/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.6.ufo.BOUNDED-12.pals.c.v+sep-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-28 18:43:19,179 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-28 18:43:19,182 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-28 18:43:19,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-28 18:43:19,218 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-28 18:43:19,219 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-28 18:43:19,221 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-28 18:43:19,224 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-28 18:43:19,226 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-28 18:43:19,227 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-28 18:43:19,228 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-28 18:43:19,230 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-28 18:43:19,230 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-28 18:43:19,232 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-28 18:43:19,233 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-28 18:43:19,235 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-28 18:43:19,236 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-28 18:43:19,237 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-28 18:43:19,239 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-28 18:43:19,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-28 18:43:19,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-28 18:43:19,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-28 18:43:19,246 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-28 18:43:19,247 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-28 18:43:19,265 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-28 18:43:19,266 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-28 18:43:19,266 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-28 18:43:19,267 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-28 18:43:19,268 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-28 18:43:19,269 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-28 18:43:19,270 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-28 18:43:19,271 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-28 18:43:19,272 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-28 18:43:19,273 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-28 18:43:19,274 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-28 18:43:19,274 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-28 18:43:19,275 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-28 18:43:19,276 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-28 18:43:19,276 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-28 18:43:19,278 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-28 18:43:19,278 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-28 18:43:19,280 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-28 18:43:19,308 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-28 18:43:19,309 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-28 18:43:19,310 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-28 18:43:19,311 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-28 18:43:19,311 INFO L138 SettingsManager]: * Use SBE=true [2020-10-28 18:43:19,311 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-28 18:43:19,312 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-28 18:43:19,312 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-28 18:43:19,312 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-28 18:43:19,312 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-28 18:43:19,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-28 18:43:19,313 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-28 18:43:19,313 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-28 18:43:19,313 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-28 18:43:19,313 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-28 18:43:19,314 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-28 18:43:19,314 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-28 18:43:19,314 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-28 18:43:19,314 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-28 18:43:19,314 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-28 18:43:19,315 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-28 18:43:19,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-28 18:43:19,315 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-28 18:43:19,315 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-28 18:43:19,316 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-28 18:43:19,316 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-28 18:43:19,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-28 18:43:19,316 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-28 18:43:19,316 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-28 18:43:19,317 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true;unknown-allowed=true; [2020-10-28 18:43:19,761 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-28 18:43:19,811 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-28 18:43:19,814 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-28 18:43:19,816 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-28 18:43:19,817 INFO L275 PluginConnector]: CDTParser initialized [2020-10-28 18:43:19,818 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.6.ufo.BOUNDED-12.pals.c.v+sep-reducer.c [2020-10-28 18:43:19,906 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7f6114aa8/3d5462022f764a42b1e85cd3d8c2945c/FLAG42b694ece [2020-10-28 18:43:20,967 INFO L306 CDTParser]: Found 1 translation units. [2020-10-28 18:43:20,968 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_lcr.6.ufo.BOUNDED-12.pals.c.v+sep-reducer.c [2020-10-28 18:43:21,025 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7f6114aa8/3d5462022f764a42b1e85cd3d8c2945c/FLAG42b694ece [2020-10-28 18:43:21,401 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7f6114aa8/3d5462022f764a42b1e85cd3d8c2945c [2020-10-28 18:43:21,406 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-28 18:43:21,416 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-28 18:43:21,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-28 18:43:21,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-28 18:43:21,422 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-28 18:43:21,423 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 06:43:21" (1/1) ... [2020-10-28 18:43:21,427 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@487679c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:21, skipping insertion in model container [2020-10-28 18:43:21,427 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 06:43:21" (1/1) ... [2020-10-28 18:43:21,436 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-28 18:43:21,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-28 18:43:23,700 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 18:43:23,748 INFO L203 MainTranslator]: Completed pre-run [2020-10-28 18:43:24,645 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 18:43:24,679 INFO L208 MainTranslator]: Completed translation [2020-10-28 18:43:24,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24 WrapperNode [2020-10-28 18:43:24,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-28 18:43:24,681 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-28 18:43:24,681 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-28 18:43:24,681 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-28 18:43:24,697 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,697 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,762 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,954 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:24,990 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (1/1) ... [2020-10-28 18:43:25,039 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-28 18:43:25,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-28 18:43:25,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-28 18:43:25,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-28 18:43:25,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (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 [2020-10-28 18:43:25,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-28 18:43:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-28 18:43:25,130 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-28 18:43:25,131 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-28 18:43:25,131 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-28 18:43:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-28 18:43:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-28 18:43:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-28 18:43:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-28 18:43:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-10-28 18:43:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-28 18:43:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-10-28 18:43:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-28 18:43:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-10-28 18:43:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-10-28 18:43:25,135 INFO L130 BoogieDeclarations]: Found specification of procedure node6 [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-28 18:43:25,136 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-28 18:43:25,137 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-28 18:43:25,137 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-28 18:43:25,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-28 18:43:33,339 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-28 18:43:33,339 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-28 18:43:33,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 06:43:33 BoogieIcfgContainer [2020-10-28 18:43:33,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-28 18:43:33,348 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-28 18:43:33,348 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-28 18:43:33,351 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-28 18:43:33,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 06:43:21" (1/3) ... [2020-10-28 18:43:33,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a64b0d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 06:43:33, skipping insertion in model container [2020-10-28 18:43:33,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 06:43:24" (2/3) ... [2020-10-28 18:43:33,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a64b0d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 06:43:33, skipping insertion in model container [2020-10-28 18:43:33,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 06:43:33" (3/3) ... [2020-10-28 18:43:33,355 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.6.ufo.BOUNDED-12.pals.c.v+sep-reducer.c [2020-10-28 18:43:33,368 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-28 18:43:33,375 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-28 18:43:33,388 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-28 18:43:33,433 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-28 18:43:33,433 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-28 18:43:33,433 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-28 18:43:33,433 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-28 18:43:33,433 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-28 18:43:33,433 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-28 18:43:33,434 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-28 18:43:33,434 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-28 18:43:33,496 INFO L276 IsEmpty]: Start isEmpty. Operand 2550 states. [2020-10-28 18:43:33,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-28 18:43:33,546 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 18:43:33,547 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 18:43:33,547 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 18:43:33,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 18:43:33,557 INFO L82 PathProgramCache]: Analyzing trace with hash -80909251, now seen corresponding path program 1 times [2020-10-28 18:43:33,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 18:43:33,570 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469008794] [2020-10-28 18:43:33,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 18:43:34,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:43:34,518 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:34,904 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:35,393 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:35,638 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:35,835 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:37,016 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:39,332 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:43:39,333 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-28 18:43:39,333 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-28 18:43:39,333 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5022 [2020-10-28 18:43:39,337 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:43:39,337 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:43:39,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 18:43:39,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-28 18:43:39,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 53 [2020-10-28 18:43:39,339 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-28 18:43:47,069 WARN L193 SmtUtils]: Spent 7.28 s on a formula simplification that was a NOOP. DAG size: 1084 [2020-10-28 18:43:47,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 18:43:47,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:43:47,165 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:43:47,304 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:43:47,304 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 18:43:47,304 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 18:43:47,304 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 170 [2020-10-28 18:43:47,305 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:43:47,305 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:43:47,305 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 18:43:47,305 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 18:43:47,305 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-28 18:43:47,306 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:43:47,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 18:43:47,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469008794] [2020-10-28 18:43:47,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 18:43:47,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-28 18:43:47,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725083855] [2020-10-28 18:43:47,452 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 18:43:47,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 18:43:47,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 18:43:47,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-28 18:43:47,477 INFO L87 Difference]: Start difference. First operand 2550 states. Second operand 6 states. [2020-10-28 18:43:54,710 WARN L193 SmtUtils]: Spent 7.02 s on a formula simplification that was a NOOP. DAG size: 1092 [2020-10-28 18:44:31,504 WARN L193 SmtUtils]: Spent 7.03 s on a formula simplification that was a NOOP. DAG size: 1090 [2020-10-28 18:44:32,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 18:44:32,998 INFO L93 Difference]: Finished difference Result 3908 states and 6681 transitions. [2020-10-28 18:44:32,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 18:44:33,000 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 92 [2020-10-28 18:44:33,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 18:44:33,043 INFO L225 Difference]: With dead ends: 3908 [2020-10-28 18:44:33,043 INFO L226 Difference]: Without dead ends: 2624 [2020-10-28 18:44:33,053 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-10-28 18:44:33,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2624 states. [2020-10-28 18:44:33,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2624 to 2538. [2020-10-28 18:44:33,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2538 states. [2020-10-28 18:44:33,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2538 states to 2538 states and 3342 transitions. [2020-10-28 18:44:33,267 INFO L78 Accepts]: Start accepts. Automaton has 2538 states and 3342 transitions. Word has length 92 [2020-10-28 18:44:33,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 18:44:33,267 INFO L481 AbstractCegarLoop]: Abstraction has 2538 states and 3342 transitions. [2020-10-28 18:44:33,267 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 18:44:33,268 INFO L276 IsEmpty]: Start isEmpty. Operand 2538 states and 3342 transitions. [2020-10-28 18:44:33,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-28 18:44:33,277 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 18:44:33,277 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 18:44:33,277 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-28 18:44:33,278 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 18:44:33,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 18:44:33,278 INFO L82 PathProgramCache]: Analyzing trace with hash -665978351, now seen corresponding path program 1 times [2020-10-28 18:44:33,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 18:44:33,279 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842222978] [2020-10-28 18:44:33,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 18:44:33,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:44:33,491 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:33,709 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:33,943 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:34,087 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:34,264 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:34,859 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:36,446 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:36,581 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:38,398 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:44:38,399 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-28 18:44:38,399 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-10-28 18:44:38,399 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5003 [2020-10-28 18:44:38,399 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:44:38,400 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:44:38,400 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 18:44:38,400 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-28 18:44:38,400 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 59 [2020-10-28 18:44:38,400 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:44:45,648 WARN L193 SmtUtils]: Spent 6.87 s on a formula simplification that was a NOOP. DAG size: 1084 [2020-10-28 18:44:45,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 18:44:45,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:44:45,731 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:44:45,876 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:44:45,877 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 18:44:45,877 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 18:44:45,877 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 171 [2020-10-28 18:44:45,877 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:44:45,878 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:44:45,878 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 18:44:45,878 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 18:44:45,878 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-28 18:44:45,878 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 18:44:46,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 18:44:46,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842222978] [2020-10-28 18:44:46,075 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 18:44:46,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-28 18:44:46,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321802957] [2020-10-28 18:44:46,077 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 18:44:46,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 18:44:46,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 18:44:46,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-28 18:44:46,091 INFO L87 Difference]: Start difference. First operand 2538 states and 3342 transitions. Second operand 6 states. [2020-10-28 18:44:53,410 WARN L193 SmtUtils]: Spent 7.13 s on a formula simplification that was a NOOP. DAG size: 1093 [2020-10-28 18:45:15,564 WARN L193 SmtUtils]: Spent 7.24 s on a formula simplification that was a NOOP. DAG size: 1091 [2020-10-28 18:45:17,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 18:45:17,135 INFO L93 Difference]: Finished difference Result 3695 states and 4899 transitions. [2020-10-28 18:45:17,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 18:45:17,136 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 92 [2020-10-28 18:45:17,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 18:45:17,149 INFO L225 Difference]: With dead ends: 3695 [2020-10-28 18:45:17,150 INFO L226 Difference]: Without dead ends: 2449 [2020-10-28 18:45:17,154 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-10-28 18:45:17,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2449 states. [2020-10-28 18:45:17,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2449 to 2339. [2020-10-28 18:45:17,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2339 states. [2020-10-28 18:45:17,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2339 states to 2339 states and 3163 transitions. [2020-10-28 18:45:17,278 INFO L78 Accepts]: Start accepts. Automaton has 2339 states and 3163 transitions. Word has length 92 [2020-10-28 18:45:17,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 18:45:17,279 INFO L481 AbstractCegarLoop]: Abstraction has 2339 states and 3163 transitions. [2020-10-28 18:45:17,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 18:45:17,279 INFO L276 IsEmpty]: Start isEmpty. Operand 2339 states and 3163 transitions. [2020-10-28 18:45:17,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-28 18:45:17,285 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 18:45:17,285 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 18:45:17,286 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-28 18:45:17,286 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 18:45:17,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 18:45:17,287 INFO L82 PathProgramCache]: Analyzing trace with hash -829321085, now seen corresponding path program 1 times [2020-10-28 18:45:17,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 18:45:17,287 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724181886] [2020-10-28 18:45:17,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 18:45:17,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:45:17,489 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:17,727 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:17,938 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:18,077 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:18,281 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:21,224 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:22,449 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:45:22,450 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-28 18:45:22,450 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-28 18:45:22,450 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5048 [2020-10-28 18:45:22,450 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:45:22,451 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:45:22,451 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 18:45:22,451 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-28 18:45:22,451 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 63 [2020-10-28 18:45:22,451 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:45:29,972 WARN L193 SmtUtils]: Spent 7.24 s on a formula simplification that was a NOOP. DAG size: 1084 [2020-10-28 18:45:29,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 18:45:30,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:45:30,046 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:45:30,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:45:30,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 18:45:30,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 18:45:30,150 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 127 [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-28 18:45:30,151 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:45:30,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 18:45:30,247 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724181886] [2020-10-28 18:45:30,248 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 18:45:30,248 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-28 18:45:30,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502367706] [2020-10-28 18:45:30,249 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 18:45:30,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 18:45:30,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 18:45:30,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-28 18:45:30,250 INFO L87 Difference]: Start difference. First operand 2339 states and 3163 transitions. Second operand 6 states. [2020-10-28 18:45:37,896 WARN L193 SmtUtils]: Spent 7.43 s on a formula simplification that was a NOOP. DAG size: 1092 [2020-10-28 18:45:59,613 WARN L193 SmtUtils]: Spent 7.25 s on a formula simplification that was a NOOP. DAG size: 1090 [2020-10-28 18:46:00,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 18:46:00,899 INFO L93 Difference]: Finished difference Result 4096 states and 5564 transitions. [2020-10-28 18:46:00,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 18:46:00,900 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 92 [2020-10-28 18:46:00,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 18:46:00,915 INFO L225 Difference]: With dead ends: 4096 [2020-10-28 18:46:00,915 INFO L226 Difference]: Without dead ends: 2845 [2020-10-28 18:46:00,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-10-28 18:46:00,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2845 states. [2020-10-28 18:46:01,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2845 to 2772. [2020-10-28 18:46:01,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2772 states. [2020-10-28 18:46:01,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2772 states to 2772 states and 3758 transitions. [2020-10-28 18:46:01,071 INFO L78 Accepts]: Start accepts. Automaton has 2772 states and 3758 transitions. Word has length 92 [2020-10-28 18:46:01,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 18:46:01,072 INFO L481 AbstractCegarLoop]: Abstraction has 2772 states and 3758 transitions. [2020-10-28 18:46:01,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 18:46:01,072 INFO L276 IsEmpty]: Start isEmpty. Operand 2772 states and 3758 transitions. [2020-10-28 18:46:01,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-10-28 18:46:01,077 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 18:46:01,077 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 18:46:01,078 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-28 18:46:01,078 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 18:46:01,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 18:46:01,079 INFO L82 PathProgramCache]: Analyzing trace with hash -776630561, now seen corresponding path program 1 times [2020-10-28 18:46:01,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 18:46:01,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889169034] [2020-10-28 18:46:01,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 18:46:01,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:46:01,257 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:01,480 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:01,657 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:02,116 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:02,479 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:02,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:03,948 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:06,222 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:46:06,223 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-28 18:46:06,223 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-10-28 18:46:06,223 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5043 [2020-10-28 18:46:06,223 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:46:06,224 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:46:06,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-28 18:46:06,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 18:46:06,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 66 [2020-10-28 18:46:06,224 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:46:13,688 WARN L193 SmtUtils]: Spent 7.16 s on a formula simplification that was a NOOP. DAG size: 1084 [2020-10-28 18:46:13,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 18:46:13,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:46:13,730 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:13,781 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:46:13,782 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 18:46:13,782 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 18:46:13,782 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 64 [2020-10-28 18:46:13,782 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:46:13,782 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:46:13,783 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 18:46:13,783 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 18:46:13,783 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 18:46:13,783 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:46:13,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 18:46:13,889 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889169034] [2020-10-28 18:46:13,890 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 18:46:13,890 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-28 18:46:13,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483592211] [2020-10-28 18:46:13,895 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-28 18:46:13,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 18:46:13,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-28 18:46:13,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-28 18:46:13,896 INFO L87 Difference]: Start difference. First operand 2772 states and 3758 transitions. Second operand 7 states. [2020-10-28 18:46:21,400 WARN L193 SmtUtils]: Spent 7.29 s on a formula simplification that was a NOOP. DAG size: 1094 [2020-10-28 18:46:41,176 WARN L193 SmtUtils]: Spent 7.21 s on a formula simplification that was a NOOP. DAG size: 1092 [2020-10-28 18:46:45,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 18:46:45,379 INFO L93 Difference]: Finished difference Result 4742 states and 6693 transitions. [2020-10-28 18:46:45,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-28 18:46:45,380 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 94 [2020-10-28 18:46:45,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 18:46:45,400 INFO L225 Difference]: With dead ends: 4742 [2020-10-28 18:46:45,400 INFO L226 Difference]: Without dead ends: 4105 [2020-10-28 18:46:45,404 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-10-28 18:46:45,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4105 states. [2020-10-28 18:46:45,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4105 to 2772. [2020-10-28 18:46:45,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2772 states. [2020-10-28 18:46:45,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2772 states to 2772 states and 3757 transitions. [2020-10-28 18:46:45,591 INFO L78 Accepts]: Start accepts. Automaton has 2772 states and 3757 transitions. Word has length 94 [2020-10-28 18:46:45,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 18:46:45,591 INFO L481 AbstractCegarLoop]: Abstraction has 2772 states and 3757 transitions. [2020-10-28 18:46:45,591 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-28 18:46:45,591 INFO L276 IsEmpty]: Start isEmpty. Operand 2772 states and 3757 transitions. [2020-10-28 18:46:45,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-10-28 18:46:45,596 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 18:46:45,596 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 18:46:45,597 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-28 18:46:45,597 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 18:46:45,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 18:46:45,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1102996630, now seen corresponding path program 1 times [2020-10-28 18:46:45,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 18:46:45,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009096708] [2020-10-28 18:46:45,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 18:46:45,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:46:45,819 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:46,035 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:46,210 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:46,666 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:47,036 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:47,589 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:47,784 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:49,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:50,753 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:46:50,754 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 18:46:50,755 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 18:46:50,755 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 68 [2020-10-28 18:46:50,755 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:46:58,266 WARN L193 SmtUtils]: Spent 7.22 s on a formula simplification that was a NOOP. DAG size: 1084 [2020-10-28 18:46:58,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 18:46:58,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 18:46:58,296 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 18:46:58,327 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 18:46:58,327 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 18:46:58,327 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 37 [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 18:46:58,328 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 18:46:58,329 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 18:46:58,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 18:46:58,409 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009096708] [2020-10-28 18:46:58,409 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 18:46:58,409 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-28 18:46:58,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226661616] [2020-10-28 18:46:58,410 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-28 18:46:58,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 18:46:58,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-28 18:46:58,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-28 18:46:58,411 INFO L87 Difference]: Start difference. First operand 2772 states and 3757 transitions. Second operand 8 states.