/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:54:22,172 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 17:54:22,209 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:54:22,209 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:54:22,210 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:54:22,212 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:54:22,213 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:54:22,214 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:54:22,215 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:54:22,217 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:54:22,219 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:54:22,220 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:54:22,221 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:54:22,222 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:54:22,224 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:54:22,237 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:54:22,238 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:54:22,244 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:54:22,245 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 17:54:22,291 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:54:22,291 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:54:22,292 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:54:22,293 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:54:22,293 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:54:22,293 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:54:22,293 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:54:22,294 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:54:22,294 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:54:22,295 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:54:22,295 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:54:22,295 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:54:22,295 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:54:22,296 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:54:22,297 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:54:22,297 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:54:22,297 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:54:22,297 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:54:22,298 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:54:22,298 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:54:22,298 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:54:22,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:54:22,298 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:54:22,299 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:54:22,300 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 17:54:22,657 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:54:22,675 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:54:22,678 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:54:22,680 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:54:22,680 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:54:22,681 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 17:54:22,744 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d7a89f58e/0de54775ecbb40fbbbe98224f1805ac3/FLAG51473546e [2020-08-18 17:54:23,228 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:54:23,229 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 17:54:23,236 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d7a89f58e/0de54775ecbb40fbbbe98224f1805ac3/FLAG51473546e [2020-08-18 17:54:23,632 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d7a89f58e/0de54775ecbb40fbbbe98224f1805ac3 [2020-08-18 17:54:23,643 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:54:23,645 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:54:23,647 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:54:23,647 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:54:23,651 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:54:23,653 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:54:23" (1/1) ... [2020-08-18 17:54:23,657 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6171eb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:23, skipping insertion in model container [2020-08-18 17:54:23,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:54:23" (1/1) ... [2020-08-18 17:54:23,667 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:54:23,689 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:54:23,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:54:23,911 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:54:23,953 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:54:24,059 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:54:24,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24 WrapperNode [2020-08-18 17:54:24,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:54:24,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:54:24,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:54:24,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:54:24,072 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,085 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,085 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,102 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,111 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,113 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... [2020-08-18 17:54:24,115 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:54:24,116 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:54:24,116 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:54:24,116 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:54:24,117 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:54:24,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:54:24,185 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:54:24,185 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 17:54:24,185 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:54:24,186 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:54:24,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:54:24,531 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:54:24,531 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 17:54:24,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:54:24 BoogieIcfgContainer [2020-08-18 17:54:24,535 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:54:24,537 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:54:24,537 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:54:24,540 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:54:24,540 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:54:23" (1/3) ... [2020-08-18 17:54:24,541 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a3caec1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:54:24, skipping insertion in model container [2020-08-18 17:54:24,541 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:54:24" (2/3) ... [2020-08-18 17:54:24,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a3caec1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:54:24, skipping insertion in model container [2020-08-18 17:54:24,542 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:54:24" (3/3) ... [2020-08-18 17:54:24,544 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 17:54:24,554 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:54:24,575 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:54:24,593 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:54:24,619 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:54:24,619 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:54:24,619 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:54:24,619 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:54:24,619 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:54:24,620 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:54:24,620 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:54:24,620 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:54:24,639 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 17:54:24,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 17:54:24,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:24,646 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:24,646 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:24,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:24,651 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 17:54:24,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:24,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751424866] [2020-08-18 17:54:24,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:24,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:24,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:24,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:24,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:54:24,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:24,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:24,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751424866] [2020-08-18 17:54:24,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:54:24,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:54:24,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402989208] [2020-08-18 17:54:24,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:54:24,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:24,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:54:24,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:54:24,901 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 17:54:25,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:25,003 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 17:54:25,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:54:25,005 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 17:54:25,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:25,014 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:54:25,014 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 17:54:25,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:54:25,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 17:54:25,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 17:54:25,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 17:54:25,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 17:54:25,050 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 17:54:25,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:25,051 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 17:54:25,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:54:25,051 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 17:54:25,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 17:54:25,052 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:25,052 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:25,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:54:25,053 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:25,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:25,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 17:54:25,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:25,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494579129] [2020-08-18 17:54:25,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:25,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:25,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 17:54:25,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:25,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494579129] [2020-08-18 17:54:25,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:54:25,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:54:25,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437014690] [2020-08-18 17:54:25,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:54:25,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:25,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:54:25,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:54:25,183 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 17:54:25,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:25,240 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 17:54:25,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:54:25,241 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 17:54:25,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:25,242 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:54:25,242 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 17:54:25,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:54:25,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 17:54:25,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 17:54:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:54:25,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 17:54:25,250 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 17:54:25,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:25,251 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 17:54:25,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:54:25,251 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 17:54:25,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:54:25,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:25,252 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] [2020-08-18 17:54:25,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:54:25,253 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:25,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:25,254 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 17:54:25,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:25,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174229004] [2020-08-18 17:54:25,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:25,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:25,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 17:54:25,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:25,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174229004] [2020-08-18 17:54:25,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:25,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:54:25,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975686328] [2020-08-18 17:54:25,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:54:25,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:25,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:54:25,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:54:25,358 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 17:54:25,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:25,446 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 17:54:25,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:54:25,447 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 17:54:25,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:25,448 INFO L225 Difference]: With dead ends: 36 [2020-08-18 17:54:25,448 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 17:54:25,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:54:25,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 17:54:25,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 17:54:25,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 17:54:25,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 17:54:25,456 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 17:54:25,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:25,456 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 17:54:25,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:54:25,457 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 17:54:25,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 17:54:25,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:25,458 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:25,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:54:25,459 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:25,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:25,459 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 17:54:25,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:25,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294968501] [2020-08-18 17:54:25,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:25,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:25,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 17:54:25,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:25,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294968501] [2020-08-18 17:54:25,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:25,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:54:25,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89183987] [2020-08-18 17:54:25,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:54:25,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:25,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:54:25,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:54:25,579 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 17:54:25,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:25,674 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 17:54:25,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:54:25,675 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 17:54:25,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:25,676 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:54:25,676 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 17:54:25,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:54:25,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 17:54:25,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 17:54:25,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 17:54:25,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 17:54:25,683 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 17:54:25,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:25,684 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 17:54:25,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:54:25,684 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 17:54:25,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 17:54:25,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:25,685 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:25,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:54:25,686 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:25,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:25,686 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 17:54:25,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:25,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638406745] [2020-08-18 17:54:25,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:25,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:25,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 17:54:25,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,803 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:25,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638406745] [2020-08-18 17:54:25,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:25,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:54:25,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054543724] [2020-08-18 17:54:25,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:54:25,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:25,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:54:25,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:54:25,805 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 17:54:25,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:25,879 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 17:54:25,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:54:25,879 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 17:54:25,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:25,880 INFO L225 Difference]: With dead ends: 40 [2020-08-18 17:54:25,880 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 17:54:25,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:54:25,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 17:54:25,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 17:54:25,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 17:54:25,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 17:54:25,887 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 17:54:25,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:25,888 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 17:54:25,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:54:25,888 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 17:54:25,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 17:54:25,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:25,889 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:25,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:54:25,890 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:25,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:25,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 17:54:25,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:25,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477754153] [2020-08-18 17:54:25,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:25,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:25,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:25,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 17:54:25,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,003 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:26,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477754153] [2020-08-18 17:54:26,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:26,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:54:26,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629130568] [2020-08-18 17:54:26,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:54:26,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:26,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:54:26,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:54:26,006 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 17:54:26,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:26,082 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 17:54:26,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:54:26,082 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 17:54:26,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:26,083 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:54:26,083 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 17:54:26,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:54:26,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 17:54:26,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 17:54:26,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 17:54:26,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 17:54:26,090 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 17:54:26,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:26,090 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 17:54:26,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:54:26,091 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 17:54:26,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:54:26,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:26,092 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:26,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:54:26,092 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:26,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:26,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 17:54:26,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:26,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939168119] [2020-08-18 17:54:26,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:26,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:26,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 17:54:26,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,229 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:26,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939168119] [2020-08-18 17:54:26,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:26,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:54:26,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047231523] [2020-08-18 17:54:26,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:54:26,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:26,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:54:26,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:54:26,235 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 17:54:26,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:26,341 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 17:54:26,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:54:26,342 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 17:54:26,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:26,343 INFO L225 Difference]: With dead ends: 44 [2020-08-18 17:54:26,343 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 17:54:26,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:54:26,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 17:54:26,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 17:54:26,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 17:54:26,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 17:54:26,355 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 17:54:26,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:26,356 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 17:54:26,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:54:26,357 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 17:54:26,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 17:54:26,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:26,361 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:26,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:54:26,361 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:26,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:26,362 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 17:54:26,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:26,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256804467] [2020-08-18 17:54:26,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:26,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:26,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:54:26,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,526 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:26,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256804467] [2020-08-18 17:54:26,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:26,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:54:26,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336268041] [2020-08-18 17:54:26,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:54:26,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:26,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:54:26,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:54:26,529 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 17:54:26,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:26,622 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 17:54:26,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:54:26,623 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 17:54:26,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:26,624 INFO L225 Difference]: With dead ends: 46 [2020-08-18 17:54:26,624 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 17:54:26,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:54:26,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 17:54:26,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 17:54:26,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:54:26,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 17:54:26,631 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 17:54:26,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:26,631 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 17:54:26,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:54:26,632 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 17:54:26,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:54:26,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:26,633 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:26,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:54:26,633 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:26,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:26,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 17:54:26,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:26,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67761231] [2020-08-18 17:54:26,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:26,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:26,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 17:54:26,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:26,776 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:26,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67761231] [2020-08-18 17:54:26,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:26,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:54:26,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145359353] [2020-08-18 17:54:26,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:54:26,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:26,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:54:26,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:54:26,788 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 17:54:26,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:26,922 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 17:54:26,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:54:26,923 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 17:54:26,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:26,924 INFO L225 Difference]: With dead ends: 48 [2020-08-18 17:54:26,924 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:54:26,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:54:26,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:54:26,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 17:54:26,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 17:54:26,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 17:54:26,931 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 17:54:26,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:26,931 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 17:54:26,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:54:26,931 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 17:54:26,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 17:54:26,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:26,932 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:26,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:54:26,933 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:26,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:26,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 17:54:26,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:26,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672089679] [2020-08-18 17:54:26,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:26,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:27,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 17:54:27,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,069 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:27,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672089679] [2020-08-18 17:54:27,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:27,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:54:27,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022538951] [2020-08-18 17:54:27,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:54:27,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:27,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:54:27,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:54:27,072 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 17:54:27,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:27,165 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 17:54:27,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:54:27,166 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 17:54:27,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:27,167 INFO L225 Difference]: With dead ends: 50 [2020-08-18 17:54:27,167 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 17:54:27,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:54:27,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 17:54:27,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 17:54:27,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:54:27,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 17:54:27,173 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 17:54:27,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:27,173 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 17:54:27,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:54:27,173 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 17:54:27,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:54:27,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:27,174 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:27,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:54:27,175 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:27,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:27,175 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 17:54:27,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:27,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359896925] [2020-08-18 17:54:27,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:27,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:54:27,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 17:54:27,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:27,316 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:54:27,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359896925] [2020-08-18 17:54:27,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:54:27,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:54:27,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414293871] [2020-08-18 17:54:27,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:54:27,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:54:27,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:54:27,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:54:27,319 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 17:54:27,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:54:27,413 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 17:54:27,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:54:27,414 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 17:54:27,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:54:27,415 INFO L225 Difference]: With dead ends: 51 [2020-08-18 17:54:27,415 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 17:54:27,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:54:27,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 17:54:27,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 17:54:27,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:54:27,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 17:54:27,421 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 17:54:27,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:54:27,421 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 17:54:27,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:54:27,421 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 17:54:27,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 17:54:27,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:54:27,423 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:54:27,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:54:27,423 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:54:27,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:54:27,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 17:54:27,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:54:27,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864461360] [2020-08-18 17:54:27,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:54:27,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:54:37,441 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 17:54:38,508 WARN L193 SmtUtils]: Spent 850.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 17:54:42,629 WARN L193 SmtUtils]: Spent 3.76 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 17:55:10,894 WARN L193 SmtUtils]: Spent 27.43 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 17:55:11,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:55:11,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:55:11,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 17:55:11,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:55:11,291 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:55:11,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864461360] [2020-08-18 17:55:11,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:55:11,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 17:55:11,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054369869] [2020-08-18 17:55:11,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 17:55:11,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:55:11,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 17:55:11,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:55:11,294 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 17:55:11,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:55:11,773 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 17:55:11,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:55:11,773 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 17:55:11,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:55:11,774 INFO L225 Difference]: With dead ends: 49 [2020-08-18 17:55:11,774 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 17:55:11,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:55:11,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 17:55:11,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 17:55:11,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 17:55:11,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 17:55:11,784 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 17:55:11,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:55:11,785 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 17:55:11,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 17:55:11,785 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 17:55:11,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:55:11,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:55:11,788 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:55:11,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:55:11,789 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:55:11,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:55:11,789 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 17:55:11,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:55:11,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317486287] [2020-08-18 17:55:11,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:55:11,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:55:16,353 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 17:55:17,356 WARN L193 SmtUtils]: Spent 803.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 17:55:21,599 WARN L193 SmtUtils]: Spent 3.78 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 17:55:22,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:55:22,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:55:22,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 17:55:22,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:55:22,195 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:55:22,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317486287] [2020-08-18 17:55:22,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:55:22,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 17:55:22,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692493096] [2020-08-18 17:55:22,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 17:55:22,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:55:22,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 17:55:22,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:55:22,198 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 17:55:23,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:55:23,172 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 17:55:23,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:55:23,173 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 17:55:23,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:55:23,175 INFO L225 Difference]: With dead ends: 48 [2020-08-18 17:55:23,176 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 17:55:23,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 17:55:23,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 17:55:23,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 17:55:23,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 17:55:23,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 17:55:23,191 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 17:55:23,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:55:23,191 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 17:55:23,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 17:55:23,194 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 17:55:23,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 17:55:23,196 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:55:23,196 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:55:23,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:55:23,197 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:55:23,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:55:23,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 17:55:23,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:55:23,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842433332] [2020-08-18 17:55:23,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:55:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat