/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=DEEPEST --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/eca-rers2012/Problem19_label22.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 19:23:42,428 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 19:23:42,431 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 19:23:42,488 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 19:23:42,489 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 19:23:42,496 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 19:23:42,498 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 19:23:42,503 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 19:23:42,507 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 19:23:42,513 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 19:23:42,515 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 19:23:42,516 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 19:23:42,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 19:23:42,520 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 19:23:42,524 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 19:23:42,526 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 19:23:42,528 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 19:23:42,531 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 19:23:42,539 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 19:23:42,547 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 19:23:42,551 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 19:23:42,553 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 19:23:42,556 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 19:23:42,558 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 19:23:42,569 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 19:23:42,570 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 19:23:42,573 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 19:23:42,575 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 19:23:42,575 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 19:23:42,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 19:23:42,579 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 19:23:42,580 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 19:23:42,580 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 19:23:42,581 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 19:23:42,582 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 19:23:42,583 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 19:23:42,584 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 19:23:42,584 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 19:23:42,584 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 19:23:42,585 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 19:23:42,586 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 19:23:42,587 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 [2020-10-27 19:23:42,618 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 19:23:42,618 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 19:23:42,620 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 19:23:42,620 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 19:23:42,621 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 19:23:42,621 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 19:23:42,621 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 19:23:42,621 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 19:23:42,622 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 19:23:42,622 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 19:23:42,622 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 19:23:42,622 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 19:23:42,622 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 19:23:42,623 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 19:23:42,623 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 19:23:42,623 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 19:23:42,623 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 19:23:42,623 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 19:23:42,624 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 19:23:42,624 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 19:23:42,624 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 19:23:42,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 19:23:42,625 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 19:23:42,625 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 19:23:42,625 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 19:23:42,625 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 19:23:42,625 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 19:23:42,626 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 19:23:42,626 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 19:23:42,626 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 19:23:43,029 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 19:23:43,090 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 19:23:43,094 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 19:23:43,096 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 19:23:43,097 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 19:23:43,099 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label22.c [2020-10-27 19:23:43,208 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/47f3de21a/cfc881f25ab04d15b223397d67b3b401/FLAG039ccd9a0 [2020-10-27 19:23:44,694 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 19:23:44,695 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label22.c [2020-10-27 19:23:44,773 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/47f3de21a/cfc881f25ab04d15b223397d67b3b401/FLAG039ccd9a0 [2020-10-27 19:23:45,293 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/47f3de21a/cfc881f25ab04d15b223397d67b3b401 [2020-10-27 19:23:45,296 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 19:23:45,302 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 19:23:45,304 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 19:23:45,304 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 19:23:45,327 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 19:23:45,328 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:23:45" (1/1) ... [2020-10-27 19:23:45,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62a72641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:45, skipping insertion in model container [2020-10-27 19:23:45,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 07:23:45" (1/1) ... [2020-10-27 19:23:45,342 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 19:23:45,529 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 19:23:47,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:23:47,809 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 19:23:48,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 19:23:48,936 INFO L208 MainTranslator]: Completed translation [2020-10-27 19:23:48,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48 WrapperNode [2020-10-27 19:23:48,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 19:23:48,938 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 19:23:48,938 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 19:23:48,939 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 19:23:48,953 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:48,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,116 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,401 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,545 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (1/1) ... [2020-10-27 19:23:49,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 19:23:49,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 19:23:49,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 19:23:49,614 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 19:23:49,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (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 [2020-10-27 19:23:49,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 19:23:49,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 19:23:49,713 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 19:23:49,714 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-27 19:23:49,714 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-27 19:23:49,714 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-27 19:23:49,714 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-27 19:23:49,715 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-27 19:23:49,715 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-27 19:23:49,715 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 19:23:49,716 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-27 19:23:49,716 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-27 19:23:49,716 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-27 19:23:49,717 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-27 19:23:49,717 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-27 19:23:49,718 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-27 19:23:49,718 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 19:23:49,718 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 19:23:49,718 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 19:23:49,719 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 19:23:49,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 19:23:49,720 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 19:23:49,720 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 19:23:49,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 19:24:04,334 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 19:24:04,335 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-27 19:24:04,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:24:04 BoogieIcfgContainer [2020-10-27 19:24:04,341 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 19:24:04,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 19:24:04,343 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 19:24:04,347 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 19:24:04,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 07:23:45" (1/3) ... [2020-10-27 19:24:04,349 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b968cc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:24:04, skipping insertion in model container [2020-10-27 19:24:04,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 07:23:48" (2/3) ... [2020-10-27 19:24:04,350 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b968cc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 07:24:04, skipping insertion in model container [2020-10-27 19:24:04,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 07:24:04" (3/3) ... [2020-10-27 19:24:04,352 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem19_label22.c [2020-10-27 19:24:04,365 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 19:24:04,382 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 19:24:04,399 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 19:24:04,449 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 19:24:04,450 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 19:24:04,450 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 19:24:04,450 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 19:24:04,450 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 19:24:04,450 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 19:24:04,450 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 19:24:04,450 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 19:24:04,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states. [2020-10-27 19:24:04,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-27 19:24:04,521 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:24:04,522 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] [2020-10-27 19:24:04,523 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:24:04,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:24:04,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1209651973, now seen corresponding path program 1 times [2020-10-27 19:24:04,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:24:04,539 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373203713] [2020-10-27 19:24:04,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:24:04,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:04,813 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:05,392 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:05,393 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 46 [2020-10-27 19:24:05,393 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:05,393 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 636 [2020-10-27 19:24:05,395 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:05,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 19:24:05,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-27 19:24:05,397 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 37 [2020-10-27 19:24:05,397 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-27 19:24:05,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:24:05,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:05,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:05,834 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:05,834 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:24:05,834 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:05,835 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 53 [2020-10-27 19:24:05,835 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:05,835 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:24:05,835 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:24:05,835 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-27 19:24:05,836 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:24:05,870 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:24:05,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373203713] [2020-10-27 19:24:05,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 19:24:05,874 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 19:24:05,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615208540] [2020-10-27 19:24:05,881 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-27 19:24:05,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:24:05,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-27 19:24:05,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-27 19:24:05,907 INFO L87 Difference]: Start difference. First operand 1781 states. Second operand 4 states. [2020-10-27 19:24:33,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:24:33,463 INFO L93 Difference]: Finished difference Result 5100 states and 9572 transitions. [2020-10-27 19:24:33,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:24:33,469 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 36 [2020-10-27 19:24:33,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:24:33,534 INFO L225 Difference]: With dead ends: 5100 [2020-10-27 19:24:33,534 INFO L226 Difference]: Without dead ends: 3255 [2020-10-27 19:24:33,555 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:24:33,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2020-10-27 19:24:33,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 3209. [2020-10-27 19:24:33,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3209 states. [2020-10-27 19:24:33,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3209 states to 3209 states and 5178 transitions. [2020-10-27 19:24:33,908 INFO L78 Accepts]: Start accepts. Automaton has 3209 states and 5178 transitions. Word has length 36 [2020-10-27 19:24:33,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:24:33,909 INFO L481 AbstractCegarLoop]: Abstraction has 3209 states and 5178 transitions. [2020-10-27 19:24:33,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-27 19:24:33,910 INFO L276 IsEmpty]: Start isEmpty. Operand 3209 states and 5178 transitions. [2020-10-27 19:24:33,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-10-27 19:24:33,915 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:24:33,916 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:24:33,916 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 19:24:33,917 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:24:33,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:24:33,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1200286052, now seen corresponding path program 1 times [2020-10-27 19:24:33,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:24:33,918 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143575218] [2020-10-27 19:24:33,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:24:33,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:34,014 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:34,427 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:34,771 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:35,530 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:35,530 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 123 [2020-10-27 19:24:35,531 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:24:35,531 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1551 [2020-10-27 19:24:35,532 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:35,532 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:24:35,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 85 [2020-10-27 19:24:35,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-27 19:24:35,533 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-27 19:24:35,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:24:35,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:35,687 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:35,699 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:35,699 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:24:35,700 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:35,700 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-10-27 19:24:35,705 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:35,705 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:24:35,705 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:24:35,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:24:35,706 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:24:35,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:24:35,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:24:35,782 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:24:35,869 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:24:35,869 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-27 19:24:35,869 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:24:35,870 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 102 [2020-10-27 19:24:35,870 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:24:35,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:24:35,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:24:35,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 70 [2020-10-27 19:24:35,871 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:24:35,935 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:24:35,935 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143575218] [2020-10-27 19:24:35,936 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:24:35,936 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:24:35,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154062761] [2020-10-27 19:24:35,938 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:24:35,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:24:35,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:24:35,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:24:35,940 INFO L87 Difference]: Start difference. First operand 3209 states and 5178 transitions. Second operand 5 states. [2020-10-27 19:25:11,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:25:11,905 INFO L93 Difference]: Finished difference Result 7914 states and 13256 transitions. [2020-10-27 19:25:11,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:25:11,908 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 111 [2020-10-27 19:25:11,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:25:11,941 INFO L225 Difference]: With dead ends: 7914 [2020-10-27 19:25:11,942 INFO L226 Difference]: Without dead ends: 4711 [2020-10-27 19:25:11,954 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:25:11,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4711 states. [2020-10-27 19:25:12,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4711 to 4665. [2020-10-27 19:25:12,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4665 states. [2020-10-27 19:25:12,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4665 states to 4665 states and 7160 transitions. [2020-10-27 19:25:12,134 INFO L78 Accepts]: Start accepts. Automaton has 4665 states and 7160 transitions. Word has length 111 [2020-10-27 19:25:12,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:25:12,135 INFO L481 AbstractCegarLoop]: Abstraction has 4665 states and 7160 transitions. [2020-10-27 19:25:12,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:25:12,135 INFO L276 IsEmpty]: Start isEmpty. Operand 4665 states and 7160 transitions. [2020-10-27 19:25:12,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-10-27 19:25:12,138 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:25:12,139 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:25:12,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 19:25:12,139 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:25:12,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:25:12,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1575896893, now seen corresponding path program 1 times [2020-10-27 19:25:12,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:25:12,141 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128813274] [2020-10-27 19:25:12,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:25:12,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:12,211 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:12,479 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:13,413 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:13,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 124 [2020-10-27 19:25:13,414 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 19:25:13,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1229 [2020-10-27 19:25:13,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:13,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:25:13,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 86 [2020-10-27 19:25:13,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-27 19:25:13,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:25:13,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:25:13,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:13,597 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:13,609 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:13,610 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:25:13,610 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:25:13,610 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-10-27 19:25:13,611 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:13,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:25:13,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:25:13,612 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:25:13,612 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:25:13,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:25:13,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:25:13,708 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:25:13,793 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:25:13,794 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-27 19:25:13,794 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:25:13,794 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 105 [2020-10-27 19:25:13,794 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:25:13,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:25:13,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:25:13,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 71 [2020-10-27 19:25:13,795 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:25:13,890 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:25:13,893 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128813274] [2020-10-27 19:25:13,894 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:25:13,894 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:25:13,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898350642] [2020-10-27 19:25:13,897 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:25:13,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:25:13,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:25:13,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:25:13,900 INFO L87 Difference]: Start difference. First operand 4665 states and 7160 transitions. Second operand 5 states. [2020-10-27 19:26:03,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:26:03,603 INFO L93 Difference]: Finished difference Result 13564 states and 21070 transitions. [2020-10-27 19:26:03,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:26:03,611 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 112 [2020-10-27 19:26:03,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:26:03,678 INFO L225 Difference]: With dead ends: 13564 [2020-10-27 19:26:03,679 INFO L226 Difference]: Without dead ends: 8905 [2020-10-27 19:26:03,699 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:26:03,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8905 states. [2020-10-27 19:26:04,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8905 to 8899. [2020-10-27 19:26:04,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8899 states. [2020-10-27 19:26:04,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8899 states to 8899 states and 12085 transitions. [2020-10-27 19:26:04,045 INFO L78 Accepts]: Start accepts. Automaton has 8899 states and 12085 transitions. Word has length 112 [2020-10-27 19:26:04,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:26:04,045 INFO L481 AbstractCegarLoop]: Abstraction has 8899 states and 12085 transitions. [2020-10-27 19:26:04,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:26:04,048 INFO L276 IsEmpty]: Start isEmpty. Operand 8899 states and 12085 transitions. [2020-10-27 19:26:04,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-10-27 19:26:04,068 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:26:04,069 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:26:04,070 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 19:26:04,070 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:26:04,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:26:04,071 INFO L82 PathProgramCache]: Analyzing trace with hash 2033071834, now seen corresponding path program 1 times [2020-10-27 19:26:04,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:26:04,072 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375936150] [2020-10-27 19:26:04,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:26:04,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:04,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:04,407 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:05,611 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:06,943 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:06,944 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 149 [2020-10-27 19:26:06,947 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:26:06,947 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2779 [2020-10-27 19:26:06,947 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:06,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:26:06,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 111 [2020-10-27 19:26:06,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-27 19:26:06,948 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:26:07,236 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2020-10-27 19:26:07,382 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:26:07,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:26:07,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:07,395 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:07,402 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:07,403 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:26:07,403 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:07,403 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 19:26:07,403 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:07,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:26:07,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:07,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:26:07,405 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 19:26:07,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:26:07,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:07,546 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:07,733 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:07,733 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-27 19:26:07,734 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:07,734 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 223 [2020-10-27 19:26:07,734 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:07,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:26:07,734 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:07,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 96 [2020-10-27 19:26:07,735 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:07,866 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:26:07,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375936150] [2020-10-27 19:26:07,867 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:26:07,867 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:26:07,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522908849] [2020-10-27 19:26:07,878 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:26:07,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:26:07,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:26:07,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:26:07,890 INFO L87 Difference]: Start difference. First operand 8899 states and 12085 transitions. Second operand 5 states. [2020-10-27 19:26:09,289 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-10-27 19:26:53,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 19:26:53,616 INFO L93 Difference]: Finished difference Result 17814 states and 24206 transitions. [2020-10-27 19:26:53,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-27 19:26:53,626 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 137 [2020-10-27 19:26:53,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 19:26:53,686 INFO L225 Difference]: With dead ends: 17814 [2020-10-27 19:26:53,686 INFO L226 Difference]: Without dead ends: 8903 [2020-10-27 19:26:53,713 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-27 19:26:53,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8903 states. [2020-10-27 19:26:53,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8903 to 8899. [2020-10-27 19:26:53,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8899 states. [2020-10-27 19:26:53,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8899 states to 8899 states and 12081 transitions. [2020-10-27 19:26:53,951 INFO L78 Accepts]: Start accepts. Automaton has 8899 states and 12081 transitions. Word has length 137 [2020-10-27 19:26:53,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 19:26:53,952 INFO L481 AbstractCegarLoop]: Abstraction has 8899 states and 12081 transitions. [2020-10-27 19:26:53,952 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-27 19:26:53,952 INFO L276 IsEmpty]: Start isEmpty. Operand 8899 states and 12081 transitions. [2020-10-27 19:26:53,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-10-27 19:26:53,954 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 19:26:53,954 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 19:26:53,954 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 19:26:53,955 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 19:26:53,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 19:26:53,955 INFO L82 PathProgramCache]: Analyzing trace with hash 2094907457, now seen corresponding path program 1 times [2020-10-27 19:26:53,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 19:26:53,956 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867776060] [2020-10-27 19:26:53,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 19:26:53,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:54,092 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:54,416 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:54,645 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:55,802 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:55,803 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 150 [2020-10-27 19:26:55,803 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 19:26:55,803 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1808 [2020-10-27 19:26:55,803 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:55,804 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 19:26:55,804 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 112 [2020-10-27 19:26:55,804 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-27 19:26:55,804 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:55,976 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-10-27 19:26:55,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 19:26:55,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:55,982 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:55,988 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:55,988 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 19:26:55,988 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:55,988 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-27 19:26:55,989 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:55,989 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 19:26:55,989 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:55,989 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 19:26:55,989 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:56,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-27 19:26:56,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 19:26:56,074 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 19:26:56,199 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 19:26:56,200 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 103 [2020-10-27 19:26:56,200 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 19:26:56,200 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 141 [2020-10-27 19:26:56,200 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 19:26:56,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 19:26:56,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 19:26:56,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 97 [2020-10-27 19:26:56,201 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 19:26:56,260 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 19:26:56,261 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867776060] [2020-10-27 19:26:56,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 19:26:56,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-27 19:26:56,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669873446] [2020-10-27 19:26:56,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-27 19:26:56,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 19:26:56,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-27 19:26:56,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-27 19:26:56,264 INFO L87 Difference]: Start difference. First operand 8899 states and 12081 transitions. Second operand 5 states. [2020-10-27 19:26:57,376 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 66