/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/vogal-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:20:47,308 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:20:47,310 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:20:47,345 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 11:20:47,346 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 11:20:47,349 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 11:20:47,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 11:20:47,356 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 11:20:47,358 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 11:20:47,362 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 11:20:47,363 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 11:20:47,364 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 11:20:47,364 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:20:47,366 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:20:47,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:20:47,368 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:20:47,371 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:20:47,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:20:47,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:20:47,377 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:20:47,378 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:20:47,380 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:20:47,380 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:20:47,382 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:20:47,384 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 11:20:47,384 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 11:20:47,384 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 11:20:47,385 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 11:20:47,385 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 11:20:47,386 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 11:20:47,386 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 11:20:47,387 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 11:20:47,387 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 11:20:47,388 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 11:20:47,389 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 11:20:47,389 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 11:20:47,389 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 11:20:47,390 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 11:20:47,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:20:47,390 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:20:47,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:20:47,391 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:20:47,401 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:20:47,402 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:20:47,404 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:20:47,404 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:20:47,404 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:20:47,404 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:20:47,404 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:20:47,405 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:20:47,405 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:20:47,405 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:20:47,405 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:20:47,406 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:20:47,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:20:47,407 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:20:47,407 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:20:47,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:20:47,407 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:20:47,407 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:20:47,708 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:20:47,723 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:20:47,725 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:20:47,726 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:20:47,726 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:20:47,727 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-1.i [2021-05-06 11:20:47,763 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc3ce554f/1ef88e72f14242f9a5052bda94825c22/FLAG96a5a58b2 [2021-05-06 11:20:48,298 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:20:48,299 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-1.i [2021-05-06 11:20:48,305 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc3ce554f/1ef88e72f14242f9a5052bda94825c22/FLAG96a5a58b2 [2021-05-06 11:20:48,765 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc3ce554f/1ef88e72f14242f9a5052bda94825c22 [2021-05-06 11:20:48,767 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:20:48,768 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:20:48,772 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:20:48,772 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:20:48,777 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:20:48,777 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:20:48" (1/1) ... [2021-05-06 11:20:48,778 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@388a0ed6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:48, skipping insertion in model container [2021-05-06 11:20:48,778 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:20:48" (1/1) ... [2021-05-06 11:20:48,782 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:20:48,791 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:20:48,916 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-1.i[895,908] [2021-05-06 11:20:48,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:20:48,935 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:20:48,943 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-1.i[895,908] [2021-05-06 11:20:48,950 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:20:49,004 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:20:49,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49 WrapperNode [2021-05-06 11:20:49,021 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:20:49,022 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:20:49,022 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:20:49,023 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:20:49,031 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,031 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,060 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,060 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,070 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,084 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... [2021-05-06 11:20:49,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:20:49,086 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:20:49,086 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:20:49,086 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:20:49,087 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2021-05-06 11:20:49,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:20:49,205 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:20:49,206 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:20:49,206 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 11:20:49,206 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:20:49,206 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:20:49,206 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:20:49,206 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:20:49,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-06 11:20:49,208 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:20:49,208 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:20:49,208 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:20:49,208 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:20:49,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:20:49,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:20:49,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:20:49,583 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:20:49,583 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-05-06 11:20:49,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:20:49 BoogieIcfgContainer [2021-05-06 11:20:49,584 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:20:49,585 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:20:49,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:20:49,587 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:20:49,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:20:48" (1/3) ... [2021-05-06 11:20:49,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72eed21d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:20:49, skipping insertion in model container [2021-05-06 11:20:49,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:49" (2/3) ... [2021-05-06 11:20:49,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72eed21d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:20:49, skipping insertion in model container [2021-05-06 11:20:49,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:20:49" (3/3) ... [2021-05-06 11:20:49,589 INFO L111 eAbstractionObserver]: Analyzing ICFG vogal-1.i [2021-05-06 11:20:49,592 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:20:49,594 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:20:49,604 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:20:49,616 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:20:49,616 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:20:49,616 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:20:49,616 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:20:49,616 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:20:49,617 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:20:49,617 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:20:49,617 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:20:49,625 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:20:49,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 11:20:49,630 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:49,630 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:49,630 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:49,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:49,633 INFO L82 PathProgramCache]: Analyzing trace with hash -366742854, now seen corresponding path program 1 times [2021-05-06 11:20:49,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:49,638 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019474431] [2021-05-06 11:20:49,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:49,676 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:49,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:49,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:49,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:49,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:49,847 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:49,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019474431] [2021-05-06 11:20:49,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1019474431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:49,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:49,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:20:49,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133420339] [2021-05-06 11:20:49,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:20:49,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:49,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:20:49,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:20:49,863 INFO L87 Difference]: Start difference. First operand has 37 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 30 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:49,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:49,983 INFO L93 Difference]: Finished difference Result 66 states and 95 transitions. [2021-05-06 11:20:49,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:20:49,998 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-06 11:20:49,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,002 INFO L225 Difference]: With dead ends: 66 [2021-05-06 11:20:50,002 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:20:50,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:20:50,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:20:50,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 11:20:50,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-05-06 11:20:50,036 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 18 [2021-05-06 11:20:50,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,036 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-05-06 11:20:50,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,036 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-05-06 11:20:50,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:20:50,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,037 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:50,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:20:50,038 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,038 INFO L82 PathProgramCache]: Analyzing trace with hash -864138192, now seen corresponding path program 1 times [2021-05-06 11:20:50,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849214000] [2021-05-06 11:20:50,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,050 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:50,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:50,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:50,152 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:50,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849214000] [2021-05-06 11:20:50,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [849214000] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:50,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:50,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:20:50,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983860998] [2021-05-06 11:20:50,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:20:50,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:50,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:20:50,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:50,156 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:50,250 INFO L93 Difference]: Finished difference Result 67 states and 87 transitions. [2021-05-06 11:20:50,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:20:50,250 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:20:50,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,252 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:20:50,253 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:20:50,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:50,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:20:50,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 31. [2021-05-06 11:20:50,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-05-06 11:20:50,266 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 20 [2021-05-06 11:20:50,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,267 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-05-06 11:20:50,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 3 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,267 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-05-06 11:20:50,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 11:20:50,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,269 INFO L523 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] [2021-05-06 11:20:50,270 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:20:50,270 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,270 INFO L82 PathProgramCache]: Analyzing trace with hash 32041234, now seen corresponding path program 1 times [2021-05-06 11:20:50,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219901099] [2021-05-06 11:20:50,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:50,286 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:50,288 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:50,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:50,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:50,411 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:50,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219901099] [2021-05-06 11:20:50,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [219901099] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:50,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:50,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:20:50,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408400421] [2021-05-06 11:20:50,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:20:50,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:50,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:20:50,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:50,412 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:50,529 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2021-05-06 11:20:50,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:20:50,529 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-06 11:20:50,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,530 INFO L225 Difference]: With dead ends: 82 [2021-05-06 11:20:50,530 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 11:20:50,530 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:50,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 11:20:50,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 33. [2021-05-06 11:20:50,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-06 11:20:50,534 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 22 [2021-05-06 11:20:50,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,535 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-06 11:20:50,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,535 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-06 11:20:50,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:20:50,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,535 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:50,535 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:20:50,536 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,536 INFO L82 PathProgramCache]: Analyzing trace with hash -2027956876, now seen corresponding path program 2 times [2021-05-06 11:20:50,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317450027] [2021-05-06 11:20:50,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,540 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:50,540 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:50,541 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:50,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:50,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:50,604 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:50,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317450027] [2021-05-06 11:20:50,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [317450027] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:50,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:50,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:20:50,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049733223] [2021-05-06 11:20:50,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:20:50,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:50,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:20:50,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:20:50,605 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:50,701 INFO L93 Difference]: Finished difference Result 97 states and 129 transitions. [2021-05-06 11:20:50,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:20:50,701 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-06 11:20:50,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,702 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:20:50,703 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 11:20:50,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 29.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:20:50,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 11:20:50,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 35. [2021-05-06 11:20:50,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-05-06 11:20:50,707 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 24 [2021-05-06 11:20:50,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,707 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-05-06 11:20:50,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,707 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-05-06 11:20:50,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:20:50,708 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,708 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:50,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:20:50,708 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1706217130, now seen corresponding path program 3 times [2021-05-06 11:20:50,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412049923] [2021-05-06 11:20:50,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:50,713 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:50,714 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:50,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:50,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:50,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:50,780 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:50,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412049923] [2021-05-06 11:20:50,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1412049923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:50,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:50,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:20:50,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811624721] [2021-05-06 11:20:50,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:20:50,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:50,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:20:50,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:50,782 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:50,929 INFO L93 Difference]: Finished difference Result 112 states and 150 transitions. [2021-05-06 11:20:50,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:20:50,930 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:20:50,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:50,931 INFO L225 Difference]: With dead ends: 112 [2021-05-06 11:20:50,931 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:20:50,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:50,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:20:50,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 37. [2021-05-06 11:20:50,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.25) internal successors, (40), 32 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-06 11:20:50,935 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 26 [2021-05-06 11:20:50,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:50,935 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-06 11:20:50,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:50,936 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-06 11:20:50,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 11:20:50,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:50,936 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:50,936 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:20:50,936 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:50,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:50,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1751966536, now seen corresponding path program 4 times [2021-05-06 11:20:50,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:50,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052303106] [2021-05-06 11:20:50,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:50,941 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:50,941 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:50,942 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:50,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:51,020 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:51,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052303106] [2021-05-06 11:20:51,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1052303106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:51,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:51,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:20:51,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41254982] [2021-05-06 11:20:51,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:20:51,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:51,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:20:51,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:20:51,022 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:51,206 INFO L93 Difference]: Finished difference Result 127 states and 171 transitions. [2021-05-06 11:20:51,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:20:51,206 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-06 11:20:51,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:51,207 INFO L225 Difference]: With dead ends: 127 [2021-05-06 11:20:51,207 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 11:20:51,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 46.3ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:20:51,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 11:20:51,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 39. [2021-05-06 11:20:51,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2021-05-06 11:20:51,211 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 28 [2021-05-06 11:20:51,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:51,211 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2021-05-06 11:20:51,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,212 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2021-05-06 11:20:51,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 11:20:51,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:51,212 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:51,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:20:51,212 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:51,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:51,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1527494554, now seen corresponding path program 5 times [2021-05-06 11:20:51,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:51,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602032081] [2021-05-06 11:20:51,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:51,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:51,217 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:51,217 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:51,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:51,305 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:51,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602032081] [2021-05-06 11:20:51,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1602032081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:51,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:51,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:20:51,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914732276] [2021-05-06 11:20:51,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:20:51,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:51,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:20:51,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:51,306 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:51,404 INFO L93 Difference]: Finished difference Result 63 states and 78 transitions. [2021-05-06 11:20:51,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:20:51,405 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-06 11:20:51,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:51,405 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:20:51,405 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 11:20:51,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 70.1ms TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:20:51,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 11:20:51,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2021-05-06 11:20:51,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.2826086956521738) internal successors, (59), 46 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2021-05-06 11:20:51,409 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 30 [2021-05-06 11:20:51,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:51,409 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2021-05-06 11:20:51,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,409 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2021-05-06 11:20:51,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:20:51,410 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:51,410 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:51,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:20:51,410 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:51,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:51,411 INFO L82 PathProgramCache]: Analyzing trace with hash 810905395, now seen corresponding path program 1 times [2021-05-06 11:20:51,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:51,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582284270] [2021-05-06 11:20:51,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:51,414 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:51,414 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:51,415 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:51,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:51,465 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:51,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582284270] [2021-05-06 11:20:51,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1582284270] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:51,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:51,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:20:51,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299938994] [2021-05-06 11:20:51,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:20:51,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:51,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:20:51,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:51,467 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:51,518 INFO L93 Difference]: Finished difference Result 104 states and 142 transitions. [2021-05-06 11:20:51,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:20:51,518 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-06 11:20:51,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:51,519 INFO L225 Difference]: With dead ends: 104 [2021-05-06 11:20:51,519 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 11:20:51,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 23.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:51,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 11:20:51,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2021-05-06 11:20:51,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.2741935483870968) internal successors, (79), 62 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 83 transitions. [2021-05-06 11:20:51,523 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 83 transitions. Word has length 36 [2021-05-06 11:20:51,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:51,523 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 83 transitions. [2021-05-06 11:20:51,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,524 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 83 transitions. [2021-05-06 11:20:51,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:20:51,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:51,524 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-05-06 11:20:51,524 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:20:51,525 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:51,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:51,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1464313968, now seen corresponding path program 2 times [2021-05-06 11:20:51,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:51,525 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500228475] [2021-05-06 11:20:51,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:51,529 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:51,529 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:51,530 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:51,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:51,577 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:51,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500228475] [2021-05-06 11:20:51,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1500228475] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:51,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:51,577 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:20:51,577 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066418418] [2021-05-06 11:20:51,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:20:51,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:51,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:20:51,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:51,578 INFO L87 Difference]: Start difference. First operand 67 states and 83 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:51,619 INFO L93 Difference]: Finished difference Result 138 states and 177 transitions. [2021-05-06 11:20:51,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:20:51,620 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-06 11:20:51,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:51,620 INFO L225 Difference]: With dead ends: 138 [2021-05-06 11:20:51,620 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:20:51,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:51,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:20:51,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 71. [2021-05-06 11:20:51,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.2727272727272727) internal successors, (84), 66 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2021-05-06 11:20:51,625 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 39 [2021-05-06 11:20:51,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:51,625 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2021-05-06 11:20:51,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:51,625 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2021-05-06 11:20:51,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 11:20:51,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:51,626 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-05-06 11:20:51,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:20:51,626 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:51,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:51,627 INFO L82 PathProgramCache]: Analyzing trace with hash -2131958580, now seen corresponding path program 1 times [2021-05-06 11:20:51,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:51,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945335773] [2021-05-06 11:20:51,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:51,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:51,631 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:51,631 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:51,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:51,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:51,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:51,975 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:51,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945335773] [2021-05-06 11:20:51,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1945335773] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:51,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:51,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:20:51,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091198388] [2021-05-06 11:20:51,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:20:51,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:51,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:20:51,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:51,976 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:52,067 INFO L93 Difference]: Finished difference Result 99 states and 122 transitions. [2021-05-06 11:20:52,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:20:52,068 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-06 11:20:52,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:52,068 INFO L225 Difference]: With dead ends: 99 [2021-05-06 11:20:52,068 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 11:20:52,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 223.2ms TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:20:52,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 11:20:52,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-06 11:20:52,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.265625) internal successors, (81), 64 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2021-05-06 11:20:52,072 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 40 [2021-05-06 11:20:52,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:52,072 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2021-05-06 11:20:52,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,073 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2021-05-06 11:20:52,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:20:52,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:52,073 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-05-06 11:20:52,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:20:52,073 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:52,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:52,074 INFO L82 PathProgramCache]: Analyzing trace with hash 2076492661, now seen corresponding path program 1 times [2021-05-06 11:20:52,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:52,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101638269] [2021-05-06 11:20:52,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:52,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:52,078 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:52,079 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:52,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:52,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:52,250 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:52,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101638269] [2021-05-06 11:20:52,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [101638269] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:52,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:52,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:20:52,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058871685] [2021-05-06 11:20:52,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:20:52,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:52,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:20:52,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:20:52,252 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:52,338 INFO L93 Difference]: Finished difference Result 110 states and 138 transitions. [2021-05-06 11:20:52,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:20:52,339 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 11:20:52,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:52,339 INFO L225 Difference]: With dead ends: 110 [2021-05-06 11:20:52,339 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 11:20:52,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 98.8ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:52,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 11:20:52,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 71. [2021-05-06 11:20:52,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.2575757575757576) internal successors, (83), 66 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 87 transitions. [2021-05-06 11:20:52,344 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 87 transitions. Word has length 41 [2021-05-06 11:20:52,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:52,345 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 87 transitions. [2021-05-06 11:20:52,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,345 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 87 transitions. [2021-05-06 11:20:52,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 11:20:52,345 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:52,345 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-05-06 11:20:52,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:20:52,346 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:52,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:52,346 INFO L82 PathProgramCache]: Analyzing trace with hash -334288281, now seen corresponding path program 1 times [2021-05-06 11:20:52,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:52,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832516685] [2021-05-06 11:20:52,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:52,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:52,350 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:52,350 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:52,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:52,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:52,415 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:52,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832516685] [2021-05-06 11:20:52,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [832516685] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:52,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:52,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:20:52,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353057344] [2021-05-06 11:20:52,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:20:52,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:52,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:20:52,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:52,416 INFO L87 Difference]: Start difference. First operand 71 states and 87 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:52,519 INFO L93 Difference]: Finished difference Result 255 states and 333 transitions. [2021-05-06 11:20:52,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:20:52,519 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-06 11:20:52,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:52,520 INFO L225 Difference]: With dead ends: 255 [2021-05-06 11:20:52,520 INFO L226 Difference]: Without dead ends: 229 [2021-05-06 11:20:52,521 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 47.4ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:20:52,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-05-06 11:20:52,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 77. [2021-05-06 11:20:52,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.2638888888888888) internal successors, (91), 72 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 95 transitions. [2021-05-06 11:20:52,528 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 95 transitions. Word has length 42 [2021-05-06 11:20:52,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:52,528 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 95 transitions. [2021-05-06 11:20:52,528 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,528 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 95 transitions. [2021-05-06 11:20:52,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 11:20:52,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:52,529 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 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] [2021-05-06 11:20:52,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:20:52,529 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:52,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:52,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1673688413, now seen corresponding path program 2 times [2021-05-06 11:20:52,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:52,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342965334] [2021-05-06 11:20:52,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:52,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:52,533 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:52,534 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:52,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:52,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:52,618 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:52,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342965334] [2021-05-06 11:20:52,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1342965334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:52,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:52,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:20:52,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248375040] [2021-05-06 11:20:52,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:20:52,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:52,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:20:52,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:20:52,619 INFO L87 Difference]: Start difference. First operand 77 states and 95 transitions. Second operand has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:52,812 INFO L93 Difference]: Finished difference Result 349 states and 459 transitions. [2021-05-06 11:20:52,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:20:52,813 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-06 11:20:52,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:52,814 INFO L225 Difference]: With dead ends: 349 [2021-05-06 11:20:52,814 INFO L226 Difference]: Without dead ends: 323 [2021-05-06 11:20:52,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 64.4ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:52,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-06 11:20:52,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 81. [2021-05-06 11:20:52,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.2763157894736843) internal successors, (97), 76 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 101 transitions. [2021-05-06 11:20:52,824 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 101 transitions. Word has length 46 [2021-05-06 11:20:52,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:52,824 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 101 transitions. [2021-05-06 11:20:52,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:52,825 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 101 transitions. [2021-05-06 11:20:52,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:20:52,825 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:52,825 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 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] [2021-05-06 11:20:52,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:20:52,826 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:52,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:52,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1941482157, now seen corresponding path program 3 times [2021-05-06 11:20:52,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:52,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757881360] [2021-05-06 11:20:52,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:52,830 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:52,830 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:52,831 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:52,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:52,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:52,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:52,935 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:52,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757881360] [2021-05-06 11:20:52,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [757881360] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:52,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:52,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:20:52,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41172561] [2021-05-06 11:20:52,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:20:52,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:52,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:20:52,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:52,937 INFO L87 Difference]: Start difference. First operand 81 states and 101 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:53,163 INFO L93 Difference]: Finished difference Result 364 states and 478 transitions. [2021-05-06 11:20:53,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:20:53,163 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:20:53,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:53,164 INFO L225 Difference]: With dead ends: 364 [2021-05-06 11:20:53,164 INFO L226 Difference]: Without dead ends: 338 [2021-05-06 11:20:53,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 69.3ms TimeCoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:53,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-05-06 11:20:53,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 83. [2021-05-06 11:20:53,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.2820512820512822) internal successors, (100), 78 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 104 transitions. [2021-05-06 11:20:53,173 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 104 transitions. Word has length 50 [2021-05-06 11:20:53,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:53,173 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 104 transitions. [2021-05-06 11:20:53,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,173 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 104 transitions. [2021-05-06 11:20:53,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:53,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:53,174 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-05-06 11:20:53,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:20:53,174 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:53,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:53,175 INFO L82 PathProgramCache]: Analyzing trace with hash 28908263, now seen corresponding path program 1 times [2021-05-06 11:20:53,175 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:53,175 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892963217] [2021-05-06 11:20:53,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:53,178 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:53,178 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:53,179 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:53,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:53,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:53,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:53,301 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:53,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892963217] [2021-05-06 11:20:53,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [892963217] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:53,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:53,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:20:53,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55964647] [2021-05-06 11:20:53,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:20:53,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:53,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:20:53,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:20:53,302 INFO L87 Difference]: Start difference. First operand 83 states and 104 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:53,558 INFO L93 Difference]: Finished difference Result 199 states and 259 transitions. [2021-05-06 11:20:53,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:20:53,559 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:53,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:53,560 INFO L225 Difference]: With dead ends: 199 [2021-05-06 11:20:53,560 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 11:20:53,560 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 176.7ms TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:20:53,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 11:20:53,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 127. [2021-05-06 11:20:53,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.3114754098360655) internal successors, (160), 122 states have internal predecessors, (160), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 164 transitions. [2021-05-06 11:20:53,575 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 164 transitions. Word has length 51 [2021-05-06 11:20:53,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:53,576 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 164 transitions. [2021-05-06 11:20:53,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:53,576 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 164 transitions. [2021-05-06 11:20:53,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:53,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:53,576 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:53,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:20:53,576 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:53,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:53,577 INFO L82 PathProgramCache]: Analyzing trace with hash -364118747, now seen corresponding path program 1 times [2021-05-06 11:20:53,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:53,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357384751] [2021-05-06 11:20:53,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:53,580 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:53,580 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:53,581 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:53,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:53,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:53,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:53,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:53,984 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:53,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357384751] [2021-05-06 11:20:53,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [357384751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:53,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:53,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:20:53,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841211423] [2021-05-06 11:20:53,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:20:53,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:53,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:20:53,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:53,986 INFO L87 Difference]: Start difference. First operand 127 states and 164 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:54,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:54,294 INFO L93 Difference]: Finished difference Result 208 states and 270 transitions. [2021-05-06 11:20:54,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:20:54,295 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:54,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:54,295 INFO L225 Difference]: With dead ends: 208 [2021-05-06 11:20:54,295 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 11:20:54,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 444.6ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:20:54,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 11:20:54,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 136. [2021-05-06 11:20:54,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.2900763358778626) internal successors, (169), 131 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:54,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 173 transitions. [2021-05-06 11:20:54,313 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 173 transitions. Word has length 51 [2021-05-06 11:20:54,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:54,313 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 173 transitions. [2021-05-06 11:20:54,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:54,313 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 173 transitions. [2021-05-06 11:20:54,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:54,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:54,314 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:54,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:20:54,314 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:54,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:54,314 INFO L82 PathProgramCache]: Analyzing trace with hash 247762981, now seen corresponding path program 1 times [2021-05-06 11:20:54,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:54,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481192800] [2021-05-06 11:20:54,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:54,317 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:54,317 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:54,318 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:54,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:54,661 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 55 [2021-05-06 11:20:54,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:54,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:54,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:54,689 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:54,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481192800] [2021-05-06 11:20:54,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [481192800] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:54,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:54,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:20:54,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616476597] [2021-05-06 11:20:54,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:20:54,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:54,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:20:54,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:54,690 INFO L87 Difference]: Start difference. First operand 136 states and 173 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:54,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:54,997 INFO L93 Difference]: Finished difference Result 173 states and 219 transitions. [2021-05-06 11:20:54,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:20:54,997 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:54,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:54,998 INFO L225 Difference]: With dead ends: 173 [2021-05-06 11:20:54,998 INFO L226 Difference]: Without dead ends: 148 [2021-05-06 11:20:54,998 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 437.1ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:20:54,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-06 11:20:55,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 145. [2021-05-06 11:20:55,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.2714285714285714) internal successors, (178), 140 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:55,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 182 transitions. [2021-05-06 11:20:55,019 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 182 transitions. Word has length 51 [2021-05-06 11:20:55,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:55,019 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 182 transitions. [2021-05-06 11:20:55,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:55,019 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 182 transitions. [2021-05-06 11:20:55,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:55,019 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:55,019 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:55,019 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:20:55,020 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:55,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:55,020 INFO L82 PathProgramCache]: Analyzing trace with hash -732070043, now seen corresponding path program 1 times [2021-05-06 11:20:55,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:55,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85978596] [2021-05-06 11:20:55,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:55,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:55,023 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:55,024 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:55,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:55,453 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 29 [2021-05-06 11:20:55,740 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 35 [2021-05-06 11:20:55,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:55,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:55,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:55,905 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:55,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85978596] [2021-05-06 11:20:55,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [85978596] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:55,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:55,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:20:55,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391375702] [2021-05-06 11:20:55,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:20:55,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:55,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:20:55,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:20:55,906 INFO L87 Difference]: Start difference. First operand 145 states and 182 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:56,076 INFO L93 Difference]: Finished difference Result 385 states and 496 transitions. [2021-05-06 11:20:56,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:20:56,076 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:56,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:56,077 INFO L225 Difference]: With dead ends: 385 [2021-05-06 11:20:56,077 INFO L226 Difference]: Without dead ends: 331 [2021-05-06 11:20:56,078 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 609.9ms TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:20:56,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-05-06 11:20:56,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 199. [2021-05-06 11:20:56,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.268041237113402) internal successors, (246), 194 states have internal predecessors, (246), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 250 transitions. [2021-05-06 11:20:56,107 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 250 transitions. Word has length 51 [2021-05-06 11:20:56,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:56,107 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 250 transitions. [2021-05-06 11:20:56,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,107 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 250 transitions. [2021-05-06 11:20:56,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:56,108 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:56,108 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:56,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:20:56,108 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:56,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:56,108 INFO L82 PathProgramCache]: Analyzing trace with hash -810376151, now seen corresponding path program 2 times [2021-05-06 11:20:56,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:56,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659491690] [2021-05-06 11:20:56,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:56,113 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:56,113 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:56,114 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:56,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:56,546 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 36 [2021-05-06 11:20:57,002 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 47 [2021-05-06 11:20:57,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:57,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:57,076 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:57,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659491690] [2021-05-06 11:20:57,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [659491690] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:57,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:57,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:20:57,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756134723] [2021-05-06 11:20:57,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:20:57,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:57,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:20:57,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:20:57,077 INFO L87 Difference]: Start difference. First operand 199 states and 250 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:57,456 INFO L93 Difference]: Finished difference Result 505 states and 652 transitions. [2021-05-06 11:20:57,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:20:57,457 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:57,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:57,458 INFO L225 Difference]: With dead ends: 505 [2021-05-06 11:20:57,458 INFO L226 Difference]: Without dead ends: 400 [2021-05-06 11:20:57,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 759.9ms TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:20:57,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-05-06 11:20:57,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 273. [2021-05-06 11:20:57,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 268 states have (on average 1.2649253731343284) internal successors, (339), 268 states have internal predecessors, (339), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 343 transitions. [2021-05-06 11:20:57,509 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 343 transitions. Word has length 51 [2021-05-06 11:20:57,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:57,509 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 343 transitions. [2021-05-06 11:20:57,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,510 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 343 transitions. [2021-05-06 11:20:57,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:57,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:57,510 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:57,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:20:57,510 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:57,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:57,511 INFO L82 PathProgramCache]: Analyzing trace with hash -4715419, now seen corresponding path program 1 times [2021-05-06 11:20:57,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:57,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276918962] [2021-05-06 11:20:57,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:57,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:57,519 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:57,519 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:57,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:58,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:58,292 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:58,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276918962] [2021-05-06 11:20:58,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [276918962] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:58,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:58,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:20:58,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040893906] [2021-05-06 11:20:58,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:20:58,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:58,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:20:58,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:20:58,293 INFO L87 Difference]: Start difference. First operand 273 states and 343 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:58,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:58,499 INFO L93 Difference]: Finished difference Result 447 states and 571 transitions. [2021-05-06 11:20:58,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:20:58,499 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:58,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:58,500 INFO L225 Difference]: With dead ends: 447 [2021-05-06 11:20:58,500 INFO L226 Difference]: Without dead ends: 403 [2021-05-06 11:20:58,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 506.7ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:20:58,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-06 11:20:58,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 284. [2021-05-06 11:20:58,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 279 states have (on average 1.2544802867383513) internal successors, (350), 279 states have internal predecessors, (350), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:58,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 354 transitions. [2021-05-06 11:20:58,541 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 354 transitions. Word has length 51 [2021-05-06 11:20:58,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:58,541 INFO L480 AbstractCegarLoop]: Abstraction has 284 states and 354 transitions. [2021-05-06 11:20:58,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:58,542 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 354 transitions. [2021-05-06 11:20:58,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:20:58,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:58,542 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:58,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:20:58,542 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:58,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:58,543 INFO L82 PathProgramCache]: Analyzing trace with hash -198494423, now seen corresponding path program 2 times [2021-05-06 11:20:58,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:58,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261500331] [2021-05-06 11:20:58,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:58,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:58,546 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:58,547 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:58,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,201 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 55 [2021-05-06 11:20:59,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:59,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:59,293 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:59,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261500331] [2021-05-06 11:20:59,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1261500331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:59,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:59,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:20:59,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685292129] [2021-05-06 11:20:59,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:20:59,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:59,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:20:59,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:20:59,294 INFO L87 Difference]: Start difference. First operand 284 states and 354 transitions. Second operand has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:59,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:59,678 INFO L93 Difference]: Finished difference Result 523 states and 656 transitions. [2021-05-06 11:20:59,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:20:59,679 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 11:20:59,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:59,682 INFO L225 Difference]: With dead ends: 523 [2021-05-06 11:20:59,683 INFO L226 Difference]: Without dead ends: 390 [2021-05-06 11:20:59,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 605.4ms TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:20:59,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-05-06 11:20:59,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 309. [2021-05-06 11:20:59,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 304 states have (on average 1.2532894736842106) internal successors, (381), 304 states have internal predecessors, (381), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:59,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 385 transitions. [2021-05-06 11:20:59,780 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 385 transitions. Word has length 51 [2021-05-06 11:20:59,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:59,780 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 385 transitions. [2021-05-06 11:20:59,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:59,781 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 385 transitions. [2021-05-06 11:20:59,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:20:59,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:59,781 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 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] [2021-05-06 11:20:59,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:20:59,781 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:59,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:59,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1931900780, now seen corresponding path program 1 times [2021-05-06 11:20:59,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:59,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78009542] [2021-05-06 11:20:59,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:59,803 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:59,804 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:59,804 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:59,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:59,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:59,938 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:59,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78009542] [2021-05-06 11:20:59,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [78009542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:59,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:59,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:20:59,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287655043] [2021-05-06 11:20:59,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:20:59,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:59,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:20:59,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:20:59,939 INFO L87 Difference]: Start difference. First operand 309 states and 385 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:00,611 INFO L93 Difference]: Finished difference Result 2241 states and 2810 transitions. [2021-05-06 11:21:00,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:00,611 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-05-06 11:21:00,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:00,617 INFO L225 Difference]: With dead ends: 2241 [2021-05-06 11:21:00,617 INFO L226 Difference]: Without dead ends: 2212 [2021-05-06 11:21:00,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 115.5ms TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:00,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2212 states. [2021-05-06 11:21:00,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2212 to 313. [2021-05-06 11:21:00,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 308 states have (on average 1.2564935064935066) internal successors, (387), 308 states have internal predecessors, (387), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 391 transitions. [2021-05-06 11:21:00,685 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 391 transitions. Word has length 52 [2021-05-06 11:21:00,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:00,685 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 391 transitions. [2021-05-06 11:21:00,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,686 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 391 transitions. [2021-05-06 11:21:00,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:21:00,686 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:00,686 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 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] [2021-05-06 11:21:00,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:21:00,687 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:00,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:00,687 INFO L82 PathProgramCache]: Analyzing trace with hash -2072849753, now seen corresponding path program 1 times [2021-05-06 11:21:00,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:00,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507639818] [2021-05-06 11:21:00,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:00,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:00,690 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:00,691 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:00,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:00,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,739 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:00,739 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:00,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507639818] [2021-05-06 11:21:00,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [507639818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:00,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:00,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:21:00,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203829528] [2021-05-06 11:21:00,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:21:00,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:00,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:21:00,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:21:00,740 INFO L87 Difference]: Start difference. First operand 313 states and 391 transitions. Second operand has 6 states, 6 states have (on average 6.5) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:00,868 INFO L93 Difference]: Finished difference Result 570 states and 711 transitions. [2021-05-06 11:21:00,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:21:00,868 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-06 11:21:00,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:00,869 INFO L225 Difference]: With dead ends: 570 [2021-05-06 11:21:00,870 INFO L226 Difference]: Without dead ends: 308 [2021-05-06 11:21:00,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.1ms TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:21:00,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-06 11:21:00,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 277. [2021-05-06 11:21:00,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 272 states have (on average 1.1948529411764706) internal successors, (325), 272 states have internal predecessors, (325), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 329 transitions. [2021-05-06 11:21:00,922 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 329 transitions. Word has length 54 [2021-05-06 11:21:00,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:00,922 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 329 transitions. [2021-05-06 11:21:00,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,922 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 329 transitions. [2021-05-06 11:21:00,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:21:00,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:00,923 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 5, 5, 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] [2021-05-06 11:21:00,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:21:00,923 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:00,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:00,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1954216222, now seen corresponding path program 2 times [2021-05-06 11:21:00,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:00,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486903156] [2021-05-06 11:21:00,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:00,927 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:00,928 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:00,929 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:01,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:01,066 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:01,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486903156] [2021-05-06 11:21:01,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1486903156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:01,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:01,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:21:01,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226948569] [2021-05-06 11:21:01,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:21:01,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:01,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:21:01,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:01,068 INFO L87 Difference]: Start difference. First operand 277 states and 329 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:01,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:01,991 INFO L93 Difference]: Finished difference Result 2465 states and 2912 transitions. [2021-05-06 11:21:01,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:21:01,991 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:21:01,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:01,998 INFO L225 Difference]: With dead ends: 2465 [2021-05-06 11:21:01,998 INFO L226 Difference]: Without dead ends: 2436 [2021-05-06 11:21:02,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 115.9ms TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:02,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2436 states. [2021-05-06 11:21:02,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2436 to 281. [2021-05-06 11:21:02,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 276 states have (on average 1.1992753623188406) internal successors, (331), 276 states have internal predecessors, (331), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 335 transitions. [2021-05-06 11:21:02,105 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 335 transitions. Word has length 56 [2021-05-06 11:21:02,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:02,105 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 335 transitions. [2021-05-06 11:21:02,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,105 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 335 transitions. [2021-05-06 11:21:02,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:21:02,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:02,106 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 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] [2021-05-06 11:21:02,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:21:02,106 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:02,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:02,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1813405083, now seen corresponding path program 2 times [2021-05-06 11:21:02,106 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:02,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844589595] [2021-05-06 11:21:02,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:02,109 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:02,110 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:02,110 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844589595] [2021-05-06 11:21:02,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1844589595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:21:02,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822491136] [2021-05-06 11:21:02,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:21:02,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:21:02,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:21:02,245 INFO L87 Difference]: Start difference. First operand 281 states and 335 transitions. Second operand has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:02,417 INFO L93 Difference]: Finished difference Result 594 states and 700 transitions. [2021-05-06 11:21:02,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:21:02,417 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-06 11:21:02,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:02,418 INFO L225 Difference]: With dead ends: 594 [2021-05-06 11:21:02,418 INFO L226 Difference]: Without dead ends: 367 [2021-05-06 11:21:02,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 107.5ms TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:21:02,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2021-05-06 11:21:02,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 303. [2021-05-06 11:21:02,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 298 states have (on average 1.191275167785235) internal successors, (355), 298 states have internal predecessors, (355), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 359 transitions. [2021-05-06 11:21:02,486 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 359 transitions. Word has length 60 [2021-05-06 11:21:02,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:02,486 INFO L480 AbstractCegarLoop]: Abstraction has 303 states and 359 transitions. [2021-05-06 11:21:02,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.857142857142857) internal successors, (41), 6 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,486 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 359 transitions. [2021-05-06 11:21:02,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:21:02,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:02,487 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 5, 5, 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] [2021-05-06 11:21:02,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:21:02,487 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:02,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:02,487 INFO L82 PathProgramCache]: Analyzing trace with hash 713223000, now seen corresponding path program 3 times [2021-05-06 11:21:02,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:02,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426642939] [2021-05-06 11:21:02,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:02,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:02,492 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:02,495 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,704 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426642939] [2021-05-06 11:21:02,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1426642939] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:21:02,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057889445] [2021-05-06 11:21:02,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:21:02,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:21:02,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:02,706 INFO L87 Difference]: Start difference. First operand 303 states and 359 transitions. Second operand has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:03,905 INFO L93 Difference]: Finished difference Result 2769 states and 3268 transitions. [2021-05-06 11:21:03,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:21:03,906 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-06 11:21:03,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:03,912 INFO L225 Difference]: With dead ends: 2769 [2021-05-06 11:21:03,912 INFO L226 Difference]: Without dead ends: 2740 [2021-05-06 11:21:03,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 180.9ms TimeCoverageRelationStatistics Valid=36, Invalid=236, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:21:03,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2740 states. [2021-05-06 11:21:03,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2740 to 307. [2021-05-06 11:21:03,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 302 states have (on average 1.195364238410596) internal successors, (361), 302 states have internal predecessors, (361), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 365 transitions. [2021-05-06 11:21:03,996 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 365 transitions. Word has length 60 [2021-05-06 11:21:03,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:03,997 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 365 transitions. [2021-05-06 11:21:03,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.8125) internal successors, (45), 15 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,997 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 365 transitions. [2021-05-06 11:21:03,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:21:03,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:03,997 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 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] [2021-05-06 11:21:03,998 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:21:03,998 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:03,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:03,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1971018387, now seen corresponding path program 3 times [2021-05-06 11:21:03,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:03,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863724299] [2021-05-06 11:21:03,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:04,002 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:04,002 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:04,003 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:04,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:04,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:04,307 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:04,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863724299] [2021-05-06 11:21:04,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [863724299] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:04,307 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:04,307 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:04,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133192150] [2021-05-06 11:21:04,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:04,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:04,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:04,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:04,308 INFO L87 Difference]: Start difference. First operand 307 states and 365 transitions. Second operand has 13 states, 13 states have (on average 3.3076923076923075) internal successors, (43), 12 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:04,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:04,629 INFO L93 Difference]: Finished difference Result 361 states and 423 transitions. [2021-05-06 11:21:04,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:04,629 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3076923076923075) internal successors, (43), 12 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 11:21:04,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:04,630 INFO L225 Difference]: With dead ends: 361 [2021-05-06 11:21:04,630 INFO L226 Difference]: Without dead ends: 285 [2021-05-06 11:21:04,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 347.4ms TimeCoverageRelationStatistics Valid=90, Invalid=252, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:04,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-05-06 11:21:04,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 285. [2021-05-06 11:21:04,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 280 states have (on average 1.2) internal successors, (336), 280 states have internal predecessors, (336), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:04,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 340 transitions. [2021-05-06 11:21:04,700 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 340 transitions. Word has length 61 [2021-05-06 11:21:04,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:04,701 INFO L480 AbstractCegarLoop]: Abstraction has 285 states and 340 transitions. [2021-05-06 11:21:04,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.3076923076923075) internal successors, (43), 12 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:04,726 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 340 transitions. [2021-05-06 11:21:04,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:21:04,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:04,726 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 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] [2021-05-06 11:21:04,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:21:04,726 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:04,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:04,727 INFO L82 PathProgramCache]: Analyzing trace with hash -891810688, now seen corresponding path program 4 times [2021-05-06 11:21:04,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:04,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208388262] [2021-05-06 11:21:04,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:04,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:04,731 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:04,732 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:04,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:04,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:04,950 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:04,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208388262] [2021-05-06 11:21:04,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1208388262] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:04,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:04,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:21:04,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768659186] [2021-05-06 11:21:04,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:21:04,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:04,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:21:04,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:04,953 INFO L87 Difference]: Start difference. First operand 285 states and 340 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:05,231 INFO L93 Difference]: Finished difference Result 424 states and 500 transitions. [2021-05-06 11:21:05,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:05,232 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 11:21:05,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:05,233 INFO L225 Difference]: With dead ends: 424 [2021-05-06 11:21:05,233 INFO L226 Difference]: Without dead ends: 419 [2021-05-06 11:21:05,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 171.7ms TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:05,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-05-06 11:21:05,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 313. [2021-05-06 11:21:05,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 308 states have (on average 1.1883116883116882) internal successors, (366), 308 states have internal predecessors, (366), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 370 transitions. [2021-05-06 11:21:05,319 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 370 transitions. Word has length 62 [2021-05-06 11:21:05,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:05,319 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 370 transitions. [2021-05-06 11:21:05,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,319 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 370 transitions. [2021-05-06 11:21:05,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:21:05,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:05,320 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 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] [2021-05-06 11:21:05,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:21:05,320 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:05,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:05,320 INFO L82 PathProgramCache]: Analyzing trace with hash 475673560, now seen corresponding path program 5 times [2021-05-06 11:21:05,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:05,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504275715] [2021-05-06 11:21:05,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:05,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:05,326 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:05,327 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:05,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:05,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,412 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:05,412 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:05,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504275715] [2021-05-06 11:21:05,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [504275715] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:05,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:05,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:21:05,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579220966] [2021-05-06 11:21:05,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:21:05,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:05,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:21:05,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:05,413 INFO L87 Difference]: Start difference. First operand 313 states and 370 transitions. Second operand has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:05,733 INFO L93 Difference]: Finished difference Result 719 states and 840 transitions. [2021-05-06 11:21:05,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:21:05,734 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 11:21:05,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:05,735 INFO L225 Difference]: With dead ends: 719 [2021-05-06 11:21:05,736 INFO L226 Difference]: Without dead ends: 670 [2021-05-06 11:21:05,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 62.1ms TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:05,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-06 11:21:05,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 335. [2021-05-06 11:21:05,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1818181818181819) internal successors, (390), 330 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 394 transitions. [2021-05-06 11:21:05,828 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 394 transitions. Word has length 63 [2021-05-06 11:21:05,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:05,828 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 394 transitions. [2021-05-06 11:21:05,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,828 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 394 transitions. [2021-05-06 11:21:05,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:21:05,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:05,828 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:05,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:21:05,829 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:05,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:05,829 INFO L82 PathProgramCache]: Analyzing trace with hash -2031628323, now seen corresponding path program 6 times [2021-05-06 11:21:05,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:05,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009793225] [2021-05-06 11:21:05,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:05,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:05,832 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:05,833 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:05,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:05,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:05,926 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:05,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009793225] [2021-05-06 11:21:05,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2009793225] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:05,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:05,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:21:05,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364586288] [2021-05-06 11:21:05,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:21:05,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:05,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:21:05,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:05,927 INFO L87 Difference]: Start difference. First operand 335 states and 394 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:06,410 INFO L93 Difference]: Finished difference Result 991 states and 1155 transitions. [2021-05-06 11:21:06,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:21:06,410 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:21:06,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:06,412 INFO L225 Difference]: With dead ends: 991 [2021-05-06 11:21:06,412 INFO L226 Difference]: Without dead ends: 942 [2021-05-06 11:21:06,413 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 82.0ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:06,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2021-05-06 11:21:06,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 335. [2021-05-06 11:21:06,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1818181818181819) internal successors, (390), 330 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 394 transitions. [2021-05-06 11:21:06,509 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 394 transitions. Word has length 65 [2021-05-06 11:21:06,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:06,509 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 394 transitions. [2021-05-06 11:21:06,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,509 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 394 transitions. [2021-05-06 11:21:06,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:21:06,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:06,511 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:06,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:21:06,511 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:06,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:06,511 INFO L82 PathProgramCache]: Analyzing trace with hash -2072084830, now seen corresponding path program 7 times [2021-05-06 11:21:06,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:06,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135618652] [2021-05-06 11:21:06,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:06,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:06,515 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:06,517 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:06,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:06,638 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:06,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135618652] [2021-05-06 11:21:06,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [135618652] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:06,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:06,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:21:06,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060360484] [2021-05-06 11:21:06,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:21:06,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:06,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:21:06,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:06,639 INFO L87 Difference]: Start difference. First operand 335 states and 394 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:07,287 INFO L93 Difference]: Finished difference Result 1257 states and 1464 transitions. [2021-05-06 11:21:07,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:07,287 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-06 11:21:07,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:07,290 INFO L225 Difference]: With dead ends: 1257 [2021-05-06 11:21:07,290 INFO L226 Difference]: Without dead ends: 1208 [2021-05-06 11:21:07,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 116.2ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:07,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1208 states. [2021-05-06 11:21:07,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1208 to 335. [2021-05-06 11:21:07,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1818181818181819) internal successors, (390), 330 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 394 transitions. [2021-05-06 11:21:07,391 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 394 transitions. Word has length 67 [2021-05-06 11:21:07,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:07,391 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 394 transitions. [2021-05-06 11:21:07,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,392 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 394 transitions. [2021-05-06 11:21:07,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:21:07,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:07,392 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:07,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:21:07,392 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:07,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:07,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1998884903, now seen corresponding path program 8 times [2021-05-06 11:21:07,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:07,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862417159] [2021-05-06 11:21:07,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:07,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:07,396 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:07,398 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:07,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:07,513 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:07,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862417159] [2021-05-06 11:21:07,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [862417159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:07,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:07,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:21:07,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690406718] [2021-05-06 11:21:07,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:21:07,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:07,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:21:07,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:07,514 INFO L87 Difference]: Start difference. First operand 335 states and 394 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:08,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:08,297 INFO L93 Difference]: Finished difference Result 1523 states and 1773 transitions. [2021-05-06 11:21:08,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:08,298 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 11:21:08,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:08,302 INFO L225 Difference]: With dead ends: 1523 [2021-05-06 11:21:08,302 INFO L226 Difference]: Without dead ends: 1474 [2021-05-06 11:21:08,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 105.5ms TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:08,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1474 states. [2021-05-06 11:21:08,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1474 to 335. [2021-05-06 11:21:08,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1818181818181819) internal successors, (390), 330 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:08,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 394 transitions. [2021-05-06 11:21:08,417 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 394 transitions. Word has length 69 [2021-05-06 11:21:08,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:08,417 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 394 transitions. [2021-05-06 11:21:08,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:08,417 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 394 transitions. [2021-05-06 11:21:08,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:21:08,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:08,418 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:08,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:21:08,418 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:08,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:08,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1485591660, now seen corresponding path program 9 times [2021-05-06 11:21:08,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:08,418 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747759049] [2021-05-06 11:21:08,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:08,422 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:08,422 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:08,422 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:08,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:08,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:08,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:08,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:08,564 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:08,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747759049] [2021-05-06 11:21:08,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [747759049] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:08,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:08,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:08,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215800044] [2021-05-06 11:21:08,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:08,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:08,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:08,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:08,565 INFO L87 Difference]: Start difference. First operand 335 states and 394 transitions. Second operand has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 12 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:09,577 INFO L93 Difference]: Finished difference Result 1789 states and 2082 transitions. [2021-05-06 11:21:09,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:09,578 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 12 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:21:09,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:09,582 INFO L225 Difference]: With dead ends: 1789 [2021-05-06 11:21:09,582 INFO L226 Difference]: Without dead ends: 1740 [2021-05-06 11:21:09,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 132.1ms TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:09,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1740 states. [2021-05-06 11:21:09,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1740 to 335. [2021-05-06 11:21:09,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.1818181818181819) internal successors, (390), 330 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 394 transitions. [2021-05-06 11:21:09,696 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 394 transitions. Word has length 71 [2021-05-06 11:21:09,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:09,696 INFO L480 AbstractCegarLoop]: Abstraction has 335 states and 394 transitions. [2021-05-06 11:21:09,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 12 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:09,696 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 394 transitions. [2021-05-06 11:21:09,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:21:09,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:09,697 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 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] [2021-05-06 11:21:09,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:21:09,697 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:09,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:09,697 INFO L82 PathProgramCache]: Analyzing trace with hash 930201970, now seen corresponding path program 10 times [2021-05-06 11:21:09,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:09,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888971302] [2021-05-06 11:21:09,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:09,701 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:09,701 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:09,701 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:09,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:10,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,672 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:10,672 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:10,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888971302] [2021-05-06 11:21:10,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [888971302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:10,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:10,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:21:10,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703941603] [2021-05-06 11:21:10,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:21:10,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:10,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:21:10,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:10,673 INFO L87 Difference]: Start difference. First operand 335 states and 394 transitions. Second operand has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:11,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:11,814 INFO L93 Difference]: Finished difference Result 1103 states and 1283 transitions. [2021-05-06 11:21:11,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:21:11,814 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-06 11:21:11,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:11,816 INFO L225 Difference]: With dead ends: 1103 [2021-05-06 11:21:11,816 INFO L226 Difference]: Without dead ends: 909 [2021-05-06 11:21:11,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 1210.6ms TimeCoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:21:11,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2021-05-06 11:21:11,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 487. [2021-05-06 11:21:11,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 482 states have (on average 1.1493775933609958) internal successors, (554), 482 states have internal predecessors, (554), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:11,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 558 transitions. [2021-05-06 11:21:11,989 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 558 transitions. Word has length 72 [2021-05-06 11:21:11,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:11,990 INFO L480 AbstractCegarLoop]: Abstraction has 487 states and 558 transitions. [2021-05-06 11:21:11,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:11,990 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 558 transitions. [2021-05-06 11:21:11,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:21:11,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:11,991 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 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] [2021-05-06 11:21:11,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:21:11,991 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:11,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:11,991 INFO L82 PathProgramCache]: Analyzing trace with hash -188563146, now seen corresponding path program 11 times [2021-05-06 11:21:11,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:11,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597880106] [2021-05-06 11:21:11,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:11,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:11,994 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:11,995 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:12,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:12,796 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 66 [2021-05-06 11:21:12,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:12,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:12,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:12,839 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:12,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597880106] [2021-05-06 11:21:12,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1597880106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:12,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:12,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:21:12,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723633670] [2021-05-06 11:21:12,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:21:12,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:12,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:21:12,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:21:12,840 INFO L87 Difference]: Start difference. First operand 487 states and 558 transitions. Second operand has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:13,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:13,731 INFO L93 Difference]: Finished difference Result 870 states and 1003 transitions. [2021-05-06 11:21:13,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:21:13,731 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-06 11:21:13,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:13,733 INFO L225 Difference]: With dead ends: 870 [2021-05-06 11:21:13,733 INFO L226 Difference]: Without dead ends: 807 [2021-05-06 11:21:13,734 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 911.4ms TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:21:13,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2021-05-06 11:21:14,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 662. [2021-05-06 11:21:14,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 657 states have (on average 1.1552511415525115) internal successors, (759), 657 states have internal predecessors, (759), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:14,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 763 transitions. [2021-05-06 11:21:14,012 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 763 transitions. Word has length 72 [2021-05-06 11:21:14,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:14,012 INFO L480 AbstractCegarLoop]: Abstraction has 662 states and 763 transitions. [2021-05-06 11:21:14,013 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:14,013 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 763 transitions. [2021-05-06 11:21:14,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:21:14,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:14,014 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 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] [2021-05-06 11:21:14,014 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:21:14,014 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:14,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:14,014 INFO L82 PathProgramCache]: Analyzing trace with hash 673002482, now seen corresponding path program 12 times [2021-05-06 11:21:14,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:14,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [25914224] [2021-05-06 11:21:14,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:14,018 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:14,018 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:14,018 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:14,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:14,324 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 39 [2021-05-06 11:21:14,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:14,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:14,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:14,974 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:14,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [25914224] [2021-05-06 11:21:14,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [25914224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:14,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:14,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:21:14,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565457549] [2021-05-06 11:21:14,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:21:14,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:14,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:21:14,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:14,975 INFO L87 Difference]: Start difference. First operand 662 states and 763 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:16,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:16,382 INFO L93 Difference]: Finished difference Result 1402 states and 1611 transitions. [2021-05-06 11:21:16,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:21:16,383 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-06 11:21:16,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:16,386 INFO L225 Difference]: With dead ends: 1402 [2021-05-06 11:21:16,386 INFO L226 Difference]: Without dead ends: 1358 [2021-05-06 11:21:16,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 1282.3ms TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:21:16,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1358 states. [2021-05-06 11:21:16,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1358 to 909. [2021-05-06 11:21:16,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 909 states, 904 states have (on average 1.157079646017699) internal successors, (1046), 904 states have internal predecessors, (1046), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:16,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 909 states to 909 states and 1050 transitions. [2021-05-06 11:21:16,826 INFO L78 Accepts]: Start accepts. Automaton has 909 states and 1050 transitions. Word has length 72 [2021-05-06 11:21:16,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:16,826 INFO L480 AbstractCegarLoop]: Abstraction has 909 states and 1050 transitions. [2021-05-06 11:21:16,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:16,826 INFO L276 IsEmpty]: Start isEmpty. Operand 909 states and 1050 transitions. [2021-05-06 11:21:16,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:21:16,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:16,828 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 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] [2021-05-06 11:21:16,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:21:16,828 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:16,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:16,828 INFO L82 PathProgramCache]: Analyzing trace with hash 479223478, now seen corresponding path program 13 times [2021-05-06 11:21:16,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:16,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079919482] [2021-05-06 11:21:16,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:16,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:16,832 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:16,833 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:16,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:17,267 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 50 [2021-05-06 11:21:18,041 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 60 [2021-05-06 11:21:18,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:18,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:18,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:18,149 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:18,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079919482] [2021-05-06 11:21:18,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1079919482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:18,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:18,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:21:18,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21663264] [2021-05-06 11:21:18,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:21:18,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:18,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:21:18,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:21:18,150 INFO L87 Difference]: Start difference. First operand 909 states and 1050 transitions. Second operand has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:18,785 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 51 [2021-05-06 11:21:19,682 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 47 [2021-05-06 11:21:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:19,983 INFO L93 Difference]: Finished difference Result 1541 states and 1756 transitions. [2021-05-06 11:21:19,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:21:19,984 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-05-06 11:21:19,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:19,988 INFO L225 Difference]: With dead ends: 1541 [2021-05-06 11:21:19,988 INFO L226 Difference]: Without dead ends: 1420 [2021-05-06 11:21:19,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1915.0ms TimeCoverageRelationStatistics Valid=250, Invalid=940, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:21:19,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2021-05-06 11:21:20,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1151. [2021-05-06 11:21:20,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1151 states, 1146 states have (on average 1.1457242582897034) internal successors, (1313), 1146 states have internal predecessors, (1313), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:20,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1151 states to 1151 states and 1317 transitions. [2021-05-06 11:21:20,475 INFO L78 Accepts]: Start accepts. Automaton has 1151 states and 1317 transitions. Word has length 72 [2021-05-06 11:21:20,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:20,475 INFO L480 AbstractCegarLoop]: Abstraction has 1151 states and 1317 transitions. [2021-05-06 11:21:20,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.6666666666666665) internal successors, (56), 20 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:20,475 INFO L276 IsEmpty]: Start isEmpty. Operand 1151 states and 1317 transitions. [2021-05-06 11:21:20,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:21:20,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:20,491 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:20,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:21:20,491 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:20,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:20,492 INFO L82 PathProgramCache]: Analyzing trace with hash 2132024177, now seen corresponding path program 14 times [2021-05-06 11:21:20,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:20,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840062258] [2021-05-06 11:21:20,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:20,495 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:20,495 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:20,496 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:20,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:20,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:20,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:20,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:20,713 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:20,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840062258] [2021-05-06 11:21:20,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1840062258] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:20,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:20,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:20,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458888298] [2021-05-06 11:21:20,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:20,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:20,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:20,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:20,715 INFO L87 Difference]: Start difference. First operand 1151 states and 1317 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:22,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:22,865 INFO L93 Difference]: Finished difference Result 3566 states and 4106 transitions. [2021-05-06 11:21:22,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:21:22,866 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 11:21:22,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:22,873 INFO L225 Difference]: With dead ends: 3566 [2021-05-06 11:21:22,873 INFO L226 Difference]: Without dead ends: 3517 [2021-05-06 11:21:22,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 213.5ms TimeCoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:22,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3517 states. [2021-05-06 11:21:23,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3517 to 1151. [2021-05-06 11:21:23,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1151 states, 1146 states have (on average 1.1457242582897034) internal successors, (1313), 1146 states have internal predecessors, (1313), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1151 states to 1151 states and 1317 transitions. [2021-05-06 11:21:23,404 INFO L78 Accepts]: Start accepts. Automaton has 1151 states and 1317 transitions. Word has length 73 [2021-05-06 11:21:23,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:23,404 INFO L480 AbstractCegarLoop]: Abstraction has 1151 states and 1317 transitions. [2021-05-06 11:21:23,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,404 INFO L276 IsEmpty]: Start isEmpty. Operand 1151 states and 1317 transitions. [2021-05-06 11:21:23,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:21:23,422 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:23,423 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2021-05-06 11:21:23,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:21:23,423 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:23,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:23,423 INFO L82 PathProgramCache]: Analyzing trace with hash -505226483, now seen corresponding path program 15 times [2021-05-06 11:21:23,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:23,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360598675] [2021-05-06 11:21:23,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:23,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:23,426 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:23,427 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:23,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:23,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:23,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:23,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:23,576 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:23,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360598675] [2021-05-06 11:21:23,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [360598675] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:23,576 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:23,576 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:21:23,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989513809] [2021-05-06 11:21:23,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:21:23,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:23,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:21:23,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:23,577 INFO L87 Difference]: Start difference. First operand 1151 states and 1317 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:24,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:24,713 INFO L93 Difference]: Finished difference Result 2095 states and 2395 transitions. [2021-05-06 11:21:24,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:24,713 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:21:24,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:24,717 INFO L225 Difference]: With dead ends: 2095 [2021-05-06 11:21:24,717 INFO L226 Difference]: Without dead ends: 1986 [2021-05-06 11:21:24,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 123.3ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:24,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1986 states. [2021-05-06 11:21:25,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1986 to 1233. [2021-05-06 11:21:25,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1233 states, 1228 states have (on average 1.1425081433224755) internal successors, (1403), 1228 states have internal predecessors, (1403), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:25,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 1407 transitions. [2021-05-06 11:21:25,243 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 1407 transitions. Word has length 74 [2021-05-06 11:21:25,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:25,244 INFO L480 AbstractCegarLoop]: Abstraction has 1233 states and 1407 transitions. [2021-05-06 11:21:25,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:25,244 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 1407 transitions. [2021-05-06 11:21:25,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:21:25,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:25,245 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:25,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:21:25,245 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:25,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:25,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1752054978, now seen corresponding path program 4 times [2021-05-06 11:21:25,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:25,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593004879] [2021-05-06 11:21:25,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:25,249 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:25,249 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:25,250 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:25,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:25,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:25,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:25,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:25,442 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:25,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593004879] [2021-05-06 11:21:25,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1593004879] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:25,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:25,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:21:25,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981826481] [2021-05-06 11:21:25,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:21:25,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:25,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:21:25,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:25,443 INFO L87 Difference]: Start difference. First operand 1233 states and 1407 transitions. Second operand has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:28,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:28,913 INFO L93 Difference]: Finished difference Result 6103 states and 7076 transitions. [2021-05-06 11:21:28,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:21:28,913 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:21:28,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:28,920 INFO L225 Difference]: With dead ends: 6103 [2021-05-06 11:21:28,920 INFO L226 Difference]: Without dead ends: 6059 [2021-05-06 11:21:28,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 174.1ms TimeCoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:28,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6059 states. [2021-05-06 11:21:29,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6059 to 1237. [2021-05-06 11:21:29,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1232 states have (on average 1.1436688311688312) internal successors, (1409), 1232 states have internal predecessors, (1409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:29,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1413 transitions. [2021-05-06 11:21:29,471 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1413 transitions. Word has length 74 [2021-05-06 11:21:29,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:29,471 INFO L480 AbstractCegarLoop]: Abstraction has 1237 states and 1413 transitions. [2021-05-06 11:21:29,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:29,471 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1413 transitions. [2021-05-06 11:21:29,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:21:29,473 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:29,473 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:29,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:21:29,473 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:29,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:29,473 INFO L82 PathProgramCache]: Analyzing trace with hash 583415094, now seen corresponding path program 16 times [2021-05-06 11:21:29,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:29,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730842251] [2021-05-06 11:21:29,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:29,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:29,477 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:29,477 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:29,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:29,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:29,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:29,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:29,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:29,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730842251] [2021-05-06 11:21:29,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1730842251] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:29,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:29,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:21:29,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524342350] [2021-05-06 11:21:29,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:21:29,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:29,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:21:29,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:29,631 INFO L87 Difference]: Start difference. First operand 1237 states and 1413 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:32,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:32,076 INFO L93 Difference]: Finished difference Result 4044 states and 4656 transitions. [2021-05-06 11:21:32,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:21:32,077 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-06 11:21:32,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:32,082 INFO L225 Difference]: With dead ends: 4044 [2021-05-06 11:21:32,082 INFO L226 Difference]: Without dead ends: 3995 [2021-05-06 11:21:32,082 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 155.1ms TimeCoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:21:32,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3995 states. [2021-05-06 11:21:32,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3995 to 1237. [2021-05-06 11:21:32,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1232 states have (on average 1.1436688311688312) internal successors, (1409), 1232 states have internal predecessors, (1409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:32,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1413 transitions. [2021-05-06 11:21:32,689 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1413 transitions. Word has length 75 [2021-05-06 11:21:32,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:32,689 INFO L480 AbstractCegarLoop]: Abstraction has 1237 states and 1413 transitions. [2021-05-06 11:21:32,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:32,690 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1413 transitions. [2021-05-06 11:21:32,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:21:32,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:32,691 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 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] [2021-05-06 11:21:32,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:21:32,691 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:32,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:32,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1267467800, now seen corresponding path program 17 times [2021-05-06 11:21:32,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:32,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083855926] [2021-05-06 11:21:32,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:32,695 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:32,695 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:32,696 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:32,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:32,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:32,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:32,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:32,843 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:32,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083855926] [2021-05-06 11:21:32,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1083855926] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:32,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:32,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:21:32,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684561737] [2021-05-06 11:21:32,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:21:32,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:32,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:21:32,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:32,844 INFO L87 Difference]: Start difference. First operand 1237 states and 1413 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:34,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:34,497 INFO L93 Difference]: Finished difference Result 2586 states and 2958 transitions. [2021-05-06 11:21:34,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:34,497 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-06 11:21:34,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:34,500 INFO L225 Difference]: With dead ends: 2586 [2021-05-06 11:21:34,500 INFO L226 Difference]: Without dead ends: 2477 [2021-05-06 11:21:34,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 175.0ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:34,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2477 states. [2021-05-06 11:21:35,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2477 to 1237. [2021-05-06 11:21:35,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1232 states have (on average 1.1436688311688312) internal successors, (1409), 1232 states have internal predecessors, (1409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:35,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1413 transitions. [2021-05-06 11:21:35,124 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1413 transitions. Word has length 76 [2021-05-06 11:21:35,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:35,124 INFO L480 AbstractCegarLoop]: Abstraction has 1237 states and 1413 transitions. [2021-05-06 11:21:35,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:35,124 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1413 transitions. [2021-05-06 11:21:35,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:21:35,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:35,126 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:35,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:21:35,126 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:35,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:35,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1571229253, now seen corresponding path program 18 times [2021-05-06 11:21:35,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:35,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776973861] [2021-05-06 11:21:35,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:35,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:35,130 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:35,130 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:35,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:35,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:35,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:35,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:35,361 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:35,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776973861] [2021-05-06 11:21:35,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1776973861] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:35,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:35,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:21:35,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104625858] [2021-05-06 11:21:35,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:21:35,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:35,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:21:35,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:35,362 INFO L87 Difference]: Start difference. First operand 1237 states and 1413 transitions. Second operand has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:38,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:38,526 INFO L93 Difference]: Finished difference Result 4518 states and 5200 transitions. [2021-05-06 11:21:38,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:21:38,527 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:21:38,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:38,532 INFO L225 Difference]: With dead ends: 4518 [2021-05-06 11:21:38,532 INFO L226 Difference]: Without dead ends: 4469 [2021-05-06 11:21:38,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 202.4ms TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:38,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4469 states. [2021-05-06 11:21:39,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4469 to 1237. [2021-05-06 11:21:39,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1232 states have (on average 1.1436688311688312) internal successors, (1409), 1232 states have internal predecessors, (1409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:39,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1413 transitions. [2021-05-06 11:21:39,162 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1413 transitions. Word has length 77 [2021-05-06 11:21:39,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:39,163 INFO L480 AbstractCegarLoop]: Abstraction has 1237 states and 1413 transitions. [2021-05-06 11:21:39,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.125) internal successors, (50), 15 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:39,163 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1413 transitions. [2021-05-06 11:21:39,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 11:21:39,164 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:39,164 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 3, 3, 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] [2021-05-06 11:21:39,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:21:39,164 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:39,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:39,165 INFO L82 PathProgramCache]: Analyzing trace with hash 658034179, now seen corresponding path program 19 times [2021-05-06 11:21:39,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:39,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579846591] [2021-05-06 11:21:39,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:39,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:39,168 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:39,169 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:39,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:39,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:39,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:39,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:39,343 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:39,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579846591] [2021-05-06 11:21:39,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [579846591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:39,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:39,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:39,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109859673] [2021-05-06 11:21:39,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:39,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:39,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:39,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:39,344 INFO L87 Difference]: Start difference. First operand 1237 states and 1413 transitions. Second operand has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:41,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:41,455 INFO L93 Difference]: Finished difference Result 3116 states and 3566 transitions. [2021-05-06 11:21:41,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:21:41,455 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-06 11:21:41,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:41,459 INFO L225 Difference]: With dead ends: 3116 [2021-05-06 11:21:41,459 INFO L226 Difference]: Without dead ends: 3007 [2021-05-06 11:21:41,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 199.5ms TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:41,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3007 states. [2021-05-06 11:21:42,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3007 to 1237. [2021-05-06 11:21:42,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1232 states have (on average 1.1436688311688312) internal successors, (1409), 1232 states have internal predecessors, (1409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:42,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1413 transitions. [2021-05-06 11:21:42,109 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1413 transitions. Word has length 78 [2021-05-06 11:21:42,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:42,109 INFO L480 AbstractCegarLoop]: Abstraction has 1237 states and 1413 transitions. [2021-05-06 11:21:42,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:42,109 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1413 transitions. [2021-05-06 11:21:42,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 11:21:42,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:42,110 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:42,110 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:21:42,110 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:42,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:42,111 INFO L82 PathProgramCache]: Analyzing trace with hash -588794316, now seen corresponding path program 5 times [2021-05-06 11:21:42,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:42,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333731689] [2021-05-06 11:21:42,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:42,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:42,114 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:42,115 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:42,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:42,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:42,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:42,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:42,368 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:42,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333731689] [2021-05-06 11:21:42,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333731689] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:42,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:42,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:21:42,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394081403] [2021-05-06 11:21:42,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:21:42,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:42,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:21:42,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:21:42,369 INFO L87 Difference]: Start difference. First operand 1237 states and 1413 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 19 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:47,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:47,501 INFO L93 Difference]: Finished difference Result 7055 states and 8170 transitions. [2021-05-06 11:21:47,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:21:47,502 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 19 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-05-06 11:21:47,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:47,536 INFO L225 Difference]: With dead ends: 7055 [2021-05-06 11:21:47,536 INFO L226 Difference]: Without dead ends: 7011 [2021-05-06 11:21:47,538 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 217.7ms TimeCoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:21:47,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7011 states. [2021-05-06 11:21:48,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7011 to 1241. [2021-05-06 11:21:48,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1241 states, 1236 states have (on average 1.1448220064724919) internal successors, (1415), 1236 states have internal predecessors, (1415), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:48,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1241 states to 1241 states and 1419 transitions. [2021-05-06 11:21:48,431 INFO L78 Accepts]: Start accepts. Automaton has 1241 states and 1419 transitions. Word has length 78 [2021-05-06 11:21:48,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:48,432 INFO L480 AbstractCegarLoop]: Abstraction has 1241 states and 1419 transitions. [2021-05-06 11:21:48,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 19 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:48,432 INFO L276 IsEmpty]: Start isEmpty. Operand 1241 states and 1419 transitions. [2021-05-06 11:21:48,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:21:48,433 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:48,433 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:48,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:21:48,433 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:48,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:48,434 INFO L82 PathProgramCache]: Analyzing trace with hash -2010210048, now seen corresponding path program 20 times [2021-05-06 11:21:48,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:48,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995003882] [2021-05-06 11:21:48,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:48,438 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:48,438 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:48,439 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:48,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:48,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:48,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:48,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:48,670 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:48,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995003882] [2021-05-06 11:21:48,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1995003882] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:48,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:48,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:21:48,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170467732] [2021-05-06 11:21:48,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:21:48,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:48,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:21:48,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:48,671 INFO L87 Difference]: Start difference. First operand 1241 states and 1419 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:52,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:52,523 INFO L93 Difference]: Finished difference Result 4996 states and 5750 transitions. [2021-05-06 11:21:52,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:21:52,523 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-06 11:21:52,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:52,529 INFO L225 Difference]: With dead ends: 4996 [2021-05-06 11:21:52,529 INFO L226 Difference]: Without dead ends: 4947 [2021-05-06 11:21:52,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 195.5ms TimeCoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:52,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4947 states. [2021-05-06 11:21:53,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4947 to 1241. [2021-05-06 11:21:53,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1241 states, 1236 states have (on average 1.1448220064724919) internal successors, (1415), 1236 states have internal predecessors, (1415), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:53,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1241 states to 1241 states and 1419 transitions. [2021-05-06 11:21:53,190 INFO L78 Accepts]: Start accepts. Automaton has 1241 states and 1419 transitions. Word has length 79 [2021-05-06 11:21:53,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:53,190 INFO L480 AbstractCegarLoop]: Abstraction has 1241 states and 1419 transitions. [2021-05-06 11:21:53,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:53,190 INFO L276 IsEmpty]: Start isEmpty. Operand 1241 states and 1419 transitions. [2021-05-06 11:21:53,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:21:53,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:53,191 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 3, 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] [2021-05-06 11:21:53,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:21:53,191 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:53,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:53,192 INFO L82 PathProgramCache]: Analyzing trace with hash -65468578, now seen corresponding path program 21 times [2021-05-06 11:21:53,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:53,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700795862] [2021-05-06 11:21:53,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:53,195 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:53,195 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:53,195 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:53,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:53,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:53,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:53,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:53,342 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:53,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700795862] [2021-05-06 11:21:53,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1700795862] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:53,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:53,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:21:53,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11290051] [2021-05-06 11:21:53,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:21:53,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:53,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:21:53,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:53,343 INFO L87 Difference]: Start difference. First operand 1241 states and 1419 transitions. Second operand has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:56,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:56,160 INFO L93 Difference]: Finished difference Result 3594 states and 4116 transitions. [2021-05-06 11:21:56,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:21:56,161 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:21:56,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:56,164 INFO L225 Difference]: With dead ends: 3594 [2021-05-06 11:21:56,164 INFO L226 Difference]: Without dead ends: 3485 [2021-05-06 11:21:56,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 169.2ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:56,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3485 states. [2021-05-06 11:21:56,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3485 to 1241. [2021-05-06 11:21:56,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1241 states, 1236 states have (on average 1.1448220064724919) internal successors, (1415), 1236 states have internal predecessors, (1415), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:56,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1241 states to 1241 states and 1419 transitions. [2021-05-06 11:21:56,853 INFO L78 Accepts]: Start accepts. Automaton has 1241 states and 1419 transitions. Word has length 80 [2021-05-06 11:21:56,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:56,853 INFO L480 AbstractCegarLoop]: Abstraction has 1241 states and 1419 transitions. [2021-05-06 11:21:56,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:56,853 INFO L276 IsEmpty]: Start isEmpty. Operand 1241 states and 1419 transitions. [2021-05-06 11:21:56,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:21:56,855 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:56,855 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:56,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:21:56,855 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:56,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:56,855 INFO L82 PathProgramCache]: Analyzing trace with hash 598040280, now seen corresponding path program 22 times [2021-05-06 11:21:56,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:56,855 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073297777] [2021-05-06 11:21:56,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:56,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:56,859 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:56,859 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:56,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:56,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:56,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:56,950 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:56,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073297777] [2021-05-06 11:21:56,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1073297777] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:56,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:56,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:21:56,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067340011] [2021-05-06 11:21:56,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:21:56,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:56,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:21:56,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:56,951 INFO L87 Difference]: Start difference. First operand 1241 states and 1419 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:57,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:57,663 INFO L93 Difference]: Finished difference Result 1469 states and 1667 transitions. [2021-05-06 11:21:57,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:21:57,663 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 11:21:57,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:57,664 INFO L225 Difference]: With dead ends: 1469 [2021-05-06 11:21:57,664 INFO L226 Difference]: Without dead ends: 815 [2021-05-06 11:21:57,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 68.7ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:57,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 815 states. [2021-05-06 11:21:58,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 815 to 730. [2021-05-06 11:21:58,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 730 states, 725 states have (on average 1.1517241379310346) internal successors, (835), 725 states have internal predecessors, (835), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:58,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 730 states to 730 states and 839 transitions. [2021-05-06 11:21:58,128 INFO L78 Accepts]: Start accepts. Automaton has 730 states and 839 transitions. Word has length 81 [2021-05-06 11:21:58,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:58,129 INFO L480 AbstractCegarLoop]: Abstraction has 730 states and 839 transitions. [2021-05-06 11:21:58,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:58,129 INFO L276 IsEmpty]: Start isEmpty. Operand 730 states and 839 transitions. [2021-05-06 11:21:58,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:21:58,129 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:58,130 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:58,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:21:58,130 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:58,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:58,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1331008261, now seen corresponding path program 23 times [2021-05-06 11:21:58,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:58,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025452590] [2021-05-06 11:21:58,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:58,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:58,133 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:58,134 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:58,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:58,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:58,335 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:58,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025452590] [2021-05-06 11:21:58,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1025452590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:58,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:58,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:21:58,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973836482] [2021-05-06 11:21:58,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:21:58,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:58,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:21:58,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:21:58,336 INFO L87 Difference]: Start difference. First operand 730 states and 839 transitions. Second operand has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:02,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:02,854 INFO L93 Difference]: Finished difference Result 4887 states and 5636 transitions. [2021-05-06 11:22:02,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:22:02,855 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 11:22:02,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:02,859 INFO L225 Difference]: With dead ends: 4887 [2021-05-06 11:22:02,859 INFO L226 Difference]: Without dead ends: 4838 [2021-05-06 11:22:02,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 206.3ms TimeCoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:22:02,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4838 states. [2021-05-06 11:22:03,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4838 to 730. [2021-05-06 11:22:03,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 730 states, 725 states have (on average 1.1517241379310346) internal successors, (835), 725 states have internal predecessors, (835), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:03,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 730 states to 730 states and 839 transitions. [2021-05-06 11:22:03,370 INFO L78 Accepts]: Start accepts. Automaton has 730 states and 839 transitions. Word has length 81 [2021-05-06 11:22:03,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:03,370 INFO L480 AbstractCegarLoop]: Abstraction has 730 states and 839 transitions. [2021-05-06 11:22:03,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:03,370 INFO L276 IsEmpty]: Start isEmpty. Operand 730 states and 839 transitions. [2021-05-06 11:22:03,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:22:03,371 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:03,371 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:03,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:22:03,371 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:03,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:03,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1790824352, now seen corresponding path program 24 times [2021-05-06 11:22:03,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:03,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291547496] [2021-05-06 11:22:03,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:03,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:03,375 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:03,375 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:03,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:04,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:04,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:04,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:04,166 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:04,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291547496] [2021-05-06 11:22:04,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1291547496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:04,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:04,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:22:04,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322172012] [2021-05-06 11:22:04,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:22:04,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:04,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:22:04,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:22:04,167 INFO L87 Difference]: Start difference. First operand 730 states and 839 transitions. Second operand has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:05,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:05,193 INFO L93 Difference]: Finished difference Result 805 states and 918 transitions. [2021-05-06 11:22:05,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:22:05,193 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 11:22:05,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:05,194 INFO L225 Difference]: With dead ends: 805 [2021-05-06 11:22:05,194 INFO L226 Difference]: Without dead ends: 600 [2021-05-06 11:22:05,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 904.2ms TimeCoverageRelationStatistics Valid=149, Invalid=501, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:22:05,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2021-05-06 11:22:05,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 600. [2021-05-06 11:22:05,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 595 states have (on average 1.169747899159664) internal successors, (696), 595 states have internal predecessors, (696), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:05,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 700 transitions. [2021-05-06 11:22:05,625 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 700 transitions. Word has length 82 [2021-05-06 11:22:05,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:05,625 INFO L480 AbstractCegarLoop]: Abstraction has 600 states and 700 transitions. [2021-05-06 11:22:05,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 17 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:05,625 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 700 transitions. [2021-05-06 11:22:05,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:22:05,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:05,626 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 4, 4, 3, 3, 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] [2021-05-06 11:22:05,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:22:05,626 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:05,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:05,627 INFO L82 PathProgramCache]: Analyzing trace with hash 433083897, now seen corresponding path program 25 times [2021-05-06 11:22:05,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:05,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981715672] [2021-05-06 11:22:05,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:05,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:05,630 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:05,631 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:05,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:05,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:05,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:05,913 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:05,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981715672] [2021-05-06 11:22:05,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [981715672] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:05,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:05,913 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:22:05,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526538189] [2021-05-06 11:22:05,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:22:05,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:05,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:22:05,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:22:05,914 INFO L87 Difference]: Start difference. First operand 600 states and 700 transitions. Second operand has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:09,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:09,192 INFO L93 Difference]: Finished difference Result 3246 states and 3741 transitions. [2021-05-06 11:22:09,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:22:09,192 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 11:22:09,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:09,213 INFO L225 Difference]: With dead ends: 3246 [2021-05-06 11:22:09,213 INFO L226 Difference]: Without dead ends: 3137 [2021-05-06 11:22:09,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 286.5ms TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:22:09,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3137 states. [2021-05-06 11:22:09,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3137 to 600. [2021-05-06 11:22:09,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 595 states have (on average 1.169747899159664) internal successors, (696), 595 states have internal predecessors, (696), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:09,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 700 transitions. [2021-05-06 11:22:09,685 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 700 transitions. Word has length 82 [2021-05-06 11:22:09,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:09,686 INFO L480 AbstractCegarLoop]: Abstraction has 600 states and 700 transitions. [2021-05-06 11:22:09,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:09,686 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 700 transitions. [2021-05-06 11:22:09,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-06 11:22:09,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:09,687 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:09,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:22:09,687 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:09,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:09,687 INFO L82 PathProgramCache]: Analyzing trace with hash -813744598, now seen corresponding path program 6 times [2021-05-06 11:22:09,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:09,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50144822] [2021-05-06 11:22:09,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:09,691 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:09,691 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:09,702 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:09,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:10,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:10,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:10,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:10,066 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:10,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50144822] [2021-05-06 11:22:10,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [50144822] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:10,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:10,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:22:10,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439510985] [2021-05-06 11:22:10,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:22:10,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:10,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:22:10,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:22:10,067 INFO L87 Difference]: Start difference. First operand 600 states and 700 transitions. Second operand has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 20 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:16,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:16,836 INFO L93 Difference]: Finished difference Result 6784 states and 7877 transitions. [2021-05-06 11:22:16,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:22:16,836 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 20 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-05-06 11:22:16,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:16,842 INFO L225 Difference]: With dead ends: 6784 [2021-05-06 11:22:16,842 INFO L226 Difference]: Without dead ends: 6740 [2021-05-06 11:22:16,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 254.6ms TimeCoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:22:16,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6740 states. [2021-05-06 11:22:17,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6740 to 602. [2021-05-06 11:22:17,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 597 states have (on average 1.170854271356784) internal successors, (699), 597 states have internal predecessors, (699), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:17,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 703 transitions. [2021-05-06 11:22:17,370 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 703 transitions. Word has length 82 [2021-05-06 11:22:17,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:17,370 INFO L480 AbstractCegarLoop]: Abstraction has 602 states and 703 transitions. [2021-05-06 11:22:17,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.7142857142857144) internal successors, (57), 20 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:17,370 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 703 transitions. [2021-05-06 11:22:17,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:22:17,371 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:17,371 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:17,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:22:17,371 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:17,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:17,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1126702179, now seen corresponding path program 26 times [2021-05-06 11:22:17,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:17,372 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438448897] [2021-05-06 11:22:17,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:17,381 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:17,381 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:17,382 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:17,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:18,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:18,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:18,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:18,708 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:18,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438448897] [2021-05-06 11:22:18,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [438448897] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:18,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:18,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:22:18,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228806073] [2021-05-06 11:22:18,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:22:18,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:18,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:22:18,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:22:18,710 INFO L87 Difference]: Start difference. First operand 602 states and 703 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:21,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:21,341 INFO L93 Difference]: Finished difference Result 1424 states and 1655 transitions. [2021-05-06 11:22:21,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:22:21,341 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:22:21,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:21,343 INFO L225 Difference]: With dead ends: 1424 [2021-05-06 11:22:21,343 INFO L226 Difference]: Without dead ends: 1419 [2021-05-06 11:22:21,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1797.4ms TimeCoverageRelationStatistics Valid=270, Invalid=1800, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:22:21,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1419 states. [2021-05-06 11:22:21,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1419 to 754. [2021-05-06 11:22:21,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 749 states have (on average 1.1682242990654206) internal successors, (875), 749 states have internal predecessors, (875), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:21,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 879 transitions. [2021-05-06 11:22:21,973 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 879 transitions. Word has length 83 [2021-05-06 11:22:21,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:21,973 INFO L480 AbstractCegarLoop]: Abstraction has 754 states and 879 transitions. [2021-05-06 11:22:21,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:21,973 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 879 transitions. [2021-05-06 11:22:21,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:22:21,974 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:21,974 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:21,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:22:21,974 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:21,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:21,974 INFO L82 PathProgramCache]: Analyzing trace with hash 2049500001, now seen corresponding path program 27 times [2021-05-06 11:22:21,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:21,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949185535] [2021-05-06 11:22:21,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:21,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:21,978 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:21,978 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:22,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:22,625 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 49 [2021-05-06 11:22:23,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:23,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:23,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:23,214 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:23,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949185535] [2021-05-06 11:22:23,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [949185535] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:23,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:23,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:22:23,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244961141] [2021-05-06 11:22:23,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:22:23,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:23,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:22:23,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:22:23,215 INFO L87 Difference]: Start difference. First operand 754 states and 879 transitions. Second operand has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:26,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:26,694 INFO L93 Difference]: Finished difference Result 2121 states and 2460 transitions. [2021-05-06 11:22:26,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:22:26,694 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:22:26,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:26,696 INFO L225 Difference]: With dead ends: 2121 [2021-05-06 11:22:26,696 INFO L226 Difference]: Without dead ends: 1812 [2021-05-06 11:22:26,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 2082.0ms TimeCoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:22:26,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1812 states. [2021-05-06 11:22:27,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1812 to 971. [2021-05-06 11:22:27,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 971 states, 966 states have (on average 1.1625258799171843) internal successors, (1123), 966 states have internal predecessors, (1123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:27,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 971 states to 971 states and 1127 transitions. [2021-05-06 11:22:27,583 INFO L78 Accepts]: Start accepts. Automaton has 971 states and 1127 transitions. Word has length 83 [2021-05-06 11:22:27,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:27,583 INFO L480 AbstractCegarLoop]: Abstraction has 971 states and 1127 transitions. [2021-05-06 11:22:27,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:27,583 INFO L276 IsEmpty]: Start isEmpty. Operand 971 states and 1127 transitions. [2021-05-06 11:22:27,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:22:27,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:27,584 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:27,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:22:27,585 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:27,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:27,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1737453601, now seen corresponding path program 28 times [2021-05-06 11:22:27,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:27,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780422661] [2021-05-06 11:22:27,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:27,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:27,588 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:27,589 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:27,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:27,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:27,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:27,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:27,865 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:27,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780422661] [2021-05-06 11:22:27,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1780422661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:27,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:27,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:22:27,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413958641] [2021-05-06 11:22:27,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:22:27,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:27,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:22:27,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:22:27,866 INFO L87 Difference]: Start difference. First operand 971 states and 1127 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:29,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:29,340 INFO L93 Difference]: Finished difference Result 1320 states and 1521 transitions. [2021-05-06 11:22:29,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:22:29,340 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:22:29,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:29,342 INFO L225 Difference]: With dead ends: 1320 [2021-05-06 11:22:29,342 INFO L226 Difference]: Without dead ends: 1315 [2021-05-06 11:22:29,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 223.7ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:22:29,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-05-06 11:22:30,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 864. [2021-05-06 11:22:30,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 864 states, 859 states have (on average 1.1711292200232828) internal successors, (1006), 859 states have internal predecessors, (1006), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:30,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 864 states to 864 states and 1010 transitions. [2021-05-06 11:22:30,157 INFO L78 Accepts]: Start accepts. Automaton has 864 states and 1010 transitions. Word has length 83 [2021-05-06 11:22:30,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:30,157 INFO L480 AbstractCegarLoop]: Abstraction has 864 states and 1010 transitions. [2021-05-06 11:22:30,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:30,157 INFO L276 IsEmpty]: Start isEmpty. Operand 864 states and 1010 transitions. [2021-05-06 11:22:30,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:22:30,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:30,158 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:30,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:22:30,158 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:30,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:30,159 INFO L82 PathProgramCache]: Analyzing trace with hash 162728781, now seen corresponding path program 29 times [2021-05-06 11:22:30,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:30,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240796159] [2021-05-06 11:22:30,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:30,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:30,162 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:30,162 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:30,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:30,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:30,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:30,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:30,309 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:30,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240796159] [2021-05-06 11:22:30,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1240796159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:30,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:30,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:22:30,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695914301] [2021-05-06 11:22:30,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:22:30,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:30,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:22:30,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:22:30,310 INFO L87 Difference]: Start difference. First operand 864 states and 1010 transitions. Second operand has 13 states, 13 states have (on average 5.076923076923077) internal successors, (66), 11 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:32,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:32,047 INFO L93 Difference]: Finished difference Result 1341 states and 1551 transitions. [2021-05-06 11:22:32,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:22:32,047 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 5.076923076923077) internal successors, (66), 11 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:22:32,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:32,049 INFO L225 Difference]: With dead ends: 1341 [2021-05-06 11:22:32,049 INFO L226 Difference]: Without dead ends: 1336 [2021-05-06 11:22:32,049 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 228.6ms TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:22:32,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1336 states. [2021-05-06 11:22:33,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1336 to 1063. [2021-05-06 11:22:33,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1063 states, 1058 states have (on average 1.166351606805293) internal successors, (1234), 1058 states have internal predecessors, (1234), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:33,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1063 states to 1063 states and 1238 transitions. [2021-05-06 11:22:33,172 INFO L78 Accepts]: Start accepts. Automaton has 1063 states and 1238 transitions. Word has length 93 [2021-05-06 11:22:33,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:33,173 INFO L480 AbstractCegarLoop]: Abstraction has 1063 states and 1238 transitions. [2021-05-06 11:22:33,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 5.076923076923077) internal successors, (66), 11 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:33,173 INFO L276 IsEmpty]: Start isEmpty. Operand 1063 states and 1238 transitions. [2021-05-06 11:22:33,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:22:33,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:33,174 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:33,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:22:33,174 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:33,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:33,174 INFO L82 PathProgramCache]: Analyzing trace with hash -424077233, now seen corresponding path program 30 times [2021-05-06 11:22:33,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:33,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363345248] [2021-05-06 11:22:33,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:33,178 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:33,178 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:33,178 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:33,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:34,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:34,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:34,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:34,422 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:34,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363345248] [2021-05-06 11:22:34,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1363345248] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:34,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:34,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:22:34,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262262947] [2021-05-06 11:22:34,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:22:34,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:34,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:22:34,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:22:34,422 INFO L87 Difference]: Start difference. First operand 1063 states and 1238 transitions. Second operand has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:38,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:38,096 INFO L93 Difference]: Finished difference Result 2750 states and 3169 transitions. [2021-05-06 11:22:38,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:22:38,097 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:22:38,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:38,099 INFO L225 Difference]: With dead ends: 2750 [2021-05-06 11:22:38,099 INFO L226 Difference]: Without dead ends: 2277 [2021-05-06 11:22:38,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1325.8ms TimeCoverageRelationStatistics Valid=213, Invalid=909, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:22:38,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2277 states. [2021-05-06 11:22:39,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2277 to 1432. [2021-05-06 11:22:39,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1432 states, 1427 states have (on average 1.1408549404344779) internal successors, (1628), 1427 states have internal predecessors, (1628), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:39,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1432 states to 1432 states and 1632 transitions. [2021-05-06 11:22:39,791 INFO L78 Accepts]: Start accepts. Automaton has 1432 states and 1632 transitions. Word has length 93 [2021-05-06 11:22:39,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:39,791 INFO L480 AbstractCegarLoop]: Abstraction has 1432 states and 1632 transitions. [2021-05-06 11:22:39,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:39,791 INFO L276 IsEmpty]: Start isEmpty. Operand 1432 states and 1632 transitions. [2021-05-06 11:22:39,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:22:39,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:39,792 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:39,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:22:39,793 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:39,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:39,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1642709553, now seen corresponding path program 31 times [2021-05-06 11:22:39,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:39,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968327024] [2021-05-06 11:22:39,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:39,796 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:39,796 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:39,797 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:39,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:40,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:40,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:40,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:40,790 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:40,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968327024] [2021-05-06 11:22:40,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [968327024] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:40,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:40,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:22:40,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467708805] [2021-05-06 11:22:40,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:22:40,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:40,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:22:40,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:22:40,791 INFO L87 Difference]: Start difference. First operand 1432 states and 1632 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:44,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:44,641 INFO L93 Difference]: Finished difference Result 2673 states and 3048 transitions. [2021-05-06 11:22:44,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:22:44,641 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:22:44,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:44,643 INFO L225 Difference]: With dead ends: 2673 [2021-05-06 11:22:44,643 INFO L226 Difference]: Without dead ends: 2537 [2021-05-06 11:22:44,644 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1018.1ms TimeCoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:22:44,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2537 states. [2021-05-06 11:22:46,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2537 to 1797. [2021-05-06 11:22:46,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1797 states, 1792 states have (on average 1.13671875) internal successors, (2037), 1792 states have internal predecessors, (2037), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:46,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1797 states to 1797 states and 2041 transitions. [2021-05-06 11:22:46,724 INFO L78 Accepts]: Start accepts. Automaton has 1797 states and 2041 transitions. Word has length 93 [2021-05-06 11:22:46,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:46,724 INFO L480 AbstractCegarLoop]: Abstraction has 1797 states and 2041 transitions. [2021-05-06 11:22:46,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:46,724 INFO L276 IsEmpty]: Start isEmpty. Operand 1797 states and 2041 transitions. [2021-05-06 11:22:46,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:22:46,726 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:46,726 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:46,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:22:46,726 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:46,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:46,726 INFO L82 PathProgramCache]: Analyzing trace with hash 221262611, now seen corresponding path program 32 times [2021-05-06 11:22:46,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:46,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257814896] [2021-05-06 11:22:46,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:46,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:46,731 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:46,731 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:46,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:47,276 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 42 [2021-05-06 11:22:48,216 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 63 [2021-05-06 11:22:48,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:48,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:48,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:48,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257814896] [2021-05-06 11:22:48,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [257814896] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:48,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:48,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:22:48,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802943437] [2021-05-06 11:22:48,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:22:48,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:48,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:22:48,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:22:48,329 INFO L87 Difference]: Start difference. First operand 1797 states and 2041 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:53,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:53,586 INFO L93 Difference]: Finished difference Result 3023 states and 3423 transitions. [2021-05-06 11:22:53,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:22:53,587 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:22:53,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:53,589 INFO L225 Difference]: With dead ends: 3023 [2021-05-06 11:22:53,589 INFO L226 Difference]: Without dead ends: 2944 [2021-05-06 11:22:53,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1982.6ms TimeCoverageRelationStatistics Valid=271, Invalid=1289, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:22:53,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2944 states. [2021-05-06 11:22:56,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2944 to 2084. [2021-05-06 11:22:56,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2084 states, 2079 states have (on average 1.1216931216931216) internal successors, (2332), 2079 states have internal predecessors, (2332), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:56,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2084 states to 2084 states and 2336 transitions. [2021-05-06 11:22:56,294 INFO L78 Accepts]: Start accepts. Automaton has 2084 states and 2336 transitions. Word has length 93 [2021-05-06 11:22:56,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:56,294 INFO L480 AbstractCegarLoop]: Abstraction has 2084 states and 2336 transitions. [2021-05-06 11:22:56,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:56,294 INFO L276 IsEmpty]: Start isEmpty. Operand 2084 states and 2336 transitions. [2021-05-06 11:22:56,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:22:56,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:56,296 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:56,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:22:56,296 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:56,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:56,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1056215119, now seen corresponding path program 33 times [2021-05-06 11:22:56,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:56,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337327266] [2021-05-06 11:22:56,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:56,300 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:56,300 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:56,301 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:56,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:57,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:57,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:57,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:57,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:57,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337327266] [2021-05-06 11:22:57,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [337327266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:57,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:57,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:22:57,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982472942] [2021-05-06 11:22:57,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:22:57,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:57,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:22:57,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:22:57,582 INFO L87 Difference]: Start difference. First operand 2084 states and 2336 transitions. Second operand has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:02,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:02,627 INFO L93 Difference]: Finished difference Result 3491 states and 3964 transitions. [2021-05-06 11:23:02,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:23:02,627 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:23:02,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:02,630 INFO L225 Difference]: With dead ends: 3491 [2021-05-06 11:23:02,630 INFO L226 Difference]: Without dead ends: 2845 [2021-05-06 11:23:02,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1402.3ms TimeCoverageRelationStatistics Valid=211, Invalid=911, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:23:02,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2845 states. [2021-05-06 11:23:06,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2845 to 2591. [2021-05-06 11:23:06,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2591 states, 2586 states have (on average 1.1156225831399846) internal successors, (2885), 2586 states have internal predecessors, (2885), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:06,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2591 states to 2591 states and 2889 transitions. [2021-05-06 11:23:06,115 INFO L78 Accepts]: Start accepts. Automaton has 2591 states and 2889 transitions. Word has length 93 [2021-05-06 11:23:06,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:06,115 INFO L480 AbstractCegarLoop]: Abstraction has 2591 states and 2889 transitions. [2021-05-06 11:23:06,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:06,115 INFO L276 IsEmpty]: Start isEmpty. Operand 2591 states and 2889 transitions. [2021-05-06 11:23:06,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:23:06,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:06,118 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:06,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:23:06,118 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:06,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:06,118 INFO L82 PathProgramCache]: Analyzing trace with hash 862436115, now seen corresponding path program 34 times [2021-05-06 11:23:06,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:06,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17149539] [2021-05-06 11:23:06,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:06,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:06,122 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:06,128 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:06,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:07,657 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 60 [2021-05-06 11:23:07,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:07,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:07,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:07,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:07,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17149539] [2021-05-06 11:23:07,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [17149539] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:07,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:07,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:23:07,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144147873] [2021-05-06 11:23:07,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:23:07,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:07,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:23:07,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:23:07,769 INFO L87 Difference]: Start difference. First operand 2591 states and 2889 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:11,984 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 52 [2021-05-06 11:23:12,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:12,915 INFO L93 Difference]: Finished difference Result 2926 states and 3278 transitions. [2021-05-06 11:23:12,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:23:12,915 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:23:12,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:12,918 INFO L225 Difference]: With dead ends: 2926 [2021-05-06 11:23:12,918 INFO L226 Difference]: Without dead ends: 2872 [2021-05-06 11:23:12,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 1948.7ms TimeCoverageRelationStatistics Valid=272, Invalid=1288, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:23:12,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2872 states. [2021-05-06 11:23:16,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2872 to 2594. [2021-05-06 11:23:16,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2594 states, 2589 states have (on average 1.115488605639243) internal successors, (2888), 2589 states have internal predecessors, (2888), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:16,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2594 states to 2594 states and 2892 transitions. [2021-05-06 11:23:16,383 INFO L78 Accepts]: Start accepts. Automaton has 2594 states and 2892 transitions. Word has length 93 [2021-05-06 11:23:16,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:16,383 INFO L480 AbstractCegarLoop]: Abstraction has 2594 states and 2892 transitions. [2021-05-06 11:23:16,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:16,383 INFO L276 IsEmpty]: Start isEmpty. Operand 2594 states and 2892 transitions. [2021-05-06 11:23:16,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:23:16,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:16,386 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:16,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:23:16,386 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:16,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:16,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1038747787, now seen corresponding path program 35 times [2021-05-06 11:23:16,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:16,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848467513] [2021-05-06 11:23:16,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:16,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:16,389 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:16,390 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:16,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:17,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:17,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:17,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:17,200 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:17,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848467513] [2021-05-06 11:23:17,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1848467513] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:17,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:17,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:23:17,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969131408] [2021-05-06 11:23:17,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:23:17,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:17,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:23:17,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:23:17,201 INFO L87 Difference]: Start difference. First operand 2594 states and 2892 transitions. Second operand has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:21,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:21,745 INFO L93 Difference]: Finished difference Result 2979 states and 3312 transitions. [2021-05-06 11:23:21,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:23:21,746 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:23:21,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:21,749 INFO L225 Difference]: With dead ends: 2979 [2021-05-06 11:23:21,749 INFO L226 Difference]: Without dead ends: 2813 [2021-05-06 11:23:21,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 911.2ms TimeCoverageRelationStatistics Valid=194, Invalid=736, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:23:21,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2813 states. [2021-05-06 11:23:25,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2813 to 2594. [2021-05-06 11:23:25,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2594 states, 2589 states have (on average 1.1104673619157976) internal successors, (2875), 2589 states have internal predecessors, (2875), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:25,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2594 states to 2594 states and 2879 transitions. [2021-05-06 11:23:25,248 INFO L78 Accepts]: Start accepts. Automaton has 2594 states and 2879 transitions. Word has length 93 [2021-05-06 11:23:25,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:25,248 INFO L480 AbstractCegarLoop]: Abstraction has 2594 states and 2879 transitions. [2021-05-06 11:23:25,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.142857142857143) internal successors, (66), 20 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:25,248 INFO L276 IsEmpty]: Start isEmpty. Operand 2594 states and 2879 transitions. [2021-05-06 11:23:25,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:23:25,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:25,251 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:25,251 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:23:25,251 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:25,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:25,251 INFO L82 PathProgramCache]: Analyzing trace with hash 50957903, now seen corresponding path program 36 times [2021-05-06 11:23:25,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:25,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631217330] [2021-05-06 11:23:25,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:25,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:25,262 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:25,267 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:26,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:26,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:26,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:26,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:26,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631217330] [2021-05-06 11:23:26,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1631217330] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:26,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:26,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:23:26,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289288150] [2021-05-06 11:23:26,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:23:26,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:26,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:23:26,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:23:26,583 INFO L87 Difference]: Start difference. First operand 2594 states and 2879 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:30,268 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 51 [2021-05-06 11:23:32,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:32,706 INFO L93 Difference]: Finished difference Result 3344 states and 3726 transitions. [2021-05-06 11:23:32,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:23:32,706 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:23:32,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:32,709 INFO L225 Difference]: With dead ends: 3344 [2021-05-06 11:23:32,709 INFO L226 Difference]: Without dead ends: 3208 [2021-05-06 11:23:32,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 9 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1822.8ms TimeCoverageRelationStatistics Valid=353, Invalid=1627, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:23:32,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3208 states. [2021-05-06 11:23:36,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3208 to 2560. [2021-05-06 11:23:36,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2560 states, 2555 states have (on average 1.106849315068493) internal successors, (2828), 2555 states have internal predecessors, (2828), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:36,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2560 states to 2560 states and 2832 transitions. [2021-05-06 11:23:36,211 INFO L78 Accepts]: Start accepts. Automaton has 2560 states and 2832 transitions. Word has length 93 [2021-05-06 11:23:36,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:36,212 INFO L480 AbstractCegarLoop]: Abstraction has 2560 states and 2832 transitions. [2021-05-06 11:23:36,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:36,212 INFO L276 IsEmpty]: Start isEmpty. Operand 2560 states and 2832 transitions. [2021-05-06 11:23:36,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:23:36,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:36,214 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:23:36,214 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:23:36,214 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:36,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:36,214 INFO L82 PathProgramCache]: Analyzing trace with hash -102388934, now seen corresponding path program 37 times [2021-05-06 11:23:36,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:36,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261672131] [2021-05-06 11:23:36,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:36,218 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:36,218 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:36,218 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:36,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:36,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:36,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:36,444 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:36,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261672131] [2021-05-06 11:23:36,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [261672131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:36,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:36,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:23:36,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970686482] [2021-05-06 11:23:36,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:23:36,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:36,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:23:36,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:23:36,445 INFO L87 Difference]: Start difference. First operand 2560 states and 2832 transitions. Second operand has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:49,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:49,261 INFO L93 Difference]: Finished difference Result 8596 states and 9790 transitions. [2021-05-06 11:23:49,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:23:49,262 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:23:49,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:49,268 INFO L225 Difference]: With dead ends: 8596 [2021-05-06 11:23:49,268 INFO L226 Difference]: Without dead ends: 8529 [2021-05-06 11:23:49,269 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 230.0ms TimeCoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:23:49,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8529 states. [2021-05-06 11:23:52,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8529 to 2560. [2021-05-06 11:23:52,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2560 states, 2555 states have (on average 1.106849315068493) internal successors, (2828), 2555 states have internal predecessors, (2828), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:52,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2560 states to 2560 states and 2832 transitions. [2021-05-06 11:23:52,791 INFO L78 Accepts]: Start accepts. Automaton has 2560 states and 2832 transitions. Word has length 93 [2021-05-06 11:23:52,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:52,791 INFO L480 AbstractCegarLoop]: Abstraction has 2560 states and 2832 transitions. [2021-05-06 11:23:52,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:52,791 INFO L276 IsEmpty]: Start isEmpty. Operand 2560 states and 2832 transitions. [2021-05-06 11:23:52,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:23:52,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:52,793 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:52,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 11:23:52,794 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:52,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:52,794 INFO L82 PathProgramCache]: Analyzing trace with hash -291944894, now seen corresponding path program 38 times [2021-05-06 11:23:52,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:52,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981192137] [2021-05-06 11:23:52,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:52,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:52,797 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:52,798 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:52,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:52,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:52,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:52,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:52,976 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:52,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981192137] [2021-05-06 11:23:52,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1981192137] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:52,976 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:52,976 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:23:52,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265132570] [2021-05-06 11:23:52,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:23:52,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:52,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:23:52,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:23:52,977 INFO L87 Difference]: Start difference. First operand 2560 states and 2832 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:02,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:02,342 INFO L93 Difference]: Finished difference Result 6318 states and 7149 transitions. [2021-05-06 11:24:02,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:24:02,343 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-06 11:24:02,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:02,347 INFO L225 Difference]: With dead ends: 6318 [2021-05-06 11:24:02,347 INFO L226 Difference]: Without dead ends: 6171 [2021-05-06 11:24:02,348 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 203.0ms TimeCoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:24:02,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6171 states. [2021-05-06 11:24:05,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6171 to 2560. [2021-05-06 11:24:05,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2560 states, 2555 states have (on average 1.106849315068493) internal successors, (2828), 2555 states have internal predecessors, (2828), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:05,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2560 states to 2560 states and 2832 transitions. [2021-05-06 11:24:05,945 INFO L78 Accepts]: Start accepts. Automaton has 2560 states and 2832 transitions. Word has length 94 [2021-05-06 11:24:05,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:05,972 INFO L480 AbstractCegarLoop]: Abstraction has 2560 states and 2832 transitions. [2021-05-06 11:24:05,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 14 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:05,973 INFO L276 IsEmpty]: Start isEmpty. Operand 2560 states and 2832 transitions. [2021-05-06 11:24:05,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:24:05,975 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:05,975 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:05,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:24:05,976 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:05,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:05,976 INFO L82 PathProgramCache]: Analyzing trace with hash 955226037, now seen corresponding path program 7 times [2021-05-06 11:24:05,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:05,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333587209] [2021-05-06 11:24:05,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:05,980 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:05,980 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:05,981 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:06,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:06,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:06,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:06,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:06,302 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:06,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333587209] [2021-05-06 11:24:06,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333587209] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:06,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:06,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:24:06,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761836525] [2021-05-06 11:24:06,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:24:06,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:06,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:24:06,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:24:06,303 INFO L87 Difference]: Start difference. First operand 2560 states and 2832 transitions. Second operand has 22 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 21 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:24,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:24,537 INFO L93 Difference]: Finished difference Result 11799 states and 13516 transitions. [2021-05-06 11:24:24,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:24:24,538 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 21 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-06 11:24:24,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:24,545 INFO L225 Difference]: With dead ends: 11799 [2021-05-06 11:24:24,546 INFO L226 Difference]: Without dead ends: 11732 [2021-05-06 11:24:24,546 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 253.2ms TimeCoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:24:24,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11732 states. [2021-05-06 11:24:28,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11732 to 2562. [2021-05-06 11:24:28,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2562 states, 2557 states have (on average 1.1071568244035979) internal successors, (2831), 2557 states have internal predecessors, (2831), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2562 states to 2562 states and 2835 transitions. [2021-05-06 11:24:28,172 INFO L78 Accepts]: Start accepts. Automaton has 2562 states and 2835 transitions. Word has length 94 [2021-05-06 11:24:28,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:28,172 INFO L480 AbstractCegarLoop]: Abstraction has 2562 states and 2835 transitions. [2021-05-06 11:24:28,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 21 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:28,172 INFO L276 IsEmpty]: Start isEmpty. Operand 2562 states and 2835 transitions. [2021-05-06 11:24:28,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:24:28,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:28,174 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:28,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:24:28,175 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:28,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:28,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1595514260, now seen corresponding path program 39 times [2021-05-06 11:24:28,175 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:28,175 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431477745] [2021-05-06 11:24:28,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:28,178 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:28,178 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:28,179 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:28,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:28,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:28,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:28,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:28,322 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:28,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431477745] [2021-05-06 11:24:28,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1431477745] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:28,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:28,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:24:28,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207347721] [2021-05-06 11:24:28,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:24:28,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:28,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:24:28,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:24:28,323 INFO L87 Difference]: Start difference. First operand 2562 states and 2835 transitions. Second operand has 12 states, 12 states have (on average 4.5) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:34,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:34,152 INFO L93 Difference]: Finished difference Result 4006 states and 4497 transitions. [2021-05-06 11:24:34,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:24:34,153 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.5) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:24:34,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:34,155 INFO L225 Difference]: With dead ends: 4006 [2021-05-06 11:24:34,155 INFO L226 Difference]: Without dead ends: 3776 [2021-05-06 11:24:34,156 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 164.4ms TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:24:34,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3776 states. [2021-05-06 11:24:37,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3776 to 2731. [2021-05-06 11:24:37,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2731 states, 2726 states have (on average 1.1100513573000734) internal successors, (3026), 2726 states have internal predecessors, (3026), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:37,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2731 states to 2731 states and 3030 transitions. [2021-05-06 11:24:37,942 INFO L78 Accepts]: Start accepts. Automaton has 2731 states and 3030 transitions. Word has length 95 [2021-05-06 11:24:37,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:37,942 INFO L480 AbstractCegarLoop]: Abstraction has 2731 states and 3030 transitions. [2021-05-06 11:24:37,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.5) internal successors, (54), 11 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:37,942 INFO L276 IsEmpty]: Start isEmpty. Operand 2731 states and 3030 transitions. [2021-05-06 11:24:37,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:24:37,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:37,945 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:24:37,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 11:24:37,945 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:37,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:37,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1917202559, now seen corresponding path program 40 times [2021-05-06 11:24:37,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:37,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865182922] [2021-05-06 11:24:37,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:37,958 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:37,958 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:37,959 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:37,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:38,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:38,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:38,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:38,177 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:38,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865182922] [2021-05-06 11:24:38,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1865182922] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:38,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:38,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:24:38,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887313894] [2021-05-06 11:24:38,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:24:38,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:38,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:24:38,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:24:38,178 INFO L87 Difference]: Start difference. First operand 2731 states and 3030 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:53,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:53,193 INFO L93 Difference]: Finished difference Result 9415 states and 10729 transitions. [2021-05-06 11:24:53,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:24:53,193 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:24:53,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:53,200 INFO L225 Difference]: With dead ends: 9415 [2021-05-06 11:24:53,200 INFO L226 Difference]: Without dead ends: 9348 [2021-05-06 11:24:53,201 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 225.5ms TimeCoverageRelationStatistics Valid=50, Invalid=412, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:24:53,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9348 states. [2021-05-06 11:24:57,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9348 to 2731. [2021-05-06 11:24:57,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2731 states, 2726 states have (on average 1.1100513573000734) internal successors, (3026), 2726 states have internal predecessors, (3026), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:57,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2731 states to 2731 states and 3030 transitions. [2021-05-06 11:24:57,044 INFO L78 Accepts]: Start accepts. Automaton has 2731 states and 3030 transitions. Word has length 95 [2021-05-06 11:24:57,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:57,044 INFO L480 AbstractCegarLoop]: Abstraction has 2731 states and 3030 transitions. [2021-05-06 11:24:57,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:57,044 INFO L276 IsEmpty]: Start isEmpty. Operand 2731 states and 3030 transitions. [2021-05-06 11:24:57,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-06 11:24:57,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:57,047 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:57,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:24:57,047 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:57,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:57,047 INFO L82 PathProgramCache]: Analyzing trace with hash -2109118051, now seen corresponding path program 41 times [2021-05-06 11:24:57,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:57,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39887528] [2021-05-06 11:24:57,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:57,050 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:57,050 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:57,051 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:57,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:57,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:57,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:57,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:57,246 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:57,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39887528] [2021-05-06 11:24:57,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [39887528] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:57,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:57,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:24:57,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392410370] [2021-05-06 11:24:57,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:24:57,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:57,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:24:57,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:24:57,247 INFO L87 Difference]: Start difference. First operand 2731 states and 3030 transitions. Second operand has 16 states, 16 states have (on average 3.5625) internal successors, (57), 15 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:08,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:08,748 INFO L93 Difference]: Finished difference Result 7137 states and 8088 transitions. [2021-05-06 11:25:08,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:25:08,749 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.5625) internal successors, (57), 15 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 96 [2021-05-06 11:25:08,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:08,753 INFO L225 Difference]: With dead ends: 7137 [2021-05-06 11:25:08,754 INFO L226 Difference]: Without dead ends: 6990 [2021-05-06 11:25:08,754 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 221.3ms TimeCoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:25:08,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6990 states. [2021-05-06 11:25:12,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6990 to 2731. [2021-05-06 11:25:12,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2731 states, 2726 states have (on average 1.1100513573000734) internal successors, (3026), 2726 states have internal predecessors, (3026), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:12,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2731 states to 2731 states and 3030 transitions. [2021-05-06 11:25:12,634 INFO L78 Accepts]: Start accepts. Automaton has 2731 states and 3030 transitions. Word has length 96 [2021-05-06 11:25:12,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:12,634 INFO L480 AbstractCegarLoop]: Abstraction has 2731 states and 3030 transitions. [2021-05-06 11:25:12,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.5625) internal successors, (57), 15 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:12,634 INFO L276 IsEmpty]: Start isEmpty. Operand 2731 states and 3030 transitions. [2021-05-06 11:25:12,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-06 11:25:12,637 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:12,637 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:12,637 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:25:12,637 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:12,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:12,637 INFO L82 PathProgramCache]: Analyzing trace with hash -861947120, now seen corresponding path program 8 times [2021-05-06 11:25:12,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:12,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695516342] [2021-05-06 11:25:12,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:12,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:12,640 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:12,641 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:12,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:12,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:12,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:12,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:12,950 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:12,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695516342] [2021-05-06 11:25:12,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1695516342] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:12,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:12,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:25:12,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967040670] [2021-05-06 11:25:12,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:25:12,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:12,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:25:12,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:25:12,951 INFO L87 Difference]: Start difference. First operand 2731 states and 3030 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:34,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:34,361 INFO L93 Difference]: Finished difference Result 12618 states and 14455 transitions. [2021-05-06 11:25:34,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:25:34,362 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 96 [2021-05-06 11:25:34,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:34,372 INFO L225 Difference]: With dead ends: 12618 [2021-05-06 11:25:34,372 INFO L226 Difference]: Without dead ends: 12551 [2021-05-06 11:25:34,373 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 264.0ms TimeCoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:25:34,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12551 states. [2021-05-06 11:25:38,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12551 to 2733. [2021-05-06 11:25:38,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2733 states, 2728 states have (on average 1.1103372434017595) internal successors, (3029), 2728 states have internal predecessors, (3029), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:38,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2733 states to 2733 states and 3033 transitions. [2021-05-06 11:25:38,344 INFO L78 Accepts]: Start accepts. Automaton has 2733 states and 3033 transitions. Word has length 96 [2021-05-06 11:25:38,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:38,344 INFO L480 AbstractCegarLoop]: Abstraction has 2733 states and 3033 transitions. [2021-05-06 11:25:38,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:38,344 INFO L276 IsEmpty]: Start isEmpty. Operand 2733 states and 3033 transitions. [2021-05-06 11:25:38,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:25:38,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:38,347 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:38,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:25:38,347 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:38,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:38,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1097721241, now seen corresponding path program 42 times [2021-05-06 11:25:38,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:38,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069661705] [2021-05-06 11:25:38,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:38,350 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:38,350 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:38,351 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:38,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:38,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:38,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:38,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:38,508 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:38,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069661705] [2021-05-06 11:25:38,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1069661705] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:38,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:38,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:25:38,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629906844] [2021-05-06 11:25:38,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:25:38,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:38,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:25:38,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:25:38,509 INFO L87 Difference]: Start difference. First operand 2733 states and 3033 transitions. Second operand has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:46,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:46,251 INFO L93 Difference]: Finished difference Result 4831 states and 5442 transitions. [2021-05-06 11:25:46,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:25:46,252 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 11:25:46,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:46,255 INFO L225 Difference]: With dead ends: 4831 [2021-05-06 11:25:46,255 INFO L226 Difference]: Without dead ends: 4601 [2021-05-06 11:25:46,255 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 203.8ms TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:25:46,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4601 states. [2021-05-06 11:25:50,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4601 to 2733. [2021-05-06 11:25:50,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2733 states, 2728 states have (on average 1.1103372434017595) internal successors, (3029), 2728 states have internal predecessors, (3029), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:50,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2733 states to 2733 states and 3033 transitions. [2021-05-06 11:25:50,305 INFO L78 Accepts]: Start accepts. Automaton has 2733 states and 3033 transitions. Word has length 97 [2021-05-06 11:25:50,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:50,305 INFO L480 AbstractCegarLoop]: Abstraction has 2733 states and 3033 transitions. [2021-05-06 11:25:50,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 4.0) internal successors, (56), 13 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:50,305 INFO L276 IsEmpty]: Start isEmpty. Operand 2733 states and 3033 transitions. [2021-05-06 11:25:50,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:25:50,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:50,307 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:25:50,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:25:50,307 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:50,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:50,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1419409540, now seen corresponding path program 43 times [2021-05-06 11:25:50,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:50,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349205544] [2021-05-06 11:25:50,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:50,311 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:50,311 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:50,312 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:50,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:50,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:50,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:50,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:50,573 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:50,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349205544] [2021-05-06 11:25:50,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1349205544] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:50,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:50,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:25:50,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930710868] [2021-05-06 11:25:50,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:25:50,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:50,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:25:50,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:25:50,574 INFO L87 Difference]: Start difference. First operand 2733 states and 3033 transitions. Second operand has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:08,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:08,722 INFO L93 Difference]: Finished difference Result 10234 states and 11668 transitions. [2021-05-06 11:26:08,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:26:08,722 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 11:26:08,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:08,729 INFO L225 Difference]: With dead ends: 10234 [2021-05-06 11:26:08,729 INFO L226 Difference]: Without dead ends: 10167 [2021-05-06 11:26:08,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 251.0ms TimeCoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:26:08,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10167 states. [2021-05-06 11:26:12,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10167 to 2733. [2021-05-06 11:26:12,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2733 states, 2728 states have (on average 1.1103372434017595) internal successors, (3029), 2728 states have internal predecessors, (3029), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:12,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2733 states to 2733 states and 3033 transitions. [2021-05-06 11:26:12,810 INFO L78 Accepts]: Start accepts. Automaton has 2733 states and 3033 transitions. Word has length 97 [2021-05-06 11:26:12,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:12,810 INFO L480 AbstractCegarLoop]: Abstraction has 2733 states and 3033 transitions. [2021-05-06 11:26:12,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.857142857142857) internal successors, (60), 20 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:12,810 INFO L276 IsEmpty]: Start isEmpty. Operand 2733 states and 3033 transitions. [2021-05-06 11:26:12,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:26:12,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:12,812 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:12,812 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:26:12,812 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:12,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:12,813 INFO L82 PathProgramCache]: Analyzing trace with hash -360832456, now seen corresponding path program 44 times [2021-05-06 11:26:12,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:12,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483286438] [2021-05-06 11:26:12,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:12,816 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:12,816 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:12,817 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:12,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:13,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:13,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:13,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:13,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:13,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483286438] [2021-05-06 11:26:13,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1483286438] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:13,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:13,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:26:13,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196396857] [2021-05-06 11:26:13,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:26:13,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:13,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:26:13,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=267, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:26:13,068 INFO L87 Difference]: Start difference. First operand 2733 states and 3033 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:27,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:27,384 INFO L93 Difference]: Finished difference Result 7962 states and 9033 transitions. [2021-05-06 11:26:27,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:26:27,385 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:26:27,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:27,390 INFO L225 Difference]: With dead ends: 7962 [2021-05-06 11:26:27,390 INFO L226 Difference]: Without dead ends: 7815 [2021-05-06 11:26:27,391 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 275.0ms TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:26:27,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7815 states. [2021-05-06 11:26:31,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7815 to 2733. [2021-05-06 11:26:31,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2733 states, 2728 states have (on average 1.1103372434017595) internal successors, (3029), 2728 states have internal predecessors, (3029), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:31,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2733 states to 2733 states and 3033 transitions. [2021-05-06 11:26:31,544 INFO L78 Accepts]: Start accepts. Automaton has 2733 states and 3033 transitions. Word has length 98 [2021-05-06 11:26:31,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:31,544 INFO L480 AbstractCegarLoop]: Abstraction has 2733 states and 3033 transitions. [2021-05-06 11:26:31,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:31,544 INFO L276 IsEmpty]: Start isEmpty. Operand 2733 states and 3033 transitions. [2021-05-06 11:26:31,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:26:31,546 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:31,546 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:31,546 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 11:26:31,546 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:31,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:31,547 INFO L82 PathProgramCache]: Analyzing trace with hash 886338475, now seen corresponding path program 9 times [2021-05-06 11:26:31,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:31,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452090429] [2021-05-06 11:26:31,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:31,550 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:31,550 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:31,550 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:31,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:31,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:31,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:31,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:31,885 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:31,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452090429] [2021-05-06 11:26:31,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [452090429] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:31,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:31,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:26:31,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542807082] [2021-05-06 11:26:31,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:26:31,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:31,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:26:31,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:26:31,886 INFO L87 Difference]: Start difference. First operand 2733 states and 3033 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 23 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:57,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:57,423 INFO L93 Difference]: Finished difference Result 13437 states and 15394 transitions. [2021-05-06 11:26:57,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:26:57,424 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 23 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-06 11:26:57,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:57,434 INFO L225 Difference]: With dead ends: 13437 [2021-05-06 11:26:57,434 INFO L226 Difference]: Without dead ends: 13370 [2021-05-06 11:26:57,435 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 294.7ms TimeCoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:26:57,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13370 states. [2021-05-06 11:27:01,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13370 to 2735. [2021-05-06 11:27:01,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2735 states, 2730 states have (on average 1.1106227106227107) internal successors, (3032), 2730 states have internal predecessors, (3032), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:01,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2735 states to 2735 states and 3036 transitions. [2021-05-06 11:27:01,617 INFO L78 Accepts]: Start accepts. Automaton has 2735 states and 3036 transitions. Word has length 98 [2021-05-06 11:27:01,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:01,617 INFO L480 AbstractCegarLoop]: Abstraction has 2735 states and 3036 transitions. [2021-05-06 11:27:01,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 23 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:01,617 INFO L276 IsEmpty]: Start isEmpty. Operand 2735 states and 3036 transitions. [2021-05-06 11:27:01,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:27:01,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:01,619 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:01,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:27:01,619 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:01,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:01,619 INFO L82 PathProgramCache]: Analyzing trace with hash -540000162, now seen corresponding path program 45 times [2021-05-06 11:27:01,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:01,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463817558] [2021-05-06 11:27:01,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:01,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:01,623 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:01,623 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:01,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:01,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:01,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:01,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:01,786 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:01,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463817558] [2021-05-06 11:27:01,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1463817558] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:01,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:01,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:27:01,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802566556] [2021-05-06 11:27:01,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:27:01,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:01,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:27:01,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:27:01,787 INFO L87 Difference]: Start difference. First operand 2735 states and 3036 transitions. Second operand has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:11,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:11,846 INFO L93 Difference]: Finished difference Result 5644 states and 6375 transitions. [2021-05-06 11:27:11,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:27:11,846 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 11:27:11,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:11,851 INFO L225 Difference]: With dead ends: 5644 [2021-05-06 11:27:11,851 INFO L226 Difference]: Without dead ends: 5414 [2021-05-06 11:27:11,852 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 201.5ms TimeCoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:27:11,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5414 states. [2021-05-06 11:27:16,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5414 to 2735. [2021-05-06 11:27:16,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2735 states, 2730 states have (on average 1.1106227106227107) internal successors, (3032), 2730 states have internal predecessors, (3032), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:16,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2735 states to 2735 states and 3036 transitions. [2021-05-06 11:27:16,079 INFO L78 Accepts]: Start accepts. Automaton has 2735 states and 3036 transitions. Word has length 99 [2021-05-06 11:27:16,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:16,079 INFO L480 AbstractCegarLoop]: Abstraction has 2735 states and 3036 transitions. [2021-05-06 11:27:16,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:16,079 INFO L276 IsEmpty]: Start isEmpty. Operand 2735 states and 3036 transitions. [2021-05-06 11:27:16,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:27:16,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:16,081 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:27:16,081 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:27:16,081 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:16,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:16,082 INFO L82 PathProgramCache]: Analyzing trace with hash -218311863, now seen corresponding path program 46 times [2021-05-06 11:27:16,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:16,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996295110] [2021-05-06 11:27:16,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:16,085 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:16,085 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:16,085 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:16,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:16,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:16,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:16,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:16,362 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:16,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996295110] [2021-05-06 11:27:16,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1996295110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:16,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:16,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:27:16,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78997158] [2021-05-06 11:27:16,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:27:16,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:16,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:27:16,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:27:16,363 INFO L87 Difference]: Start difference. First operand 2735 states and 3036 transitions. Second operand has 22 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 21 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:38,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:38,733 INFO L93 Difference]: Finished difference Result 11053 states and 12607 transitions. [2021-05-06 11:27:38,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:27:38,734 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 21 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 11:27:38,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:38,742 INFO L225 Difference]: With dead ends: 11053 [2021-05-06 11:27:38,742 INFO L226 Difference]: Without dead ends: 10986 [2021-05-06 11:27:38,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 269.9ms TimeCoverageRelationStatistics Valid=54, Invalid=498, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:27:38,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10986 states. [2021-05-06 11:27:43,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10986 to 2735. [2021-05-06 11:27:43,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2735 states, 2730 states have (on average 1.1106227106227107) internal successors, (3032), 2730 states have internal predecessors, (3032), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:43,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2735 states to 2735 states and 3036 transitions. [2021-05-06 11:27:43,191 INFO L78 Accepts]: Start accepts. Automaton has 2735 states and 3036 transitions. Word has length 99 [2021-05-06 11:27:43,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:43,191 INFO L480 AbstractCegarLoop]: Abstraction has 2735 states and 3036 transitions. [2021-05-06 11:27:43,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.8181818181818183) internal successors, (62), 21 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:43,191 INFO L276 IsEmpty]: Start isEmpty. Operand 2735 states and 3036 transitions. [2021-05-06 11:27:43,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 11:27:43,193 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:43,193 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:43,193 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 11:27:43,193 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:43,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:43,193 INFO L82 PathProgramCache]: Analyzing trace with hash 409411603, now seen corresponding path program 47 times [2021-05-06 11:27:43,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:43,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188700821] [2021-05-06 11:27:43,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:43,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:43,196 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:43,197 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:43,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:43,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:43,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:43,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:43,434 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:43,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188700821] [2021-05-06 11:27:43,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [188700821] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:43,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:43,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:27:43,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093404332] [2021-05-06 11:27:43,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:27:43,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:43,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:27:43,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:27:43,435 INFO L87 Difference]: Start difference. First operand 2735 states and 3036 transitions. Second operand has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 17 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:01,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:01,390 INFO L93 Difference]: Finished difference Result 8775 states and 9966 transitions. [2021-05-06 11:28:01,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:28:01,390 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 17 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-05-06 11:28:01,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:01,396 INFO L225 Difference]: With dead ends: 8775 [2021-05-06 11:28:01,396 INFO L226 Difference]: Without dead ends: 8628 [2021-05-06 11:28:01,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 267.0ms TimeCoverageRelationStatistics Valid=59, Invalid=447, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:28:01,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8628 states. [2021-05-06 11:28:05,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8628 to 2735. [2021-05-06 11:28:05,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2735 states, 2730 states have (on average 1.1106227106227107) internal successors, (3032), 2730 states have internal predecessors, (3032), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:05,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2735 states to 2735 states and 3036 transitions. [2021-05-06 11:28:05,783 INFO L78 Accepts]: Start accepts. Automaton has 2735 states and 3036 transitions. Word has length 100 [2021-05-06 11:28:05,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:05,783 INFO L480 AbstractCegarLoop]: Abstraction has 2735 states and 3036 transitions. [2021-05-06 11:28:05,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.388888888888889) internal successors, (61), 17 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:05,783 INFO L276 IsEmpty]: Start isEmpty. Operand 2735 states and 3036 transitions. [2021-05-06 11:28:05,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-05-06 11:28:05,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:05,785 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:05,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:28:05,785 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:05,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:05,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1656582534, now seen corresponding path program 10 times [2021-05-06 11:28:05,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:05,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259553624] [2021-05-06 11:28:05,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:05,788 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:05,788 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:05,789 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:05,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:06,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:06,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:06,168 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:06,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259553624] [2021-05-06 11:28:06,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [259553624] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:06,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:06,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:28:06,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627613551] [2021-05-06 11:28:06,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:28:06,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:06,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:28:06,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:28:06,169 INFO L87 Difference]: Start difference. First operand 2735 states and 3036 transitions. Second operand has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:39,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:39,191 INFO L93 Difference]: Finished difference Result 14898 states and 17081 transitions. [2021-05-06 11:28:39,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:28:39,192 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-05-06 11:28:39,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:39,204 INFO L225 Difference]: With dead ends: 14898 [2021-05-06 11:28:39,204 INFO L226 Difference]: Without dead ends: 14831 [2021-05-06 11:28:39,206 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 357.5ms TimeCoverageRelationStatistics Valid=56, Invalid=646, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:28:39,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14831 states. [2021-05-06 11:28:43,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14831 to 2739. [2021-05-06 11:28:43,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2739 states, 2734 states have (on average 1.111192392099488) internal successors, (3038), 2734 states have internal predecessors, (3038), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:43,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2739 states to 2739 states and 3042 transitions. [2021-05-06 11:28:43,691 INFO L78 Accepts]: Start accepts. Automaton has 2739 states and 3042 transitions. Word has length 100 [2021-05-06 11:28:43,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:43,691 INFO L480 AbstractCegarLoop]: Abstraction has 2739 states and 3042 transitions. [2021-05-06 11:28:43,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:43,692 INFO L276 IsEmpty]: Start isEmpty. Operand 2739 states and 3042 transitions. [2021-05-06 11:28:43,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:28:43,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:43,693 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:43,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:28:43,693 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:43,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:43,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1862729187, now seen corresponding path program 48 times [2021-05-06 11:28:43,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:43,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209944702] [2021-05-06 11:28:43,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:43,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:43,697 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:43,697 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:43,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:43,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:43,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:43,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:43,887 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:43,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209944702] [2021-05-06 11:28:43,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [209944702] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:43,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:43,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:28:43,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887671792] [2021-05-06 11:28:43,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:28:43,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:43,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:28:43,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:28:43,888 INFO L87 Difference]: Start difference. First operand 2739 states and 3042 transitions. Second operand has 15 states, 15 states have (on average 4.0) internal successors, (60), 14 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:57,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:57,306 INFO L93 Difference]: Finished difference Result 6465 states and 7317 transitions. [2021-05-06 11:28:57,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:28:57,307 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.0) internal successors, (60), 14 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:28:57,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:57,311 INFO L225 Difference]: With dead ends: 6465 [2021-05-06 11:28:57,311 INFO L226 Difference]: Without dead ends: 6235 [2021-05-06 11:28:57,312 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 229.2ms TimeCoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:28:57,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6235 states. [2021-05-06 11:29:01,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6235 to 2739. [2021-05-06 11:29:01,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2739 states, 2734 states have (on average 1.111192392099488) internal successors, (3038), 2734 states have internal predecessors, (3038), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:01,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2739 states to 2739 states and 3042 transitions. [2021-05-06 11:29:01,988 INFO L78 Accepts]: Start accepts. Automaton has 2739 states and 3042 transitions. Word has length 101 [2021-05-06 11:29:01,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:01,989 INFO L480 AbstractCegarLoop]: Abstraction has 2739 states and 3042 transitions. [2021-05-06 11:29:01,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.0) internal successors, (60), 14 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:01,989 INFO L276 IsEmpty]: Start isEmpty. Operand 2739 states and 3042 transitions. [2021-05-06 11:29:01,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:29:01,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:01,991 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:29:01,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 11:29:01,992 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:01,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:01,992 INFO L82 PathProgramCache]: Analyzing trace with hash -2110549810, now seen corresponding path program 49 times [2021-05-06 11:29:01,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:01,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791979276] [2021-05-06 11:29:01,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:01,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:01,995 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:01,996 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:02,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:02,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:02,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:02,355 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:02,355 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:02,355 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791979276] [2021-05-06 11:29:02,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [791979276] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:02,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:02,356 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:29:02,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485064791] [2021-05-06 11:29:02,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:29:02,356 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:02,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:29:02,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:29:02,356 INFO L87 Difference]: Start difference. First operand 2739 states and 3042 transitions. Second operand has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:30,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:30,445 INFO L93 Difference]: Finished difference Result 11874 states and 13549 transitions. [2021-05-06 11:29:30,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:29:30,446 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:29:30,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:30,454 INFO L225 Difference]: With dead ends: 11874 [2021-05-06 11:29:30,454 INFO L226 Difference]: Without dead ends: 11807 [2021-05-06 11:29:30,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 320.9ms TimeCoverageRelationStatistics Valid=56, Invalid=544, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:29:30,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11807 states. [2021-05-06 11:29:35,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11807 to 2739. [2021-05-06 11:29:35,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2739 states, 2734 states have (on average 1.111192392099488) internal successors, (3038), 2734 states have internal predecessors, (3038), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:35,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2739 states to 2739 states and 3042 transitions. [2021-05-06 11:29:35,169 INFO L78 Accepts]: Start accepts. Automaton has 2739 states and 3042 transitions. Word has length 101 [2021-05-06 11:29:35,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:35,170 INFO L480 AbstractCegarLoop]: Abstraction has 2739 states and 3042 transitions. [2021-05-06 11:29:35,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:35,170 INFO L276 IsEmpty]: Start isEmpty. Operand 2739 states and 3042 transitions. [2021-05-06 11:29:35,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:35,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:35,171 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:35,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:29:35,172 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:35,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:35,172 INFO L82 PathProgramCache]: Analyzing trace with hash -2101733253, now seen corresponding path program 50 times [2021-05-06 11:29:35,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:35,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598360433] [2021-05-06 11:29:35,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:35,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:35,176 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:35,176 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:35,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:35,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:35,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:35,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:35,311 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:35,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598360433] [2021-05-06 11:29:35,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [598360433] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:35,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:35,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:29:35,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526223080] [2021-05-06 11:29:35,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:29:35,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:35,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:29:35,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:29:35,311 INFO L87 Difference]: Start difference. First operand 2739 states and 3042 transitions. Second operand has 11 states, 11 states have (on average 5.363636363636363) internal successors, (59), 10 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:38,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:38,732 INFO L93 Difference]: Finished difference Result 3013 states and 3345 transitions. [2021-05-06 11:29:38,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:29:38,733 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.363636363636363) internal successors, (59), 10 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-05-06 11:29:38,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:38,737 INFO L225 Difference]: With dead ends: 3013 [2021-05-06 11:29:38,737 INFO L226 Difference]: Without dead ends: 1594 [2021-05-06 11:29:38,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 94.3ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:29:38,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1594 states. [2021-05-06 11:29:41,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1594 to 1520. [2021-05-06 11:29:41,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1520 states, 1515 states have (on average 1.1254125412541254) internal successors, (1705), 1515 states have internal predecessors, (1705), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:41,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1520 states to 1520 states and 1709 transitions. [2021-05-06 11:29:41,743 INFO L78 Accepts]: Start accepts. Automaton has 1520 states and 1709 transitions. Word has length 102 [2021-05-06 11:29:41,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:41,743 INFO L480 AbstractCegarLoop]: Abstraction has 1520 states and 1709 transitions. [2021-05-06 11:29:41,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.363636363636363) internal successors, (59), 10 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:41,744 INFO L276 IsEmpty]: Start isEmpty. Operand 1520 states and 1709 transitions. [2021-05-06 11:29:41,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:41,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:41,745 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:41,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:29:41,746 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:41,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:41,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1879577390, now seen corresponding path program 51 times [2021-05-06 11:29:41,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:41,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89321661] [2021-05-06 11:29:41,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:41,750 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:41,750 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:41,754 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:41,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:42,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:42,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:42,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:42,073 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:42,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89321661] [2021-05-06 11:29:42,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [89321661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:42,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:42,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:29:42,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543157066] [2021-05-06 11:29:42,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:29:42,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:42,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:29:42,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:29:42,074 INFO L87 Difference]: Start difference. First operand 1520 states and 1709 transitions. Second operand has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:03,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:30:03,124 INFO L93 Difference]: Finished difference Result 8341 states and 9530 transitions. [2021-05-06 11:30:03,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:30:03,125 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-05-06 11:30:03,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:30:03,130 INFO L225 Difference]: With dead ends: 8341 [2021-05-06 11:30:03,130 INFO L226 Difference]: Without dead ends: 8194 [2021-05-06 11:30:03,131 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 304.5ms TimeCoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:30:03,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8194 states. [2021-05-06 11:30:06,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8194 to 1520. [2021-05-06 11:30:06,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1520 states, 1515 states have (on average 1.1254125412541254) internal successors, (1705), 1515 states have internal predecessors, (1705), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:06,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1520 states to 1520 states and 1709 transitions. [2021-05-06 11:30:06,281 INFO L78 Accepts]: Start accepts. Automaton has 1520 states and 1709 transitions. Word has length 102 [2021-05-06 11:30:06,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:30:06,281 INFO L480 AbstractCegarLoop]: Abstraction has 1520 states and 1709 transitions. [2021-05-06 11:30:06,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:06,281 INFO L276 IsEmpty]: Start isEmpty. Operand 1520 states and 1709 transitions. [2021-05-06 11:30:06,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:30:06,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:30:06,282 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:30:06,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 11:30:06,282 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:30:06,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:30:06,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1967412989, now seen corresponding path program 52 times [2021-05-06 11:30:06,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:30:06,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898018073] [2021-05-06 11:30:06,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:30:06,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:30:06,286 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:30:06,287 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:30:06,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:07,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:30:07,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:07,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:30:07,041 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:30:07,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898018073] [2021-05-06 11:30:07,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1898018073] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:30:07,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:30:07,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:30:07,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469283706] [2021-05-06 11:30:07,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:30:07,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:30:07,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:30:07,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:30:07,042 INFO L87 Difference]: Start difference. First operand 1520 states and 1709 transitions. Second operand has 17 states, 17 states have (on average 4.117647058823529) internal successors, (70), 16 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:10,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:30:10,625 INFO L93 Difference]: Finished difference Result 1584 states and 1777 transitions. [2021-05-06 11:30:10,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:30:10,625 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.117647058823529) internal successors, (70), 16 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:30:10,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:30:10,627 INFO L225 Difference]: With dead ends: 1584 [2021-05-06 11:30:10,627 INFO L226 Difference]: Without dead ends: 992 [2021-05-06 11:30:10,627 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 650.6ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:30:10,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 992 states. [2021-05-06 11:30:12,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 992 to 992. [2021-05-06 11:30:12,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 987 states have (on average 1.165146909827761) internal successors, (1150), 987 states have internal predecessors, (1150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:12,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1154 transitions. [2021-05-06 11:30:12,913 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1154 transitions. Word has length 103 [2021-05-06 11:30:12,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:30:12,913 INFO L480 AbstractCegarLoop]: Abstraction has 992 states and 1154 transitions. [2021-05-06 11:30:12,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.117647058823529) internal successors, (70), 16 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:12,914 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1154 transitions. [2021-05-06 11:30:12,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:30:12,914 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:30:12,914 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:30:12,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:30:12,915 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:30:12,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:30:12,915 INFO L82 PathProgramCache]: Analyzing trace with hash 193228328, now seen corresponding path program 53 times [2021-05-06 11:30:12,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:30:12,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900938514] [2021-05-06 11:30:12,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:30:12,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:30:12,918 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:30:12,920 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:30:12,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:13,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:30:13,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:13,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:30:13,131 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:30:13,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900938514] [2021-05-06 11:30:13,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1900938514] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:30:13,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:30:13,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:30:13,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560144355] [2021-05-06 11:30:13,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:30:13,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:30:13,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:30:13,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=235, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:30:13,131 INFO L87 Difference]: Start difference. First operand 992 states and 1154 transitions. Second operand has 17 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:27,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:30:27,592 INFO L93 Difference]: Finished difference Result 5510 states and 6336 transitions. [2021-05-06 11:30:27,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:30:27,593 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:30:27,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:30:27,596 INFO L225 Difference]: With dead ends: 5510 [2021-05-06 11:30:27,596 INFO L226 Difference]: Without dead ends: 5280 [2021-05-06 11:30:27,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 281.9ms TimeCoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:30:27,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5280 states. [2021-05-06 11:30:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5280 to 992. [2021-05-06 11:30:29,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 987 states have (on average 1.165146909827761) internal successors, (1150), 987 states have internal predecessors, (1150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:29,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1154 transitions. [2021-05-06 11:30:29,955 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1154 transitions. Word has length 103 [2021-05-06 11:30:29,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:30:29,955 INFO L480 AbstractCegarLoop]: Abstraction has 992 states and 1154 transitions. [2021-05-06 11:30:29,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:30:29,955 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1154 transitions. [2021-05-06 11:30:29,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:30:29,956 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:30:29,956 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 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] [2021-05-06 11:30:29,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:30:29,956 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:30:29,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:30:29,956 INFO L82 PathProgramCache]: Analyzing trace with hash 514916627, now seen corresponding path program 54 times [2021-05-06 11:30:29,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:30:29,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565257701] [2021-05-06 11:30:29,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:30:29,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:30:29,960 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:30:29,960 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:30:29,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:30,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:30:30,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:30:30,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:30:30,293 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:30:30,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [565257701] [2021-05-06 11:30:30,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [565257701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:30:30,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:30:30,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:30:30,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856687027] [2021-05-06 11:30:30,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:30:30,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:30:30,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:30:30,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:30:30,294 INFO L87 Difference]: Start difference. First operand 992 states and 1154 transitions. Second operand has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:00,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:00,844 INFO L93 Difference]: Finished difference Result 10853 states and 12492 transitions. [2021-05-06 11:31:00,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:31:00,845 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-06 11:31:00,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:00,853 INFO L225 Difference]: With dead ends: 10853 [2021-05-06 11:31:00,853 INFO L226 Difference]: Without dead ends: 10786 [2021-05-06 11:31:00,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 342.8ms TimeCoverageRelationStatistics Valid=58, Invalid=592, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:31:00,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10786 states. [2021-05-06 11:31:03,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10786 to 992. [2021-05-06 11:31:03,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 987 states have (on average 1.165146909827761) internal successors, (1150), 987 states have internal predecessors, (1150), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:03,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1154 transitions. [2021-05-06 11:31:03,280 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1154 transitions. Word has length 103 [2021-05-06 11:31:03,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:03,280 INFO L480 AbstractCegarLoop]: Abstraction has 992 states and 1154 transitions. [2021-05-06 11:31:03,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:03,280 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1154 transitions. [2021-05-06 11:31:03,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:31:03,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:03,281 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:03,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:31:03,281 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:03,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:03,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1978314966, now seen corresponding path program 55 times [2021-05-06 11:31:03,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:03,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493577154] [2021-05-06 11:31:03,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:03,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:31:03,285 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:31:03,285 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:31:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:03,508 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 38 [2021-05-06 11:31:04,426 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 40 [2021-05-06 11:31:05,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:05,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:31:05,092 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:05,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493577154] [2021-05-06 11:31:05,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [493577154] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:05,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:05,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:31:05,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328402982] [2021-05-06 11:31:05,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:31:05,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:05,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:31:05,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=822, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:31:05,093 INFO L87 Difference]: Start difference. First operand 992 states and 1154 transitions. Second operand has 31 states, 31 states have (on average 2.903225806451613) internal successors, (90), 30 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:17,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:17,307 INFO L93 Difference]: Finished difference Result 4044 states and 4711 transitions. [2021-05-06 11:31:17,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:31:17,308 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.903225806451613) internal successors, (90), 30 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:31:17,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:17,311 INFO L225 Difference]: With dead ends: 4044 [2021-05-06 11:31:17,311 INFO L226 Difference]: Without dead ends: 4039 [2021-05-06 11:31:17,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 2157.3ms TimeCoverageRelationStatistics Valid=267, Invalid=1803, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:31:17,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4039 states. [2021-05-06 11:31:21,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4039 to 1624. [2021-05-06 11:31:21,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1624 states, 1619 states have (on average 1.1636812847436688) internal successors, (1884), 1619 states have internal predecessors, (1884), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:21,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1624 states to 1624 states and 1888 transitions. [2021-05-06 11:31:21,483 INFO L78 Accepts]: Start accepts. Automaton has 1624 states and 1888 transitions. Word has length 104 [2021-05-06 11:31:21,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:21,484 INFO L480 AbstractCegarLoop]: Abstraction has 1624 states and 1888 transitions. [2021-05-06 11:31:21,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.903225806451613) internal successors, (90), 30 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:21,484 INFO L276 IsEmpty]: Start isEmpty. Operand 1624 states and 1888 transitions. [2021-05-06 11:31:21,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:31:21,485 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:21,485 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:21,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:31:21,485 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:21,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:21,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1671312486, now seen corresponding path program 56 times [2021-05-06 11:31:21,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:21,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500548010] [2021-05-06 11:31:21,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:21,489 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:31:21,489 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:31:21,489 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:31:21,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:22,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:22,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:22,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:31:22,011 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:22,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500548010] [2021-05-06 11:31:22,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1500548010] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:22,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:22,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:31:22,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142799738] [2021-05-06 11:31:22,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:31:22,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:22,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:31:22,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:31:22,012 INFO L87 Difference]: Start difference. First operand 1624 states and 1888 transitions. Second operand has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:28,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:28,728 INFO L93 Difference]: Finished difference Result 2367 states and 2736 transitions. [2021-05-06 11:31:28,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:31:28,729 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:31:28,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:28,731 INFO L225 Difference]: With dead ends: 2367 [2021-05-06 11:31:28,731 INFO L226 Difference]: Without dead ends: 2362 [2021-05-06 11:31:28,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 405.9ms TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:31:28,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2362 states. [2021-05-06 11:31:31,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2362 to 1054. [2021-05-06 11:31:31,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1054 states, 1049 states have (on average 1.1649189704480458) internal successors, (1222), 1049 states have internal predecessors, (1222), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:31,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1054 states to 1054 states and 1226 transitions. [2021-05-06 11:31:31,840 INFO L78 Accepts]: Start accepts. Automaton has 1054 states and 1226 transitions. Word has length 104 [2021-05-06 11:31:31,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:31,840 INFO L480 AbstractCegarLoop]: Abstraction has 1054 states and 1226 transitions. [2021-05-06 11:31:31,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 15 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:31,840 INFO L276 IsEmpty]: Start isEmpty. Operand 1054 states and 1226 transitions. [2021-05-06 11:31:31,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:31:31,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:31,841 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:31,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:31:31,841 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:31,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:31,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1582654790, now seen corresponding path program 57 times [2021-05-06 11:31:31,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:31,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738872220] [2021-05-06 11:31:31,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:31,848 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:31:31,848 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:31:31,848 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:31:31,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:32,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:32,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:32,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:31:32,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:32,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738872220] [2021-05-06 11:31:32,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [738872220] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:32,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:32,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:31:32,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727436376] [2021-05-06 11:31:32,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:31:32,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:32,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:31:32,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:31:32,044 INFO L87 Difference]: Start difference. First operand 1054 states and 1226 transitions. Second operand has 15 states, 15 states have (on average 5.4) internal successors, (81), 13 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:38,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:38,354 INFO L93 Difference]: Finished difference Result 1697 states and 1963 transitions. [2021-05-06 11:31:38,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:31:38,355 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 5.4) internal successors, (81), 13 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:31:38,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:38,356 INFO L225 Difference]: With dead ends: 1697 [2021-05-06 11:31:38,356 INFO L226 Difference]: Without dead ends: 1692 [2021-05-06 11:31:38,357 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 313.4ms TimeCoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:31:38,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2021-05-06 11:31:42,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1222. [2021-05-06 11:31:42,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1222 states, 1217 states have (on average 1.162695152013147) internal successors, (1415), 1217 states have internal predecessors, (1415), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:42,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1222 states to 1222 states and 1419 transitions. [2021-05-06 11:31:42,265 INFO L78 Accepts]: Start accepts. Automaton has 1222 states and 1419 transitions. Word has length 114 [2021-05-06 11:31:42,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:31:42,265 INFO L480 AbstractCegarLoop]: Abstraction has 1222 states and 1419 transitions. [2021-05-06 11:31:42,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 5.4) internal successors, (81), 13 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:42,265 INFO L276 IsEmpty]: Start isEmpty. Operand 1222 states and 1419 transitions. [2021-05-06 11:31:42,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:31:42,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:31:42,266 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:31:42,266 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2021-05-06 11:31:42,266 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:31:42,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:31:42,266 INFO L82 PathProgramCache]: Analyzing trace with hash 995848776, now seen corresponding path program 58 times [2021-05-06 11:31:42,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:31:42,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116522425] [2021-05-06 11:31:42,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:31:42,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:31:42,270 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:31:42,270 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:31:42,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:43,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:31:43,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:31:43,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:31:43,536 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:31:43,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116522425] [2021-05-06 11:31:43,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [116522425] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:31:43,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:31:43,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:31:43,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562456213] [2021-05-06 11:31:43,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:31:43,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:31:43,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:31:43,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:31:43,537 INFO L87 Difference]: Start difference. First operand 1222 states and 1419 transitions. Second operand has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:31:55,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:31:55,837 INFO L93 Difference]: Finished difference Result 3384 states and 3904 transitions. [2021-05-06 11:31:55,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:31:55,837 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:31:55,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:31:55,840 INFO L225 Difference]: With dead ends: 3384 [2021-05-06 11:31:55,840 INFO L226 Difference]: Without dead ends: 3304 [2021-05-06 11:31:55,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 1146.8ms TimeCoverageRelationStatistics Valid=221, Invalid=1111, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:31:55,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3304 states. [2021-05-06 11:32:02,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3304 to 2104. [2021-05-06 11:32:02,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2104 states, 2099 states have (on average 1.1562648880419246) internal successors, (2427), 2099 states have internal predecessors, (2427), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:02,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2104 states to 2104 states and 2431 transitions. [2021-05-06 11:32:02,875 INFO L78 Accepts]: Start accepts. Automaton has 2104 states and 2431 transitions. Word has length 114 [2021-05-06 11:32:02,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:32:02,875 INFO L480 AbstractCegarLoop]: Abstraction has 2104 states and 2431 transitions. [2021-05-06 11:32:02,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:02,875 INFO L276 IsEmpty]: Start isEmpty. Operand 2104 states and 2431 transitions. [2021-05-06 11:32:02,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:32:02,876 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:32:02,877 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:32:02,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:32:02,877 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:32:02,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:32:02,877 INFO L82 PathProgramCache]: Analyzing trace with hash -222783544, now seen corresponding path program 59 times [2021-05-06 11:32:02,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:32:02,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574843891] [2021-05-06 11:32:02,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:32:02,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:32:02,880 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:32:02,881 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:32:02,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:04,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:32:04,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:04,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:32:04,139 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:32:04,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574843891] [2021-05-06 11:32:04,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [574843891] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:32:04,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:32:04,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:32:04,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979144214] [2021-05-06 11:32:04,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:32:04,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:32:04,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:32:04,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:32:04,142 INFO L87 Difference]: Start difference. First operand 2104 states and 2431 transitions. Second operand has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 22 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:19,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:32:19,380 INFO L93 Difference]: Finished difference Result 4321 states and 4975 transitions. [2021-05-06 11:32:19,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:32:19,381 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 22 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:32:19,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:32:19,384 INFO L225 Difference]: With dead ends: 4321 [2021-05-06 11:32:19,384 INFO L226 Difference]: Without dead ends: 4148 [2021-05-06 11:32:19,384 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1249.0ms TimeCoverageRelationStatistics Valid=203, Invalid=919, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:32:19,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4148 states. [2021-05-06 11:32:30,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4148 to 3138. [2021-05-06 11:32:30,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3138 states, 3133 states have (on average 1.1516118736035748) internal successors, (3608), 3133 states have internal predecessors, (3608), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:30,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3138 states to 3138 states and 3612 transitions. [2021-05-06 11:32:30,164 INFO L78 Accepts]: Start accepts. Automaton has 3138 states and 3612 transitions. Word has length 114 [2021-05-06 11:32:30,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:32:30,164 INFO L480 AbstractCegarLoop]: Abstraction has 3138 states and 3612 transitions. [2021-05-06 11:32:30,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.608695652173913) internal successors, (83), 22 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:30,164 INFO L276 IsEmpty]: Start isEmpty. Operand 3138 states and 3612 transitions. [2021-05-06 11:32:30,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:32:30,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:32:30,166 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:32:30,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:32:30,166 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:32:30,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:32:30,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1510268232, now seen corresponding path program 60 times [2021-05-06 11:32:30,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:32:30,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80391452] [2021-05-06 11:32:30,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:32:30,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:32:30,170 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:32:30,170 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:32:30,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:31,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:32:31,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:32:31,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:32:31,103 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:32:31,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80391452] [2021-05-06 11:32:31,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [80391452] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:32:31,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:32:31,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:32:31,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44899742] [2021-05-06 11:32:31,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:32:31,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:32:31,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:32:31,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:32:31,104 INFO L87 Difference]: Start difference. First operand 3138 states and 3612 transitions. Second operand has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 20 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:32:50,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:32:50,674 INFO L93 Difference]: Finished difference Result 5543 states and 6370 transitions. [2021-05-06 11:32:50,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:32:50,675 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 20 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:32:50,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:32:50,678 INFO L225 Difference]: With dead ends: 5543 [2021-05-06 11:32:50,678 INFO L226 Difference]: Without dead ends: 5165 [2021-05-06 11:32:50,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1159.5ms TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:32:50,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5165 states. [2021-05-06 11:33:04,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5165 to 3993. [2021-05-06 11:33:04,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3993 states, 3988 states have (on average 1.149949849548646) internal successors, (4586), 3988 states have internal predecessors, (4586), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:33:04,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3993 states to 3993 states and 4590 transitions. [2021-05-06 11:33:04,062 INFO L78 Accepts]: Start accepts. Automaton has 3993 states and 4590 transitions. Word has length 114 [2021-05-06 11:33:04,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:33:04,062 INFO L480 AbstractCegarLoop]: Abstraction has 3993 states and 4590 transitions. [2021-05-06 11:33:04,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.238095238095238) internal successors, (68), 20 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:33:04,062 INFO L276 IsEmpty]: Start isEmpty. Operand 3993 states and 4590 transitions. [2021-05-06 11:33:04,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:33:04,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:33:04,065 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:33:04,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2021-05-06 11:33:04,065 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:33:04,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:33:04,065 INFO L82 PathProgramCache]: Analyzing trace with hash 844294156, now seen corresponding path program 61 times [2021-05-06 11:33:04,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:33:04,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733637552] [2021-05-06 11:33:04,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:33:04,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:33:04,069 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:33:04,069 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:33:04,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:33:05,486 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 52 [2021-05-06 11:33:05,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:33:05,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:33:05,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:33:05,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:33:05,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733637552] [2021-05-06 11:33:05,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1733637552] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:33:05,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:33:05,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:33:05,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058636593] [2021-05-06 11:33:05,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:33:05,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:33:05,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:33:05,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:33:05,542 INFO L87 Difference]: Start difference. First operand 3993 states and 4590 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:33:29,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:33:29,974 INFO L93 Difference]: Finished difference Result 6893 states and 7900 transitions. [2021-05-06 11:33:29,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:33:29,975 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:33:29,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:33:29,979 INFO L225 Difference]: With dead ends: 6893 [2021-05-06 11:33:29,979 INFO L226 Difference]: Without dead ends: 6798 [2021-05-06 11:33:29,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 1625.8ms TimeCoverageRelationStatistics Valid=268, Invalid=1454, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:33:29,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6798 states. [2021-05-06 11:33:48,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6798 to 5479. [2021-05-06 11:33:48,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5479 states, 5474 states have (on average 1.1505297771282426) internal successors, (6298), 5474 states have internal predecessors, (6298), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:33:48,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5479 states to 5479 states and 6302 transitions. [2021-05-06 11:33:48,950 INFO L78 Accepts]: Start accepts. Automaton has 5479 states and 6302 transitions. Word has length 114 [2021-05-06 11:33:48,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:33:48,950 INFO L480 AbstractCegarLoop]: Abstraction has 5479 states and 6302 transitions. [2021-05-06 11:33:48,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:33:48,950 INFO L276 IsEmpty]: Start isEmpty. Operand 5479 states and 6302 transitions. [2021-05-06 11:33:48,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:33:48,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:33:48,976 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:33:48,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:33:48,976 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:33:48,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:33:48,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1325527096, now seen corresponding path program 62 times [2021-05-06 11:33:48,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:33:48,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311061397] [2021-05-06 11:33:48,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:33:48,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:33:48,980 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:33:48,980 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:33:49,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:33:50,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:33:50,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:33:50,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:33:50,341 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:33:50,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311061397] [2021-05-06 11:33:50,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1311061397] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:33:50,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:33:50,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:33:50,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82221193] [2021-05-06 11:33:50,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:33:50,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:33:50,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:33:50,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:33:50,342 INFO L87 Difference]: Start difference. First operand 5479 states and 6302 transitions. Second operand has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:34:14,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:34:14,437 INFO L93 Difference]: Finished difference Result 6832 states and 7822 transitions. [2021-05-06 11:34:14,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:34:14,438 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:34:14,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:34:14,443 INFO L225 Difference]: With dead ends: 6832 [2021-05-06 11:34:14,443 INFO L226 Difference]: Without dead ends: 6762 [2021-05-06 11:34:14,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 1522.4ms TimeCoverageRelationStatistics Valid=218, Invalid=1114, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:34:14,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6762 states. [2021-05-06 11:34:36,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6762 to 6287. [2021-05-06 11:34:36,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6287 states, 6282 states have (on average 1.1488379496975485) internal successors, (7217), 6282 states have internal predecessors, (7217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:34:36,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6287 states to 6287 states and 7221 transitions. [2021-05-06 11:34:36,575 INFO L78 Accepts]: Start accepts. Automaton has 6287 states and 7221 transitions. Word has length 114 [2021-05-06 11:34:36,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:34:36,575 INFO L480 AbstractCegarLoop]: Abstraction has 6287 states and 7221 transitions. [2021-05-06 11:34:36,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.56) internal successors, (89), 24 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:34:36,576 INFO L276 IsEmpty]: Start isEmpty. Operand 6287 states and 7221 transitions. [2021-05-06 11:34:36,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-05-06 11:34:36,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:34:36,581 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:34:36,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:34:36,582 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:34:36,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:34:36,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1519306100, now seen corresponding path program 63 times [2021-05-06 11:34:36,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:34:36,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45488657] [2021-05-06 11:34:36,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:34:36,585 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:34:36,585 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:34:36,586 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:34:36,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:34:37,197 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 36 [2021-05-06 11:34:38,158 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 61 [2021-05-06 11:34:38,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:34:38,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:34:38,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:34:38,214 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:34:38,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45488657] [2021-05-06 11:34:38,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [45488657] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:34:38,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:34:38,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:34:38,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240294092] [2021-05-06 11:34:38,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:34:38,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:34:38,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:34:38,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:34:38,215 INFO L87 Difference]: Start difference. First operand 6287 states and 7221 transitions. Second operand has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:35:03,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:35:03,063 INFO L93 Difference]: Finished difference Result 9185 states and 10531 transitions. [2021-05-06 11:35:03,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:35:03,063 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.3333333333333335) internal successors, (90), 26 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2021-05-06 11:35:03,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:35:03,069 INFO L225 Difference]: With dead ends: 9185 [2021-05-06 11:35:03,069 INFO L226 Difference]: Without dead ends: 6676 [2021-05-06 11:35:03,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 5 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1954.2ms TimeCoverageRelationStatistics Valid=316, Invalid=1664, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:35:03,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6676 states.