/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 15:06:36,542 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 15:06:36,547 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 15:06:36,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-09-24 15:06:36,615 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 15:06:36,618 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 15:06:36,621 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 15:06:36,623 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 15:06:36,625 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 15:06:36,627 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 15:06:36,628 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 15:06:36,638 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 15:06:36,642 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 15:06:36,643 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 15:06:36,645 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 15:06:36,646 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 15:06:36,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-24 15:06:36,657 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 15:06:36,658 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 15:06:36,659 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 15:06:36,660 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 [2020-09-24 15:06:36,687 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 15:06:36,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 15:06:36,689 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 15:06:36,689 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 15:06:36,689 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 15:06:36,689 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 15:06:36,692 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 15:06:36,692 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 15:06:36,692 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 15:06:36,692 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 15:06:36,693 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 15:06:36,693 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 15:06:36,693 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 15:06:36,693 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 15:06:36,693 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 15:06:36,694 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 15:06:36,694 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 15:06:36,694 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 15:06:36,694 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 15:06:36,694 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 15:06:36,695 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 15:06:36,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 15:06:36,695 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 15:06:36,695 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 15:06:36,695 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 15:06:36,696 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 15:06:36,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 15:06:36,696 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 15:06:36,696 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 15:06:36,696 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-24 15:06:37,251 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 15:06:37,277 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 15:06:37,284 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 15:06:37,286 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 15:06:37,286 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 15:06:37,287 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-09-24 15:06:37,387 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/751ae23e9/6066b7cdf2b54d1592359ceced5bfe68/FLAG39b64307c [2020-09-24 15:06:37,940 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 15:06:37,941 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-09-24 15:06:37,950 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/751ae23e9/6066b7cdf2b54d1592359ceced5bfe68/FLAG39b64307c [2020-09-24 15:06:38,270 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/751ae23e9/6066b7cdf2b54d1592359ceced5bfe68 [2020-09-24 15:06:38,284 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 15:06:38,291 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 15:06:38,292 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 15:06:38,292 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 15:06:38,296 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 15:06:38,297 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,302 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75a18185 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38, skipping insertion in model container [2020-09-24 15:06:38,302 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,311 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 15:06:38,337 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 15:06:38,580 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:06:38,588 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 15:06:38,624 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:06:38,642 INFO L208 MainTranslator]: Completed translation [2020-09-24 15:06:38,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38 WrapperNode [2020-09-24 15:06:38,643 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 15:06:38,644 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 15:06:38,644 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 15:06:38,644 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 15:06:38,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,732 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,743 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (1/1) ... [2020-09-24 15:06:38,756 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 15:06:38,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 15:06:38,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 15:06:38,757 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 15:06:38,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (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 [2020-09-24 15:06:38,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 15:06:38,835 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 15:06:38,836 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-24 15:06:38,836 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-09-24 15:06:38,836 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 15:06:38,836 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-24 15:06:38,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 15:06:38,837 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-24 15:06:38,837 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-24 15:06:38,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-24 15:06:38,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-24 15:06:38,838 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 15:06:38,838 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-24 15:06:38,838 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-24 15:06:38,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-24 15:06:38,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 15:06:38,839 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 15:06:39,188 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 15:06:39,188 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-24 15:06:39,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:06:39 BoogieIcfgContainer [2020-09-24 15:06:39,194 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 15:06:39,195 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 15:06:39,195 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 15:06:39,199 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 15:06:39,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 03:06:38" (1/3) ... [2020-09-24 15:06:39,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f89de89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:06:39, skipping insertion in model container [2020-09-24 15:06:39,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:06:38" (2/3) ... [2020-09-24 15:06:39,201 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f89de89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:06:39, skipping insertion in model container [2020-09-24 15:06:39,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:06:39" (3/3) ... [2020-09-24 15:06:39,203 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-09-24 15:06:39,215 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 15:06:39,225 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 15:06:39,246 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 15:06:39,272 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 15:06:39,272 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 15:06:39,273 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 15:06:39,273 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 15:06:39,273 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 15:06:39,273 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 15:06:39,273 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 15:06:39,273 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 15:06:39,295 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2020-09-24 15:06:39,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-24 15:06:39,303 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:39,304 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:39,304 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:39,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:39,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1392671971, now seen corresponding path program 1 times [2020-09-24 15:06:39,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:39,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290397281] [2020-09-24 15:06:39,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:39,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:39,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:39,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:39,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:39,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:39,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:06:39,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290397281] [2020-09-24 15:06:39,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:06:39,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-24 15:06:39,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467435869] [2020-09-24 15:06:39,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-24 15:06:39,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:39,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-24 15:06:39,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-24 15:06:39,604 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 4 states. [2020-09-24 15:06:39,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:39,858 INFO L93 Difference]: Finished difference Result 94 states and 111 transitions. [2020-09-24 15:06:39,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-24 15:06:39,860 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2020-09-24 15:06:39,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:39,875 INFO L225 Difference]: With dead ends: 94 [2020-09-24 15:06:39,876 INFO L226 Difference]: Without dead ends: 53 [2020-09-24 15:06:39,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:06:39,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-24 15:06:39,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2020-09-24 15:06:39,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-24 15:06:39,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2020-09-24 15:06:39,938 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 29 [2020-09-24 15:06:39,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:39,939 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2020-09-24 15:06:39,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-24 15:06:39,940 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2020-09-24 15:06:39,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-24 15:06:39,941 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:39,942 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:39,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 15:06:39,942 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:39,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:39,943 INFO L82 PathProgramCache]: Analyzing trace with hash 31734745, now seen corresponding path program 1 times [2020-09-24 15:06:39,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:39,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006698055] [2020-09-24 15:06:39,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:39,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:40,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:40,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:06:40,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006698055] [2020-09-24 15:06:40,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:06:40,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-24 15:06:40,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053126948] [2020-09-24 15:06:40,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-24 15:06:40,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:40,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-24 15:06:40,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-24 15:06:40,235 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 7 states. [2020-09-24 15:06:40,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:40,528 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2020-09-24 15:06:40,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-24 15:06:40,528 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2020-09-24 15:06:40,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:40,530 INFO L225 Difference]: With dead ends: 81 [2020-09-24 15:06:40,530 INFO L226 Difference]: Without dead ends: 54 [2020-09-24 15:06:40,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-09-24 15:06:40,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-24 15:06:40,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2020-09-24 15:06:40,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-24 15:06:40,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-09-24 15:06:40,543 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 29 [2020-09-24 15:06:40,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:40,544 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-09-24 15:06:40,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-24 15:06:40,544 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-09-24 15:06:40,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-24 15:06:40,549 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:40,549 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:40,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 15:06:40,550 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:40,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:40,550 INFO L82 PathProgramCache]: Analyzing trace with hash -579567659, now seen corresponding path program 1 times [2020-09-24 15:06:40,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:40,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [236814380] [2020-09-24 15:06:40,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:40,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:40,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:40,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:40,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:06:40,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [236814380] [2020-09-24 15:06:40,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:40,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-24 15:06:40,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137978342] [2020-09-24 15:06:40,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-24 15:06:40,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:40,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-24 15:06:40,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-24 15:06:40,819 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 9 states. [2020-09-24 15:06:41,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:41,147 INFO L93 Difference]: Finished difference Result 87 states and 95 transitions. [2020-09-24 15:06:41,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-24 15:06:41,148 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-09-24 15:06:41,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:41,149 INFO L225 Difference]: With dead ends: 87 [2020-09-24 15:06:41,150 INFO L226 Difference]: Without dead ends: 60 [2020-09-24 15:06:41,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-09-24 15:06:41,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-24 15:06:41,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2020-09-24 15:06:41,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-24 15:06:41,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-09-24 15:06:41,160 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 35 [2020-09-24 15:06:41,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:41,161 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-09-24 15:06:41,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-24 15:06:41,161 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-09-24 15:06:41,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-24 15:06:41,163 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:41,163 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:41,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 15:06:41,164 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:41,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:41,164 INFO L82 PathProgramCache]: Analyzing trace with hash 556324561, now seen corresponding path program 2 times [2020-09-24 15:06:41,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:41,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621276278] [2020-09-24 15:06:41,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:41,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:41,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:41,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,256 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-24 15:06:41,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621276278] [2020-09-24 15:06:41,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:06:41,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 15:06:41,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141997340] [2020-09-24 15:06:41,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 15:06:41,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:41,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 15:06:41,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:06:41,259 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 5 states. [2020-09-24 15:06:41,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:41,402 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2020-09-24 15:06:41,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-24 15:06:41,403 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2020-09-24 15:06:41,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:41,406 INFO L225 Difference]: With dead ends: 86 [2020-09-24 15:06:41,406 INFO L226 Difference]: Without dead ends: 71 [2020-09-24 15:06:41,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-24 15:06:41,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-09-24 15:06:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 57. [2020-09-24 15:06:41,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-24 15:06:41,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2020-09-24 15:06:41,422 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 41 [2020-09-24 15:06:41,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:41,422 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2020-09-24 15:06:41,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 15:06:41,423 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2020-09-24 15:06:41,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-24 15:06:41,424 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:41,424 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:41,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-24 15:06:41,425 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:41,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:41,425 INFO L82 PathProgramCache]: Analyzing trace with hash 272366111, now seen corresponding path program 1 times [2020-09-24 15:06:41,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:41,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687478236] [2020-09-24 15:06:41,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:41,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:41,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:41,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,536 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-24 15:06:41,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687478236] [2020-09-24 15:06:41,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:41,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-24 15:06:41,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851270157] [2020-09-24 15:06:41,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-24 15:06:41,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:41,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-24 15:06:41,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-24 15:06:41,540 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 7 states. [2020-09-24 15:06:41,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:41,729 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2020-09-24 15:06:41,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-24 15:06:41,730 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 48 [2020-09-24 15:06:41,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:41,732 INFO L225 Difference]: With dead ends: 95 [2020-09-24 15:06:41,732 INFO L226 Difference]: Without dead ends: 80 [2020-09-24 15:06:41,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-09-24 15:06:41,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-24 15:06:41,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2020-09-24 15:06:41,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-24 15:06:41,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2020-09-24 15:06:41,742 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 48 [2020-09-24 15:06:41,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:41,742 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2020-09-24 15:06:41,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-24 15:06:41,743 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2020-09-24 15:06:41,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-24 15:06:41,744 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:41,745 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:41,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-24 15:06:41,745 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:41,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:41,746 INFO L82 PathProgramCache]: Analyzing trace with hash 92742417, now seen corresponding path program 2 times [2020-09-24 15:06:41,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:41,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258006485] [2020-09-24 15:06:41,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:41,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:41,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:41,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:41,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:42,119 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:42,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258006485] [2020-09-24 15:06:42,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:42,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-24 15:06:42,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233498445] [2020-09-24 15:06:42,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-24 15:06:42,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:42,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-24 15:06:42,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-24 15:06:42,123 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 11 states. [2020-09-24 15:06:42,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:42,570 INFO L93 Difference]: Finished difference Result 113 states and 123 transitions. [2020-09-24 15:06:42,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-24 15:06:42,571 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2020-09-24 15:06:42,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:42,573 INFO L225 Difference]: With dead ends: 113 [2020-09-24 15:06:42,574 INFO L226 Difference]: Without dead ends: 76 [2020-09-24 15:06:42,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2020-09-24 15:06:42,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-24 15:06:42,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2020-09-24 15:06:42,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-09-24 15:06:42,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2020-09-24 15:06:42,589 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 55 [2020-09-24 15:06:42,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:42,589 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2020-09-24 15:06:42,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-24 15:06:42,589 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2020-09-24 15:06:42,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-09-24 15:06:42,594 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:42,594 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:42,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-24 15:06:42,594 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:42,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:42,596 INFO L82 PathProgramCache]: Analyzing trace with hash 809903117, now seen corresponding path program 3 times [2020-09-24 15:06:42,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:42,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691491134] [2020-09-24 15:06:42,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:42,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:42,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:42,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:42,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:42,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:43,099 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:43,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691491134] [2020-09-24 15:06:43,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:43,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-24 15:06:43,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366085055] [2020-09-24 15:06:43,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-24 15:06:43,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:43,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-24 15:06:43,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2020-09-24 15:06:43,101 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 13 states. [2020-09-24 15:06:43,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:43,603 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-09-24 15:06:43,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-24 15:06:43,604 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-09-24 15:06:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:43,605 INFO L225 Difference]: With dead ends: 119 [2020-09-24 15:06:43,605 INFO L226 Difference]: Without dead ends: 82 [2020-09-24 15:06:43,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=369, Unknown=0, NotChecked=0, Total=506 [2020-09-24 15:06:43,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-24 15:06:43,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2020-09-24 15:06:43,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-24 15:06:43,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2020-09-24 15:06:43,619 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 61 [2020-09-24 15:06:43,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:43,621 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2020-09-24 15:06:43,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-24 15:06:43,621 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2020-09-24 15:06:43,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-09-24 15:06:43,623 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:43,623 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:43,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-24 15:06:43,623 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:43,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:43,625 INFO L82 PathProgramCache]: Analyzing trace with hash 577206281, now seen corresponding path program 4 times [2020-09-24 15:06:43,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:43,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490266953] [2020-09-24 15:06:43,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:43,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:43,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:43,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:43,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:43,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:44,194 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:44,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490266953] [2020-09-24 15:06:44,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:44,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-24 15:06:44,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083109278] [2020-09-24 15:06:44,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-24 15:06:44,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:44,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-24 15:06:44,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2020-09-24 15:06:44,197 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 15 states. [2020-09-24 15:06:44,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:44,809 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2020-09-24 15:06:44,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-24 15:06:44,810 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2020-09-24 15:06:44,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:44,812 INFO L225 Difference]: With dead ends: 125 [2020-09-24 15:06:44,812 INFO L226 Difference]: Without dead ends: 88 [2020-09-24 15:06:44,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=191, Invalid=511, Unknown=0, NotChecked=0, Total=702 [2020-09-24 15:06:44,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-24 15:06:44,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2020-09-24 15:06:44,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-09-24 15:06:44,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 89 transitions. [2020-09-24 15:06:44,836 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 89 transitions. Word has length 67 [2020-09-24 15:06:44,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:44,837 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 89 transitions. [2020-09-24 15:06:44,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-24 15:06:44,838 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 89 transitions. [2020-09-24 15:06:44,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-09-24 15:06:44,839 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:44,839 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:44,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-24 15:06:44,840 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:44,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:44,841 INFO L82 PathProgramCache]: Analyzing trace with hash -274669819, now seen corresponding path program 5 times [2020-09-24 15:06:44,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:44,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413309747] [2020-09-24 15:06:44,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:44,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:44,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:44,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:44,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:44,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:45,391 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:45,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413309747] [2020-09-24 15:06:45,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:45,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-24 15:06:45,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786593797] [2020-09-24 15:06:45,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-24 15:06:45,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:45,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-24 15:06:45,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2020-09-24 15:06:45,395 INFO L87 Difference]: Start difference. First operand 84 states and 89 transitions. Second operand 17 states. [2020-09-24 15:06:46,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:46,060 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-09-24 15:06:46,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-24 15:06:46,061 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 73 [2020-09-24 15:06:46,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:46,062 INFO L225 Difference]: With dead ends: 131 [2020-09-24 15:06:46,062 INFO L226 Difference]: Without dead ends: 94 [2020-09-24 15:06:46,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=255, Invalid=675, Unknown=0, NotChecked=0, Total=930 [2020-09-24 15:06:46,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-24 15:06:46,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2020-09-24 15:06:46,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-09-24 15:06:46,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2020-09-24 15:06:46,070 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 73 [2020-09-24 15:06:46,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:46,070 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2020-09-24 15:06:46,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-24 15:06:46,071 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2020-09-24 15:06:46,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-09-24 15:06:46,071 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:46,072 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:46,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-24 15:06:46,072 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:46,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:46,073 INFO L82 PathProgramCache]: Analyzing trace with hash -61335295, now seen corresponding path program 6 times [2020-09-24 15:06:46,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:46,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87810143] [2020-09-24 15:06:46,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:46,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:46,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:46,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:46,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:46,817 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:46,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87810143] [2020-09-24 15:06:46,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:46,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-24 15:06:46,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91347576] [2020-09-24 15:06:46,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-24 15:06:46,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:46,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-24 15:06:46,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2020-09-24 15:06:46,820 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand 19 states. [2020-09-24 15:06:47,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:47,742 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2020-09-24 15:06:47,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-24 15:06:47,742 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-09-24 15:06:47,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:47,744 INFO L225 Difference]: With dead ends: 137 [2020-09-24 15:06:47,744 INFO L226 Difference]: Without dead ends: 100 [2020-09-24 15:06:47,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2020-09-24 15:06:47,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-09-24 15:06:47,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2020-09-24 15:06:47,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-09-24 15:06:47,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2020-09-24 15:06:47,752 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 79 [2020-09-24 15:06:47,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:47,752 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2020-09-24 15:06:47,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-24 15:06:47,753 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2020-09-24 15:06:47,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-09-24 15:06:47,754 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:47,754 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:47,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-24 15:06:47,754 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:47,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:47,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1180506627, now seen corresponding path program 7 times [2020-09-24 15:06:47,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:47,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076086775] [2020-09-24 15:06:47,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:47,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:47,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:47,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:47,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:47,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:48,546 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:48,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076086775] [2020-09-24 15:06:48,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:48,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-24 15:06:48,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059564598] [2020-09-24 15:06:48,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-24 15:06:48,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:48,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-24 15:06:48,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2020-09-24 15:06:48,549 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand 21 states. [2020-09-24 15:06:49,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:49,614 INFO L93 Difference]: Finished difference Result 143 states and 153 transitions. [2020-09-24 15:06:49,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-24 15:06:49,615 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 85 [2020-09-24 15:06:49,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:49,616 INFO L225 Difference]: With dead ends: 143 [2020-09-24 15:06:49,616 INFO L226 Difference]: Without dead ends: 106 [2020-09-24 15:06:49,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=413, Invalid=1069, Unknown=0, NotChecked=0, Total=1482 [2020-09-24 15:06:49,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-09-24 15:06:49,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2020-09-24 15:06:49,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-09-24 15:06:49,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 107 transitions. [2020-09-24 15:06:49,624 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 107 transitions. Word has length 85 [2020-09-24 15:06:49,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:49,624 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 107 transitions. [2020-09-24 15:06:49,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-24 15:06:49,624 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 107 transitions. [2020-09-24 15:06:49,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-09-24 15:06:49,625 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:49,625 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:49,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-24 15:06:49,626 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:49,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:49,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1632044537, now seen corresponding path program 8 times [2020-09-24 15:06:49,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:49,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419003417] [2020-09-24 15:06:49,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:49,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:49,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:49,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:49,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:49,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:50,508 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:50,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419003417] [2020-09-24 15:06:50,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:50,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-24 15:06:50,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667588034] [2020-09-24 15:06:50,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-24 15:06:50,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:50,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-24 15:06:50,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2020-09-24 15:06:50,511 INFO L87 Difference]: Start difference. First operand 102 states and 107 transitions. Second operand 23 states. [2020-09-24 15:06:51,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:51,650 INFO L93 Difference]: Finished difference Result 149 states and 159 transitions. [2020-09-24 15:06:51,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-24 15:06:51,650 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 91 [2020-09-24 15:06:51,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:51,652 INFO L225 Difference]: With dead ends: 149 [2020-09-24 15:06:51,652 INFO L226 Difference]: Without dead ends: 112 [2020-09-24 15:06:51,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=507, Invalid=1299, Unknown=0, NotChecked=0, Total=1806 [2020-09-24 15:06:51,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-24 15:06:51,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2020-09-24 15:06:51,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-09-24 15:06:51,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 113 transitions. [2020-09-24 15:06:51,663 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 113 transitions. Word has length 91 [2020-09-24 15:06:51,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:51,663 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 113 transitions. [2020-09-24 15:06:51,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-24 15:06:51,664 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 113 transitions. [2020-09-24 15:06:51,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-09-24 15:06:51,665 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:51,665 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:51,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-24 15:06:51,677 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:51,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:51,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1313195787, now seen corresponding path program 9 times [2020-09-24 15:06:51,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:51,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379316592] [2020-09-24 15:06:51,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:51,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:51,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:51,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:51,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:51,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:52,780 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:52,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379316592] [2020-09-24 15:06:52,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:52,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-24 15:06:52,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891529697] [2020-09-24 15:06:52,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-24 15:06:52,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:52,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-24 15:06:52,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=453, Unknown=0, NotChecked=0, Total=600 [2020-09-24 15:06:52,785 INFO L87 Difference]: Start difference. First operand 108 states and 113 transitions. Second operand 25 states. [2020-09-24 15:06:53,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:53,904 INFO L93 Difference]: Finished difference Result 155 states and 165 transitions. [2020-09-24 15:06:53,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-24 15:06:53,905 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 97 [2020-09-24 15:06:53,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:53,906 INFO L225 Difference]: With dead ends: 155 [2020-09-24 15:06:53,906 INFO L226 Difference]: Without dead ends: 118 [2020-09-24 15:06:53,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=611, Invalid=1551, Unknown=0, NotChecked=0, Total=2162 [2020-09-24 15:06:53,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-09-24 15:06:53,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2020-09-24 15:06:53,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-09-24 15:06:53,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-09-24 15:06:53,914 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 97 [2020-09-24 15:06:53,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:53,914 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-09-24 15:06:53,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-24 15:06:53,914 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-09-24 15:06:53,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-09-24 15:06:53,915 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:53,915 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:53,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-24 15:06:53,916 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:53,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:53,916 INFO L82 PathProgramCache]: Analyzing trace with hash -1440596239, now seen corresponding path program 10 times [2020-09-24 15:06:53,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:53,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659747706] [2020-09-24 15:06:53,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:53,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:53,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:53,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:54,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:55,172 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:55,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659747706] [2020-09-24 15:06:55,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:55,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-24 15:06:55,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788036653] [2020-09-24 15:06:55,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-24 15:06:55,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:55,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-24 15:06:55,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=530, Unknown=0, NotChecked=0, Total=702 [2020-09-24 15:06:55,174 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand 27 states. [2020-09-24 15:06:56,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:56,676 INFO L93 Difference]: Finished difference Result 161 states and 171 transitions. [2020-09-24 15:06:56,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-24 15:06:56,676 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 103 [2020-09-24 15:06:56,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:56,678 INFO L225 Difference]: With dead ends: 161 [2020-09-24 15:06:56,678 INFO L226 Difference]: Without dead ends: 124 [2020-09-24 15:06:56,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=725, Invalid=1825, Unknown=0, NotChecked=0, Total=2550 [2020-09-24 15:06:56,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-09-24 15:06:56,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2020-09-24 15:06:56,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-09-24 15:06:56,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 125 transitions. [2020-09-24 15:06:56,686 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 125 transitions. Word has length 103 [2020-09-24 15:06:56,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:56,686 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 125 transitions. [2020-09-24 15:06:56,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-24 15:06:56,686 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 125 transitions. [2020-09-24 15:06:56,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-09-24 15:06:56,688 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:56,688 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:56,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-24 15:06:56,688 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:56,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:56,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1179965421, now seen corresponding path program 11 times [2020-09-24 15:06:56,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:56,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144585225] [2020-09-24 15:06:56,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:56,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:56,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:56,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:56,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:56,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:58,233 INFO L134 CoverageAnalysis]: Checked inductivity of 350 backedges. 0 proven. 341 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:06:58,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144585225] [2020-09-24 15:06:58,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:06:58,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-24 15:06:58,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142099685] [2020-09-24 15:06:58,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-24 15:06:58,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:06:58,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-24 15:06:58,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=613, Unknown=0, NotChecked=0, Total=812 [2020-09-24 15:06:58,237 INFO L87 Difference]: Start difference. First operand 120 states and 125 transitions. Second operand 29 states. [2020-09-24 15:06:59,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:06:59,657 INFO L93 Difference]: Finished difference Result 167 states and 177 transitions. [2020-09-24 15:06:59,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-24 15:06:59,658 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 109 [2020-09-24 15:06:59,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:06:59,659 INFO L225 Difference]: With dead ends: 167 [2020-09-24 15:06:59,659 INFO L226 Difference]: Without dead ends: 130 [2020-09-24 15:06:59,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=849, Invalid=2121, Unknown=0, NotChecked=0, Total=2970 [2020-09-24 15:06:59,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-09-24 15:06:59,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2020-09-24 15:06:59,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-09-24 15:06:59,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 131 transitions. [2020-09-24 15:06:59,669 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 131 transitions. Word has length 109 [2020-09-24 15:06:59,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:06:59,669 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 131 transitions. [2020-09-24 15:06:59,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-24 15:06:59,669 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 131 transitions. [2020-09-24 15:06:59,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-09-24 15:06:59,670 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:06:59,671 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:06:59,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-24 15:06:59,671 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:06:59,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:06:59,672 INFO L82 PathProgramCache]: Analyzing trace with hash 987218921, now seen corresponding path program 12 times [2020-09-24 15:06:59,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:06:59,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327420503] [2020-09-24 15:06:59,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:06:59,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:59,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:06:59,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:06:59,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:06:59,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:01,265 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:01,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327420503] [2020-09-24 15:07:01,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:01,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-24 15:07:01,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419269806] [2020-09-24 15:07:01,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-24 15:07:01,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:01,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-24 15:07:01,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=702, Unknown=0, NotChecked=0, Total=930 [2020-09-24 15:07:01,268 INFO L87 Difference]: Start difference. First operand 126 states and 131 transitions. Second operand 31 states. [2020-09-24 15:07:02,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:02,895 INFO L93 Difference]: Finished difference Result 173 states and 183 transitions. [2020-09-24 15:07:02,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-24 15:07:02,895 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 115 [2020-09-24 15:07:02,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:02,897 INFO L225 Difference]: With dead ends: 173 [2020-09-24 15:07:02,897 INFO L226 Difference]: Without dead ends: 136 [2020-09-24 15:07:02,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=983, Invalid=2439, Unknown=0, NotChecked=0, Total=3422 [2020-09-24 15:07:02,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-09-24 15:07:02,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2020-09-24 15:07:02,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-09-24 15:07:02,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 137 transitions. [2020-09-24 15:07:02,912 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 137 transitions. Word has length 115 [2020-09-24 15:07:02,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:02,912 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 137 transitions. [2020-09-24 15:07:02,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-24 15:07:02,913 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 137 transitions. [2020-09-24 15:07:02,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-09-24 15:07:02,914 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:02,914 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:02,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-24 15:07:02,915 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:02,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:02,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1327447323, now seen corresponding path program 13 times [2020-09-24 15:07:02,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:02,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506852282] [2020-09-24 15:07:02,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:02,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:03,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:03,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:03,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:03,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:04,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506852282] [2020-09-24 15:07:04,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:04,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-24 15:07:04,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208772596] [2020-09-24 15:07:04,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-24 15:07:04,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:04,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-24 15:07:04,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=797, Unknown=0, NotChecked=0, Total=1056 [2020-09-24 15:07:04,594 INFO L87 Difference]: Start difference. First operand 132 states and 137 transitions. Second operand 33 states. [2020-09-24 15:07:06,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:06,432 INFO L93 Difference]: Finished difference Result 179 states and 189 transitions. [2020-09-24 15:07:06,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-09-24 15:07:06,433 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 121 [2020-09-24 15:07:06,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:06,435 INFO L225 Difference]: With dead ends: 179 [2020-09-24 15:07:06,435 INFO L226 Difference]: Without dead ends: 142 [2020-09-24 15:07:06,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1127, Invalid=2779, Unknown=0, NotChecked=0, Total=3906 [2020-09-24 15:07:06,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-09-24 15:07:06,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2020-09-24 15:07:06,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-09-24 15:07:06,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2020-09-24 15:07:06,442 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 121 [2020-09-24 15:07:06,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:06,442 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2020-09-24 15:07:06,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-24 15:07:06,443 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2020-09-24 15:07:06,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-09-24 15:07:06,444 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:06,444 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:06,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-24 15:07:06,445 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:06,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:06,445 INFO L82 PathProgramCache]: Analyzing trace with hash 39163105, now seen corresponding path program 14 times [2020-09-24 15:07:06,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:06,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299402065] [2020-09-24 15:07:06,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:06,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:06,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:06,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:06,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:06,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 0 proven. 560 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:08,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299402065] [2020-09-24 15:07:08,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:08,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-24 15:07:08,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018804640] [2020-09-24 15:07:08,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-24 15:07:08,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:08,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-24 15:07:08,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=898, Unknown=0, NotChecked=0, Total=1190 [2020-09-24 15:07:08,398 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand 35 states. [2020-09-24 15:07:10,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:10,679 INFO L93 Difference]: Finished difference Result 185 states and 195 transitions. [2020-09-24 15:07:10,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-09-24 15:07:10,680 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 127 [2020-09-24 15:07:10,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:10,681 INFO L225 Difference]: With dead ends: 185 [2020-09-24 15:07:10,681 INFO L226 Difference]: Without dead ends: 148 [2020-09-24 15:07:10,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1281, Invalid=3141, Unknown=0, NotChecked=0, Total=4422 [2020-09-24 15:07:10,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-09-24 15:07:10,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2020-09-24 15:07:10,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-09-24 15:07:10,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 149 transitions. [2020-09-24 15:07:10,690 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 149 transitions. Word has length 127 [2020-09-24 15:07:10,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:10,691 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 149 transitions. [2020-09-24 15:07:10,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-24 15:07:10,691 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 149 transitions. [2020-09-24 15:07:10,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-09-24 15:07:10,692 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:10,693 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:10,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-24 15:07:10,693 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:10,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:10,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1976302045, now seen corresponding path program 15 times [2020-09-24 15:07:10,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:10,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371793347] [2020-09-24 15:07:10,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:10,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:10,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:10,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:10,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:10,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:12,703 INFO L134 CoverageAnalysis]: Checked inductivity of 654 backedges. 0 proven. 645 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:12,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371793347] [2020-09-24 15:07:12,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:12,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-24 15:07:12,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931525057] [2020-09-24 15:07:12,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-24 15:07:12,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:12,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-24 15:07:12,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1005, Unknown=0, NotChecked=0, Total=1332 [2020-09-24 15:07:12,706 INFO L87 Difference]: Start difference. First operand 144 states and 149 transitions. Second operand 37 states. [2020-09-24 15:07:14,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:14,848 INFO L93 Difference]: Finished difference Result 191 states and 201 transitions. [2020-09-24 15:07:14,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-09-24 15:07:14,849 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 133 [2020-09-24 15:07:14,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:14,851 INFO L225 Difference]: With dead ends: 191 [2020-09-24 15:07:14,851 INFO L226 Difference]: Without dead ends: 154 [2020-09-24 15:07:14,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1445, Invalid=3525, Unknown=0, NotChecked=0, Total=4970 [2020-09-24 15:07:14,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-09-24 15:07:14,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2020-09-24 15:07:14,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-09-24 15:07:14,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 155 transitions. [2020-09-24 15:07:14,860 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 155 transitions. Word has length 133 [2020-09-24 15:07:14,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:14,860 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 155 transitions. [2020-09-24 15:07:14,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-24 15:07:14,860 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 155 transitions. [2020-09-24 15:07:14,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-09-24 15:07:14,862 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:14,862 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:14,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-24 15:07:14,862 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:14,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:14,863 INFO L82 PathProgramCache]: Analyzing trace with hash -91639335, now seen corresponding path program 16 times [2020-09-24 15:07:14,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:14,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559219989] [2020-09-24 15:07:14,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:14,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:14,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:14,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:14,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:14,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:17,174 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:17,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559219989] [2020-09-24 15:07:17,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:17,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-24 15:07:17,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179501999] [2020-09-24 15:07:17,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-24 15:07:17,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:17,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-24 15:07:17,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1118, Unknown=0, NotChecked=0, Total=1482 [2020-09-24 15:07:17,177 INFO L87 Difference]: Start difference. First operand 150 states and 155 transitions. Second operand 39 states. [2020-09-24 15:07:19,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:19,782 INFO L93 Difference]: Finished difference Result 197 states and 207 transitions. [2020-09-24 15:07:19,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-09-24 15:07:19,783 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 139 [2020-09-24 15:07:19,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:19,784 INFO L225 Difference]: With dead ends: 197 [2020-09-24 15:07:19,785 INFO L226 Difference]: Without dead ends: 160 [2020-09-24 15:07:19,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1619, Invalid=3931, Unknown=0, NotChecked=0, Total=5550 [2020-09-24 15:07:19,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-09-24 15:07:19,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2020-09-24 15:07:19,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-09-24 15:07:19,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 161 transitions. [2020-09-24 15:07:19,793 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 161 transitions. Word has length 139 [2020-09-24 15:07:19,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:19,793 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 161 transitions. [2020-09-24 15:07:19,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-24 15:07:19,794 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 161 transitions. [2020-09-24 15:07:19,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-09-24 15:07:19,795 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:19,796 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:19,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-24 15:07:19,796 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:19,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:19,796 INFO L82 PathProgramCache]: Analyzing trace with hash -461079339, now seen corresponding path program 17 times [2020-09-24 15:07:19,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:19,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163309454] [2020-09-24 15:07:19,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:19,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:19,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:19,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:19,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:19,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:22,279 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:22,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163309454] [2020-09-24 15:07:22,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:22,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-24 15:07:22,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407935887] [2020-09-24 15:07:22,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-24 15:07:22,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:22,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-24 15:07:22,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1237, Unknown=0, NotChecked=0, Total=1640 [2020-09-24 15:07:22,282 INFO L87 Difference]: Start difference. First operand 156 states and 161 transitions. Second operand 41 states. [2020-09-24 15:07:25,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:25,203 INFO L93 Difference]: Finished difference Result 203 states and 213 transitions. [2020-09-24 15:07:25,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-09-24 15:07:25,204 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-09-24 15:07:25,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:25,205 INFO L225 Difference]: With dead ends: 203 [2020-09-24 15:07:25,205 INFO L226 Difference]: Without dead ends: 166 [2020-09-24 15:07:25,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1074 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1803, Invalid=4359, Unknown=0, NotChecked=0, Total=6162 [2020-09-24 15:07:25,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-09-24 15:07:25,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2020-09-24 15:07:25,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-09-24 15:07:25,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 167 transitions. [2020-09-24 15:07:25,213 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 167 transitions. Word has length 145 [2020-09-24 15:07:25,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:25,213 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 167 transitions. [2020-09-24 15:07:25,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-24 15:07:25,214 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 167 transitions. [2020-09-24 15:07:25,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2020-09-24 15:07:25,214 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:25,215 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:25,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-24 15:07:25,215 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:25,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:25,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1469965615, now seen corresponding path program 18 times [2020-09-24 15:07:25,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:25,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836381699] [2020-09-24 15:07:25,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:25,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:25,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:25,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:25,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:25,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:27,925 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 936 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:27,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836381699] [2020-09-24 15:07:27,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:27,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-24 15:07:27,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36885929] [2020-09-24 15:07:27,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-24 15:07:27,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:27,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-24 15:07:27,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=1362, Unknown=0, NotChecked=0, Total=1806 [2020-09-24 15:07:27,928 INFO L87 Difference]: Start difference. First operand 162 states and 167 transitions. Second operand 43 states. [2020-09-24 15:07:30,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:30,622 INFO L93 Difference]: Finished difference Result 209 states and 219 transitions. [2020-09-24 15:07:30,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-09-24 15:07:30,625 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 151 [2020-09-24 15:07:30,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:30,626 INFO L225 Difference]: With dead ends: 209 [2020-09-24 15:07:30,626 INFO L226 Difference]: Without dead ends: 172 [2020-09-24 15:07:30,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1997, Invalid=4809, Unknown=0, NotChecked=0, Total=6806 [2020-09-24 15:07:30,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-09-24 15:07:30,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2020-09-24 15:07:30,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-09-24 15:07:30,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 173 transitions. [2020-09-24 15:07:30,635 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 173 transitions. Word has length 151 [2020-09-24 15:07:30,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:30,635 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 173 transitions. [2020-09-24 15:07:30,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-24 15:07:30,635 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 173 transitions. [2020-09-24 15:07:30,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-09-24 15:07:30,637 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:30,637 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:30,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-24 15:07:30,637 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:30,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:30,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1753723955, now seen corresponding path program 19 times [2020-09-24 15:07:30,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:30,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062211631] [2020-09-24 15:07:30,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:30,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:30,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 15:07:30,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:33,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 0 proven. 1045 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-24 15:07:33,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062211631] [2020-09-24 15:07:33,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:33,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-24 15:07:33,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495825652] [2020-09-24 15:07:33,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-24 15:07:33,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:33,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-24 15:07:33,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=1493, Unknown=0, NotChecked=0, Total=1980 [2020-09-24 15:07:33,493 INFO L87 Difference]: Start difference. First operand 168 states and 173 transitions. Second operand 45 states. [2020-09-24 15:07:36,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:36,519 INFO L93 Difference]: Finished difference Result 215 states and 225 transitions. [2020-09-24 15:07:36,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-09-24 15:07:36,520 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 157 [2020-09-24 15:07:36,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:36,521 INFO L225 Difference]: With dead ends: 215 [2020-09-24 15:07:36,521 INFO L226 Difference]: Without dead ends: 178 [2020-09-24 15:07:36,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=2201, Invalid=5281, Unknown=0, NotChecked=0, Total=7482 [2020-09-24 15:07:36,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-09-24 15:07:36,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2020-09-24 15:07:36,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-09-24 15:07:36,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 179 transitions. [2020-09-24 15:07:36,528 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 179 transitions. Word has length 157 [2020-09-24 15:07:36,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:36,528 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 179 transitions. [2020-09-24 15:07:36,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-24 15:07:36,528 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 179 transitions. [2020-09-24 15:07:36,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-09-24 15:07:36,529 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:36,530 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:07:36,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-24 15:07:36,530 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:36,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:36,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1681076279, now seen corresponding path program 20 times [2020-09-24 15:07:36,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:36,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122713389] [2020-09-24 15:07:36,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:36,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat