/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:06:50,610 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:06:50,612 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:06:50,635 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:06:50,636 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:06:50,637 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:06:50,638 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:06:50,640 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:06:50,641 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:06:50,642 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:06:50,643 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:06:50,644 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:06:50,645 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:06:50,645 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:06:50,647 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:06:50,648 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:06:50,648 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:06:50,649 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:06:50,651 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:06:50,653 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:06:50,654 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:06:50,655 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:06:50,656 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:06:50,657 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:06:50,659 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:06:50,660 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:06:50,660 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:06:50,661 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:06:50,661 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:06:50,662 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:06:50,662 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:06:50,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:06:50,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:06:50,664 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:06:50,665 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:06:50,666 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:06:50,666 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:06:50,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:06:50,667 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:06:50,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:06:50,668 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:06:50,669 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 [2020-08-21 23:06:50,691 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:06:50,691 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:06:50,692 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:06:50,693 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:06:50,693 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:06:50,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:06:50,693 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:06:50,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:06:50,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:06:50,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:06:50,694 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:06:50,694 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:06:50,695 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:06:50,695 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:06:50,695 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:06:50,695 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:06:50,695 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:06:50,696 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:06:50,696 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:06:50,696 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:06:50,696 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:06:50,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:06:50,696 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:06:50,697 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:06:50,697 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:06:50,697 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:06:50,697 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:06:50,697 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:06:50,698 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:06:50,698 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; [2020-08-21 23:06:51,011 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:06:51,022 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:06:51,026 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:06:51,027 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:06:51,027 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:06:51,028 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 23:06:51,087 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/48c271930/0bdc3f6ea9914186969e5ad143bd7a6a/FLAG2db2360f3 [2020-08-21 23:06:51,505 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:06:51,505 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 23:06:51,510 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/48c271930/0bdc3f6ea9914186969e5ad143bd7a6a/FLAG2db2360f3 [2020-08-21 23:06:51,928 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/48c271930/0bdc3f6ea9914186969e5ad143bd7a6a [2020-08-21 23:06:51,935 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:06:51,937 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:06:51,938 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:06:51,938 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:06:51,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:06:51,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:06:51" (1/1) ... [2020-08-21 23:06:51,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74a7ca91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:51, skipping insertion in model container [2020-08-21 23:06:51,945 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:06:51" (1/1) ... [2020-08-21 23:06:51,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:06:51,969 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:06:52,145 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:06:52,150 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:06:52,164 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:06:52,178 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:06:52,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52 WrapperNode [2020-08-21 23:06:52,178 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:06:52,179 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:06:52,179 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:06:52,179 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:06:52,190 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,190 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,194 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,285 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (1/1) ... [2020-08-21 23:06:52,287 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:06:52,287 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:06:52,287 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:06:52,288 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:06:52,288 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (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 [2020-08-21 23:06:52,344 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:06:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:06:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 23:06:52,345 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:06:52,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:06:52,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 23:06:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:06:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:06:52,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:06:52,501 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:06:52,501 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 23:06:52,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:06:52 BoogieIcfgContainer [2020-08-21 23:06:52,504 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:06:52,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:06:52,506 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:06:52,509 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:06:52,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:06:51" (1/3) ... [2020-08-21 23:06:52,510 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68608d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:06:52, skipping insertion in model container [2020-08-21 23:06:52,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:52" (2/3) ... [2020-08-21 23:06:52,510 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68608d40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:06:52, skipping insertion in model container [2020-08-21 23:06:52,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:06:52" (3/3) ... [2020-08-21 23:06:52,512 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 23:06:52,521 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:06:52,527 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:06:52,538 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:06:52,560 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:06:52,560 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:06:52,560 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:06:52,560 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:06:52,561 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:06:52,561 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:06:52,561 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:06:52,561 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:06:52,576 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 23:06:52,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 23:06:52,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:52,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:52,582 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:52,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:52,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 23:06:52,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:52,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559123893] [2020-08-21 23:06:52,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:52,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:52,936 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-21 23:06:52,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:52,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:52,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:52,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559123893] [2020-08-21 23:06:52,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:06:52,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 23:06:52,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907373557] [2020-08-21 23:06:52,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 23:06:52,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:52,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 23:06:52,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 23:06:52,981 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 23:06:53,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,028 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 23:06:53,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 23:06:53,030 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 23:06:53,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,036 INFO L225 Difference]: With dead ends: 29 [2020-08-21 23:06:53,036 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 23:06:53,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 23:06:53,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 23:06:53,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 23:06:53,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 23:06:53,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 23:06:53,069 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 23:06:53,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,069 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 23:06:53,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 23:06:53,070 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 23:06:53,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 23:06:53,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,070 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:06:53,071 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 23:06:53,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249987853] [2020-08-21 23:06:53,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:53,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:53,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249987853] [2020-08-21 23:06:53,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:53,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 23:06:53,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910280206] [2020-08-21 23:06:53,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:06:53,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:53,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:06:53,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:06:53,162 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 23:06:53,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,182 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 23:06:53,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:06:53,182 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 23:06:53,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,183 INFO L225 Difference]: With dead ends: 18 [2020-08-21 23:06:53,184 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 23:06:53,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:06:53,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 23:06:53,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 23:06:53,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 23:06:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 23:06:53,190 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 23:06:53,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,190 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 23:06:53,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:06:53,191 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 23:06:53,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 23:06:53,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,192 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:06:53,192 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 23:06:53,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719037253] [2020-08-21 23:06:53,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:53,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,298 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:53,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719037253] [2020-08-21 23:06:53,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:53,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 23:06:53,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316172459] [2020-08-21 23:06:53,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:06:53,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:53,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:06:53,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:06:53,301 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 23:06:53,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,321 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 23:06:53,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:06:53,322 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 23:06:53,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,323 INFO L225 Difference]: With dead ends: 19 [2020-08-21 23:06:53,323 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 23:06:53,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:06:53,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 23:06:53,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 23:06:53,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 23:06:53,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 23:06:53,329 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 23:06:53,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,330 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 23:06:53,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:06:53,330 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 23:06:53,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:06:53,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,331 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:06:53,332 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 23:06:53,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798228491] [2020-08-21 23:06:53,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:53,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:53,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798228491] [2020-08-21 23:06:53,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:53,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:06:53,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422226228] [2020-08-21 23:06:53,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:06:53,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:53,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:06:53,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:06:53,433 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 23:06:53,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,458 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 23:06:53,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:06:53,458 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 23:06:53,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,459 INFO L225 Difference]: With dead ends: 20 [2020-08-21 23:06:53,459 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 23:06:53,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:06:53,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 23:06:53,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 23:06:53,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 23:06:53,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 23:06:53,465 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 23:06:53,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,465 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 23:06:53,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:06:53,466 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 23:06:53,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 23:06:53,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,467 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:06:53,467 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 23:06:53,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443024749] [2020-08-21 23:06:53,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:53,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,568 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:53,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443024749] [2020-08-21 23:06:53,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:53,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:06:53,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589511672] [2020-08-21 23:06:53,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:06:53,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:53,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:06:53,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:06:53,571 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 23:06:53,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,606 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 23:06:53,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:06:53,607 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 23:06:53,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,608 INFO L225 Difference]: With dead ends: 21 [2020-08-21 23:06:53,608 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 23:06:53,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:06:53,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 23:06:53,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 23:06:53,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 23:06:53,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 23:06:53,614 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 23:06:53,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,615 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 23:06:53,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:06:53,615 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 23:06:53,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 23:06:53,616 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,616 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:06:53,617 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 23:06:53,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56797879] [2020-08-21 23:06:53,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:53,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:53,792 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:53,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56797879] [2020-08-21 23:06:53,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:53,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:06:53,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058212556] [2020-08-21 23:06:53,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:06:53,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:53,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:06:53,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:06:53,799 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 23:06:53,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:53,857 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 23:06:53,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:06:53,858 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 23:06:53,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:53,858 INFO L225 Difference]: With dead ends: 22 [2020-08-21 23:06:53,859 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 23:06:53,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:06:53,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 23:06:53,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 23:06:53,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 23:06:53,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 23:06:53,869 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 23:06:53,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:53,869 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 23:06:53,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:06:53,869 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 23:06:53,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:06:53,876 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:53,876 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:53,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:06:53,876 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:53,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:53,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 23:06:53,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:53,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805473926] [2020-08-21 23:06:53,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:53,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:54,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,060 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:54,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805473926] [2020-08-21 23:06:54,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:54,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:06:54,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600924130] [2020-08-21 23:06:54,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:06:54,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:54,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:06:54,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:06:54,063 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 23:06:54,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:54,110 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 23:06:54,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:06:54,110 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 23:06:54,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:54,111 INFO L225 Difference]: With dead ends: 23 [2020-08-21 23:06:54,111 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 23:06:54,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:06:54,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 23:06:54,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 23:06:54,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 23:06:54,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 23:06:54,117 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 23:06:54,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:54,117 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 23:06:54,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:06:54,117 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 23:06:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 23:06:54,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:54,118 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:54,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:06:54,119 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:54,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:54,119 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 23:06:54,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:54,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587685344] [2020-08-21 23:06:54,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:54,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:54,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,248 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:54,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587685344] [2020-08-21 23:06:54,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:54,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:06:54,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431289551] [2020-08-21 23:06:54,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:06:54,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:54,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:06:54,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:06:54,251 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 23:06:54,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:54,300 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 23:06:54,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:06:54,301 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 23:06:54,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:54,302 INFO L225 Difference]: With dead ends: 24 [2020-08-21 23:06:54,302 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 23:06:54,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:06:54,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 23:06:54,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 23:06:54,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 23:06:54,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 23:06:54,308 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 23:06:54,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:54,308 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 23:06:54,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:06:54,308 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 23:06:54,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 23:06:54,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:54,309 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:54,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:06:54,310 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:54,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:54,310 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 23:06:54,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:54,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118516187] [2020-08-21 23:06:54,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:54,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:54,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,449 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:54,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118516187] [2020-08-21 23:06:54,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:54,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:06:54,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714778646] [2020-08-21 23:06:54,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:06:54,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:54,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:06:54,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:06:54,451 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 23:06:54,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:54,523 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 23:06:54,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:06:54,523 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 23:06:54,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:54,524 INFO L225 Difference]: With dead ends: 25 [2020-08-21 23:06:54,524 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 23:06:54,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:06:54,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 23:06:54,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 23:06:54,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 23:06:54,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 23:06:54,530 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 23:06:54,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:54,530 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 23:06:54,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:06:54,531 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 23:06:54,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 23:06:54,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:54,532 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:54,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:06:54,532 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:54,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:54,533 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 23:06:54,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:54,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619386969] [2020-08-21 23:06:54,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:54,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:54,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:54,710 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:54,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619386969] [2020-08-21 23:06:54,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:54,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 23:06:54,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748231900] [2020-08-21 23:06:54,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 23:06:54,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:54,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 23:06:54,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:06:54,713 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 23:06:54,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:54,790 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 23:06:54,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 23:06:54,790 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 23:06:54,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:54,791 INFO L225 Difference]: With dead ends: 26 [2020-08-21 23:06:54,791 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 23:06:54,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:06:54,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 23:06:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 23:06:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:06:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 23:06:54,797 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 23:06:54,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:54,798 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 23:06:54,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 23:06:54,798 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 23:06:54,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 23:06:54,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:54,799 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:54,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 23:06:54,805 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:54,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:54,806 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 23:06:54,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:54,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397812645] [2020-08-21 23:06:54,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:54,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:55,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,043 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:55,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397812645] [2020-08-21 23:06:55,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:55,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 23:06:55,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83948992] [2020-08-21 23:06:55,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 23:06:55,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:55,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 23:06:55,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:06:55,047 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 23:06:55,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:55,153 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 23:06:55,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 23:06:55,155 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 23:06:55,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:55,155 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:06:55,156 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 23:06:55,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:06:55,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 23:06:55,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 23:06:55,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 23:06:55,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 23:06:55,164 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 23:06:55,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:55,164 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 23:06:55,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 23:06:55,165 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 23:06:55,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 23:06:55,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:55,167 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:55,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 23:06:55,167 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:55,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:55,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 23:06:55,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:55,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059333595] [2020-08-21 23:06:55,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:55,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:55,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,364 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:55,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059333595] [2020-08-21 23:06:55,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:55,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 23:06:55,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802140748] [2020-08-21 23:06:55,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 23:06:55,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:55,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 23:06:55,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:06:55,368 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 23:06:55,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:55,486 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 23:06:55,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 23:06:55,488 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 23:06:55,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:55,489 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:06:55,489 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 23:06:55,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:06:55,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 23:06:55,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 23:06:55,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 23:06:55,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 23:06:55,496 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 23:06:55,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:55,496 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 23:06:55,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 23:06:55,497 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 23:06:55,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 23:06:55,497 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:55,498 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:55,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 23:06:55,501 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:55,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:55,501 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 23:06:55,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:55,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943948570] [2020-08-21 23:06:55,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:55,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:55,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:55,721 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:55,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943948570] [2020-08-21 23:06:55,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:55,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 23:06:55,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665559995] [2020-08-21 23:06:55,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 23:06:55,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:55,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 23:06:55,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:06:55,723 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 23:06:55,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:55,842 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 23:06:55,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 23:06:55,843 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 23:06:55,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:55,843 INFO L225 Difference]: With dead ends: 29 [2020-08-21 23:06:55,843 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 23:06:55,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:06:55,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 23:06:55,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 23:06:55,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 23:06:55,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 23:06:55,848 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 23:06:55,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:55,849 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 23:06:55,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 23:06:55,849 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 23:06:55,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 23:06:55,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:55,850 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:55,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 23:06:55,850 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:55,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:55,851 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 23:06:55,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:55,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211726408] [2020-08-21 23:06:55,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:55,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:56,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,069 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:56,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211726408] [2020-08-21 23:06:56,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:56,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 23:06:56,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358160227] [2020-08-21 23:06:56,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 23:06:56,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:56,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 23:06:56,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 23:06:56,071 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 23:06:56,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:56,224 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 23:06:56,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 23:06:56,225 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 23:06:56,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:56,226 INFO L225 Difference]: With dead ends: 30 [2020-08-21 23:06:56,226 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 23:06:56,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 23:06:56,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 23:06:56,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 23:06:56,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 23:06:56,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 23:06:56,231 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 23:06:56,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:56,231 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 23:06:56,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 23:06:56,231 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 23:06:56,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 23:06:56,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:56,232 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:56,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 23:06:56,233 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:56,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:56,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 23:06:56,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:56,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058432979] [2020-08-21 23:06:56,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:56,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:56,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,479 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:56,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058432979] [2020-08-21 23:06:56,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:56,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 23:06:56,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189100420] [2020-08-21 23:06:56,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 23:06:56,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:56,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 23:06:56,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:06:56,482 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 23:06:56,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:56,654 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 23:06:56,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 23:06:56,654 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 23:06:56,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:56,655 INFO L225 Difference]: With dead ends: 31 [2020-08-21 23:06:56,655 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 23:06:56,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:06:56,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 23:06:56,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 23:06:56,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 23:06:56,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 23:06:56,660 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 23:06:56,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:56,661 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 23:06:56,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 23:06:56,661 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 23:06:56,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 23:06:56,662 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:56,662 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:56,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 23:06:56,662 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:56,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:56,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 23:06:56,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:56,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962397882] [2020-08-21 23:06:56,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:56,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:56,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:56,934 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:56,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962397882] [2020-08-21 23:06:56,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:56,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 23:06:56,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133613224] [2020-08-21 23:06:56,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 23:06:56,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:56,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 23:06:56,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 23:06:56,937 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 23:06:57,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:57,110 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 23:06:57,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 23:06:57,112 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 23:06:57,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:57,113 INFO L225 Difference]: With dead ends: 32 [2020-08-21 23:06:57,113 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 23:06:57,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 23:06:57,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 23:06:57,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 23:06:57,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 23:06:57,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 23:06:57,119 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 23:06:57,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:57,120 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 23:06:57,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 23:06:57,120 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 23:06:57,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 23:06:57,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:57,123 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:57,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 23:06:57,123 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:57,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:57,124 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 23:06:57,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:57,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370711912] [2020-08-21 23:06:57,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:57,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:57,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:57,438 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:57,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370711912] [2020-08-21 23:06:57,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:57,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 23:06:57,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546440393] [2020-08-21 23:06:57,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 23:06:57,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:57,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 23:06:57,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:06:57,440 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 23:06:57,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:57,646 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 23:06:57,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 23:06:57,646 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 23:06:57,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:57,647 INFO L225 Difference]: With dead ends: 33 [2020-08-21 23:06:57,647 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 23:06:57,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:06:57,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 23:06:57,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 23:06:57,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 23:06:57,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 23:06:57,659 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 23:06:57,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:57,660 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 23:06:57,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 23:06:57,660 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 23:06:57,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 23:06:57,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:57,662 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:57,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 23:06:57,663 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:57,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:57,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 23:06:57,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:57,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155919763] [2020-08-21 23:06:57,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:57,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:57,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:57,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:58,001 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:58,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155919763] [2020-08-21 23:06:58,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:58,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 23:06:58,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316194859] [2020-08-21 23:06:58,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 23:06:58,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:58,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 23:06:58,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 23:06:58,003 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 23:06:58,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:58,229 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 23:06:58,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 23:06:58,230 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 23:06:58,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:58,231 INFO L225 Difference]: With dead ends: 34 [2020-08-21 23:06:58,231 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 23:06:58,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 23:06:58,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 23:06:58,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 23:06:58,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 23:06:58,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 23:06:58,237 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 23:06:58,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:58,237 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 23:06:58,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 23:06:58,237 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 23:06:58,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 23:06:58,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:58,238 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:58,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 23:06:58,238 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:58,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:58,239 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 23:06:58,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:58,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113229833] [2020-08-21 23:06:58,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:58,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:58,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:58,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:58,575 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:58,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113229833] [2020-08-21 23:06:58,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:58,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 23:06:58,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225710110] [2020-08-21 23:06:58,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 23:06:58,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:58,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 23:06:58,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 23:06:58,577 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 23:06:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:58,818 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 23:06:58,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 23:06:58,819 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 23:06:58,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:58,820 INFO L225 Difference]: With dead ends: 35 [2020-08-21 23:06:58,820 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 23:06:58,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 23:06:58,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 23:06:58,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 23:06:58,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 23:06:58,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 23:06:58,829 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 23:06:58,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:58,829 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 23:06:58,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 23:06:58,830 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 23:06:58,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 23:06:58,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:58,830 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:58,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 23:06:58,831 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:58,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:58,831 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 23:06:58,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:58,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852612597] [2020-08-21 23:06:58,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:58,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:59,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:59,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:59,200 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:59,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852612597] [2020-08-21 23:06:59,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:59,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 23:06:59,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550742584] [2020-08-21 23:06:59,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 23:06:59,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:59,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 23:06:59,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 23:06:59,202 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 23:06:59,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:59,449 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 23:06:59,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 23:06:59,454 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 23:06:59,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:59,455 INFO L225 Difference]: With dead ends: 36 [2020-08-21 23:06:59,455 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 23:06:59,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 23:06:59,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 23:06:59,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 23:06:59,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 23:06:59,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 23:06:59,461 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 23:06:59,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:59,461 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 23:06:59,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 23:06:59,462 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 23:06:59,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 23:06:59,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:59,463 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:59,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 23:06:59,463 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:59,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:59,464 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 23:06:59,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:59,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244578247] [2020-08-21 23:06:59,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:59,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:59,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:59,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:59,859 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:59,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244578247] [2020-08-21 23:06:59,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:59,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 23:06:59,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798942730] [2020-08-21 23:06:59,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 23:06:59,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:59,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 23:06:59,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 23:06:59,863 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 23:07:00,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:00,149 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 23:07:00,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 23:07:00,149 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 23:07:00,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:00,150 INFO L225 Difference]: With dead ends: 37 [2020-08-21 23:07:00,150 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 23:07:00,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 23:07:00,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 23:07:00,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 23:07:00,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 23:07:00,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 23:07:00,156 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 23:07:00,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:00,156 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 23:07:00,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 23:07:00,156 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 23:07:00,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 23:07:00,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:00,158 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:00,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 23:07:00,158 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:00,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:00,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 23:07:00,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:00,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331132188] [2020-08-21 23:07:00,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:00,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:00,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:00,641 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:00,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331132188] [2020-08-21 23:07:00,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:00,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 23:07:00,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165207325] [2020-08-21 23:07:00,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 23:07:00,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:00,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 23:07:00,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 23:07:00,643 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 23:07:00,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:00,956 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 23:07:00,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 23:07:00,958 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 23:07:00,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:00,958 INFO L225 Difference]: With dead ends: 38 [2020-08-21 23:07:00,958 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 23:07:00,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 23:07:00,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 23:07:00,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 23:07:00,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 23:07:00,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 23:07:00,963 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 23:07:00,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:00,964 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 23:07:00,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 23:07:00,964 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 23:07:00,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 23:07:00,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:00,965 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:00,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 23:07:00,965 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:00,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:00,965 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 23:07:00,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:00,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847092348] [2020-08-21 23:07:00,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:00,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:01,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:01,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:01,432 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:01,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847092348] [2020-08-21 23:07:01,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:01,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 23:07:01,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561907773] [2020-08-21 23:07:01,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 23:07:01,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:01,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 23:07:01,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 23:07:01,434 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 23:07:01,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:01,769 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 23:07:01,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 23:07:01,776 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 23:07:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:01,776 INFO L225 Difference]: With dead ends: 39 [2020-08-21 23:07:01,776 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 23:07:01,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 23:07:01,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 23:07:01,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 23:07:01,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 23:07:01,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 23:07:01,781 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 23:07:01,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:01,781 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 23:07:01,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 23:07:01,782 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 23:07:01,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 23:07:01,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:01,783 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:01,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 23:07:01,783 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:01,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:01,783 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 23:07:01,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:01,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982257868] [2020-08-21 23:07:01,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:01,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:02,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:02,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:02,265 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:02,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982257868] [2020-08-21 23:07:02,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:02,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 23:07:02,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144488068] [2020-08-21 23:07:02,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 23:07:02,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:02,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 23:07:02,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 23:07:02,267 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 23:07:02,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:02,650 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 23:07:02,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 23:07:02,651 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 23:07:02,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:02,651 INFO L225 Difference]: With dead ends: 40 [2020-08-21 23:07:02,652 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 23:07:02,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 23:07:02,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 23:07:02,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 23:07:02,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 23:07:02,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 23:07:02,657 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 23:07:02,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:02,657 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 23:07:02,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 23:07:02,657 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 23:07:02,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 23:07:02,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:02,658 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:02,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 23:07:02,658 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:02,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:02,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 23:07:02,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:02,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280274990] [2020-08-21 23:07:02,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:02,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:03,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:03,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:03,214 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:03,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280274990] [2020-08-21 23:07:03,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:03,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 23:07:03,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422471179] [2020-08-21 23:07:03,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 23:07:03,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:03,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 23:07:03,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 23:07:03,216 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 23:07:03,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:03,548 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 23:07:03,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 23:07:03,548 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 23:07:03,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:03,549 INFO L225 Difference]: With dead ends: 41 [2020-08-21 23:07:03,549 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 23:07:03,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 23:07:03,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 23:07:03,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 23:07:03,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 23:07:03,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 23:07:03,554 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 23:07:03,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:03,555 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 23:07:03,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 23:07:03,555 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 23:07:03,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 23:07:03,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:03,555 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:03,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 23:07:03,556 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:03,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:03,556 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 23:07:03,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:03,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071182536] [2020-08-21 23:07:03,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:03,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:04,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:04,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:04,129 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:04,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071182536] [2020-08-21 23:07:04,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:04,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 23:07:04,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161967725] [2020-08-21 23:07:04,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 23:07:04,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:04,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 23:07:04,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 23:07:04,131 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 23:07:04,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:04,572 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 23:07:04,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 23:07:04,573 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 23:07:04,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:04,574 INFO L225 Difference]: With dead ends: 42 [2020-08-21 23:07:04,574 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 23:07:04,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 23:07:04,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 23:07:04,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 23:07:04,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 23:07:04,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 23:07:04,579 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 23:07:04,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:04,579 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 23:07:04,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 23:07:04,579 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 23:07:04,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 23:07:04,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:04,580 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:04,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 23:07:04,580 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:04,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:04,581 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 23:07:04,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:04,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72432310] [2020-08-21 23:07:04,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:04,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:05,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:05,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:05,173 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:05,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72432310] [2020-08-21 23:07:05,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:05,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 23:07:05,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983479142] [2020-08-21 23:07:05,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 23:07:05,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:05,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 23:07:05,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 23:07:05,175 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 23:07:05,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:05,609 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 23:07:05,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 23:07:05,610 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 23:07:05,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:05,610 INFO L225 Difference]: With dead ends: 43 [2020-08-21 23:07:05,610 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 23:07:05,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 23:07:05,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 23:07:05,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 23:07:05,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 23:07:05,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 23:07:05,622 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 23:07:05,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:05,622 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 23:07:05,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 23:07:05,622 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 23:07:05,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 23:07:05,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:05,628 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:05,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 23:07:05,628 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:05,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:05,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 23:07:05,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:05,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748524361] [2020-08-21 23:07:05,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:05,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:06,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:06,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:06,266 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:06,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748524361] [2020-08-21 23:07:06,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:06,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 23:07:06,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018301513] [2020-08-21 23:07:06,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 23:07:06,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:06,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 23:07:06,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 23:07:06,268 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 23:07:06,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:06,771 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 23:07:06,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 23:07:06,771 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 23:07:06,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:06,772 INFO L225 Difference]: With dead ends: 44 [2020-08-21 23:07:06,772 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 23:07:06,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 23:07:06,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 23:07:06,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 23:07:06,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:07:06,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 23:07:06,777 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 23:07:06,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:06,777 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 23:07:06,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 23:07:06,778 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 23:07:06,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 23:07:06,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:06,782 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:06,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 23:07:06,782 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:06,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:06,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 23:07:06,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:06,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866569112] [2020-08-21 23:07:06,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:06,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:07,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:07,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:07,458 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:07,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866569112] [2020-08-21 23:07:07,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:07,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 23:07:07,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166656793] [2020-08-21 23:07:07,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 23:07:07,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:07,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 23:07:07,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 23:07:07,460 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 23:07:07,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:07,979 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 23:07:07,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 23:07:07,980 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 23:07:07,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:07,981 INFO L225 Difference]: With dead ends: 45 [2020-08-21 23:07:07,981 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 23:07:07,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 23:07:07,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 23:07:07,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 23:07:07,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 23:07:07,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 23:07:07,986 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 23:07:07,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:07,986 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 23:07:07,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 23:07:07,986 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 23:07:07,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 23:07:07,987 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:07,987 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:07,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 23:07:07,988 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:07,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:07,988 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 23:07:07,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:07,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331267836] [2020-08-21 23:07:07,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:08,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:08,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:08,721 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:08,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331267836] [2020-08-21 23:07:08,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:08,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 23:07:08,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637023870] [2020-08-21 23:07:08,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 23:07:08,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:08,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 23:07:08,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 23:07:08,723 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 23:07:09,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:09,266 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 23:07:09,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 23:07:09,266 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 23:07:09,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:09,267 INFO L225 Difference]: With dead ends: 46 [2020-08-21 23:07:09,267 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 23:07:09,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 23:07:09,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 23:07:09,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 23:07:09,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 23:07:09,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 23:07:09,273 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 23:07:09,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:09,274 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 23:07:09,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 23:07:09,274 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 23:07:09,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 23:07:09,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:09,274 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:09,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 23:07:09,275 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:09,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:09,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 23:07:09,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:09,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849683918] [2020-08-21 23:07:09,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:09,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:10,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:10,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:10,077 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:10,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849683918] [2020-08-21 23:07:10,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:10,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 23:07:10,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835290713] [2020-08-21 23:07:10,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 23:07:10,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:10,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 23:07:10,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 23:07:10,078 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 23:07:10,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:10,662 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 23:07:10,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 23:07:10,663 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 23:07:10,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:10,664 INFO L225 Difference]: With dead ends: 47 [2020-08-21 23:07:10,664 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 23:07:10,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 23:07:10,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 23:07:10,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 23:07:10,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 23:07:10,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 23:07:10,668 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 23:07:10,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:10,668 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 23:07:10,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 23:07:10,669 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 23:07:10,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 23:07:10,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:10,669 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:10,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 23:07:10,669 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:10,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:10,670 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 23:07:10,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:10,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987104509] [2020-08-21 23:07:10,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:10,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:11,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:11,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:11,514 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:11,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987104509] [2020-08-21 23:07:11,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:11,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 23:07:11,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309315846] [2020-08-21 23:07:11,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 23:07:11,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:11,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 23:07:11,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 23:07:11,516 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 23:07:12,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:12,156 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 23:07:12,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 23:07:12,157 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 23:07:12,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:12,158 INFO L225 Difference]: With dead ends: 48 [2020-08-21 23:07:12,158 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 23:07:12,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 23:07:12,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 23:07:12,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 23:07:12,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 23:07:12,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 23:07:12,163 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 23:07:12,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:12,163 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 23:07:12,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 23:07:12,163 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 23:07:12,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 23:07:12,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:12,164 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:12,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 23:07:12,164 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:12,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:12,165 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 23:07:12,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:12,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189392539] [2020-08-21 23:07:12,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:12,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:12,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:12,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:12,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189392539] [2020-08-21 23:07:12,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:12,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 23:07:12,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738806837] [2020-08-21 23:07:12,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 23:07:12,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:12,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 23:07:12,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 23:07:12,990 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 23:07:13,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:13,657 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 23:07:13,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 23:07:13,658 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 23:07:13,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:13,659 INFO L225 Difference]: With dead ends: 49 [2020-08-21 23:07:13,659 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 23:07:13,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 23:07:13,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 23:07:13,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 23:07:13,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 23:07:13,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 23:07:13,664 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 23:07:13,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:13,665 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 23:07:13,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 23:07:13,665 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 23:07:13,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 23:07:13,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:13,665 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:13,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 23:07:13,666 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:13,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:13,666 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 23:07:13,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:13,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315280177] [2020-08-21 23:07:13,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:13,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:14,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:14,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:14,553 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:14,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315280177] [2020-08-21 23:07:14,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:14,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 23:07:14,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759184803] [2020-08-21 23:07:14,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 23:07:14,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:14,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 23:07:14,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 23:07:14,555 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 23:07:15,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:15,264 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 23:07:15,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 23:07:15,264 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 23:07:15,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:15,265 INFO L225 Difference]: With dead ends: 50 [2020-08-21 23:07:15,265 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 23:07:15,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 23:07:15,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 23:07:15,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 23:07:15,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 23:07:15,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 23:07:15,269 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 23:07:15,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:15,269 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 23:07:15,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 23:07:15,269 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 23:07:15,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 23:07:15,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:15,270 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:15,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 23:07:15,270 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:15,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:15,271 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 23:07:15,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:15,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539522187] [2020-08-21 23:07:15,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:15,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:16,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:16,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:16,230 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:16,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539522187] [2020-08-21 23:07:16,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:16,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 23:07:16,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011789769] [2020-08-21 23:07:16,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 23:07:16,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:16,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 23:07:16,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 23:07:16,233 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 23:07:16,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:16,996 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 23:07:16,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 23:07:16,997 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 23:07:16,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:16,998 INFO L225 Difference]: With dead ends: 51 [2020-08-21 23:07:16,998 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 23:07:16,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 23:07:16,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 23:07:17,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 23:07:17,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 23:07:17,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 23:07:17,002 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 23:07:17,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:17,003 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 23:07:17,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 23:07:17,003 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 23:07:17,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 23:07:17,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:17,004 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:17,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 23:07:17,004 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:17,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:17,004 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 23:07:17,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:17,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656235487] [2020-08-21 23:07:17,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:17,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:18,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:18,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:18,030 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:18,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656235487] [2020-08-21 23:07:18,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:18,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 23:07:18,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718080283] [2020-08-21 23:07:18,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 23:07:18,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:18,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 23:07:18,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 23:07:18,032 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 23:07:18,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:18,809 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 23:07:18,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 23:07:18,810 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 23:07:18,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:18,811 INFO L225 Difference]: With dead ends: 52 [2020-08-21 23:07:18,811 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 23:07:18,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 23:07:18,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 23:07:18,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 23:07:18,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 23:07:18,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 23:07:18,816 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 23:07:18,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:18,816 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 23:07:18,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 23:07:18,816 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 23:07:18,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 23:07:18,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:18,817 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:18,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 23:07:18,817 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:18,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:18,818 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 23:07:18,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:18,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423373866] [2020-08-21 23:07:18,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:18,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:19,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:19,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:19,817 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:19,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423373866] [2020-08-21 23:07:19,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:19,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 23:07:19,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073796997] [2020-08-21 23:07:19,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 23:07:19,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:19,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 23:07:19,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 23:07:19,819 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 23:07:20,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:20,680 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 23:07:20,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 23:07:20,681 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 23:07:20,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:20,682 INFO L225 Difference]: With dead ends: 53 [2020-08-21 23:07:20,682 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 23:07:20,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 23:07:20,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 23:07:20,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 23:07:20,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 23:07:20,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 23:07:20,690 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 23:07:20,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:20,690 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 23:07:20,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 23:07:20,690 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 23:07:20,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 23:07:20,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:20,691 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:20,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 23:07:20,691 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:20,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:20,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 23:07:20,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:20,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446794381] [2020-08-21 23:07:20,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:20,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:21,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:21,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:21,752 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:21,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446794381] [2020-08-21 23:07:21,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:21,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 23:07:21,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345788079] [2020-08-21 23:07:21,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 23:07:21,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:21,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 23:07:21,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 23:07:21,755 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 23:07:22,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:22,647 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 23:07:22,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 23:07:22,648 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 23:07:22,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:22,648 INFO L225 Difference]: With dead ends: 54 [2020-08-21 23:07:22,649 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 23:07:22,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 23:07:22,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 23:07:22,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 23:07:22,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 23:07:22,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 23:07:22,654 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 23:07:22,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:22,654 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 23:07:22,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 23:07:22,654 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 23:07:22,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 23:07:22,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:22,655 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:22,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 23:07:22,655 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:22,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:22,656 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 23:07:22,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:22,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47838990] [2020-08-21 23:07:22,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:22,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:23,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:23,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:23,784 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:23,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47838990] [2020-08-21 23:07:23,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:23,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 23:07:23,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79406105] [2020-08-21 23:07:23,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 23:07:23,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:23,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 23:07:23,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 23:07:23,786 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 23:07:24,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:24,725 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 23:07:24,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 23:07:24,725 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 23:07:24,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:24,726 INFO L225 Difference]: With dead ends: 55 [2020-08-21 23:07:24,726 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 23:07:24,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 23:07:24,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 23:07:24,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 23:07:24,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 23:07:24,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 23:07:24,731 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 23:07:24,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:24,731 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 23:07:24,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 23:07:24,731 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 23:07:24,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 23:07:24,732 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:24,732 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:24,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 23:07:24,732 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:24,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:24,733 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 23:07:24,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:24,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354166047] [2020-08-21 23:07:24,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:24,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:26,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:26,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:26,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354166047] [2020-08-21 23:07:26,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:26,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 23:07:26,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028842877] [2020-08-21 23:07:26,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 23:07:26,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:26,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 23:07:26,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 23:07:26,026 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 23:07:27,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:27,025 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 23:07:27,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 23:07:27,026 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 23:07:27,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:27,027 INFO L225 Difference]: With dead ends: 56 [2020-08-21 23:07:27,027 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 23:07:27,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 23:07:27,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 23:07:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 23:07:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 23:07:27,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 23:07:27,030 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 23:07:27,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:27,030 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 23:07:27,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 23:07:27,030 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 23:07:27,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 23:07:27,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:27,031 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:27,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 23:07:27,031 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:27,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:27,031 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 23:07:27,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:27,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352407865] [2020-08-21 23:07:27,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:27,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:28,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:28,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:28,256 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:28,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352407865] [2020-08-21 23:07:28,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:28,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 23:07:28,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155210217] [2020-08-21 23:07:28,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 23:07:28,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:28,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 23:07:28,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 23:07:28,258 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 23:07:29,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:29,326 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 23:07:29,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 23:07:29,327 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 23:07:29,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:29,328 INFO L225 Difference]: With dead ends: 57 [2020-08-21 23:07:29,328 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 23:07:29,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 23:07:29,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 23:07:29,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 23:07:29,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 23:07:29,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 23:07:29,332 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 23:07:29,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:29,333 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 23:07:29,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 23:07:29,333 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 23:07:29,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 23:07:29,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:29,333 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:29,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 23:07:29,334 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:29,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:29,334 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 23:07:29,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:29,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871460974] [2020-08-21 23:07:29,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:29,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:30,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:30,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:30,576 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:30,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871460974] [2020-08-21 23:07:30,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:30,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 23:07:30,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398093558] [2020-08-21 23:07:30,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 23:07:30,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:30,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 23:07:30,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 23:07:30,578 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 23:07:31,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:31,691 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 23:07:31,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 23:07:31,692 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 23:07:31,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:31,692 INFO L225 Difference]: With dead ends: 58 [2020-08-21 23:07:31,693 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 23:07:31,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 23:07:31,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 23:07:31,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 23:07:31,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 23:07:31,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 23:07:31,698 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 23:07:31,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:31,699 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 23:07:31,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 23:07:31,699 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 23:07:31,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 23:07:31,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:31,700 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:31,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 23:07:31,700 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:31,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:31,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 23:07:31,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:31,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901791725] [2020-08-21 23:07:31,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:31,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:32,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:32,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:32,996 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:32,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901791725] [2020-08-21 23:07:32,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:32,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 23:07:32,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435324053] [2020-08-21 23:07:32,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 23:07:32,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:32,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 23:07:32,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 23:07:32,998 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 23:07:34,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:34,163 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 23:07:34,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 23:07:34,164 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 23:07:34,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:34,164 INFO L225 Difference]: With dead ends: 59 [2020-08-21 23:07:34,164 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 23:07:34,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 23:07:34,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 23:07:34,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 23:07:34,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 23:07:34,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 23:07:34,169 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 23:07:34,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:34,170 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 23:07:34,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 23:07:34,170 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 23:07:34,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 23:07:34,170 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:34,170 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:34,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 23:07:34,171 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:34,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:34,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 23:07:34,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:34,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269239248] [2020-08-21 23:07:34,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:34,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:35,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:35,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:35,865 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:35,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269239248] [2020-08-21 23:07:35,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:35,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 23:07:35,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370099554] [2020-08-21 23:07:35,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 23:07:35,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:35,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 23:07:35,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 23:07:35,868 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 23:07:37,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:37,053 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 23:07:37,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 23:07:37,053 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 23:07:37,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:37,054 INFO L225 Difference]: With dead ends: 60 [2020-08-21 23:07:37,054 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 23:07:37,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 23:07:37,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 23:07:37,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 23:07:37,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 23:07:37,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 23:07:37,058 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 23:07:37,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:37,058 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 23:07:37,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 23:07:37,058 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 23:07:37,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 23:07:37,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:37,058 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:37,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 23:07:37,059 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:37,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:37,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 23:07:37,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:37,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215751063] [2020-08-21 23:07:37,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:37,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:38,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:38,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:38,525 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:38,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215751063] [2020-08-21 23:07:38,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:38,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 23:07:38,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433677501] [2020-08-21 23:07:38,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 23:07:38,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:38,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 23:07:38,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 23:07:38,527 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 23:07:39,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:39,773 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 23:07:39,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 23:07:39,774 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 23:07:39,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:39,775 INFO L225 Difference]: With dead ends: 61 [2020-08-21 23:07:39,775 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 23:07:39,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 23:07:39,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 23:07:39,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 23:07:39,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 23:07:39,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 23:07:39,779 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 23:07:39,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:39,779 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 23:07:39,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 23:07:39,780 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 23:07:39,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 23:07:39,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:39,780 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:39,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 23:07:39,780 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:39,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:39,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 23:07:39,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:39,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620251458] [2020-08-21 23:07:39,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:39,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:41,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:41,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:41,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:41,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620251458] [2020-08-21 23:07:41,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:41,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 23:07:41,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079754462] [2020-08-21 23:07:41,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 23:07:41,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:41,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 23:07:41,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 23:07:41,308 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 23:07:42,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:42,585 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 23:07:42,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 23:07:42,585 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 23:07:42,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:42,586 INFO L225 Difference]: With dead ends: 62 [2020-08-21 23:07:42,586 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 23:07:42,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 23:07:42,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 23:07:42,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 23:07:42,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 23:07:42,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 23:07:42,591 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 23:07:42,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:42,592 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 23:07:42,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 23:07:42,592 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 23:07:42,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 23:07:42,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:42,592 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:42,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 23:07:42,593 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:42,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:42,593 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 23:07:42,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:42,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483588957] [2020-08-21 23:07:42,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:42,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:44,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:44,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:44,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:44,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483588957] [2020-08-21 23:07:44,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:44,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 23:07:44,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75063245] [2020-08-21 23:07:44,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 23:07:44,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:44,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 23:07:44,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 23:07:44,206 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 23:07:45,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:45,533 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 23:07:45,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 23:07:45,533 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 23:07:45,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:45,534 INFO L225 Difference]: With dead ends: 63 [2020-08-21 23:07:45,534 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 23:07:45,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 23:07:45,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 23:07:45,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 23:07:45,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 23:07:45,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 23:07:45,539 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 23:07:45,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:45,540 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 23:07:45,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 23:07:45,540 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 23:07:45,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 23:07:45,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:45,541 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:45,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 23:07:45,541 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:45,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:45,542 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 23:07:45,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:45,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080088098] [2020-08-21 23:07:45,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:45,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:47,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:47,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:47,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:47,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080088098] [2020-08-21 23:07:47,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:47,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 23:07:47,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690872613] [2020-08-21 23:07:47,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 23:07:47,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:47,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 23:07:47,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 23:07:47,233 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 23:07:48,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:48,672 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 23:07:48,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 23:07:48,674 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 23:07:48,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:48,675 INFO L225 Difference]: With dead ends: 64 [2020-08-21 23:07:48,675 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 23:07:48,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 23:07:48,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 23:07:48,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 23:07:48,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 23:07:48,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 23:07:48,680 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 23:07:48,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:48,680 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 23:07:48,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 23:07:48,681 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 23:07:48,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 23:07:48,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:48,681 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:48,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 23:07:48,682 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:48,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:48,682 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 23:07:48,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:48,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555968327] [2020-08-21 23:07:48,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:48,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:50,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:07:50,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:07:50,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:07:50,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555968327] [2020-08-21 23:07:50,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:07:50,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 23:07:50,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872453752] [2020-08-21 23:07:50,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 23:07:50,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:07:50,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 23:07:50,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 23:07:50,376 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states. [2020-08-21 23:07:51,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:07:51,826 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-08-21 23:07:51,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 23:07:51,826 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 58 [2020-08-21 23:07:51,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:07:51,827 INFO L225 Difference]: With dead ends: 65 [2020-08-21 23:07:51,827 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 23:07:51,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 23:07:51,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 23:07:51,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 23:07:51,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 23:07:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-08-21 23:07:51,832 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-08-21 23:07:51,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:07:51,832 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-08-21 23:07:51,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 23:07:51,833 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-08-21 23:07:51,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 23:07:51,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:07:51,833 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:07:51,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 23:07:51,834 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:07:51,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:07:51,834 INFO L82 PathProgramCache]: Analyzing trace with hash 712317521, now seen corresponding path program 49 times [2020-08-21 23:07:51,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:07:51,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794466697] [2020-08-21 23:07:51,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:07:51,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat