgramCache]: Analyzing trace with hash -564432970, now seen corresponding path program 27 times [2020-10-12 16:13:58,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:13:58,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472832745] [2020-10-12 16:13:58,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:13:58,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:13:58,669 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:58,992 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:13:59,527 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:13:59,528 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 49 [2020-10-12 16:13:59,528 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:13:59,528 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 869 [2020-10-12 16:13:59,529 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:13:59,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 32 [2020-10-12 16:13:59,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:13:59,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-10-12 16:13:59,530 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:14:00,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:00,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:00,385 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:00,386 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:00,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:00,388 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:00,391 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:00,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472832745] [2020-10-12 16:14:00,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:00,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-10-12 16:14:00,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172254591] [2020-10-12 16:14:00,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-10-12 16:14:00,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:00,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-10-12 16:14:00,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-10-12 16:14:00,393 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-10-12 16:14:01,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:01,967 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-10-12 16:14:01,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-10-12 16:14:01,967 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-10-12 16:14:01,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:01,968 INFO L225 Difference]: With dead ends: 50 [2020-10-12 16:14:01,968 INFO L226 Difference]: Without dead ends: 43 [2020-10-12 16:14:01,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=193, Invalid=3967, Unknown=0, NotChecked=0, Total=4160 [2020-10-12 16:14:01,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-12 16:14:01,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-10-12 16:14:01,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-12 16:14:01,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-10-12 16:14:01,977 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-10-12 16:14:01,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:01,978 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-10-12 16:14:01,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-10-12 16:14:01,978 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-10-12 16:14:01,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-12 16:14:01,978 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:01,979 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:01,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-10-12 16:14:01,979 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:01,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:01,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1915888404, now seen corresponding path program 28 times [2020-10-12 16:14:01,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:01,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051912671] [2020-10-12 16:14:01,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:01,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:02,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:02,557 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:02,588 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:02,588 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-12 16:14:02,588 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:02,588 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 588 [2020-10-12 16:14:02,589 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:02,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-12 16:14:02,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:02,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 37 [2020-10-12 16:14:02,589 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:03,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:03,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:03,485 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:03,485 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:03,485 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:03,486 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:03,489 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:03,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051912671] [2020-10-12 16:14:03,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:03,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-12 16:14:03,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347478226] [2020-10-12 16:14:03,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-12 16:14:03,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:03,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-12 16:14:03,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-10-12 16:14:03,493 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-10-12 16:14:05,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:05,140 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-10-12 16:14:05,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-12 16:14:05,141 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-10-12 16:14:05,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:05,142 INFO L225 Difference]: With dead ends: 51 [2020-10-12 16:14:05,142 INFO L226 Difference]: Without dead ends: 44 [2020-10-12 16:14:05,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=199, Invalid=4223, Unknown=0, NotChecked=0, Total=4422 [2020-10-12 16:14:05,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-12 16:14:05,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-10-12 16:14:05,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-12 16:14:05,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-10-12 16:14:05,152 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-10-12 16:14:05,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:05,152 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-10-12 16:14:05,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-12 16:14:05,153 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-10-12 16:14:05,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-12 16:14:05,153 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:05,153 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:05,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-10-12 16:14:05,153 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:05,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:05,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1496439670, now seen corresponding path program 29 times [2020-10-12 16:14:05,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:05,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879492501] [2020-10-12 16:14:05,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:05,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:05,173 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:05,595 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:05,636 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 51 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 469 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 34 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 38 [2020-10-12 16:14:05,637 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:06,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:06,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:06,561 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:06,562 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:06,563 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:06,563 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:06,566 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:06,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879492501] [2020-10-12 16:14:06,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:06,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-10-12 16:14:06,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528987757] [2020-10-12 16:14:06,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-10-12 16:14:06,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:06,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-10-12 16:14:06,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-10-12 16:14:06,568 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-10-12 16:14:08,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:08,302 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-10-12 16:14:08,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-10-12 16:14:08,305 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-10-12 16:14:08,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:08,306 INFO L225 Difference]: With dead ends: 52 [2020-10-12 16:14:08,306 INFO L226 Difference]: Without dead ends: 45 [2020-10-12 16:14:08,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=205, Invalid=4487, Unknown=0, NotChecked=0, Total=4692 [2020-10-12 16:14:08,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-12 16:14:08,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-10-12 16:14:08,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-12 16:14:08,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-10-12 16:14:08,311 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-10-12 16:14:08,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:08,311 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-10-12 16:14:08,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-10-12 16:14:08,312 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-10-12 16:14:08,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-12 16:14:08,312 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:08,312 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:08,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-10-12 16:14:08,312 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:08,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:08,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1378430804, now seen corresponding path program 30 times [2020-10-12 16:14:08,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:08,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95782068] [2020-10-12 16:14:08,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:08,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:08,336 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:08,713 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:09,405 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:09,406 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-12 16:14:09,406 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:09,406 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1076 [2020-10-12 16:14:09,406 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:09,406 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 35 [2020-10-12 16:14:09,407 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:09,407 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 39 [2020-10-12 16:14:09,407 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:10,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:10,385 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:10,386 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:10,386 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:10,387 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:10,387 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:10,387 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:10,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:10,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:10,388 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:10,388 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:10,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95782068] [2020-10-12 16:14:10,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:10,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-10-12 16:14:10,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41370299] [2020-10-12 16:14:10,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-10-12 16:14:10,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:10,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-10-12 16:14:10,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-10-12 16:14:10,395 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-10-12 16:14:12,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:12,257 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-10-12 16:14:12,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-12 16:14:12,258 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-10-12 16:14:12,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:12,259 INFO L225 Difference]: With dead ends: 53 [2020-10-12 16:14:12,259 INFO L226 Difference]: Without dead ends: 46 [2020-10-12 16:14:12,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=211, Invalid=4759, Unknown=0, NotChecked=0, Total=4970 [2020-10-12 16:14:12,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-12 16:14:12,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-10-12 16:14:12,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-12 16:14:12,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-10-12 16:14:12,265 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-10-12 16:14:12,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:12,265 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-10-12 16:14:12,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-10-12 16:14:12,266 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-10-12 16:14:12,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-12 16:14:12,266 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:12,266 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:12,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-10-12 16:14:12,267 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:12,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:12,267 INFO L82 PathProgramCache]: Analyzing trace with hash 2015123254, now seen corresponding path program 31 times [2020-10-12 16:14:12,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:12,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407796387] [2020-10-12 16:14:12,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:12,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:12,288 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:12,744 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1160 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 36 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:13,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-10-12 16:14:13,442 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:14,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:14,463 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:14,464 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:14,464 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:14,464 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:14,465 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:14,469 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:14,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407796387] [2020-10-12 16:14:14,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:14,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-10-12 16:14:14,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464126053] [2020-10-12 16:14:14,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-12 16:14:14,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:14,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-12 16:14:14,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-10-12 16:14:14,471 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-10-12 16:14:16,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:16,376 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-10-12 16:14:16,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-12 16:14:16,376 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-10-12 16:14:16,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:16,377 INFO L225 Difference]: With dead ends: 54 [2020-10-12 16:14:16,377 INFO L226 Difference]: Without dead ends: 47 [2020-10-12 16:14:16,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=217, Invalid=5039, Unknown=0, NotChecked=0, Total=5256 [2020-10-12 16:14:16,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-12 16:14:16,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-10-12 16:14:16,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-12 16:14:16,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-10-12 16:14:16,383 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-10-12 16:14:16,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:16,384 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-10-12 16:14:16,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-12 16:14:16,384 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-10-12 16:14:16,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-12 16:14:16,384 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:16,385 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:16,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-10-12 16:14:16,385 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:16,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:16,385 INFO L82 PathProgramCache]: Analyzing trace with hash 277752724, now seen corresponding path program 32 times [2020-10-12 16:14:16,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:16,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1627350786] [2020-10-12 16:14:16,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:16,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:16,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:16,892 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:17,038 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:17,038 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 54 [2020-10-12 16:14:17,038 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:17,038 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 636 [2020-10-12 16:14:17,039 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:17,039 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 37 [2020-10-12 16:14:17,039 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:17,039 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 41 [2020-10-12 16:14:17,039 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:18,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:18,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:18,117 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:18,117 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:18,117 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:18,118 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:18,122 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:18,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1627350786] [2020-10-12 16:14:18,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:18,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-10-12 16:14:18,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744704974] [2020-10-12 16:14:18,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-10-12 16:14:18,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:18,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-10-12 16:14:18,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-10-12 16:14:18,124 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-10-12 16:14:20,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:20,184 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-10-12 16:14:20,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-10-12 16:14:20,185 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-10-12 16:14:20,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:20,185 INFO L225 Difference]: With dead ends: 55 [2020-10-12 16:14:20,186 INFO L226 Difference]: Without dead ends: 48 [2020-10-12 16:14:20,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=223, Invalid=5327, Unknown=0, NotChecked=0, Total=5550 [2020-10-12 16:14:20,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-12 16:14:20,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-10-12 16:14:20,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-10-12 16:14:20,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-10-12 16:14:20,192 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-10-12 16:14:20,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:20,192 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-10-12 16:14:20,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-10-12 16:14:20,192 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-10-12 16:14:20,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-12 16:14:20,193 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:20,193 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:20,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-10-12 16:14:20,193 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:20,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:20,194 INFO L82 PathProgramCache]: Analyzing trace with hash -2041126154, now seen corresponding path program 33 times [2020-10-12 16:14:20,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:20,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395834143] [2020-10-12 16:14:20,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:20,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:20,214 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:20,553 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:21,547 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:21,547 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 55 [2020-10-12 16:14:21,547 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:21,547 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1341 [2020-10-12 16:14:21,547 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:21,548 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 38 [2020-10-12 16:14:21,548 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:21,548 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 42 [2020-10-12 16:14:21,548 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:22,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:22,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:22,702 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:22,702 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:22,703 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:22,707 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:22,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395834143] [2020-10-12 16:14:22,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:22,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-10-12 16:14:22,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126776784] [2020-10-12 16:14:22,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-10-12 16:14:22,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:22,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-10-12 16:14:22,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-10-12 16:14:22,709 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-10-12 16:14:24,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:24,830 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-10-12 16:14:24,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-10-12 16:14:24,830 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-10-12 16:14:24,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:24,831 INFO L225 Difference]: With dead ends: 56 [2020-10-12 16:14:24,831 INFO L226 Difference]: Without dead ends: 49 [2020-10-12 16:14:24,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=229, Invalid=5623, Unknown=0, NotChecked=0, Total=5852 [2020-10-12 16:14:24,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-10-12 16:14:24,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-10-12 16:14:24,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-10-12 16:14:24,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-10-12 16:14:24,837 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-10-12 16:14:24,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:24,837 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-10-12 16:14:24,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-10-12 16:14:24,837 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-10-12 16:14:24,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-12 16:14:24,838 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:24,838 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:24,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-10-12 16:14:24,838 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:24,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:24,839 INFO L82 PathProgramCache]: Analyzing trace with hash -911927340, now seen corresponding path program 34 times [2020-10-12 16:14:24,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:24,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798130733] [2020-10-12 16:14:24,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:24,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:24,865 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:25,291 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:26,282 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 56 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1426 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 39 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 43 [2020-10-12 16:14:26,283 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:27,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:27,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:27,497 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:27,497 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:27,497 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:27,498 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:27,502 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:27,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798130733] [2020-10-12 16:14:27,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:27,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-10-12 16:14:27,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144821280] [2020-10-12 16:14:27,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-10-12 16:14:27,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:27,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-10-12 16:14:27,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-10-12 16:14:27,504 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-10-12 16:14:29,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:29,824 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-10-12 16:14:29,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-10-12 16:14:29,825 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-10-12 16:14:29,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:29,826 INFO L225 Difference]: With dead ends: 57 [2020-10-12 16:14:29,826 INFO L226 Difference]: Without dead ends: 50 [2020-10-12 16:14:29,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=235, Invalid=5927, Unknown=0, NotChecked=0, Total=6162 [2020-10-12 16:14:29,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-10-12 16:14:29,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-10-12 16:14:29,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-12 16:14:29,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-10-12 16:14:29,832 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-10-12 16:14:29,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:29,832 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-10-12 16:14:29,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-10-12 16:14:29,832 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-10-12 16:14:29,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-12 16:14:29,833 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:29,833 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:29,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-10-12 16:14:29,833 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:29,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:29,833 INFO L82 PathProgramCache]: Analyzing trace with hash -266502474, now seen corresponding path program 35 times [2020-10-12 16:14:29,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:29,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216873574] [2020-10-12 16:14:29,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:29,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:29,864 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:30,582 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:30,640 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 790 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 40 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-10-12 16:14:30,641 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:31,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:31,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:31,875 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:31,875 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:31,876 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:31,877 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:31,882 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:31,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216873574] [2020-10-12 16:14:31,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:31,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-10-12 16:14:31,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99244609] [2020-10-12 16:14:31,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-10-12 16:14:31,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:31,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-10-12 16:14:31,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-10-12 16:14:31,884 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-10-12 16:14:34,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:34,259 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-10-12 16:14:34,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-10-12 16:14:34,260 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-10-12 16:14:34,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:34,261 INFO L225 Difference]: With dead ends: 58 [2020-10-12 16:14:34,261 INFO L226 Difference]: Without dead ends: 51 [2020-10-12 16:14:34,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=241, Invalid=6239, Unknown=0, NotChecked=0, Total=6480 [2020-10-12 16:14:34,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-12 16:14:34,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-10-12 16:14:34,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-12 16:14:34,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-10-12 16:14:34,267 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-10-12 16:14:34,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:34,267 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-10-12 16:14:34,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-10-12 16:14:34,267 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-10-12 16:14:34,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-12 16:14:34,268 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:34,268 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:34,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-10-12 16:14:34,268 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:34,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:34,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1733168108, now seen corresponding path program 36 times [2020-10-12 16:14:34,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:34,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874961083] [2020-10-12 16:14:34,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:34,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:34,299 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:34,762 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:35,923 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:35,923 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 58 [2020-10-12 16:14:35,923 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1637 [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 41 [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 45 [2020-10-12 16:14:35,924 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:37,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:37,244 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:37,245 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:37,246 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:37,250 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:37,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874961083] [2020-10-12 16:14:37,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:37,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-10-12 16:14:37,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759152700] [2020-10-12 16:14:37,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-10-12 16:14:37,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:37,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-10-12 16:14:37,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-10-12 16:14:37,252 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-10-12 16:14:39,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:39,792 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-10-12 16:14:39,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-10-12 16:14:39,795 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-10-12 16:14:39,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:39,796 INFO L225 Difference]: With dead ends: 59 [2020-10-12 16:14:39,796 INFO L226 Difference]: Without dead ends: 52 [2020-10-12 16:14:39,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 778 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=247, Invalid=6559, Unknown=0, NotChecked=0, Total=6806 [2020-10-12 16:14:39,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-12 16:14:39,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-10-12 16:14:39,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-12 16:14:39,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-10-12 16:14:39,799 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-10-12 16:14:39,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:39,800 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-10-12 16:14:39,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-10-12 16:14:39,800 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-10-12 16:14:39,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-10-12 16:14:39,800 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:39,800 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:39,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-10-12 16:14:39,800 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:39,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:39,801 INFO L82 PathProgramCache]: Analyzing trace with hash 44837494, now seen corresponding path program 37 times [2020-10-12 16:14:39,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:39,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104534106] [2020-10-12 16:14:39,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:39,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:39,822 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:40,426 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 59 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1042 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 42 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:40,856 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 46 [2020-10-12 16:14:40,857 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:42,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:42,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:42,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:42,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:42,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:42,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:42,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:42,229 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:42,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104534106] [2020-10-12 16:14:42,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:42,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-10-12 16:14:42,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964170579] [2020-10-12 16:14:42,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-10-12 16:14:42,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:42,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-10-12 16:14:42,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-10-12 16:14:42,231 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-10-12 16:14:44,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:44,918 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-10-12 16:14:44,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-10-12 16:14:44,919 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-10-12 16:14:44,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:44,920 INFO L225 Difference]: With dead ends: 60 [2020-10-12 16:14:44,920 INFO L226 Difference]: Without dead ends: 53 [2020-10-12 16:14:44,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=253, Invalid=6887, Unknown=0, NotChecked=0, Total=7140 [2020-10-12 16:14:44,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-12 16:14:44,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-10-12 16:14:44,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-12 16:14:44,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-10-12 16:14:44,926 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-10-12 16:14:44,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:44,926 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-10-12 16:14:44,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-10-12 16:14:44,927 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-10-12 16:14:44,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-12 16:14:44,927 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:44,927 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:44,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-10-12 16:14:44,928 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:44,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:44,928 INFO L82 PathProgramCache]: Analyzing trace with hash -671563692, now seen corresponding path program 38 times [2020-10-12 16:14:44,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:44,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342910393] [2020-10-12 16:14:44,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:44,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:44,951 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:45,712 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:45,798 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 857 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 43 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:45,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 47 [2020-10-12 16:14:45,800 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:47,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:47,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:47,228 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:47,229 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:47,229 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:47,229 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:47,229 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:47,230 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:47,230 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:47,230 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:47,230 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:47,230 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:47,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342910393] [2020-10-12 16:14:47,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:47,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-10-12 16:14:47,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161971853] [2020-10-12 16:14:47,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-10-12 16:14:47,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:47,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-10-12 16:14:47,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-10-12 16:14:47,237 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-10-12 16:14:50,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:50,003 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-10-12 16:14:50,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-10-12 16:14:50,004 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-10-12 16:14:50,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:50,005 INFO L225 Difference]: With dead ends: 61 [2020-10-12 16:14:50,005 INFO L226 Difference]: Without dead ends: 54 [2020-10-12 16:14:50,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=259, Invalid=7223, Unknown=0, NotChecked=0, Total=7482 [2020-10-12 16:14:50,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-12 16:14:50,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-10-12 16:14:50,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-12 16:14:50,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-10-12 16:14:50,009 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-10-12 16:14:50,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:50,009 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-10-12 16:14:50,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-10-12 16:14:50,009 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-10-12 16:14:50,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-12 16:14:50,010 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:50,010 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:50,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-10-12 16:14:50,010 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:50,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:50,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1405163978, now seen corresponding path program 39 times [2020-10-12 16:14:50,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:50,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209655625] [2020-10-12 16:14:50,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:50,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:50,041 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:50,962 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:51,924 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:51,924 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 61 [2020-10-12 16:14:51,924 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1899 [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 44 [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 48 [2020-10-12 16:14:51,925 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:53,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:53,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:53,472 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:53,473 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:53,473 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:53,473 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:53,473 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:14:53,473 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:53,474 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:53,474 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:53,474 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:53,474 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:53,479 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:53,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209655625] [2020-10-12 16:14:53,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:53,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-10-12 16:14:53,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287151773] [2020-10-12 16:14:53,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-10-12 16:14:53,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:53,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-10-12 16:14:53,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2020-10-12 16:14:53,481 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-10-12 16:14:56,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:14:56,477 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-10-12 16:14:56,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-10-12 16:14:56,478 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-10-12 16:14:56,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:14:56,479 INFO L225 Difference]: With dead ends: 62 [2020-10-12 16:14:56,479 INFO L226 Difference]: Without dead ends: 55 [2020-10-12 16:14:56,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=265, Invalid=7567, Unknown=0, NotChecked=0, Total=7832 [2020-10-12 16:14:56,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-10-12 16:14:56,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-10-12 16:14:56,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-12 16:14:56,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-10-12 16:14:56,484 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-10-12 16:14:56,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:14:56,484 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-10-12 16:14:56,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-10-12 16:14:56,484 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-10-12 16:14:56,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-12 16:14:56,485 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:14:56,485 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:14:56,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-10-12 16:14:56,485 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:14:56,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:14:56,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1623030932, now seen corresponding path program 40 times [2020-10-12 16:14:56,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:14:56,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995531784] [2020-10-12 16:14:56,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:14:56,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:56,513 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:57,265 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:57,734 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 62 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1232 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 45 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:14:57,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 49 [2020-10-12 16:14:57,736 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:59,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:14:59,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:14:59,323 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:14:59,324 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:14:59,324 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:14:59,324 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:14:59,325 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:14:59,331 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:14:59,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995531784] [2020-10-12 16:14:59,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:14:59,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-10-12 16:14:59,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476253955] [2020-10-12 16:14:59,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-10-12 16:14:59,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:14:59,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-10-12 16:14:59,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2020-10-12 16:14:59,333 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-10-12 16:15:02,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:02,384 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-10-12 16:15:02,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-10-12 16:15:02,384 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-10-12 16:15:02,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:02,385 INFO L225 Difference]: With dead ends: 63 [2020-10-12 16:15:02,385 INFO L226 Difference]: Without dead ends: 56 [2020-10-12 16:15:02,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 944 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=271, Invalid=7919, Unknown=0, NotChecked=0, Total=8190 [2020-10-12 16:15:02,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-10-12 16:15:02,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-10-12 16:15:02,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-12 16:15:02,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-10-12 16:15:02,393 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-10-12 16:15:02,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:02,393 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-10-12 16:15:02,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-10-12 16:15:02,393 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-10-12 16:15:02,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-10-12 16:15:02,394 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:02,394 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:02,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-10-12 16:15:02,394 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:02,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:02,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1007792630, now seen corresponding path program 41 times [2020-10-12 16:15:02,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:02,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216269168] [2020-10-12 16:15:02,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:02,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:02,438 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:03,116 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:04,543 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 63 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2124 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 46 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 50 [2020-10-12 16:15:04,544 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:06,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:06,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:06,202 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:06,202 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:06,203 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:06,204 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:06,204 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:06,209 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:06,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216269168] [2020-10-12 16:15:06,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:06,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-10-12 16:15:06,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853059567] [2020-10-12 16:15:06,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-10-12 16:15:06,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:06,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-10-12 16:15:06,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2020-10-12 16:15:06,211 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-10-12 16:15:09,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:09,479 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-10-12 16:15:09,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-10-12 16:15:09,480 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-10-12 16:15:09,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:09,480 INFO L225 Difference]: With dead ends: 64 [2020-10-12 16:15:09,481 INFO L226 Difference]: Without dead ends: 57 [2020-10-12 16:15:09,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=277, Invalid=8279, Unknown=0, NotChecked=0, Total=8556 [2020-10-12 16:15:09,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-10-12 16:15:09,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-10-12 16:15:09,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-12 16:15:09,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-10-12 16:15:09,486 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-10-12 16:15:09,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:09,487 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-10-12 16:15:09,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-10-12 16:15:09,487 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-10-12 16:15:09,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-10-12 16:15:09,487 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:09,487 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:09,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-10-12 16:15:09,488 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:09,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:09,488 INFO L82 PathProgramCache]: Analyzing trace with hash -884725548, now seen corresponding path program 42 times [2020-10-12 16:15:09,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:09,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667537525] [2020-10-12 16:15:09,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:09,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:09,516 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:10,166 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:10,992 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 64 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1488 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 47 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 51 [2020-10-12 16:15:10,993 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:12,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:12,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:12,687 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:12,688 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:12,688 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:12,688 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:12,688 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:15:12,689 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:12,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:12,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:12,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:12,689 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:12,694 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:12,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667537525] [2020-10-12 16:15:12,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:12,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-10-12 16:15:12,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589255112] [2020-10-12 16:15:12,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-10-12 16:15:12,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:12,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-10-12 16:15:12,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2020-10-12 16:15:12,696 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-10-12 16:15:16,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:16,100 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-10-12 16:15:16,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-10-12 16:15:16,101 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-10-12 16:15:16,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:16,102 INFO L225 Difference]: With dead ends: 65 [2020-10-12 16:15:16,102 INFO L226 Difference]: Without dead ends: 58 [2020-10-12 16:15:16,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1033 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=283, Invalid=8647, Unknown=0, NotChecked=0, Total=8930 [2020-10-12 16:15:16,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-10-12 16:15:16,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-10-12 16:15:16,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-10-12 16:15:16,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-10-12 16:15:16,107 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-10-12 16:15:16,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:16,108 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-10-12 16:15:16,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-10-12 16:15:16,108 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-10-12 16:15:16,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-12 16:15:16,108 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:16,109 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:16,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-10-12 16:15:16,109 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:16,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:16,109 INFO L82 PathProgramCache]: Analyzing trace with hash 576753078, now seen corresponding path program 43 times [2020-10-12 16:15:16,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:16,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982752140] [2020-10-12 16:15:16,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:16,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:16,141 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:16,988 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 65 [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1549 [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:17,679 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 48 [2020-10-12 16:15:17,680 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:17,680 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 52 [2020-10-12 16:15:17,680 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:19,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:19,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:19,498 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:19,499 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:19,499 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:19,500 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:19,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982752140] [2020-10-12 16:15:19,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:19,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-10-12 16:15:19,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289221414] [2020-10-12 16:15:19,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-10-12 16:15:19,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:19,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-10-12 16:15:19,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2020-10-12 16:15:19,508 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-10-12 16:15:23,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:23,025 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-10-12 16:15:23,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-10-12 16:15:23,026 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-10-12 16:15:23,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:23,027 INFO L225 Difference]: With dead ends: 66 [2020-10-12 16:15:23,027 INFO L226 Difference]: Without dead ends: 59 [2020-10-12 16:15:23,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=289, Invalid=9023, Unknown=0, NotChecked=0, Total=9312 [2020-10-12 16:15:23,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-10-12 16:15:23,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-10-12 16:15:23,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-12 16:15:23,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-10-12 16:15:23,033 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-10-12 16:15:23,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:23,033 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-10-12 16:15:23,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-10-12 16:15:23,033 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-10-12 16:15:23,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-10-12 16:15:23,034 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:23,034 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:23,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-10-12 16:15:23,034 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:23,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:23,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1362049772, now seen corresponding path program 44 times [2020-10-12 16:15:23,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:23,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577353240] [2020-10-12 16:15:23,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:23,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:23,062 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:24,082 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:24,485 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:24,485 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 66 [2020-10-12 16:15:24,485 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:24,485 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1434 [2020-10-12 16:15:24,486 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:24,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 49 [2020-10-12 16:15:24,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:24,486 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 53 [2020-10-12 16:15:24,486 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:26,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:26,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:26,391 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:26,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:26,393 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:26,398 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:26,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577353240] [2020-10-12 16:15:26,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:26,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-10-12 16:15:26,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280502674] [2020-10-12 16:15:26,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-10-12 16:15:26,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:26,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-10-12 16:15:26,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2020-10-12 16:15:26,400 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states. [2020-10-12 16:15:30,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:30,028 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2020-10-12 16:15:30,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-10-12 16:15:30,029 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 58 [2020-10-12 16:15:30,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:30,030 INFO L225 Difference]: With dead ends: 67 [2020-10-12 16:15:30,030 INFO L226 Difference]: Without dead ends: 60 [2020-10-12 16:15:30,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=295, Invalid=9407, Unknown=0, NotChecked=0, Total=9702 [2020-10-12 16:15:30,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-12 16:15:30,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-10-12 16:15:30,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-10-12 16:15:30,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-10-12 16:15:30,034 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-10-12 16:15:30,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:30,035 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-10-12 16:15:30,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-10-12 16:15:30,035 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-10-12 16:15:30,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-12 16:15:30,035 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:30,036 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:30,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-10-12 16:15:30,036 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:30,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:30,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1335395978, now seen corresponding path program 45 times [2020-10-12 16:15:30,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:30,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366357939] [2020-10-12 16:15:30,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:30,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:30,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:31,040 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:31,727 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:31,727 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-10-12 16:15:31,727 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1670 [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 50 [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 54 [2020-10-12 16:15:31,728 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:33,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:33,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:33,687 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:33,687 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:33,687 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:33,688 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:33,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:33,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366357939] [2020-10-12 16:15:33,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:33,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-10-12 16:15:33,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443601905] [2020-10-12 16:15:33,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-10-12 16:15:33,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:33,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-10-12 16:15:33,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2020-10-12 16:15:33,697 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 52 states. [2020-10-12 16:15:37,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:37,445 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-10-12 16:15:37,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-10-12 16:15:37,446 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 59 [2020-10-12 16:15:37,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:37,447 INFO L225 Difference]: With dead ends: 68 [2020-10-12 16:15:37,447 INFO L226 Difference]: Without dead ends: 61 [2020-10-12 16:15:37,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1174 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=301, Invalid=9799, Unknown=0, NotChecked=0, Total=10100 [2020-10-12 16:15:37,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-10-12 16:15:37,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-10-12 16:15:37,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-10-12 16:15:37,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-10-12 16:15:37,453 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2020-10-12 16:15:37,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:37,454 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-10-12 16:15:37,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-10-12 16:15:37,454 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-10-12 16:15:37,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-10-12 16:15:37,454 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:37,455 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:37,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-10-12 16:15:37,455 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:37,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:37,455 INFO L82 PathProgramCache]: Analyzing trace with hash -509128364, now seen corresponding path program 46 times [2020-10-12 16:15:37,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:37,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254185726] [2020-10-12 16:15:37,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:37,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:37,484 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:38,281 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:40,102 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:40,102 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 68 [2020-10-12 16:15:40,102 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:40,102 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2630 [2020-10-12 16:15:40,103 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:40,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 51 [2020-10-12 16:15:40,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:40,103 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 55 [2020-10-12 16:15:40,103 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:42,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:42,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:42,168 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:42,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:42,170 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:42,170 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:42,170 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:42,176 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:42,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254185726] [2020-10-12 16:15:42,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:42,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-10-12 16:15:42,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736143796] [2020-10-12 16:15:42,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-10-12 16:15:42,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:42,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-10-12 16:15:42,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2020-10-12 16:15:42,178 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 53 states. [2020-10-12 16:15:46,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:46,079 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2020-10-12 16:15:46,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-10-12 16:15:46,080 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 60 [2020-10-12 16:15:46,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:46,081 INFO L225 Difference]: With dead ends: 69 [2020-10-12 16:15:46,081 INFO L226 Difference]: Without dead ends: 62 [2020-10-12 16:15:46,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1223 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=307, Invalid=10199, Unknown=0, NotChecked=0, Total=10506 [2020-10-12 16:15:46,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-10-12 16:15:46,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-10-12 16:15:46,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-10-12 16:15:46,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2020-10-12 16:15:46,089 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2020-10-12 16:15:46,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:46,090 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2020-10-12 16:15:46,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-10-12 16:15:46,090 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2020-10-12 16:15:46,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-12 16:15:46,090 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:46,091 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:46,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-10-12 16:15:46,091 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:46,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:46,091 INFO L82 PathProgramCache]: Analyzing trace with hash -664636106, now seen corresponding path program 47 times [2020-10-12 16:15:46,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:46,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195897717] [2020-10-12 16:15:46,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:46,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:46,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:47,249 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:47,809 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 69 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1693 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 52 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 56 [2020-10-12 16:15:47,810 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:50,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:50,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:50,036 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:50,036 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:50,036 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:50,037 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:50,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:50,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195897717] [2020-10-12 16:15:50,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:50,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-10-12 16:15:50,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393862333] [2020-10-12 16:15:50,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-10-12 16:15:50,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:50,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-10-12 16:15:50,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2020-10-12 16:15:50,045 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 54 states. [2020-10-12 16:15:54,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:15:54,128 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-10-12 16:15:54,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-10-12 16:15:54,129 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 61 [2020-10-12 16:15:54,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:15:54,130 INFO L225 Difference]: With dead ends: 70 [2020-10-12 16:15:54,130 INFO L226 Difference]: Without dead ends: 63 [2020-10-12 16:15:54,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1273 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=313, Invalid=10607, Unknown=0, NotChecked=0, Total=10920 [2020-10-12 16:15:54,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-10-12 16:15:54,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-10-12 16:15:54,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-10-12 16:15:54,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-10-12 16:15:54,136 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2020-10-12 16:15:54,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:15:54,137 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-10-12 16:15:54,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-10-12 16:15:54,137 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-10-12 16:15:54,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-10-12 16:15:54,137 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:15:54,137 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:15:54,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-10-12 16:15:54,138 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:15:54,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:15:54,138 INFO L82 PathProgramCache]: Analyzing trace with hash -1190408812, now seen corresponding path program 48 times [2020-10-12 16:15:54,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:15:54,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570629804] [2020-10-12 16:15:54,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:15:54,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:54,170 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:55,106 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 70 [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2512 [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 53 [2020-10-12 16:15:56,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:15:56,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 57 [2020-10-12 16:15:56,670 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:58,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:15:58,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:15:58,945 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:15:58,946 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:15:58,946 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:15:58,946 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:15:58,947 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:15:58,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:15:58,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570629804] [2020-10-12 16:15:58,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:15:58,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-10-12 16:15:58,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194716552] [2020-10-12 16:15:58,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-10-12 16:15:58,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:15:58,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-10-12 16:15:58,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2020-10-12 16:15:58,956 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 55 states. [2020-10-12 16:16:03,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:03,116 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2020-10-12 16:16:03,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-10-12 16:16:03,117 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 62 [2020-10-12 16:16:03,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:03,118 INFO L225 Difference]: With dead ends: 71 [2020-10-12 16:16:03,118 INFO L226 Difference]: Without dead ends: 64 [2020-10-12 16:16:03,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=319, Invalid=11023, Unknown=0, NotChecked=0, Total=11342 [2020-10-12 16:16:03,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-10-12 16:16:03,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-10-12 16:16:03,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-10-12 16:16:03,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2020-10-12 16:16:03,124 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2020-10-12 16:16:03,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:03,125 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2020-10-12 16:16:03,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-10-12 16:16:03,125 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2020-10-12 16:16:03,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-10-12 16:16:03,126 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:03,126 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:03,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-10-12 16:16:03,126 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:03,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:03,127 INFO L82 PathProgramCache]: Analyzing trace with hash -309493514, now seen corresponding path program 49 times [2020-10-12 16:16:03,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:03,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292197093] [2020-10-12 16:16:03,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:03,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:03,168 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:04,248 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2243 [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 54 [2020-10-12 16:16:05,395 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:05,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 58 [2020-10-12 16:16:05,396 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:07,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:07,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:07,724 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:07,725 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:07,725 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:07,725 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:07,725 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:16:07,725 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:07,726 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:07,726 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:07,726 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:07,726 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:07,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:07,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292197093] [2020-10-12 16:16:07,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:07,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-10-12 16:16:07,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360387877] [2020-10-12 16:16:07,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-10-12 16:16:07,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:07,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-10-12 16:16:07,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2020-10-12 16:16:07,735 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 56 states. [2020-10-12 16:16:11,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:11,968 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-10-12 16:16:11,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-10-12 16:16:11,968 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 63 [2020-10-12 16:16:11,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:11,970 INFO L225 Difference]: With dead ends: 72 [2020-10-12 16:16:11,970 INFO L226 Difference]: Without dead ends: 65 [2020-10-12 16:16:11,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1376 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=325, Invalid=11447, Unknown=0, NotChecked=0, Total=11772 [2020-10-12 16:16:11,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-10-12 16:16:11,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2020-10-12 16:16:11,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-10-12 16:16:11,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-10-12 16:16:11,976 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2020-10-12 16:16:11,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:11,976 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-10-12 16:16:11,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-10-12 16:16:11,976 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-10-12 16:16:11,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-12 16:16:11,977 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:11,977 INFO L422 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:11,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-10-12 16:16:11,978 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:11,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:11,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1229076948, now seen corresponding path program 50 times [2020-10-12 16:16:11,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:11,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93383403] [2020-10-12 16:16:11,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:11,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:12,014 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:13,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:13,567 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1569 [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 55 [2020-10-12 16:16:13,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:13,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 59 [2020-10-12 16:16:13,569 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:15,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:15,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:15,974 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:15,974 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:15,975 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:15,975 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:15,975 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:16:15,975 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:15,975 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:15,976 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:15,976 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:15,976 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:15,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:15,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93383403] [2020-10-12 16:16:15,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:15,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-10-12 16:16:15,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647339957] [2020-10-12 16:16:15,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-10-12 16:16:15,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:15,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-10-12 16:16:15,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2020-10-12 16:16:15,984 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 57 states. [2020-10-12 16:16:20,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:20,380 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2020-10-12 16:16:20,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-10-12 16:16:20,381 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 64 [2020-10-12 16:16:20,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:20,382 INFO L225 Difference]: With dead ends: 73 [2020-10-12 16:16:20,383 INFO L226 Difference]: Without dead ends: 66 [2020-10-12 16:16:20,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1429 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=331, Invalid=11879, Unknown=0, NotChecked=0, Total=12210 [2020-10-12 16:16:20,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-10-12 16:16:20,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-10-12 16:16:20,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-10-12 16:16:20,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2020-10-12 16:16:20,389 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2020-10-12 16:16:20,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:20,390 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2020-10-12 16:16:20,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-10-12 16:16:20,390 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2020-10-12 16:16:20,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-10-12 16:16:20,391 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:20,391 INFO L422 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:20,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-10-12 16:16:20,391 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:20,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:20,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1680121014, now seen corresponding path program 51 times [2020-10-12 16:16:20,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:20,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047679668] [2020-10-12 16:16:20,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:20,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:20,426 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:21,914 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:22,039 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1628 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 56 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 60 [2020-10-12 16:16:22,040 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:24,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:24,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:24,425 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:24,426 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:24,426 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:24,426 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:24,426 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:16:24,426 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:24,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:24,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:24,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:24,427 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:24,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:24,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047679668] [2020-10-12 16:16:24,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:24,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-10-12 16:16:24,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698259012] [2020-10-12 16:16:24,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-10-12 16:16:24,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:24,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-10-12 16:16:24,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2020-10-12 16:16:24,438 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 58 states. [2020-10-12 16:16:28,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:28,932 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-10-12 16:16:28,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-10-12 16:16:28,933 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 65 [2020-10-12 16:16:28,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:28,935 INFO L225 Difference]: With dead ends: 74 [2020-10-12 16:16:28,935 INFO L226 Difference]: Without dead ends: 67 [2020-10-12 16:16:28,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1483 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=337, Invalid=12319, Unknown=0, NotChecked=0, Total=12656 [2020-10-12 16:16:28,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-10-12 16:16:28,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-10-12 16:16:28,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-12 16:16:28,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-10-12 16:16:28,941 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2020-10-12 16:16:28,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:28,941 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-10-12 16:16:28,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-10-12 16:16:28,942 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-10-12 16:16:28,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-10-12 16:16:28,942 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:28,943 INFO L422 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:28,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-10-12 16:16:28,943 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:28,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:28,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1517382124, now seen corresponding path program 52 times [2020-10-12 16:16:28,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:28,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780137049] [2020-10-12 16:16:28,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:28,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:28,982 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:30,587 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:30,696 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:30,696 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-10-12 16:16:30,696 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1731 [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 57 [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 61 [2020-10-12 16:16:30,697 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:33,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:33,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:33,238 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:33,238 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:33,239 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:33,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:33,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780137049] [2020-10-12 16:16:33,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:33,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-10-12 16:16:33,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307615434] [2020-10-12 16:16:33,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-10-12 16:16:33,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:33,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-10-12 16:16:33,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2020-10-12 16:16:33,249 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 59 states. [2020-10-12 16:16:37,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:37,949 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2020-10-12 16:16:37,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-10-12 16:16:37,949 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 66 [2020-10-12 16:16:37,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:37,951 INFO L225 Difference]: With dead ends: 75 [2020-10-12 16:16:37,951 INFO L226 Difference]: Without dead ends: 68 [2020-10-12 16:16:37,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1538 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=343, Invalid=12767, Unknown=0, NotChecked=0, Total=13110 [2020-10-12 16:16:37,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-10-12 16:16:37,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-10-12 16:16:37,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-10-12 16:16:37,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2020-10-12 16:16:37,957 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2020-10-12 16:16:37,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:37,957 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2020-10-12 16:16:37,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-10-12 16:16:37,958 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2020-10-12 16:16:37,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-10-12 16:16:37,958 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:37,958 INFO L422 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:37,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-10-12 16:16:37,959 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:37,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:37,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1855731594, now seen corresponding path program 53 times [2020-10-12 16:16:37,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:37,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507703550] [2020-10-12 16:16:37,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:37,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:38,008 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:39,635 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:40,167 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:40,167 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2180 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 58 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 62 [2020-10-12 16:16:40,168 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:42,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:42,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:42,851 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:42,851 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:42,851 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:42,851 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:42,851 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:16:42,852 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:42,852 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:42,852 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:42,852 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:42,852 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:42,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:42,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507703550] [2020-10-12 16:16:42,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:42,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-10-12 16:16:42,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999716174] [2020-10-12 16:16:42,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-10-12 16:16:42,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:42,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-10-12 16:16:42,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2020-10-12 16:16:42,861 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 60 states. [2020-10-12 16:16:47,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:47,693 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-10-12 16:16:47,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-10-12 16:16:47,694 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 67 [2020-10-12 16:16:47,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:47,695 INFO L225 Difference]: With dead ends: 76 [2020-10-12 16:16:47,695 INFO L226 Difference]: Without dead ends: 69 [2020-10-12 16:16:47,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=349, Invalid=13223, Unknown=0, NotChecked=0, Total=13572 [2020-10-12 16:16:47,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-12 16:16:47,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-10-12 16:16:47,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-10-12 16:16:47,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-10-12 16:16:47,700 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2020-10-12 16:16:47,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:47,701 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-10-12 16:16:47,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-10-12 16:16:47,701 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-10-12 16:16:47,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-10-12 16:16:47,701 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:47,702 INFO L422 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:47,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-10-12 16:16:47,702 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:47,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:47,702 INFO L82 PathProgramCache]: Analyzing trace with hash 540336724, now seen corresponding path program 54 times [2020-10-12 16:16:47,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:47,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492778542] [2020-10-12 16:16:47,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:47,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:47,738 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:48,895 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3643 [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 59 [2020-10-12 16:16:51,365 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:16:51,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 63 [2020-10-12 16:16:51,366 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:54,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:16:54,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:54,164 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:16:54,164 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:16:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:16:54,166 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:16:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:16:54,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492778542] [2020-10-12 16:16:54,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:16:54,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-10-12 16:16:54,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021176887] [2020-10-12 16:16:54,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-10-12 16:16:54,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:16:54,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-10-12 16:16:54,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2020-10-12 16:16:54,176 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 61 states. [2020-10-12 16:16:59,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:16:59,183 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2020-10-12 16:16:59,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-10-12 16:16:59,183 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 68 [2020-10-12 16:16:59,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:16:59,184 INFO L225 Difference]: With dead ends: 77 [2020-10-12 16:16:59,184 INFO L226 Difference]: Without dead ends: 70 [2020-10-12 16:16:59,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1651 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=355, Invalid=13687, Unknown=0, NotChecked=0, Total=14042 [2020-10-12 16:16:59,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-10-12 16:16:59,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-10-12 16:16:59,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-10-12 16:16:59,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2020-10-12 16:16:59,189 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2020-10-12 16:16:59,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:16:59,189 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2020-10-12 16:16:59,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-10-12 16:16:59,189 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2020-10-12 16:16:59,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-12 16:16:59,190 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:16:59,190 INFO L422 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:16:59,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-10-12 16:16:59,190 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:16:59,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:16:59,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1804010550, now seen corresponding path program 55 times [2020-10-12 16:16:59,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:16:59,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771157991] [2020-10-12 16:16:59,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:16:59,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:16:59,231 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:17:00,526 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:17:02,655 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:17:02,655 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-12 16:17:02,656 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:17:02,656 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3441 [2020-10-12 16:17:02,656 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:17:02,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 60 [2020-10-12 16:17:02,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:17:02,657 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 64 [2020-10-12 16:17:02,657 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:17:05,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:17:05,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:17:05,526 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:17:05,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:17:05,528 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:17:05,528 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:17:05,528 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:17:05,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:17:05,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771157991] [2020-10-12 16:17:05,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:17:05,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-10-12 16:17:05,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186621431] [2020-10-12 16:17:05,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-10-12 16:17:05,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:17:05,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-10-12 16:17:05,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3661, Unknown=0, NotChecked=0, Total=3782 [2020-10-12 16:17:05,538 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 62 states.