/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/insertion_sort-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:09:03,616 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:09:03,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:09:03,646 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:09:03,688 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:09:03,689 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:09:03,689 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:09:03,690 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 11:09:03,703 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:09:03,703 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:09:03,705 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:09:03,705 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:09:03,705 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:09:03,705 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:09:03,705 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:09:03,705 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:09:03,706 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:09:03,706 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:09:03,706 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:09:03,706 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:09:03,706 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:09:03,707 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:03,707 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:09:03,707 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:09:03,708 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:09:03,708 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:09:03,979 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:09:03,998 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:09:04,000 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:09:04,001 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:09:04,001 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:09:04,002 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/insertion_sort-2.c [2021-05-06 11:09:04,048 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf64632b/ef07ec53eb3c4f2da36b9101bc087f7e/FLAGa6e33d760 [2021-05-06 11:09:04,411 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:09:04,412 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/insertion_sort-2.c [2021-05-06 11:09:04,416 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf64632b/ef07ec53eb3c4f2da36b9101bc087f7e/FLAGa6e33d760 [2021-05-06 11:09:04,429 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbf64632b/ef07ec53eb3c4f2da36b9101bc087f7e [2021-05-06 11:09:04,438 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:04,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:04,442 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:04,442 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:04,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:04,445 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,446 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d59fb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04, skipping insertion in model container [2021-05-06 11:09:04,446 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:04,462 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:04,543 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/insertion_sort-2.c[328,341] [2021-05-06 11:09:04,555 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:04,563 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:04,584 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/insertion_sort-2.c[328,341] [2021-05-06 11:09:04,590 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:04,615 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:04,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04 WrapperNode [2021-05-06 11:09:04,615 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:04,616 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:04,616 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:04,616 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:04,622 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,622 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,626 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,630 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,636 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (1/1) ... [2021-05-06 11:09:04,639 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:04,640 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:04,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:04,640 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:04,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (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 11:09:04,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:04,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:04,688 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:04,688 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:04,688 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:04,688 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:04,689 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:04,914 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:04,914 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-05-06 11:09:04,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:04 BoogieIcfgContainer [2021-05-06 11:09:04,915 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:04,916 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:04,916 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:04,918 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:04,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:04" (1/3) ... [2021-05-06 11:09:04,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40bf890e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:04, skipping insertion in model container [2021-05-06 11:09:04,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:04" (2/3) ... [2021-05-06 11:09:04,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40bf890e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:04, skipping insertion in model container [2021-05-06 11:09:04,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:04" (3/3) ... [2021-05-06 11:09:04,920 INFO L111 eAbstractionObserver]: Analyzing ICFG insertion_sort-2.c [2021-05-06 11:09:04,924 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:04,927 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:04,957 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:04,986 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:04,986 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:04,986 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:04,986 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:04,987 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:04,987 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:04,987 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:04,987 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:05,007 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 24 states have internal predecessors, (34), 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 11:09:05,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:09:05,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,013 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,013 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1914549692, now seen corresponding path program 1 times [2021-05-06 11:09:05,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818475871] [2021-05-06 11:09:05,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,072 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,214 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 11:09:05,215 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818475871] [2021-05-06 11:09:05,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [818475871] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:09:05,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875675303] [2021-05-06 11:09:05,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:09:05,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:09:05,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:05,229 INFO L87 Difference]: Start difference. First operand has 31 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 24 states have internal predecessors, (34), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,291 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2021-05-06 11:09:05,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:09:05,292 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2021-05-06 11:09:05,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,296 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:09:05,296 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:09:05,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:05,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:09:05,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 11:09:05,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:05,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 11:09:05,322 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 15 [2021-05-06 11:09:05,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,322 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 11:09:05,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,323 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 11:09:05,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:09:05,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,323 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:05,324 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,324 INFO L82 PathProgramCache]: Analyzing trace with hash 314290466, now seen corresponding path program 1 times [2021-05-06 11:09:05,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575259592] [2021-05-06 11:09:05,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,326 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,487 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 11:09:05,487 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575259592] [2021-05-06 11:09:05,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1575259592] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:05,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296243805] [2021-05-06 11:09:05,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:05,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:05,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:05,491 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,592 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2021-05-06 11:09:05,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:05,593 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 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 15 [2021-05-06 11:09:05,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,593 INFO L225 Difference]: With dead ends: 49 [2021-05-06 11:09:05,594 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:09:05,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:05,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:09:05,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-06 11:09:05,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:05,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-05-06 11:09:05,606 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2021-05-06 11:09:05,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,607 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-05-06 11:09:05,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,607 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-05-06 11:09:05,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:09:05,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,608 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:05,609 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,609 INFO L82 PathProgramCache]: Analyzing trace with hash 408725728, now seen corresponding path program 1 times [2021-05-06 11:09:05,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216830431] [2021-05-06 11:09:05,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,625 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,628 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,896 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 11:09:05,897 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216830431] [2021-05-06 11:09:05,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1216830431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:05,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113663220] [2021-05-06 11:09:05,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:05,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:05,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:05,900 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,046 INFO L93 Difference]: Finished difference Result 51 states and 60 transitions. [2021-05-06 11:09:06,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:06,047 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 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 17 [2021-05-06 11:09:06,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,047 INFO L225 Difference]: With dead ends: 51 [2021-05-06 11:09:06,048 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:09:06,048 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 176.3ms TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:06,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:09:06,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-06 11:09:06,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:06,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-05-06 11:09:06,058 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2021-05-06 11:09:06,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,058 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-05-06 11:09:06,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,058 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-05-06 11:09:06,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:09:06,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,059 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:06,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:09:06,059 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,060 INFO L82 PathProgramCache]: Analyzing trace with hash 966699294, now seen corresponding path program 2 times [2021-05-06 11:09:06,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867665733] [2021-05-06 11:09:06,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,066 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,066 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,068 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,257 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 11:09:06,257 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,257 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867665733] [2021-05-06 11:09:06,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1867665733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,258 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,258 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:06,258 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619724189] [2021-05-06 11:09:06,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:06,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:06,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:06,262 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,409 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-06 11:09:06,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:06,410 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 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 19 [2021-05-06 11:09:06,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,411 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:09:06,412 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:09:06,412 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 113.3ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:06,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:09:06,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 30. [2021-05-06 11:09:06,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:06,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-05-06 11:09:06,419 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 19 [2021-05-06 11:09:06,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,419 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-05-06 11:09:06,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,420 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-05-06 11:09:06,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:09:06,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,420 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, 1] [2021-05-06 11:09:06,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:06,421 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1080556849, now seen corresponding path program 1 times [2021-05-06 11:09:06,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058692028] [2021-05-06 11:09:06,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,426 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,427 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,750 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 11:09:06,750 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058692028] [2021-05-06 11:09:06,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1058692028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:09:06,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299443853] [2021-05-06 11:09:06,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:09:06,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:09:06,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:06,752 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,309 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2021-05-06 11:09:07,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:07,309 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 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 25 [2021-05-06 11:09:07,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,310 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:09:07,310 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:09:07,311 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 460.8ms TimeCoverageRelationStatistics Valid=129, Invalid=521, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:07,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:09:07,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 44. [2021-05-06 11:09:07,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 36 states have (on average 1.25) internal successors, (45), 37 states have internal predecessors, (45), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:07,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2021-05-06 11:09:07,318 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 25 [2021-05-06 11:09:07,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,318 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2021-05-06 11:09:07,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,318 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2021-05-06 11:09:07,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:09:07,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,319 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, 1] [2021-05-06 11:09:07,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:09:07,319 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1781621427, now seen corresponding path program 1 times [2021-05-06 11:09:07,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166002245] [2021-05-06 11:09:07,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,327 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,328 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:07,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,376 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 11:09:07,376 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:07,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166002245] [2021-05-06 11:09:07,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [166002245] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:07,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:07,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:07,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007078688] [2021-05-06 11:09:07,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:07,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:07,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:07,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:07,377 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,439 INFO L93 Difference]: Finished difference Result 88 states and 108 transitions. [2021-05-06 11:09:07,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:07,440 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 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 25 [2021-05-06 11:09:07,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,443 INFO L225 Difference]: With dead ends: 88 [2021-05-06 11:09:07,443 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:09:07,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 29.2ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:07,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:09:07,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 46. [2021-05-06 11:09:07,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.236842105263158) internal successors, (47), 39 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:07,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-06 11:09:07,455 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 25 [2021-05-06 11:09:07,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,456 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-06 11:09:07,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,456 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-06 11:09:07,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 11:09:07,462 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,462 INFO L523 BasicCegarLoop]: trace histogram [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 11:09:07,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:09:07,462 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1755898038, now seen corresponding path program 1 times [2021-05-06 11:09:07,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318507296] [2021-05-06 11:09:07,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,492 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,493 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:07,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,791 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 11:09:07,791 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:07,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318507296] [2021-05-06 11:09:07,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1318507296] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:07,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:07,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:07,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375218722] [2021-05-06 11:09:07,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:07,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:07,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:07,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:07,792 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 17 states, 16 states have (on average 1.5) internal successors, (24), 15 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 11:09:08,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,373 INFO L93 Difference]: Finished difference Result 123 states and 153 transitions. [2021-05-06 11:09:08,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:09:08,374 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.5) internal successors, (24), 15 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 11:09:08,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,374 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:09:08,374 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:09:08,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 463.4ms TimeCoverageRelationStatistics Valid=171, Invalid=821, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:09:08,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:09:08,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 49. [2021-05-06 11:09:08,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 42 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:08,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-05-06 11:09:08,384 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 28 [2021-05-06 11:09:08,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,384 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-05-06 11:09:08,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.5) internal successors, (24), 15 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 11:09:08,384 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-05-06 11:09:08,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:09:08,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,385 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:09:08,385 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,385 INFO L82 PathProgramCache]: Analyzing trace with hash -990333180, now seen corresponding path program 2 times [2021-05-06 11:09:08,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146323904] [2021-05-06 11:09:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,389 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,390 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,469 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 11:09:08,470 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146323904] [2021-05-06 11:09:08,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2146323904] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:08,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965955322] [2021-05-06 11:09:08,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:08,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:08,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:08,471 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,589 INFO L93 Difference]: Finished difference Result 125 states and 152 transitions. [2021-05-06 11:09:08,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:08,590 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (3), 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 31 [2021-05-06 11:09:08,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,591 INFO L225 Difference]: With dead ends: 125 [2021-05-06 11:09:08,591 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 11:09:08,591 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 59.7ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:08,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 11:09:08,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 62. [2021-05-06 11:09:08,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.2037037037037037) internal successors, (65), 55 states have internal predecessors, (65), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:08,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-05-06 11:09:08,602 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 31 [2021-05-06 11:09:08,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,603 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-05-06 11:09:08,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,603 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-05-06 11:09:08,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:09:08,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,603 INFO L523 BasicCegarLoop]: trace histogram [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 11:09:08,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:09:08,604 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,604 INFO L82 PathProgramCache]: Analyzing trace with hash -405243253, now seen corresponding path program 1 times [2021-05-06 11:09:08,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392333860] [2021-05-06 11:09:08,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,608 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,609 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,609 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-06 11:09:08,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,701 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 11:09:08,701 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392333860] [2021-05-06 11:09:08,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [392333860] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:08,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075733749] [2021-05-06 11:09:08,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:08,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:08,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:08,702 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:08,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,833 INFO L93 Difference]: Finished difference Result 100 states and 118 transitions. [2021-05-06 11:09:08,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:09:08,834 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2021-05-06 11:09:08,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,834 INFO L225 Difference]: With dead ends: 100 [2021-05-06 11:09:08,835 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:09:08,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 89.1ms TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:08,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:09:08,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 58. [2021-05-06 11:09:08,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.2) internal successors, (60), 51 states have internal predecessors, (60), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:08,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-05-06 11:09:08,845 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 33 [2021-05-06 11:09:08,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,845 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-05-06 11:09:08,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:08,845 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-05-06 11:09:08,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:09:08,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,846 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:09:08,846 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1306424002, now seen corresponding path program 3 times [2021-05-06 11:09:08,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420889012] [2021-05-06 11:09:08,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,850 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,850 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,851 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:09,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,134 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 11:09:09,135 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:09,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420889012] [2021-05-06 11:09:09,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [420889012] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:09,135 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:09,135 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:09,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099368801] [2021-05-06 11:09:09,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:09,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:09,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:09,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:09,136 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:09,596 INFO L93 Difference]: Finished difference Result 83 states and 97 transitions. [2021-05-06 11:09:09,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:09,597 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 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 33 [2021-05-06 11:09:09,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:09,597 INFO L225 Difference]: With dead ends: 83 [2021-05-06 11:09:09,598 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:09:09,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 402.5ms TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:09:09,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:09:09,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 68. [2021-05-06 11:09:09,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 61 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:09,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 81 transitions. [2021-05-06 11:09:09,617 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 81 transitions. Word has length 33 [2021-05-06 11:09:09,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:09,618 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 81 transitions. [2021-05-06 11:09:09,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,618 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 81 transitions. [2021-05-06 11:09:09,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:09:09,623 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:09,623 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:09,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:09:09,624 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:09,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:09,624 INFO L82 PathProgramCache]: Analyzing trace with hash -350564349, now seen corresponding path program 1 times [2021-05-06 11:09:09,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:09,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610984655] [2021-05-06 11:09:09,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:09,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:09,630 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:09,631 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:09,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:09,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,916 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 11:09:09,916 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:09,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610984655] [2021-05-06 11:09:09,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1610984655] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:09,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:09,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:09,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661114567] [2021-05-06 11:09:09,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:09,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:09,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:09,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:09,917 INFO L87 Difference]: Start difference. First operand 68 states and 81 transitions. Second operand has 17 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,694 INFO L93 Difference]: Finished difference Result 158 states and 199 transitions. [2021-05-06 11:09:10,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:09:10,695 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 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 11:09:10,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,697 INFO L225 Difference]: With dead ends: 158 [2021-05-06 11:09:10,697 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:09:10,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 662.8ms TimeCoverageRelationStatistics Valid=445, Invalid=1717, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:09:10,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:09:10,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 77. [2021-05-06 11:09:10,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 69 states have (on average 1.289855072463768) internal successors, (89), 70 states have internal predecessors, (89), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:10,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 96 transitions. [2021-05-06 11:09:10,716 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 96 transitions. Word has length 36 [2021-05-06 11:09:10,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,716 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 96 transitions. [2021-05-06 11:09:10,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,716 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 96 transitions. [2021-05-06 11:09:10,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:09:10,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,717 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:09:10,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:09:10,717 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,718 INFO L82 PathProgramCache]: Analyzing trace with hash 350500229, now seen corresponding path program 2 times [2021-05-06 11:09:10,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370064864] [2021-05-06 11:09:10,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,722 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,722 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,724 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:10,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,787 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 11:09:10,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:10,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370064864] [2021-05-06 11:09:10,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [370064864] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:10,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:10,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:10,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176281222] [2021-05-06 11:09:10,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:10,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:10,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:10,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:10,788 INFO L87 Difference]: Start difference. First operand 77 states and 96 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,926 INFO L93 Difference]: Finished difference Result 151 states and 193 transitions. [2021-05-06 11:09:10,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:10,927 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (3), 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 11:09:10,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,927 INFO L225 Difference]: With dead ends: 151 [2021-05-06 11:09:10,927 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 11:09:10,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 58.1ms TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:10,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 11:09:10,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 83. [2021-05-06 11:09:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 76 states have internal predecessors, (92), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:10,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2021-05-06 11:09:10,940 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 36 [2021-05-06 11:09:10,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,940 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2021-05-06 11:09:10,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,941 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2021-05-06 11:09:10,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 11:09:10,941 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,941 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:09:10,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:09:10,941 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1169352267, now seen corresponding path program 3 times [2021-05-06 11:09:10,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885749769] [2021-05-06 11:09:10,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,945 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,946 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:11,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,289 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 11:09:11,290 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:11,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885749769] [2021-05-06 11:09:11,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [885749769] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:11,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:11,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:11,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57667259] [2021-05-06 11:09:11,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:11,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:11,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:11,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:11,291 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:11,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:11,690 INFO L93 Difference]: Finished difference Result 109 states and 129 transitions. [2021-05-06 11:09:11,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:11,690 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 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 11:09:11,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:11,691 INFO L225 Difference]: With dead ends: 109 [2021-05-06 11:09:11,691 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:09:11,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 421.3ms TimeCoverageRelationStatistics Valid=126, Invalid=686, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:09:11,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:09:11,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 83. [2021-05-06 11:09:11,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 76 states have internal predecessors, (92), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:11,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2021-05-06 11:09:11,705 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 36 [2021-05-06 11:09:11,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:11,705 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2021-05-06 11:09:11,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:11,705 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2021-05-06 11:09:11,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:09:11,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:11,706 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:11,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:09:11,706 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:11,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:11,707 INFO L82 PathProgramCache]: Analyzing trace with hash -930331484, now seen corresponding path program 4 times [2021-05-06 11:09:11,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:11,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460889616] [2021-05-06 11:09:11,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:11,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:11,711 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:11,712 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:11,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:12,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,020 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 11:09:12,020 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:12,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460889616] [2021-05-06 11:09:12,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1460889616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:12,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:12,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:09:12,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052161553] [2021-05-06 11:09:12,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:09:12,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:12,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:09:12,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:12,023 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:12,803 INFO L93 Difference]: Finished difference Result 188 states and 229 transitions. [2021-05-06 11:09:12,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:09:12,805 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (3), 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 11:09:12,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:12,807 INFO L225 Difference]: With dead ends: 188 [2021-05-06 11:09:12,807 INFO L226 Difference]: Without dead ends: 146 [2021-05-06 11:09:12,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 616.3ms TimeCoverageRelationStatistics Valid=297, Invalid=1343, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:09:12,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-06 11:09:12,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 80. [2021-05-06 11:09:12,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 72 states have (on average 1.2083333333333333) internal successors, (87), 73 states have internal predecessors, (87), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:12,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2021-05-06 11:09:12,828 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 39 [2021-05-06 11:09:12,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:12,828 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2021-05-06 11:09:12,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,828 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2021-05-06 11:09:12,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:09:12,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:12,829 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:09:12,829 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:09:12,829 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:12,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:12,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1624035100, now seen corresponding path program 2 times [2021-05-06 11:09:12,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:12,830 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1199908864] [2021-05-06 11:09:12,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:12,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:12,834 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:12,835 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:12,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 11:09:13,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,024 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 11:09:13,024 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1199908864] [2021-05-06 11:09:13,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1199908864] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:13,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892377752] [2021-05-06 11:09:13,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:13,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:13,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:13,026 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:13,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,445 INFO L93 Difference]: Finished difference Result 121 states and 142 transitions. [2021-05-06 11:09:13,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:13,445 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2021-05-06 11:09:13,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,446 INFO L225 Difference]: With dead ends: 121 [2021-05-06 11:09:13,446 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:09:13,449 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 279.8ms TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:09:13,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:09:13,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 97. [2021-05-06 11:09:13,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 86 states have (on average 1.197674418604651) internal successors, (103), 88 states have internal predecessors, (103), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:13,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 114 transitions. [2021-05-06 11:09:13,466 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 114 transitions. Word has length 41 [2021-05-06 11:09:13,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,466 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 114 transitions. [2021-05-06 11:09:13,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:13,467 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 114 transitions. [2021-05-06 11:09:13,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 11:09:13,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,468 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:09:13,468 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1436661232, now seen corresponding path program 2 times [2021-05-06 11:09:13,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289780723] [2021-05-06 11:09:13,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,473 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,473 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,474 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,588 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 11:09:13,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289780723] [2021-05-06 11:09:13,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1289780723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:13,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220692990] [2021-05-06 11:09:13,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:13,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:13,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:13,590 INFO L87 Difference]: Start difference. First operand 97 states and 114 transitions. Second operand has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 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 11:09:13,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,816 INFO L93 Difference]: Finished difference Result 218 states and 264 transitions. [2021-05-06 11:09:13,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:13,817 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 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 42 [2021-05-06 11:09:13,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,818 INFO L225 Difference]: With dead ends: 218 [2021-05-06 11:09:13,818 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 11:09:13,818 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 102.0ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:13,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 11:09:13,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 125. [2021-05-06 11:09:13,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 114 states have (on average 1.1842105263157894) internal successors, (135), 116 states have internal predecessors, (135), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:13,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 146 transitions. [2021-05-06 11:09:13,838 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 146 transitions. Word has length 42 [2021-05-06 11:09:13,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,838 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 146 transitions. [2021-05-06 11:09:13,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 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 11:09:13,839 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 146 transitions. [2021-05-06 11:09:13,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:13,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,839 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,839 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:09:13,839 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,840 INFO L82 PathProgramCache]: Analyzing trace with hash -2084807843, now seen corresponding path program 1 times [2021-05-06 11:09:13,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118396981] [2021-05-06 11:09:13,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,844 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,844 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,845 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-06 11:09:13,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,999 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 11:09:13,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118396981] [2021-05-06 11:09:13,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2118396981] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:13,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145434793] [2021-05-06 11:09:14,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:14,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:14,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:14,000 INFO L87 Difference]: Start difference. First operand 125 states and 146 transitions. Second operand has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:14,475 INFO L93 Difference]: Finished difference Result 164 states and 191 transitions. [2021-05-06 11:09:14,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:14,475 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 44 [2021-05-06 11:09:14,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:14,476 INFO L225 Difference]: With dead ends: 164 [2021-05-06 11:09:14,476 INFO L226 Difference]: Without dead ends: 162 [2021-05-06 11:09:14,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 261.6ms TimeCoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:14,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-06 11:09:14,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 126. [2021-05-06 11:09:14,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 115 states have (on average 1.191304347826087) internal successors, (137), 117 states have internal predecessors, (137), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:14,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 148 transitions. [2021-05-06 11:09:14,497 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 148 transitions. Word has length 44 [2021-05-06 11:09:14,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:14,497 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 148 transitions. [2021-05-06 11:09:14,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.7142857142857144) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:14,497 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 148 transitions. [2021-05-06 11:09:14,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:14,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,498 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,498 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:09:14,498 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1979815022, now seen corresponding path program 3 times [2021-05-06 11:09:14,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682483836] [2021-05-06 11:09:14,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:14,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:14,502 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:14,503 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:14,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,914 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 11:09:14,915 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:14,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682483836] [2021-05-06 11:09:14,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1682483836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:14,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:14,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:14,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179956721] [2021-05-06 11:09:14,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:14,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:14,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:14,917 INFO L87 Difference]: Start difference. First operand 126 states and 148 transitions. Second operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 11:09:15,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,742 INFO L93 Difference]: Finished difference Result 212 states and 251 transitions. [2021-05-06 11:09:15,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:09:15,742 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 44 [2021-05-06 11:09:15,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,743 INFO L225 Difference]: With dead ends: 212 [2021-05-06 11:09:15,743 INFO L226 Difference]: Without dead ends: 210 [2021-05-06 11:09:15,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 624.9ms TimeCoverageRelationStatistics Valid=189, Invalid=1143, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:09:15,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-06 11:09:15,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 136. [2021-05-06 11:09:15,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 125 states have (on average 1.2) internal successors, (150), 127 states have internal predecessors, (150), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:15,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 161 transitions. [2021-05-06 11:09:15,766 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 161 transitions. Word has length 44 [2021-05-06 11:09:15,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,766 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 161 transitions. [2021-05-06 11:09:15,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 11:09:15,766 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 161 transitions. [2021-05-06 11:09:15,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:15,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,766 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:09:15,766 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1128449496, now seen corresponding path program 4 times [2021-05-06 11:09:15,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038673028] [2021-05-06 11:09:15,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,770 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,770 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:15,771 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:16,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,157 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 11:09:16,157 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:16,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038673028] [2021-05-06 11:09:16,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2038673028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:16,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:16,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:16,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485124423] [2021-05-06 11:09:16,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:16,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:16,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:16,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:16,158 INFO L87 Difference]: Start difference. First operand 136 states and 161 transitions. Second operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 11:09:17,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:17,207 INFO L93 Difference]: Finished difference Result 265 states and 319 transitions. [2021-05-06 11:09:17,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:09:17,208 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 44 [2021-05-06 11:09:17,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:17,209 INFO L225 Difference]: With dead ends: 265 [2021-05-06 11:09:17,209 INFO L226 Difference]: Without dead ends: 226 [2021-05-06 11:09:17,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 814.7ms TimeCoverageRelationStatistics Valid=278, Invalid=1614, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:17,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-06 11:09:17,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2021-05-06 11:09:17,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 147 states have (on average 1.2244897959183674) internal successors, (180), 149 states have internal predecessors, (180), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:09:17,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 191 transitions. [2021-05-06 11:09:17,246 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 191 transitions. Word has length 44 [2021-05-06 11:09:17,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:17,246 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 191 transitions. [2021-05-06 11:09:17,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 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 11:09:17,246 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 191 transitions. [2021-05-06 11:09:17,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:17,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:17,247 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:09:17,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:09:17,247 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:17,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:17,247 INFO L82 PathProgramCache]: Analyzing trace with hash -172816864, now seen corresponding path program 5 times [2021-05-06 11:09:17,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:17,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481982457] [2021-05-06 11:09:17,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:17,251 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:17,251 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:17,251 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:17,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:17,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,605 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 11:09:17,605 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:17,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481982457] [2021-05-06 11:09:17,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [481982457] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:17,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:17,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:17,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637132678] [2021-05-06 11:09:17,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:17,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:17,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:17,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:17,606 INFO L87 Difference]: Start difference. First operand 158 states and 191 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 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 11:09:18,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:18,384 INFO L93 Difference]: Finished difference Result 214 states and 256 transitions. [2021-05-06 11:09:18,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:09:18,384 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 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 44 [2021-05-06 11:09:18,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:18,385 INFO L225 Difference]: With dead ends: 214 [2021-05-06 11:09:18,385 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:09:18,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 627.0ms TimeCoverageRelationStatistics Valid=189, Invalid=1001, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:09:18,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:09:18,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 183. [2021-05-06 11:09:18,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 170 states have (on average 1.2176470588235293) internal successors, (207), 173 states have internal predecessors, (207), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 3 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 11:09:18,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 220 transitions. [2021-05-06 11:09:18,418 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 220 transitions. Word has length 44 [2021-05-06 11:09:18,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:18,419 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 220 transitions. [2021-05-06 11:09:18,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 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 11:09:18,419 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 220 transitions. [2021-05-06 11:09:18,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:18,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:18,419 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:09:18,419 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:09:18,419 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:18,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:18,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1585209602, now seen corresponding path program 1 times [2021-05-06 11:09:18,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:18,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116108639] [2021-05-06 11:09:18,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:18,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:18,424 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:18,425 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:18,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:18,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-06 11:09:18,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,995 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 11:09:18,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:18,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116108639] [2021-05-06 11:09:18,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2116108639] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:18,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:18,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:18,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652444097] [2021-05-06 11:09:18,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:18,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:18,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:18,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=555, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:18,997 INFO L87 Difference]: Start difference. First operand 183 states and 220 transitions. Second operand has 26 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:20,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:20,694 INFO L93 Difference]: Finished difference Result 314 states and 377 transitions. [2021-05-06 11:09:20,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:09:20,695 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 47 [2021-05-06 11:09:20,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:20,697 INFO L225 Difference]: With dead ends: 314 [2021-05-06 11:09:20,697 INFO L226 Difference]: Without dead ends: 312 [2021-05-06 11:09:20,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 1386.3ms TimeCoverageRelationStatistics Valid=514, Invalid=3392, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:09:20,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-06 11:09:20,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 233. [2021-05-06 11:09:20,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 215 states have (on average 1.2093023255813953) internal successors, (260), 221 states have internal predecessors, (260), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:20,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-05-06 11:09:20,742 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 47 [2021-05-06 11:09:20,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:20,742 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-05-06 11:09:20,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.64) internal successors, (41), 24 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:20,743 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-05-06 11:09:20,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:09:20,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:20,743 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:20,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:09:20,743 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:20,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:20,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1571697014, now seen corresponding path program 3 times [2021-05-06 11:09:20,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:20,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310413052] [2021-05-06 11:09:20,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:20,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:20,747 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:20,748 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:20,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:20,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-06 11:09:20,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:20,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,838 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 11:09:20,838 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:20,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310413052] [2021-05-06 11:09:20,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [310413052] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:20,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:20,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:20,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648593524] [2021-05-06 11:09:20,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:20,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:20,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:20,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:20,839 INFO L87 Difference]: Start difference. First operand 233 states and 281 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:21,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:21,111 INFO L93 Difference]: Finished difference Result 283 states and 339 transitions. [2021-05-06 11:09:21,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:21,113 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 49 [2021-05-06 11:09:21,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:21,114 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:09:21,114 INFO L226 Difference]: Without dead ends: 228 [2021-05-06 11:09:21,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 118.5ms TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:21,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-05-06 11:09:21,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 210. [2021-05-06 11:09:21,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 194 states have (on average 1.190721649484536) internal successors, (231), 199 states have internal predecessors, (231), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:21,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 249 transitions. [2021-05-06 11:09:21,154 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 249 transitions. Word has length 49 [2021-05-06 11:09:21,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:21,154 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 249 transitions. [2021-05-06 11:09:21,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:21,154 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 249 transitions. [2021-05-06 11:09:21,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:21,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:21,155 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:21,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:09:21,155 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:21,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:21,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1212783309, now seen corresponding path program 5 times [2021-05-06 11:09:21,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:21,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092429380] [2021-05-06 11:09:21,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:21,159 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:21,159 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:21,159 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:21,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:21,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,361 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 11:09:21,362 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:21,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092429380] [2021-05-06 11:09:21,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2092429380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:21,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:21,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:09:21,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668752176] [2021-05-06 11:09:21,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:09:21,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:21,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:09:21,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:21,363 INFO L87 Difference]: Start difference. First operand 210 states and 249 transitions. Second operand has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 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 11:09:22,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:22,341 INFO L93 Difference]: Finished difference Result 322 states and 389 transitions. [2021-05-06 11:09:22,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:09:22,342 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 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 47 [2021-05-06 11:09:22,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:22,344 INFO L225 Difference]: With dead ends: 322 [2021-05-06 11:09:22,344 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 11:09:22,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 865 ImplicationChecksByTransitivity, 731.3ms TimeCoverageRelationStatistics Valid=658, Invalid=2422, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:09:22,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 11:09:22,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 230. [2021-05-06 11:09:22,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 212 states have (on average 1.1981132075471699) internal successors, (254), 218 states have internal predecessors, (254), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 4 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 11:09:22,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 274 transitions. [2021-05-06 11:09:22,392 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 274 transitions. Word has length 47 [2021-05-06 11:09:22,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:22,392 INFO L480 AbstractCegarLoop]: Abstraction has 230 states and 274 transitions. [2021-05-06 11:09:22,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 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 11:09:22,392 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 274 transitions. [2021-05-06 11:09:22,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:22,393 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:22,393 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:22,393 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:09:22,393 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:22,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:22,393 INFO L82 PathProgramCache]: Analyzing trace with hash -511718731, now seen corresponding path program 6 times [2021-05-06 11:09:22,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:22,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086106106] [2021-05-06 11:09:22,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:22,399 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:22,399 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:22,400 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:22,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:22,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,454 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 11:09:22,454 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:22,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086106106] [2021-05-06 11:09:22,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086106106] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:22,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:22,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:09:22,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831604703] [2021-05-06 11:09:22,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:09:22,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:22,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:09:22,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:22,455 INFO L87 Difference]: Start difference. First operand 230 states and 274 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 11:09:22,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:22,742 INFO L93 Difference]: Finished difference Result 379 states and 463 transitions. [2021-05-06 11:09:22,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:09:22,745 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 47 [2021-05-06 11:09:22,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:22,746 INFO L225 Difference]: With dead ends: 379 [2021-05-06 11:09:22,746 INFO L226 Difference]: Without dead ends: 287 [2021-05-06 11:09:22,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 125.6ms TimeCoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:22,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-05-06 11:09:22,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 238. [2021-05-06 11:09:22,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 220 states have (on average 1.2) internal successors, (264), 226 states have internal predecessors, (264), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 4 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 11:09:22,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 284 transitions. [2021-05-06 11:09:22,792 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 284 transitions. Word has length 47 [2021-05-06 11:09:22,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:22,792 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 284 transitions. [2021-05-06 11:09:22,792 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 11:09:22,792 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 284 transitions. [2021-05-06 11:09:22,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:22,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:22,793 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:22,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:09:22,793 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:22,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:22,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1895537965, now seen corresponding path program 6 times [2021-05-06 11:09:22,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:22,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007569203] [2021-05-06 11:09:22,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:22,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:22,797 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:22,797 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:22,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:23,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:23,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:23,221 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 11:09:23,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:23,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007569203] [2021-05-06 11:09:23,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1007569203] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:23,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:23,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:23,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352400271] [2021-05-06 11:09:23,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:23,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:23,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:23,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:23,222 INFO L87 Difference]: Start difference. First operand 238 states and 284 transitions. Second operand has 21 states, 20 states have (on average 2.05) internal successors, (41), 19 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 11:09:24,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:24,067 INFO L93 Difference]: Finished difference Result 283 states and 336 transitions. [2021-05-06 11:09:24,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:09:24,067 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.05) internal successors, (41), 19 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 47 [2021-05-06 11:09:24,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:24,068 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:09:24,068 INFO L226 Difference]: Without dead ends: 281 [2021-05-06 11:09:24,069 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 647.3ms TimeCoverageRelationStatistics Valid=171, Invalid=1019, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:09:24,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-05-06 11:09:24,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 241. [2021-05-06 11:09:24,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 223 states have (on average 1.201793721973094) internal successors, (268), 229 states have internal predecessors, (268), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 4 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 11:09:24,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 288 transitions. [2021-05-06 11:09:24,112 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 288 transitions. Word has length 47 [2021-05-06 11:09:24,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:24,112 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 288 transitions. [2021-05-06 11:09:24,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.05) internal successors, (41), 19 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 11:09:24,117 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 288 transitions. [2021-05-06 11:09:24,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:24,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:24,118 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:24,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:09:24,118 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:24,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:24,118 INFO L82 PathProgramCache]: Analyzing trace with hash -879512715, now seen corresponding path program 7 times [2021-05-06 11:09:24,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:24,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550937447] [2021-05-06 11:09:24,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:24,122 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:24,122 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:24,123 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:24,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:24,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:24,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:24,510 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 11:09:24,510 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:24,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550937447] [2021-05-06 11:09:24,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [550937447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:24,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:24,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:24,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887903776] [2021-05-06 11:09:24,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:24,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:24,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:24,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:24,512 INFO L87 Difference]: Start difference. First operand 241 states and 288 transitions. Second operand has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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 11:09:26,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:26,007 INFO L93 Difference]: Finished difference Result 409 states and 492 transitions. [2021-05-06 11:09:26,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:09:26,008 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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 47 [2021-05-06 11:09:26,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:26,010 INFO L225 Difference]: With dead ends: 409 [2021-05-06 11:09:26,010 INFO L226 Difference]: Without dead ends: 311 [2021-05-06 11:09:26,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1156.9ms TimeCoverageRelationStatistics Valid=482, Invalid=2598, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:09:26,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-06 11:09:26,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 238. [2021-05-06 11:09:26,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 221 states have (on average 1.2036199095022624) internal successors, (266), 226 states have internal predecessors, (266), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:26,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 284 transitions. [2021-05-06 11:09:26,058 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 284 transitions. Word has length 47 [2021-05-06 11:09:26,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:26,058 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 284 transitions. [2021-05-06 11:09:26,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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 11:09:26,058 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 284 transitions. [2021-05-06 11:09:26,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:09:26,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:26,058 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:26,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:09:26,059 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:26,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:26,059 INFO L82 PathProgramCache]: Analyzing trace with hash -2050746395, now seen corresponding path program 8 times [2021-05-06 11:09:26,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:26,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761686464] [2021-05-06 11:09:26,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:26,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:26,063 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:26,063 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:26,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:26,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:26,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:26,467 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 11:09:26,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:26,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761686464] [2021-05-06 11:09:26,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [761686464] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:26,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:26,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:26,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565987300] [2021-05-06 11:09:26,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:26,467 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:26,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:26,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:26,468 INFO L87 Difference]: Start difference. First operand 238 states and 284 transitions. Second operand has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 20 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 11:09:27,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:27,086 INFO L93 Difference]: Finished difference Result 288 states and 342 transitions. [2021-05-06 11:09:27,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:09:27,086 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 20 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 47 [2021-05-06 11:09:27,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:27,087 INFO L225 Difference]: With dead ends: 288 [2021-05-06 11:09:27,087 INFO L226 Difference]: Without dead ends: 286 [2021-05-06 11:09:27,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 532.5ms TimeCoverageRelationStatistics Valid=142, Invalid=914, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:09:27,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-05-06 11:09:27,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 238. [2021-05-06 11:09:27,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 221 states have (on average 1.2036199095022624) internal successors, (266), 226 states have internal predecessors, (266), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 11:09:27,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 284 transitions. [2021-05-06 11:09:27,132 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 284 transitions. Word has length 47 [2021-05-06 11:09:27,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:27,132 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 284 transitions. [2021-05-06 11:09:27,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 20 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 11:09:27,132 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 284 transitions. [2021-05-06 11:09:27,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:09:27,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:27,133 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 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] [2021-05-06 11:09:27,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:09:27,133 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:27,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:27,133 INFO L82 PathProgramCache]: Analyzing trace with hash -42029369, now seen corresponding path program 2 times [2021-05-06 11:09:27,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:27,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381099268] [2021-05-06 11:09:27,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:27,136 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:27,136 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:27,137 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:27,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:27,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:27,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:27,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-06 11:09:27,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:27,720 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 11:09:27,720 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:27,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381099268] [2021-05-06 11:09:27,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [381099268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:27,720 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:27,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:27,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421804745] [2021-05-06 11:09:27,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:27,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:27,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:27,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:27,721 INFO L87 Difference]: Start difference. First operand 238 states and 284 transitions. Second operand has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:28,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:28,975 INFO L93 Difference]: Finished difference Result 248 states and 293 transitions. [2021-05-06 11:09:28,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:09:28,976 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 50 [2021-05-06 11:09:28,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:28,977 INFO L225 Difference]: With dead ends: 248 [2021-05-06 11:09:28,977 INFO L226 Difference]: Without dead ends: 208 [2021-05-06 11:09:28,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1149.6ms TimeCoverageRelationStatistics Valid=370, Invalid=2282, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:09:28,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-06 11:09:29,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 204. [2021-05-06 11:09:29,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 190 states have (on average 1.2263157894736842) internal successors, (233), 194 states have internal predecessors, (233), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:29,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 248 transitions. [2021-05-06 11:09:29,017 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 248 transitions. Word has length 50 [2021-05-06 11:09:29,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:29,017 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 248 transitions. [2021-05-06 11:09:29,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.76) internal successors, (44), 24 states have internal predecessors, (44), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:29,017 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 248 transitions. [2021-05-06 11:09:29,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:09:29,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:29,017 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:29,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:09:29,018 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:29,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:29,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1165803103, now seen corresponding path program 7 times [2021-05-06 11:09:29,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:29,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844313221] [2021-05-06 11:09:29,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:29,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:29,023 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:29,025 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:29,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:29,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:29,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:29,147 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 11:09:29,147 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:29,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844313221] [2021-05-06 11:09:29,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1844313221] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:29,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:29,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:09:29,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954945007] [2021-05-06 11:09:29,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:09:29,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:29,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:09:29,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:29,149 INFO L87 Difference]: Start difference. First operand 204 states and 248 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 11:09:29,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:29,459 INFO L93 Difference]: Finished difference Result 489 states and 603 transitions. [2021-05-06 11:09:29,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:29,460 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 50 [2021-05-06 11:09:29,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:29,461 INFO L225 Difference]: With dead ends: 489 [2021-05-06 11:09:29,461 INFO L226 Difference]: Without dead ends: 376 [2021-05-06 11:09:29,462 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 135.8ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:29,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-05-06 11:09:29,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 289. [2021-05-06 11:09:29,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 275 states have (on average 1.2072727272727273) internal successors, (332), 279 states have internal predecessors, (332), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:29,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 347 transitions. [2021-05-06 11:09:29,517 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 347 transitions. Word has length 50 [2021-05-06 11:09:29,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:29,517 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 347 transitions. [2021-05-06 11:09:29,517 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 11:09:29,517 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 347 transitions. [2021-05-06 11:09:29,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:09:29,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:29,518 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:29,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:09:29,518 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:29,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:29,518 INFO L82 PathProgramCache]: Analyzing trace with hash 904028532, now seen corresponding path program 9 times [2021-05-06 11:09:29,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:29,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730476631] [2021-05-06 11:09:29,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:29,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:29,522 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:29,523 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:29,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:29,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:29,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:29,816 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 11:09:29,816 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:29,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730476631] [2021-05-06 11:09:29,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [730476631] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:29,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:29,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:29,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634104682] [2021-05-06 11:09:29,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:29,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:29,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:29,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:29,817 INFO L87 Difference]: Start difference. First operand 289 states and 347 transitions. Second operand has 21 states, 20 states have (on average 2.2) internal successors, (44), 19 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 11:09:30,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:30,768 INFO L93 Difference]: Finished difference Result 500 states and 608 transitions. [2021-05-06 11:09:30,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:09:30,769 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 19 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 50 [2021-05-06 11:09:30,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:30,770 INFO L225 Difference]: With dead ends: 500 [2021-05-06 11:09:30,770 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 11:09:30,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 726.1ms TimeCoverageRelationStatistics Valid=489, Invalid=2061, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:09:30,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 11:09:30,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 290. [2021-05-06 11:09:30,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 276 states have (on average 1.1992753623188406) internal successors, (331), 280 states have internal predecessors, (331), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:30,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 346 transitions. [2021-05-06 11:09:30,827 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 346 transitions. Word has length 50 [2021-05-06 11:09:30,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:30,828 INFO L480 AbstractCegarLoop]: Abstraction has 290 states and 346 transitions. [2021-05-06 11:09:30,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.2) internal successors, (44), 19 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 11:09:30,828 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 346 transitions. [2021-05-06 11:09:30,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:09:30,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:30,828 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:30,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:09:30,828 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:30,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:30,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1297158544, now seen corresponding path program 10 times [2021-05-06 11:09:30,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:30,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1873420537] [2021-05-06 11:09:30,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:30,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:30,832 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:30,833 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:30,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:31,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:31,209 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 11:09:31,209 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:31,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1873420537] [2021-05-06 11:09:31,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1873420537] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:31,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:31,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:31,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972369837] [2021-05-06 11:09:31,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:31,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:31,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:31,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:31,210 INFO L87 Difference]: Start difference. First operand 290 states and 346 transitions. Second operand has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 11:09:31,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:31,908 INFO L93 Difference]: Finished difference Result 356 states and 424 transitions. [2021-05-06 11:09:31,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:09:31,908 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 50 [2021-05-06 11:09:31,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:31,909 INFO L225 Difference]: With dead ends: 356 [2021-05-06 11:09:31,909 INFO L226 Difference]: Without dead ends: 354 [2021-05-06 11:09:31,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 576.4ms TimeCoverageRelationStatistics Valid=162, Invalid=1098, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:09:31,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-06 11:09:31,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 281. [2021-05-06 11:09:31,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 267 states have (on average 1.198501872659176) internal successors, (320), 271 states have internal predecessors, (320), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (7), 3 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 11:09:31,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 335 transitions. [2021-05-06 11:09:31,963 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 335 transitions. Word has length 50 [2021-05-06 11:09:31,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:31,964 INFO L480 AbstractCegarLoop]: Abstraction has 281 states and 335 transitions. [2021-05-06 11:09:31,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 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 11:09:31,964 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 335 transitions. [2021-05-06 11:09:31,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:09:31,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:31,964 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:31,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:09:31,964 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:31,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:31,965 INFO L82 PathProgramCache]: Analyzing trace with hash -787548180, now seen corresponding path program 2 times [2021-05-06 11:09:31,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:31,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237188616] [2021-05-06 11:09:31,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:31,968 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:31,968 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:31,969 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:31,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:32,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:32,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:32,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 11:09:32,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:32,128 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 11:09:32,128 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:32,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237188616] [2021-05-06 11:09:32,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [237188616] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:32,129 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:32,129 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:32,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177926872] [2021-05-06 11:09:32,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:32,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:32,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:32,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:32,130 INFO L87 Difference]: Start difference. First operand 281 states and 335 transitions. Second operand has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:32,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:32,948 INFO L93 Difference]: Finished difference Result 394 states and 470 transitions. [2021-05-06 11:09:32,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:09:32,949 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 11:09:32,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:32,950 INFO L225 Difference]: With dead ends: 394 [2021-05-06 11:09:32,950 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 11:09:32,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 473.5ms TimeCoverageRelationStatistics Valid=221, Invalid=1671, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:32,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 11:09:33,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 313. [2021-05-06 11:09:33,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 295 states have (on average 1.193220338983051) internal successors, (352), 301 states have internal predecessors, (352), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:33,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 373 transitions. [2021-05-06 11:09:33,016 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 373 transitions. Word has length 52 [2021-05-06 11:09:33,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:33,016 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 373 transitions. [2021-05-06 11:09:33,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:33,017 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 373 transitions. [2021-05-06 11:09:33,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:09:33,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:33,017 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:33,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:09:33,017 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:33,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:33,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1609585614, now seen corresponding path program 3 times [2021-05-06 11:09:33,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:33,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108781796] [2021-05-06 11:09:33,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:33,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:33,021 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:33,022 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:33,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:33,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:33,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:33,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 11:09:33,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:33,468 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 11:09:33,468 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:33,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108781796] [2021-05-06 11:09:33,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [108781796] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:33,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:33,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:09:33,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692720778] [2021-05-06 11:09:33,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:09:33,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:33,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:09:33,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:33,469 INFO L87 Difference]: Start difference. First operand 313 states and 373 transitions. Second operand has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:34,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:34,579 INFO L93 Difference]: Finished difference Result 401 states and 476 transitions. [2021-05-06 11:09:34,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:09:34,580 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-05-06 11:09:34,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:34,586 INFO L225 Difference]: With dead ends: 401 [2021-05-06 11:09:34,586 INFO L226 Difference]: Without dead ends: 399 [2021-05-06 11:09:34,587 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 834.5ms TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:34,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-06 11:09:34,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 307. [2021-05-06 11:09:34,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 289 states have (on average 1.193771626297578) internal successors, (345), 295 states have internal predecessors, (345), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:34,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 366 transitions. [2021-05-06 11:09:34,657 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 366 transitions. Word has length 52 [2021-05-06 11:09:34,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:34,657 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 366 transitions. [2021-05-06 11:09:34,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:34,657 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 366 transitions. [2021-05-06 11:09:34,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:09:34,658 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:34,658 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:34,658 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:09:34,658 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:34,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:34,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1574158879, now seen corresponding path program 8 times [2021-05-06 11:09:34,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:34,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654868756] [2021-05-06 11:09:34,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:34,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:34,663 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:34,663 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:35,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:35,291 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 11:09:35,291 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:35,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654868756] [2021-05-06 11:09:35,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1654868756] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:35,291 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:35,291 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:09:35,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852578112] [2021-05-06 11:09:35,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:09:35,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:35,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:09:35,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:09:35,292 INFO L87 Difference]: Start difference. First operand 307 states and 366 transitions. Second operand has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 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 11:09:36,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:36,569 INFO L93 Difference]: Finished difference Result 601 states and 733 transitions. [2021-05-06 11:09:36,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:09:36,570 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 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 52 [2021-05-06 11:09:36,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:36,571 INFO L225 Difference]: With dead ends: 601 [2021-05-06 11:09:36,571 INFO L226 Difference]: Without dead ends: 502 [2021-05-06 11:09:36,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 6 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 509 ImplicationChecksByTransitivity, 909.9ms TimeCoverageRelationStatistics Valid=224, Invalid=1668, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:36,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-06 11:09:36,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 377. [2021-05-06 11:09:36,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 359 states have (on average 1.2200557103064067) internal successors, (438), 365 states have internal predecessors, (438), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:36,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 459 transitions. [2021-05-06 11:09:36,651 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 459 transitions. Word has length 52 [2021-05-06 11:09:36,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:36,651 INFO L480 AbstractCegarLoop]: Abstraction has 377 states and 459 transitions. [2021-05-06 11:09:36,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.92) internal successors, (48), 24 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 11:09:36,651 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 459 transitions. [2021-05-06 11:09:36,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:09:36,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:36,652 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:36,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:09:36,652 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:36,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:36,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1534105639, now seen corresponding path program 9 times [2021-05-06 11:09:36,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:36,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1456441315] [2021-05-06 11:09:36,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:36,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:36,655 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:36,656 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:36,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:37,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:37,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:37,221 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 11:09:37,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:37,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1456441315] [2021-05-06 11:09:37,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1456441315] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:37,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:37,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:09:37,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087590703] [2021-05-06 11:09:37,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:09:37,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:37,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:09:37,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:09:37,223 INFO L87 Difference]: Start difference. First operand 377 states and 459 transitions. Second operand has 27 states, 26 states have (on average 1.8461538461538463) internal successors, (48), 25 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 11:09:38,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:38,336 INFO L93 Difference]: Finished difference Result 528 states and 639 transitions. [2021-05-06 11:09:38,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:09:38,337 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.8461538461538463) internal successors, (48), 25 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 52 [2021-05-06 11:09:38,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:38,338 INFO L225 Difference]: With dead ends: 528 [2021-05-06 11:09:38,338 INFO L226 Difference]: Without dead ends: 378 [2021-05-06 11:09:38,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 878.0ms TimeCoverageRelationStatistics Valid=334, Invalid=1922, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:09:38,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-05-06 11:09:38,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 305. [2021-05-06 11:09:38,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 286 states have (on average 1.1783216783216783) internal successors, (337), 292 states have internal predecessors, (337), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:38,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 358 transitions. [2021-05-06 11:09:38,408 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 358 transitions. Word has length 52 [2021-05-06 11:09:38,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:38,408 INFO L480 AbstractCegarLoop]: Abstraction has 305 states and 358 transitions. [2021-05-06 11:09:38,408 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.8461538461538463) internal successors, (48), 25 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 11:09:38,408 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 358 transitions. [2021-05-06 11:09:38,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-06 11:09:38,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:38,409 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:38,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:09:38,409 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:38,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:38,410 INFO L82 PathProgramCache]: Analyzing trace with hash 2038277613, now seen corresponding path program 10 times [2021-05-06 11:09:38,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:38,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171986597] [2021-05-06 11:09:38,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:38,413 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:38,413 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:38,414 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:38,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:38,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:38,869 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 11:09:38,869 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:38,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171986597] [2021-05-06 11:09:38,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [171986597] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:38,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:38,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:38,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214398115] [2021-05-06 11:09:38,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:38,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:38,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:38,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:38,870 INFO L87 Difference]: Start difference. First operand 305 states and 358 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 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 11:09:39,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:39,869 INFO L93 Difference]: Finished difference Result 441 states and 523 transitions. [2021-05-06 11:09:39,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:09:39,870 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 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 52 [2021-05-06 11:09:39,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:39,871 INFO L225 Difference]: With dead ends: 441 [2021-05-06 11:09:39,871 INFO L226 Difference]: Without dead ends: 439 [2021-05-06 11:09:39,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 716.9ms TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:09:39,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-05-06 11:09:39,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 311. [2021-05-06 11:09:39,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 292 states have (on average 1.178082191780822) internal successors, (344), 298 states have internal predecessors, (344), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:39,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 365 transitions. [2021-05-06 11:09:39,946 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 365 transitions. Word has length 52 [2021-05-06 11:09:39,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:39,946 INFO L480 AbstractCegarLoop]: Abstraction has 311 states and 365 transitions. [2021-05-06 11:09:39,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 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 11:09:39,946 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 365 transitions. [2021-05-06 11:09:39,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:39,947 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:39,947 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 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] [2021-05-06 11:09:39,947 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:09:39,947 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:39,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:39,947 INFO L82 PathProgramCache]: Analyzing trace with hash 650625165, now seen corresponding path program 4 times [2021-05-06 11:09:39,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:39,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767131817] [2021-05-06 11:09:39,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:39,953 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:39,953 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:39,953 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:39,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:40,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:40,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:40,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-06 11:09:40,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:40,127 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 11:09:40,127 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:40,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767131817] [2021-05-06 11:09:40,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [767131817] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:40,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:40,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:40,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209815898] [2021-05-06 11:09:40,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:40,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:40,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:40,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:40,128 INFO L87 Difference]: Start difference. First operand 311 states and 365 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:41,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:41,151 INFO L93 Difference]: Finished difference Result 411 states and 485 transitions. [2021-05-06 11:09:41,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:09:41,152 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2021-05-06 11:09:41,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:41,153 INFO L225 Difference]: With dead ends: 411 [2021-05-06 11:09:41,153 INFO L226 Difference]: Without dead ends: 409 [2021-05-06 11:09:41,154 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 515.8ms TimeCoverageRelationStatistics Valid=178, Invalid=1628, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:09:41,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-05-06 11:09:41,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 311. [2021-05-06 11:09:41,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 292 states have (on average 1.178082191780822) internal successors, (344), 298 states have internal predecessors, (344), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (10), 4 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 11:09:41,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 365 transitions. [2021-05-06 11:09:41,226 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 365 transitions. Word has length 55 [2021-05-06 11:09:41,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:41,226 INFO L480 AbstractCegarLoop]: Abstraction has 311 states and 365 transitions. [2021-05-06 11:09:41,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:41,226 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 365 transitions. [2021-05-06 11:09:41,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:09:41,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:41,227 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:41,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:09:41,227 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:41,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:41,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1147005369, now seen corresponding path program 4 times [2021-05-06 11:09:41,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:41,228 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346400848] [2021-05-06 11:09:41,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:41,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:41,233 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:41,233 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:41,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:41,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:09:41,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:09:41,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:41,539 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 11:09:41,539 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:41,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346400848] [2021-05-06 11:09:41,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1346400848] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:41,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:41,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:41,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073607452] [2021-05-06 11:09:41,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:41,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:41,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:41,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:41,541 INFO L87 Difference]: Start difference. First operand 311 states and 365 transitions. Second operand has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:42,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:42,164 INFO L93 Difference]: Finished difference Result 385 states and 454 transitions. [2021-05-06 11:09:42,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:09:42,164 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-05-06 11:09:42,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:42,165 INFO L225 Difference]: With dead ends: 385 [2021-05-06 11:09:42,165 INFO L226 Difference]: Without dead ends: 383 [2021-05-06 11:09:42,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 480.0ms TimeCoverageRelationStatistics Valid=169, Invalid=953, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:09:42,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-06 11:09:42,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 358. [2021-05-06 11:09:42,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 330 states have (on average 1.1666666666666667) internal successors, (385), 340 states have internal predecessors, (385), 19 states have call successors, (19), 9 states have call predecessors, (19), 8 states have return successors, (18), 8 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-06 11:09:42,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 422 transitions. [2021-05-06 11:09:42,260 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 422 transitions. Word has length 57 [2021-05-06 11:09:42,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:42,261 INFO L480 AbstractCegarLoop]: Abstraction has 358 states and 422 transitions. [2021-05-06 11:09:42,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:42,261 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 422 transitions. [2021-05-06 11:09:42,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:42,261 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:42,262 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:42,262 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:09:42,262 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:42,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:42,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1946369156, now seen corresponding path program 11 times [2021-05-06 11:09:42,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:42,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329225040] [2021-05-06 11:09:42,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:42,265 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:42,265 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:42,266 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:42,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:43,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:43,010 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 11:09:43,010 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:43,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329225040] [2021-05-06 11:09:43,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [329225040] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:43,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:43,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:09:43,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785027057] [2021-05-06 11:09:43,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:09:43,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:43,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:09:43,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:09:43,011 INFO L87 Difference]: Start difference. First operand 358 states and 422 transitions. Second operand has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 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 11:09:44,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:44,526 INFO L93 Difference]: Finished difference Result 540 states and 643 transitions. [2021-05-06 11:09:44,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:09:44,527 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 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 55 [2021-05-06 11:09:44,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:44,528 INFO L225 Difference]: With dead ends: 540 [2021-05-06 11:09:44,529 INFO L226 Difference]: Without dead ends: 538 [2021-05-06 11:09:44,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 4 SyntacticMatches, 7 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 1211.9ms TimeCoverageRelationStatistics Valid=303, Invalid=2453, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:09:44,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-06 11:09:44,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 397. [2021-05-06 11:09:44,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 365 states have (on average 1.16986301369863) internal successors, (427), 377 states have internal predecessors, (427), 21 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 8 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:44,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 468 transitions. [2021-05-06 11:09:44,635 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 468 transitions. Word has length 55 [2021-05-06 11:09:44,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:44,635 INFO L480 AbstractCegarLoop]: Abstraction has 397 states and 468 transitions. [2021-05-06 11:09:44,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 25 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 11:09:44,636 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 468 transitions. [2021-05-06 11:09:44,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:44,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:44,636 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:44,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:09:44,637 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:44,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:44,637 INFO L82 PathProgramCache]: Analyzing trace with hash -426979644, now seen corresponding path program 12 times [2021-05-06 11:09:44,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:44,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452821555] [2021-05-06 11:09:44,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:44,641 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:44,641 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:44,642 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:44,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:45,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:45,093 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 11:09:45,093 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:45,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452821555] [2021-05-06 11:09:45,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [452821555] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:45,093 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:45,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:09:45,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388015388] [2021-05-06 11:09:45,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:09:45,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:45,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:09:45,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:09:45,094 INFO L87 Difference]: Start difference. First operand 397 states and 468 transitions. Second operand has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 11:09:46,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:46,518 INFO L93 Difference]: Finished difference Result 498 states and 590 transitions. [2021-05-06 11:09:46,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:09:46,518 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 55 [2021-05-06 11:09:46,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:46,520 INFO L225 Difference]: With dead ends: 498 [2021-05-06 11:09:46,520 INFO L226 Difference]: Without dead ends: 496 [2021-05-06 11:09:46,520 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 1049.3ms TimeCoverageRelationStatistics Valid=440, Invalid=2640, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:09:46,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-05-06 11:09:46,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 406. [2021-05-06 11:09:46,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 374 states have (on average 1.1737967914438503) internal successors, (439), 386 states have internal predecessors, (439), 21 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 8 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:46,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 480 transitions. [2021-05-06 11:09:46,632 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 480 transitions. Word has length 55 [2021-05-06 11:09:46,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:46,632 INFO L480 AbstractCegarLoop]: Abstraction has 406 states and 480 transitions. [2021-05-06 11:09:46,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 11:09:46,632 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 480 transitions. [2021-05-06 11:09:46,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:46,633 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:46,633 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:46,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:09:46,634 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:46,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:46,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1046366456, now seen corresponding path program 13 times [2021-05-06 11:09:46,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:46,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960829273] [2021-05-06 11:09:46,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:46,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:46,638 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:46,640 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:46,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:47,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:47,196 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 11:09:47,196 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:47,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960829273] [2021-05-06 11:09:47,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1960829273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:47,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:47,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:09:47,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112316092] [2021-05-06 11:09:47,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:09:47,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:47,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:09:47,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=517, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:09:47,197 INFO L87 Difference]: Start difference. First operand 406 states and 480 transitions. Second operand has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 11:09:48,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:48,651 INFO L93 Difference]: Finished difference Result 525 states and 623 transitions. [2021-05-06 11:09:48,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:09:48,652 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 55 [2021-05-06 11:09:48,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:48,653 INFO L225 Difference]: With dead ends: 525 [2021-05-06 11:09:48,653 INFO L226 Difference]: Without dead ends: 523 [2021-05-06 11:09:48,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1002.1ms TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:09:48,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-06 11:09:48,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 403. [2021-05-06 11:09:48,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 372 states have (on average 1.1774193548387097) internal successors, (438), 383 states have internal predecessors, (438), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (19), 8 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 11:09:48,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 477 transitions. [2021-05-06 11:09:48,799 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 477 transitions. Word has length 55 [2021-05-06 11:09:48,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:48,799 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 477 transitions. [2021-05-06 11:09:48,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.125) internal successors, (51), 23 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 11:09:48,799 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 477 transitions. [2021-05-06 11:09:48,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:48,800 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:48,800 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:48,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:09:48,800 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:48,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:48,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1524488624, now seen corresponding path program 11 times [2021-05-06 11:09:48,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:48,801 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552418447] [2021-05-06 11:09:48,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:48,804 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:48,804 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:48,808 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:48,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:49,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:49,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:49,497 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 11:09:49,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:49,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552418447] [2021-05-06 11:09:49,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1552418447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:49,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:49,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:09:49,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611179578] [2021-05-06 11:09:49,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:09:49,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:49,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:09:49,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:09:49,500 INFO L87 Difference]: Start difference. First operand 403 states and 477 transitions. Second operand has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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 11:09:50,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:50,497 INFO L93 Difference]: Finished difference Result 456 states and 539 transitions. [2021-05-06 11:09:50,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:09:50,497 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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 55 [2021-05-06 11:09:50,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:50,499 INFO L225 Difference]: With dead ends: 456 [2021-05-06 11:09:50,499 INFO L226 Difference]: Without dead ends: 454 [2021-05-06 11:09:50,499 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 933.4ms TimeCoverageRelationStatistics Valid=323, Invalid=1657, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:09:50,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-05-06 11:09:50,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 419. [2021-05-06 11:09:50,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 386 states have (on average 1.1787564766839378) internal successors, (455), 398 states have internal predecessors, (455), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 8 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:50,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 496 transitions. [2021-05-06 11:09:50,612 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 496 transitions. Word has length 55 [2021-05-06 11:09:50,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:50,612 INFO L480 AbstractCegarLoop]: Abstraction has 419 states and 496 transitions. [2021-05-06 11:09:50,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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 11:09:50,612 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 496 transitions. [2021-05-06 11:09:50,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:09:50,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:50,613 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:50,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:09:50,613 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:50,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:50,614 INFO L82 PathProgramCache]: Analyzing trace with hash 337785846, now seen corresponding path program 12 times [2021-05-06 11:09:50,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:50,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940603710] [2021-05-06 11:09:50,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:50,617 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:50,617 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:50,618 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:50,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:51,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:51,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:51,091 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 11:09:51,091 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:51,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940603710] [2021-05-06 11:09:51,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1940603710] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:51,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:51,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:09:51,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105915337] [2021-05-06 11:09:51,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:09:51,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:51,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:09:51,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:09:51,092 INFO L87 Difference]: Start difference. First operand 419 states and 496 transitions. Second operand has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 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 11:09:52,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:52,050 INFO L93 Difference]: Finished difference Result 489 states and 579 transitions. [2021-05-06 11:09:52,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:09:52,050 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 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 55 [2021-05-06 11:09:52,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:52,052 INFO L225 Difference]: With dead ends: 489 [2021-05-06 11:09:52,052 INFO L226 Difference]: Without dead ends: 487 [2021-05-06 11:09:52,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 769.3ms TimeCoverageRelationStatistics Valid=245, Invalid=1477, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:09:52,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-05-06 11:09:52,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 422. [2021-05-06 11:09:52,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 389 states have (on average 1.179948586118252) internal successors, (459), 401 states have internal predecessors, (459), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 8 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:52,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 500 transitions. [2021-05-06 11:09:52,166 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 500 transitions. Word has length 55 [2021-05-06 11:09:52,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:52,166 INFO L480 AbstractCegarLoop]: Abstraction has 422 states and 500 transitions. [2021-05-06 11:09:52,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 23 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 11:09:52,166 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 500 transitions. [2021-05-06 11:09:52,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:09:52,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:52,167 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:52,167 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:09:52,167 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:52,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:52,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1285024718, now seen corresponding path program 3 times [2021-05-06 11:09:52,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:52,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752619456] [2021-05-06 11:09:52,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:52,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:52,171 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:52,171 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:52,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 11:09:52,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:52,811 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 11:09:52,811 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:52,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752619456] [2021-05-06 11:09:52,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [752619456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:52,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:52,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:09:52,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085909028] [2021-05-06 11:09:52,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:09:52,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:52,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:09:52,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=703, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:09:52,812 INFO L87 Difference]: Start difference. First operand 422 states and 500 transitions. Second operand has 29 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:54,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:54,959 INFO L93 Difference]: Finished difference Result 548 states and 646 transitions. [2021-05-06 11:09:54,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:09:54,959 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 11:09:54,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:54,961 INFO L225 Difference]: With dead ends: 548 [2021-05-06 11:09:54,961 INFO L226 Difference]: Without dead ends: 546 [2021-05-06 11:09:54,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1618 ImplicationChecksByTransitivity, 1817.6ms TimeCoverageRelationStatistics Valid=644, Invalid=4758, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:09:54,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-06 11:09:55,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 442. [2021-05-06 11:09:55,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 410 states have (on average 1.1829268292682926) internal successors, (485), 422 states have internal predecessors, (485), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (19), 7 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 11:09:55,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 524 transitions. [2021-05-06 11:09:55,088 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 524 transitions. Word has length 58 [2021-05-06 11:09:55,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:55,088 INFO L480 AbstractCegarLoop]: Abstraction has 442 states and 524 transitions. [2021-05-06 11:09:55,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:55,088 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 524 transitions. [2021-05-06 11:09:55,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:09:55,089 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:55,089 INFO L523 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 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] [2021-05-06 11:09:55,089 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:09:55,089 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:55,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:55,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1642798748, now seen corresponding path program 4 times [2021-05-06 11:09:55,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:55,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693165889] [2021-05-06 11:09:55,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:55,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:55,093 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:55,093 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:55,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:55,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:55,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:55,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 11:09:55,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:55,637 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 11:09:55,637 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:55,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693165889] [2021-05-06 11:09:55,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1693165889] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:55,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:55,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:09:55,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516926511] [2021-05-06 11:09:55,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:09:55,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:55,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:09:55,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:09:55,640 INFO L87 Difference]: Start difference. First operand 442 states and 524 transitions. Second operand has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:56,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:56,551 INFO L93 Difference]: Finished difference Result 474 states and 561 transitions. [2021-05-06 11:09:56,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:09:56,552 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2021-05-06 11:09:56,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:56,553 INFO L225 Difference]: With dead ends: 474 [2021-05-06 11:09:56,553 INFO L226 Difference]: Without dead ends: 472 [2021-05-06 11:09:56,554 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 794.3ms TimeCoverageRelationStatistics Valid=210, Invalid=1682, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:09:56,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-06 11:09:56,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 440. [2021-05-06 11:09:56,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 408 states have (on average 1.1838235294117647) internal successors, (483), 421 states have internal predecessors, (483), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (19), 6 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 11:09:56,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 522 transitions. [2021-05-06 11:09:56,679 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 522 transitions. Word has length 58 [2021-05-06 11:09:56,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:56,679 INFO L480 AbstractCegarLoop]: Abstraction has 440 states and 522 transitions. [2021-05-06 11:09:56,679 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:09:56,679 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 522 transitions. [2021-05-06 11:09:56,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:09:56,680 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:56,680 INFO L523 BasicCegarLoop]: trace histogram [4, 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] [2021-05-06 11:09:56,681 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:09:56,681 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:56,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:56,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1797092794, now seen corresponding path program 5 times [2021-05-06 11:09:56,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:56,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702130562] [2021-05-06 11:09:56,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:56,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:56,684 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:56,685 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:56,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:56,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:56,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:56,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-06 11:09:56,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:56,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:09:56,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:56,933 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 11:09:56,934 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:56,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702130562] [2021-05-06 11:09:56,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1702130562] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:56,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:56,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:56,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467178354] [2021-05-06 11:09:56,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:56,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:56,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:56,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:56,934 INFO L87 Difference]: Start difference. First operand 440 states and 522 transitions. Second operand has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:57,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:57,621 INFO L93 Difference]: Finished difference Result 490 states and 581 transitions. [2021-05-06 11:09:57,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:57,622 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 60 [2021-05-06 11:09:57,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:57,623 INFO L225 Difference]: With dead ends: 490 [2021-05-06 11:09:57,623 INFO L226 Difference]: Without dead ends: 488 [2021-05-06 11:09:57,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 360.6ms TimeCoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:09:57,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-05-06 11:09:57,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 449. [2021-05-06 11:09:57,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 416 states have (on average 1.1826923076923077) internal successors, (492), 430 states have internal predecessors, (492), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 6 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:57,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 533 transitions. [2021-05-06 11:09:57,752 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 533 transitions. Word has length 60 [2021-05-06 11:09:57,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:57,752 INFO L480 AbstractCegarLoop]: Abstraction has 449 states and 533 transitions. [2021-05-06 11:09:57,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:57,752 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 533 transitions. [2021-05-06 11:09:57,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:09:57,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:57,753 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:57,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:09:57,753 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:57,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:57,753 INFO L82 PathProgramCache]: Analyzing trace with hash -141469330, now seen corresponding path program 14 times [2021-05-06 11:09:57,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:57,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775976140] [2021-05-06 11:09:57,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:57,756 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:57,757 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:57,757 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:57,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:57,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:57,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:57,908 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 11:09:57,908 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:57,908 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775976140] [2021-05-06 11:09:57,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [775976140] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:57,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:57,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:57,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435859406] [2021-05-06 11:09:57,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:57,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:57,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:57,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:57,909 INFO L87 Difference]: Start difference. First operand 449 states and 533 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 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 11:09:58,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:58,628 INFO L93 Difference]: Finished difference Result 942 states and 1152 transitions. [2021-05-06 11:09:58,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:58,629 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 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 58 [2021-05-06 11:09:58,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:58,631 INFO L225 Difference]: With dead ends: 942 [2021-05-06 11:09:58,631 INFO L226 Difference]: Without dead ends: 820 [2021-05-06 11:09:58,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 269.8ms TimeCoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:58,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2021-05-06 11:09:58,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 642. [2021-05-06 11:09:58,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 642 states, 609 states have (on average 1.1986863711001643) internal successors, (730), 623 states have internal predecessors, (730), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 6 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:09:58,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642 states to 642 states and 771 transitions. [2021-05-06 11:09:58,863 INFO L78 Accepts]: Start accepts. Automaton has 642 states and 771 transitions. Word has length 58 [2021-05-06 11:09:58,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:58,863 INFO L480 AbstractCegarLoop]: Abstraction has 642 states and 771 transitions. [2021-05-06 11:09:58,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 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 11:09:58,863 INFO L276 IsEmpty]: Start isEmpty. Operand 642 states and 771 transitions. [2021-05-06 11:09:58,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:09:58,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:58,873 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:58,873 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:09:58,873 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:58,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:58,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1104308479, now seen corresponding path program 15 times [2021-05-06 11:09:58,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:58,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129469780] [2021-05-06 11:09:58,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:58,877 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:58,877 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:58,877 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:58,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:59,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:59,145 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 11:09:59,145 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:59,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129469780] [2021-05-06 11:09:59,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1129469780] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:59,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:59,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:59,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403934894] [2021-05-06 11:09:59,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:59,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:59,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:59,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:59,146 INFO L87 Difference]: Start difference. First operand 642 states and 771 transitions. Second operand has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 18 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 11:10:01,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:01,129 INFO L93 Difference]: Finished difference Result 1025 states and 1247 transitions. [2021-05-06 11:10:01,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 11:10:01,129 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 18 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 58 [2021-05-06 11:10:01,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:01,132 INFO L225 Difference]: With dead ends: 1025 [2021-05-06 11:10:01,132 INFO L226 Difference]: Without dead ends: 1023 [2021-05-06 11:10:01,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1887 ImplicationChecksByTransitivity, 961.7ms TimeCoverageRelationStatistics Valid=555, Invalid=5607, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:10:01,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2021-05-06 11:10:01,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 660. [2021-05-06 11:10:01,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 660 states, 627 states have (on average 1.2073365231259967) internal successors, (757), 641 states have internal predecessors, (757), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 6 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 11:10:01,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 660 states to 660 states and 798 transitions. [2021-05-06 11:10:01,323 INFO L78 Accepts]: Start accepts. Automaton has 660 states and 798 transitions. Word has length 58 [2021-05-06 11:10:01,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:01,323 INFO L480 AbstractCegarLoop]: Abstraction has 660 states and 798 transitions. [2021-05-06 11:10:01,323 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 2.6315789473684212) internal successors, (50), 18 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 11:10:01,323 INFO L276 IsEmpty]: Start isEmpty. Operand 660 states and 798 transitions. [2021-05-06 11:10:01,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:10:01,324 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:01,324 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:01,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:10:01,324 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:01,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:01,324 INFO L82 PathProgramCache]: Analyzing trace with hash -266865911, now seen corresponding path program 13 times [2021-05-06 11:10:01,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:01,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921791444] [2021-05-06 11:10:01,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:01,328 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:01,328 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:01,328 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:01,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:01,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:01,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:01,799 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 11:10:01,799 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:01,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921791444] [2021-05-06 11:10:01,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [921791444] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:01,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:01,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:10:01,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733017928] [2021-05-06 11:10:01,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:10:01,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:01,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:10:01,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:10:01,800 INFO L87 Difference]: Start difference. First operand 660 states and 798 transitions. Second operand has 25 states, 24 states have (on average 2.25) internal successors, (54), 23 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 11:10:04,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:04,131 INFO L93 Difference]: Finished difference Result 796 states and 961 transitions. [2021-05-06 11:10:04,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:10:04,132 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.25) internal successors, (54), 23 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 58 [2021-05-06 11:10:04,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:04,134 INFO L225 Difference]: With dead ends: 796 [2021-05-06 11:10:04,134 INFO L226 Difference]: Without dead ends: 794 [2021-05-06 11:10:04,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 3 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 1448.0ms TimeCoverageRelationStatistics Valid=482, Invalid=3940, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:10:04,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2021-05-06 11:10:04,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 661. [2021-05-06 11:10:04,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 629 states have (on average 1.206677265500795) internal successors, (759), 642 states have internal predecessors, (759), 20 states have call successors, (20), 12 states have call predecessors, (20), 11 states have return successors, (19), 6 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-06 11:10:04,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 798 transitions. [2021-05-06 11:10:04,346 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 798 transitions. Word has length 58 [2021-05-06 11:10:04,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:04,347 INFO L480 AbstractCegarLoop]: Abstraction has 661 states and 798 transitions. [2021-05-06 11:10:04,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.25) internal successors, (54), 23 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 11:10:04,347 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 798 transitions. [2021-05-06 11:10:04,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:10:04,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:04,348 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:04,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:10:04,348 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:04,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:04,349 INFO L82 PathProgramCache]: Analyzing trace with hash -441878337, now seen corresponding path program 14 times [2021-05-06 11:10:04,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:04,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173668427] [2021-05-06 11:10:04,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:04,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:04,353 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:04,354 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:04,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:05,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:05,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:05,224 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 11:10:05,224 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:05,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173668427] [2021-05-06 11:10:05,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [173668427] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:05,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:05,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:10:05,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355395242] [2021-05-06 11:10:05,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:10:05,225 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:05,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:10:05,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:10:05,225 INFO L87 Difference]: Start difference. First operand 661 states and 798 transitions. Second operand has 31 states, 30 states have (on average 1.8) internal successors, (54), 29 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 11:10:07,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:07,728 INFO L93 Difference]: Finished difference Result 868 states and 1051 transitions. [2021-05-06 11:10:07,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:10:07,728 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.8) internal successors, (54), 29 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 58 [2021-05-06 11:10:07,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:07,731 INFO L225 Difference]: With dead ends: 868 [2021-05-06 11:10:07,731 INFO L226 Difference]: Without dead ends: 866 [2021-05-06 11:10:07,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 3 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 2046.3ms TimeCoverageRelationStatistics Valid=497, Invalid=4333, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:10:07,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 866 states. [2021-05-06 11:10:07,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 866 to 680. [2021-05-06 11:10:07,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 680 states, 645 states have (on average 1.206201550387597) internal successors, (778), 660 states have internal predecessors, (778), 22 states have call successors, (22), 13 states have call predecessors, (22), 12 states have return successors, (21), 6 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 11:10:07,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 821 transitions. [2021-05-06 11:10:07,935 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 821 transitions. Word has length 58 [2021-05-06 11:10:07,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:07,936 INFO L480 AbstractCegarLoop]: Abstraction has 680 states and 821 transitions. [2021-05-06 11:10:07,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.8) internal successors, (54), 29 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 11:10:07,936 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 821 transitions. [2021-05-06 11:10:07,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 11:10:07,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:07,937 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:07,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:10:07,937 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:07,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:07,937 INFO L82 PathProgramCache]: Analyzing trace with hash 2022038101, now seen corresponding path program 15 times [2021-05-06 11:10:07,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:07,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226435502] [2021-05-06 11:10:07,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:07,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:07,943 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:07,943 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:07,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:08,437 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 11:10:08,438 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:08,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226435502] [2021-05-06 11:10:08,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1226435502] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:08,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:08,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:10:08,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590744374] [2021-05-06 11:10:08,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:10:08,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:08,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:10:08,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:10:08,438 INFO L87 Difference]: Start difference. First operand 680 states and 821 transitions. Second operand has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 11:10:10,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:10,003 INFO L93 Difference]: Finished difference Result 847 states and 1021 transitions. [2021-05-06 11:10:10,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:10:10,013 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 58 [2021-05-06 11:10:10,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:10,016 INFO L225 Difference]: With dead ends: 847 [2021-05-06 11:10:10,016 INFO L226 Difference]: Without dead ends: 845 [2021-05-06 11:10:10,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 858.8ms TimeCoverageRelationStatistics Valid=240, Invalid=1830, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:10:10,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2021-05-06 11:10:10,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 671. [2021-05-06 11:10:10,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 671 states, 636 states have (on average 1.2044025157232705) internal successors, (766), 651 states have internal predecessors, (766), 22 states have call successors, (22), 13 states have call predecessors, (22), 12 states have return successors, (21), 6 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 11:10:10,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 671 states to 671 states and 809 transitions. [2021-05-06 11:10:10,233 INFO L78 Accepts]: Start accepts. Automaton has 671 states and 809 transitions. Word has length 58 [2021-05-06 11:10:10,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:10,233 INFO L480 AbstractCegarLoop]: Abstraction has 671 states and 809 transitions. [2021-05-06 11:10:10,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 23 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 11:10:10,234 INFO L276 IsEmpty]: Start isEmpty. Operand 671 states and 809 transitions. [2021-05-06 11:10:10,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:10:10,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:10,235 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:10,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:10:10,235 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:10,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:10,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1349061435, now seen corresponding path program 6 times [2021-05-06 11:10:10,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:10,235 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877866556] [2021-05-06 11:10:10,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:10,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:10,239 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:10,240 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:10,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:10,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:10,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:10,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:10:10,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:10,832 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 11:10:10,832 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:10,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877866556] [2021-05-06 11:10:10,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1877866556] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:10,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:10,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:10:10,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645115882] [2021-05-06 11:10:10,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:10:10,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:10,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:10:10,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:10:10,833 INFO L87 Difference]: Start difference. First operand 671 states and 809 transitions. Second operand has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:12,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:12,214 INFO L93 Difference]: Finished difference Result 806 states and 969 transitions. [2021-05-06 11:10:12,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:10:12,215 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 60 [2021-05-06 11:10:12,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:12,217 INFO L225 Difference]: With dead ends: 806 [2021-05-06 11:10:12,217 INFO L226 Difference]: Without dead ends: 804 [2021-05-06 11:10:12,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 927.8ms TimeCoverageRelationStatistics Valid=229, Invalid=1841, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:10:12,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2021-05-06 11:10:12,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 697. [2021-05-06 11:10:12,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 697 states, 659 states have (on average 1.2033383915022762) internal successors, (793), 675 states have internal predecessors, (793), 24 states have call successors, (24), 14 states have call predecessors, (24), 13 states have return successors, (23), 7 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-06 11:10:12,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 840 transitions. [2021-05-06 11:10:12,445 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 840 transitions. Word has length 60 [2021-05-06 11:10:12,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:12,445 INFO L480 AbstractCegarLoop]: Abstraction has 697 states and 840 transitions. [2021-05-06 11:10:12,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:12,445 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 840 transitions. [2021-05-06 11:10:12,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:10:12,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:12,446 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:12,446 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:10:12,446 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:12,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:12,447 INFO L82 PathProgramCache]: Analyzing trace with hash 527024001, now seen corresponding path program 7 times [2021-05-06 11:10:12,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:12,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839153955] [2021-05-06 11:10:12,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:12,450 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:12,450 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:12,450 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:12,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:12,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:12,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:12,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:10:12,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:12,821 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 11:10:12,821 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:12,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839153955] [2021-05-06 11:10:12,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1839153955] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:12,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:12,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:10:12,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770072945] [2021-05-06 11:10:12,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:10:12,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:12,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:10:12,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=494, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:10:12,822 INFO L87 Difference]: Start difference. First operand 697 states and 840 transitions. Second operand has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:14,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:14,152 INFO L93 Difference]: Finished difference Result 826 states and 995 transitions. [2021-05-06 11:10:14,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:10:14,153 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 60 [2021-05-06 11:10:14,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:14,155 INFO L225 Difference]: With dead ends: 826 [2021-05-06 11:10:14,155 INFO L226 Difference]: Without dead ends: 824 [2021-05-06 11:10:14,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 681.9ms TimeCoverageRelationStatistics Valid=224, Invalid=1668, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:10:14,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 824 states. [2021-05-06 11:10:14,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 824 to 742. [2021-05-06 11:10:14,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 742 states, 702 states have (on average 1.2065527065527066) internal successors, (847), 720 states have internal predecessors, (847), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (25), 7 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-06 11:10:14,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 742 states to 742 states and 898 transitions. [2021-05-06 11:10:14,388 INFO L78 Accepts]: Start accepts. Automaton has 742 states and 898 transitions. Word has length 60 [2021-05-06 11:10:14,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:14,388 INFO L480 AbstractCegarLoop]: Abstraction has 742 states and 898 transitions. [2021-05-06 11:10:14,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:14,388 INFO L276 IsEmpty]: Start isEmpty. Operand 742 states and 898 transitions. [2021-05-06 11:10:14,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:10:14,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:14,389 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:14,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:10:14,389 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:14,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:14,389 INFO L82 PathProgramCache]: Analyzing trace with hash 117942087, now seen corresponding path program 8 times [2021-05-06 11:10:14,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:14,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740280641] [2021-05-06 11:10:14,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:14,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:14,396 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:14,397 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:14,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:14,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:10:14,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:14,846 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 11:10:14,846 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:14,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740280641] [2021-05-06 11:10:14,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1740280641] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:14,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:14,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:10:14,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393814214] [2021-05-06 11:10:14,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:10:14,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:14,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:10:14,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=576, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:10:14,847 INFO L87 Difference]: Start difference. First operand 742 states and 898 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:16,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:16,513 INFO L93 Difference]: Finished difference Result 833 states and 1004 transitions. [2021-05-06 11:10:16,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:10:16,514 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 60 [2021-05-06 11:10:16,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:16,528 INFO L225 Difference]: With dead ends: 833 [2021-05-06 11:10:16,528 INFO L226 Difference]: Without dead ends: 831 [2021-05-06 11:10:16,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 972.5ms TimeCoverageRelationStatistics Valid=288, Invalid=2262, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:10:16,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 831 states. [2021-05-06 11:10:16,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 831 to 717. [2021-05-06 11:10:16,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 717 states, 680 states have (on average 1.2088235294117646) internal successors, (822), 696 states have internal predecessors, (822), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (23), 7 states have call predecessors, (23), 23 states have call successors, (23) [2021-05-06 11:10:16,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 717 states to 717 states and 869 transitions. [2021-05-06 11:10:16,750 INFO L78 Accepts]: Start accepts. Automaton has 717 states and 869 transitions. Word has length 60 [2021-05-06 11:10:16,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:16,750 INFO L480 AbstractCegarLoop]: Abstraction has 717 states and 869 transitions. [2021-05-06 11:10:16,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:16,750 INFO L276 IsEmpty]: Start isEmpty. Operand 717 states and 869 transitions. [2021-05-06 11:10:16,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:10:16,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:16,751 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:16,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:10:16,751 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:16,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:16,751 INFO L82 PathProgramCache]: Analyzing trace with hash 470069801, now seen corresponding path program 5 times [2021-05-06 11:10:16,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:16,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925484059] [2021-05-06 11:10:16,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:16,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:16,754 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:16,755 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:16,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:17,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:17,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:17,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 11:10:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:17,492 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 11:10:17,492 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:17,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925484059] [2021-05-06 11:10:17,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [925484059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:17,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:17,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:10:17,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050719551] [2021-05-06 11:10:17,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:10:17,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:17,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:10:17,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:10:17,494 INFO L87 Difference]: Start difference. First operand 717 states and 869 transitions. Second operand has 27 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:19,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:19,500 INFO L93 Difference]: Finished difference Result 892 states and 1081 transitions. [2021-05-06 11:10:19,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:10:19,500 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 11:10:19,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:19,502 INFO L225 Difference]: With dead ends: 892 [2021-05-06 11:10:19,502 INFO L226 Difference]: Without dead ends: 890 [2021-05-06 11:10:19,503 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 6 SyntacticMatches, 10 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1045 ImplicationChecksByTransitivity, 1436.1ms TimeCoverageRelationStatistics Valid=459, Invalid=3447, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:10:19,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2021-05-06 11:10:19,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 747. [2021-05-06 11:10:19,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 709 states have (on average 1.2073342736248236) internal successors, (856), 726 states have internal predecessors, (856), 25 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 7 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 11:10:19,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 905 transitions. [2021-05-06 11:10:19,734 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 905 transitions. Word has length 61 [2021-05-06 11:10:19,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:19,734 INFO L480 AbstractCegarLoop]: Abstraction has 747 states and 905 transitions. [2021-05-06 11:10:19,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:19,734 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 905 transitions. [2021-05-06 11:10:19,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:10:19,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:19,735 INFO L523 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 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] [2021-05-06 11:10:19,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:10:19,735 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:19,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:19,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1495534305, now seen corresponding path program 6 times [2021-05-06 11:10:19,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:19,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265619785] [2021-05-06 11:10:19,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:19,745 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:19,745 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:19,746 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:19,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:20,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:20,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:20,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 11:10:20,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:20,429 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 11:10:20,429 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:20,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265619785] [2021-05-06 11:10:20,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [265619785] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:20,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:20,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:10:20,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577812243] [2021-05-06 11:10:20,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:10:20,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:20,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:10:20,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:10:20,431 INFO L87 Difference]: Start difference. First operand 747 states and 905 transitions. Second operand has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:22,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:22,947 INFO L93 Difference]: Finished difference Result 895 states and 1081 transitions. [2021-05-06 11:10:22,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:10:22,948 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2021-05-06 11:10:22,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:22,951 INFO L225 Difference]: With dead ends: 895 [2021-05-06 11:10:22,951 INFO L226 Difference]: Without dead ends: 893 [2021-05-06 11:10:22,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1241 ImplicationChecksByTransitivity, 1764.4ms TimeCoverageRelationStatistics Valid=624, Invalid=3666, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:10:22,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2021-05-06 11:10:23,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 762. [2021-05-06 11:10:23,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 724 states have (on average 1.207182320441989) internal successors, (874), 741 states have internal predecessors, (874), 25 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 7 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 11:10:23,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 923 transitions. [2021-05-06 11:10:23,203 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 923 transitions. Word has length 61 [2021-05-06 11:10:23,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:23,203 INFO L480 AbstractCegarLoop]: Abstraction has 762 states and 923 transitions. [2021-05-06 11:10:23,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:23,203 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 923 transitions. [2021-05-06 11:10:23,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:10:23,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:23,204 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:23,204 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:10:23,204 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:23,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:23,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1930573552, now seen corresponding path program 16 times [2021-05-06 11:10:23,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:23,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617006681] [2021-05-06 11:10:23,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:23,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:23,217 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:23,218 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:23,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:23,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:23,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:23,937 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 11:10:23,937 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:23,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617006681] [2021-05-06 11:10:23,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [617006681] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:23,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:23,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:10:23,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272410532] [2021-05-06 11:10:23,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:10:23,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:23,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:10:23,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:10:23,938 INFO L87 Difference]: Start difference. First operand 762 states and 923 transitions. Second operand has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 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 11:10:27,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:27,414 INFO L93 Difference]: Finished difference Result 1175 states and 1434 transitions. [2021-05-06 11:10:27,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:10:27,415 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 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 60 [2021-05-06 11:10:27,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:27,419 INFO L225 Difference]: With dead ends: 1175 [2021-05-06 11:10:27,419 INFO L226 Difference]: Without dead ends: 1173 [2021-05-06 11:10:27,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 2357.1ms TimeCoverageRelationStatistics Valid=756, Invalid=3936, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:10:27,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1173 states. [2021-05-06 11:10:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1173 to 807. [2021-05-06 11:10:27,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 807 states, 765 states have (on average 1.2078431372549019) internal successors, (924), 784 states have internal predecessors, (924), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (26), 7 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-06 11:10:27,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 807 states to 807 states and 977 transitions. [2021-05-06 11:10:27,705 INFO L78 Accepts]: Start accepts. Automaton has 807 states and 977 transitions. Word has length 60 [2021-05-06 11:10:27,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:27,705 INFO L480 AbstractCegarLoop]: Abstraction has 807 states and 977 transitions. [2021-05-06 11:10:27,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.9310344827586208) internal successors, (56), 28 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 11:10:27,705 INFO L276 IsEmpty]: Start isEmpty. Operand 807 states and 977 transitions. [2021-05-06 11:10:27,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:27,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:27,706 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 11:10:27,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:10:27,706 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:27,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:27,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1750933991, now seen corresponding path program 9 times [2021-05-06 11:10:27,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:27,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947919239] [2021-05-06 11:10:27,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:27,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:27,711 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:27,712 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:27,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:28,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-06 11:10:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:10:28,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:28,208 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 11:10:28,209 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:28,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947919239] [2021-05-06 11:10:28,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [947919239] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:28,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:28,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:10:28,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196328405] [2021-05-06 11:10:28,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:10:28,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:28,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:10:28,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:10:28,210 INFO L87 Difference]: Start difference. First operand 807 states and 977 transitions. Second operand has 24 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:29,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:29,465 INFO L93 Difference]: Finished difference Result 914 states and 1107 transitions. [2021-05-06 11:10:29,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:10:29,466 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 63 [2021-05-06 11:10:29,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:29,468 INFO L225 Difference]: With dead ends: 914 [2021-05-06 11:10:29,468 INFO L226 Difference]: Without dead ends: 912 [2021-05-06 11:10:29,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 10 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 633.5ms TimeCoverageRelationStatistics Valid=174, Invalid=1308, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:10:29,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 912 states. [2021-05-06 11:10:29,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 912 to 849. [2021-05-06 11:10:29,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 804 states have (on average 1.2077114427860696) internal successors, (971), 824 states have internal predecessors, (971), 30 states have call successors, (30), 15 states have call predecessors, (30), 14 states have return successors, (29), 9 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 11:10:29,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1030 transitions. [2021-05-06 11:10:29,753 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1030 transitions. Word has length 63 [2021-05-06 11:10:29,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:29,753 INFO L480 AbstractCegarLoop]: Abstraction has 849 states and 1030 transitions. [2021-05-06 11:10:29,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:29,754 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1030 transitions. [2021-05-06 11:10:29,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:10:29,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:29,755 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:29,755 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:10:29,755 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:29,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:29,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1961217892, now seen corresponding path program 17 times [2021-05-06 11:10:29,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:29,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113809745] [2021-05-06 11:10:29,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:29,758 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:29,758 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:29,759 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:29,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:29,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:29,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:29,840 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 11:10:29,840 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:29,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113809745] [2021-05-06 11:10:29,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1113809745] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:29,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:29,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:10:29,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254209386] [2021-05-06 11:10:29,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:10:29,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:29,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:10:29,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:10:29,841 INFO L87 Difference]: Start difference. First operand 849 states and 1030 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 11:10:30,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:30,668 INFO L93 Difference]: Finished difference Result 1070 states and 1305 transitions. [2021-05-06 11:10:30,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:10:30,673 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 61 [2021-05-06 11:10:30,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:30,676 INFO L225 Difference]: With dead ends: 1070 [2021-05-06 11:10:30,676 INFO L226 Difference]: Without dead ends: 1037 [2021-05-06 11:10:30,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 164.0ms TimeCoverageRelationStatistics Valid=327, Invalid=665, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:10:30,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2021-05-06 11:10:30,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 850. [2021-05-06 11:10:30,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 850 states, 805 states have (on average 1.204968944099379) internal successors, (970), 825 states have internal predecessors, (970), 30 states have call successors, (30), 15 states have call predecessors, (30), 14 states have return successors, (29), 9 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 11:10:30,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 850 states to 850 states and 1029 transitions. [2021-05-06 11:10:30,971 INFO L78 Accepts]: Start accepts. Automaton has 850 states and 1029 transitions. Word has length 61 [2021-05-06 11:10:30,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:30,971 INFO L480 AbstractCegarLoop]: Abstraction has 850 states and 1029 transitions. [2021-05-06 11:10:30,972 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 11:10:30,972 INFO L276 IsEmpty]: Start isEmpty. Operand 850 states and 1029 transitions. [2021-05-06 11:10:30,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:10:30,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:30,973 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:30,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:10:30,973 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:30,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:30,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1632684826, now seen corresponding path program 16 times [2021-05-06 11:10:30,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:30,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322198515] [2021-05-06 11:10:30,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:30,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:30,976 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:30,977 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:30,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:31,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:31,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:31,279 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 11:10:31,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:31,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [322198515] [2021-05-06 11:10:31,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [322198515] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:31,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:31,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:10:31,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177449924] [2021-05-06 11:10:31,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:10:31,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:31,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:10:31,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:31,280 INFO L87 Difference]: Start difference. First operand 850 states and 1029 transitions. Second operand has 22 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 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 11:10:34,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:34,022 INFO L93 Difference]: Finished difference Result 1231 states and 1496 transitions. [2021-05-06 11:10:34,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:10:34,022 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 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 61 [2021-05-06 11:10:34,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:34,026 INFO L225 Difference]: With dead ends: 1231 [2021-05-06 11:10:34,026 INFO L226 Difference]: Without dead ends: 1229 [2021-05-06 11:10:34,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1700 ImplicationChecksByTransitivity, 1045.9ms TimeCoverageRelationStatistics Valid=490, Invalid=5362, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:10:34,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1229 states. [2021-05-06 11:10:34,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1229 to 897. [2021-05-06 11:10:34,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 897 states, 849 states have (on average 1.2061248527679622) internal successors, (1024), 871 states have internal predecessors, (1024), 32 states have call successors, (32), 16 states have call predecessors, (32), 15 states have return successors, (31), 9 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 11:10:34,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 897 states to 897 states and 1087 transitions. [2021-05-06 11:10:34,355 INFO L78 Accepts]: Start accepts. Automaton has 897 states and 1087 transitions. Word has length 61 [2021-05-06 11:10:34,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:34,355 INFO L480 AbstractCegarLoop]: Abstraction has 897 states and 1087 transitions. [2021-05-06 11:10:34,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.5238095238095237) internal successors, (53), 20 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 11:10:34,355 INFO L276 IsEmpty]: Start isEmpty. Operand 897 states and 1087 transitions. [2021-05-06 11:10:34,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:10:34,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:34,356 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-05-06 11:10:34,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:10:34,356 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:34,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:34,357 INFO L82 PathProgramCache]: Analyzing trace with hash -171237983, now seen corresponding path program 5 times [2021-05-06 11:10:34,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:34,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431369455] [2021-05-06 11:10:34,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:34,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:34,360 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:34,361 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:34,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:34,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:34,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:34,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-06 11:10:34,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:34,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:10:34,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:34,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:10:34,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:34,503 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 11:10:34,503 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:34,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431369455] [2021-05-06 11:10:34,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1431369455] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:34,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:34,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:10:34,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547387232] [2021-05-06 11:10:34,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:10:34,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:34,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:10:34,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:10:34,504 INFO L87 Difference]: Start difference. First operand 897 states and 1087 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:10:35,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:35,233 INFO L93 Difference]: Finished difference Result 954 states and 1153 transitions. [2021-05-06 11:10:35,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:10:35,233 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 65 [2021-05-06 11:10:35,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:35,235 INFO L225 Difference]: With dead ends: 954 [2021-05-06 11:10:35,235 INFO L226 Difference]: Without dead ends: 871 [2021-05-06 11:10:35,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 189.4ms TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:35,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2021-05-06 11:10:35,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 821. [2021-05-06 11:10:35,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 821 states, 783 states have (on average 1.1826309067688379) internal successors, (926), 797 states have internal predecessors, (926), 26 states have call successors, (26), 12 states have call predecessors, (26), 11 states have return successors, (24), 11 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-06 11:10:35,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 821 states to 821 states and 976 transitions. [2021-05-06 11:10:35,560 INFO L78 Accepts]: Start accepts. Automaton has 821 states and 976 transitions. Word has length 65 [2021-05-06 11:10:35,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:35,560 INFO L480 AbstractCegarLoop]: Abstraction has 821 states and 976 transitions. [2021-05-06 11:10:35,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:10:35,560 INFO L276 IsEmpty]: Start isEmpty. Operand 821 states and 976 transitions. [2021-05-06 11:10:35,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:35,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:35,562 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:35,562 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:10:35,562 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:35,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:35,562 INFO L82 PathProgramCache]: Analyzing trace with hash 972338910, now seen corresponding path program 10 times [2021-05-06 11:10:35,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:35,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6425039] [2021-05-06 11:10:35,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:35,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:35,565 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:35,566 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:35,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:35,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:35,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:35,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:10:35,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:35,880 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 11:10:35,880 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:35,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6425039] [2021-05-06 11:10:35,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [6425039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:35,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:35,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:10:35,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816565933] [2021-05-06 11:10:35,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:10:35,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:35,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:10:35,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=374, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:10:35,881 INFO L87 Difference]: Start difference. First operand 821 states and 976 transitions. Second operand has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:37,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:37,668 INFO L93 Difference]: Finished difference Result 1127 states and 1350 transitions. [2021-05-06 11:10:37,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:10:37,668 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 63 [2021-05-06 11:10:37,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:37,671 INFO L225 Difference]: With dead ends: 1127 [2021-05-06 11:10:37,671 INFO L226 Difference]: Without dead ends: 1125 [2021-05-06 11:10:37,671 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 6 SyntacticMatches, 8 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 760.6ms TimeCoverageRelationStatistics Valid=313, Invalid=3227, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:10:37,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1125 states. [2021-05-06 11:10:38,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1125 to 889. [2021-05-06 11:10:38,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 889 states, 844 states have (on average 1.1812796208530805) internal successors, (997), 863 states have internal predecessors, (997), 32 states have call successors, (32), 13 states have call predecessors, (32), 12 states have return successors, (30), 12 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-06 11:10:38,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 889 states to 889 states and 1059 transitions. [2021-05-06 11:10:38,042 INFO L78 Accepts]: Start accepts. Automaton has 889 states and 1059 transitions. Word has length 63 [2021-05-06 11:10:38,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:38,042 INFO L480 AbstractCegarLoop]: Abstraction has 889 states and 1059 transitions. [2021-05-06 11:10:38,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:38,042 INFO L276 IsEmpty]: Start isEmpty. Operand 889 states and 1059 transitions. [2021-05-06 11:10:38,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:38,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:38,044 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:38,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:10:38,044 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:38,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:38,044 INFO L82 PathProgramCache]: Analyzing trace with hash 736626974, now seen corresponding path program 11 times [2021-05-06 11:10:38,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:38,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836551150] [2021-05-06 11:10:38,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:38,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:38,078 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:38,079 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:38,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:38,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:38,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:38,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:10:38,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:38,457 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 11:10:38,457 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:38,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836551150] [2021-05-06 11:10:38,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [836551150] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:38,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:38,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:10:38,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172139588] [2021-05-06 11:10:38,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:10:38,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:38,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:10:38,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=498, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:10:38,458 INFO L87 Difference]: Start difference. First operand 889 states and 1059 transitions. Second operand has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:40,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:40,967 INFO L93 Difference]: Finished difference Result 1052 states and 1254 transitions. [2021-05-06 11:10:40,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:10:40,967 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 63 [2021-05-06 11:10:40,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:40,973 INFO L225 Difference]: With dead ends: 1052 [2021-05-06 11:10:40,973 INFO L226 Difference]: Without dead ends: 1050 [2021-05-06 11:10:40,974 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 1349.0ms TimeCoverageRelationStatistics Valid=390, Invalid=3642, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:10:40,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1050 states. [2021-05-06 11:10:41,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1050 to 910. [2021-05-06 11:10:41,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 910 states, 861 states have (on average 1.1800232288037167) internal successors, (1016), 881 states have internal predecessors, (1016), 34 states have call successors, (34), 15 states have call predecessors, (34), 14 states have return successors, (32), 13 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 11:10:41,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 910 states to 910 states and 1082 transitions. [2021-05-06 11:10:41,343 INFO L78 Accepts]: Start accepts. Automaton has 910 states and 1082 transitions. Word has length 63 [2021-05-06 11:10:41,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:41,343 INFO L480 AbstractCegarLoop]: Abstraction has 910 states and 1082 transitions. [2021-05-06 11:10:41,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 22 states have internal predecessors, (57), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:41,343 INFO L276 IsEmpty]: Start isEmpty. Operand 910 states and 1082 transitions. [2021-05-06 11:10:41,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:41,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:41,344 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:41,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:10:41,344 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:41,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:41,344 INFO L82 PathProgramCache]: Analyzing trace with hash -578416814, now seen corresponding path program 12 times [2021-05-06 11:10:41,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:41,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068861839] [2021-05-06 11:10:41,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:41,351 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:41,351 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:41,352 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:41,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:41,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:41,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:41,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:10:41,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:41,789 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 11:10:41,789 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:41,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068861839] [2021-05-06 11:10:41,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2068861839] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:41,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:41,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:10:41,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417613978] [2021-05-06 11:10:41,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:10:41,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:41,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:10:41,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:10:41,790 INFO L87 Difference]: Start difference. First operand 910 states and 1082 transitions. Second operand has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:43,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:43,323 INFO L93 Difference]: Finished difference Result 978 states and 1161 transitions. [2021-05-06 11:10:43,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:10:43,324 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 63 [2021-05-06 11:10:43,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:43,326 INFO L225 Difference]: With dead ends: 978 [2021-05-06 11:10:43,326 INFO L226 Difference]: Without dead ends: 976 [2021-05-06 11:10:43,326 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 792.6ms TimeCoverageRelationStatistics Valid=224, Invalid=1938, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:10:43,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 976 states. [2021-05-06 11:10:43,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 976 to 904. [2021-05-06 11:10:43,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 855 states have (on average 1.1801169590643275) internal successors, (1009), 875 states have internal predecessors, (1009), 34 states have call successors, (34), 15 states have call predecessors, (34), 14 states have return successors, (32), 13 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-06 11:10:43,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1075 transitions. [2021-05-06 11:10:43,685 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1075 transitions. Word has length 63 [2021-05-06 11:10:43,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:43,686 INFO L480 AbstractCegarLoop]: Abstraction has 904 states and 1075 transitions. [2021-05-06 11:10:43,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:43,686 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1075 transitions. [2021-05-06 11:10:43,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:10:43,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:43,687 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 5, 4, 4, 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] [2021-05-06 11:10:43,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 11:10:43,687 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:43,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:43,687 INFO L82 PathProgramCache]: Analyzing trace with hash -645721556, now seen corresponding path program 7 times [2021-05-06 11:10:43,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:43,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120558650] [2021-05-06 11:10:43,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:43,691 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:43,691 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:43,691 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:43,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:44,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:44,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:44,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 11:10:44,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:44,562 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 11:10:44,562 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:44,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120558650] [2021-05-06 11:10:44,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [120558650] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:44,562 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:44,562 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:10:44,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136779757] [2021-05-06 11:10:44,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:10:44,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:44,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:10:44,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:10:44,563 INFO L87 Difference]: Start difference. First operand 904 states and 1075 transitions. Second operand has 32 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:46,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:46,808 INFO L93 Difference]: Finished difference Result 962 states and 1143 transitions. [2021-05-06 11:10:46,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:10:46,808 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-05-06 11:10:46,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:46,810 INFO L225 Difference]: With dead ends: 962 [2021-05-06 11:10:46,810 INFO L226 Difference]: Without dead ends: 960 [2021-05-06 11:10:46,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 1695.0ms TimeCoverageRelationStatistics Valid=414, Invalid=3492, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:10:46,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 960 states. [2021-05-06 11:10:47,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 960 to 930. [2021-05-06 11:10:47,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 930 states, 878 states have (on average 1.1799544419134396) internal successors, (1036), 899 states have internal predecessors, (1036), 36 states have call successors, (36), 16 states have call predecessors, (36), 15 states have return successors, (34), 14 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-06 11:10:47,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 930 states to 930 states and 1106 transitions. [2021-05-06 11:10:47,182 INFO L78 Accepts]: Start accepts. Automaton has 930 states and 1106 transitions. Word has length 64 [2021-05-06 11:10:47,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:47,183 INFO L480 AbstractCegarLoop]: Abstraction has 930 states and 1106 transitions. [2021-05-06 11:10:47,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:10:47,183 INFO L276 IsEmpty]: Start isEmpty. Operand 930 states and 1106 transitions. [2021-05-06 11:10:47,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:10:47,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:47,184 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:47,184 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:10:47,184 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:47,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:47,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1217741736, now seen corresponding path program 6 times [2021-05-06 11:10:47,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:47,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728100936] [2021-05-06 11:10:47,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:47,190 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:47,190 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:47,191 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:47,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:47,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:10:47,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:10:47,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:47,545 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 11:10:47,545 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:47,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728100936] [2021-05-06 11:10:47,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [728100936] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:47,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:47,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:10:47,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283996587] [2021-05-06 11:10:47,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:10:47,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:47,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:10:47,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:10:47,546 INFO L87 Difference]: Start difference. First operand 930 states and 1106 transitions. Second operand has 22 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:48,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:48,711 INFO L93 Difference]: Finished difference Result 984 states and 1171 transitions. [2021-05-06 11:10:48,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:10:48,711 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 65 [2021-05-06 11:10:48,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:48,713 INFO L225 Difference]: With dead ends: 984 [2021-05-06 11:10:48,713 INFO L226 Difference]: Without dead ends: 982 [2021-05-06 11:10:48,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 600.9ms TimeCoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:10:48,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 982 states. [2021-05-06 11:10:49,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 982 to 976. [2021-05-06 11:10:49,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 976 states, 915 states have (on average 1.1759562841530056) internal successors, (1076), 940 states have internal predecessors, (1076), 44 states have call successors, (44), 17 states have call predecessors, (44), 16 states have return successors, (42), 18 states have call predecessors, (42), 42 states have call successors, (42) [2021-05-06 11:10:49,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 976 states to 976 states and 1162 transitions. [2021-05-06 11:10:49,124 INFO L78 Accepts]: Start accepts. Automaton has 976 states and 1162 transitions. Word has length 65 [2021-05-06 11:10:49,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:49,124 INFO L480 AbstractCegarLoop]: Abstraction has 976 states and 1162 transitions. [2021-05-06 11:10:49,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:10:49,124 INFO L276 IsEmpty]: Start isEmpty. Operand 976 states and 1162 transitions. [2021-05-06 11:10:49,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:49,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:49,126 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:49,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:10:49,126 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:49,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:49,126 INFO L82 PathProgramCache]: Analyzing trace with hash 775255317, now seen corresponding path program 18 times [2021-05-06 11:10:49,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:49,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173712283] [2021-05-06 11:10:49,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:49,132 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:49,132 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:49,133 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:49,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:49,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:49,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:49,957 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 11:10:49,957 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:49,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173712283] [2021-05-06 11:10:49,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1173712283] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:49,957 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:49,957 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:10:49,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731790707] [2021-05-06 11:10:49,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:10:49,957 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:49,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:10:49,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:10:49,958 INFO L87 Difference]: Start difference. First operand 976 states and 1162 transitions. Second operand has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 11:10:52,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:52,075 INFO L93 Difference]: Finished difference Result 1337 states and 1609 transitions. [2021-05-06 11:10:52,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:10:52,075 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 63 [2021-05-06 11:10:52,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:52,077 INFO L225 Difference]: With dead ends: 1337 [2021-05-06 11:10:52,077 INFO L226 Difference]: Without dead ends: 1335 [2021-05-06 11:10:52,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 1230.6ms TimeCoverageRelationStatistics Valid=303, Invalid=2453, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:10:52,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1335 states. [2021-05-06 11:10:52,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1335 to 1039. [2021-05-06 11:10:52,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1039 states, 974 states have (on average 1.1806981519507187) internal successors, (1150), 1001 states have internal predecessors, (1150), 46 states have call successors, (46), 19 states have call predecessors, (46), 18 states have return successors, (44), 18 states have call predecessors, (44), 44 states have call successors, (44) [2021-05-06 11:10:52,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1039 states to 1039 states and 1240 transitions. [2021-05-06 11:10:52,524 INFO L78 Accepts]: Start accepts. Automaton has 1039 states and 1240 transitions. Word has length 63 [2021-05-06 11:10:52,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:52,524 INFO L480 AbstractCegarLoop]: Abstraction has 1039 states and 1240 transitions. [2021-05-06 11:10:52,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 11:10:52,524 INFO L276 IsEmpty]: Start isEmpty. Operand 1039 states and 1240 transitions. [2021-05-06 11:10:52,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:52,525 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:52,525 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:52,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 11:10:52,526 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:52,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:52,526 INFO L82 PathProgramCache]: Analyzing trace with hash 78615171, now seen corresponding path program 19 times [2021-05-06 11:10:52,526 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:52,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705988326] [2021-05-06 11:10:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:52,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:52,534 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:52,534 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:52,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:53,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:53,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:53,193 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 11:10:53,193 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:53,193 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705988326] [2021-05-06 11:10:53,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [705988326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:53,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:53,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:10:53,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048592116] [2021-05-06 11:10:53,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:10:53,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:53,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:10:53,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:10:53,194 INFO L87 Difference]: Start difference. First operand 1039 states and 1240 transitions. Second operand has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 11:10:55,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:55,967 INFO L93 Difference]: Finished difference Result 1319 states and 1584 transitions. [2021-05-06 11:10:55,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:10:55,967 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 63 [2021-05-06 11:10:55,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:55,969 INFO L225 Difference]: With dead ends: 1319 [2021-05-06 11:10:55,969 INFO L226 Difference]: Without dead ends: 1317 [2021-05-06 11:10:55,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 1399.8ms TimeCoverageRelationStatistics Valid=439, Invalid=3343, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:10:55,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1317 states. [2021-05-06 11:10:56,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1317 to 1067. [2021-05-06 11:10:56,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1067 states, 1001 states have (on average 1.1818181818181819) internal successors, (1183), 1028 states have internal predecessors, (1183), 46 states have call successors, (46), 20 states have call predecessors, (46), 19 states have return successors, (44), 18 states have call predecessors, (44), 44 states have call successors, (44) [2021-05-06 11:10:56,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1067 states to 1067 states and 1273 transitions. [2021-05-06 11:10:56,439 INFO L78 Accepts]: Start accepts. Automaton has 1067 states and 1273 transitions. Word has length 63 [2021-05-06 11:10:56,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:56,439 INFO L480 AbstractCegarLoop]: Abstraction has 1067 states and 1273 transitions. [2021-05-06 11:10:56,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 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 11:10:56,440 INFO L276 IsEmpty]: Start isEmpty. Operand 1067 states and 1273 transitions. [2021-05-06 11:10:56,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:10:56,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:56,441 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:10:56,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:10:56,441 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:56,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:56,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1108087607, now seen corresponding path program 20 times [2021-05-06 11:10:56,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:56,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055239519] [2021-05-06 11:10:56,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:56,455 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:56,455 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:56,456 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:57,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:10:57,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:10:57,286 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 11:10:57,286 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:10:57,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055239519] [2021-05-06 11:10:57,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1055239519] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:10:57,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:10:57,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:10:57,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120268680] [2021-05-06 11:10:57,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:10:57,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:10:57,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:10:57,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=965, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:10:57,287 INFO L87 Difference]: Start difference. First operand 1067 states and 1273 transitions. Second operand has 34 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 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 11:10:59,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:10:59,458 INFO L93 Difference]: Finished difference Result 1167 states and 1390 transitions. [2021-05-06 11:10:59,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:10:59,459 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 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 63 [2021-05-06 11:10:59,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:10:59,461 INFO L225 Difference]: With dead ends: 1167 [2021-05-06 11:10:59,461 INFO L226 Difference]: Without dead ends: 1165 [2021-05-06 11:10:59,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 5 SyntacticMatches, 7 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 1425.8ms TimeCoverageRelationStatistics Valid=490, Invalid=3050, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:10:59,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1165 states. [2021-05-06 11:10:59,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1165 to 1067. [2021-05-06 11:10:59,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1067 states, 1002 states have (on average 1.183632734530938) internal successors, (1186), 1028 states have internal predecessors, (1186), 45 states have call successors, (45), 20 states have call predecessors, (45), 19 states have return successors, (43), 18 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-06 11:10:59,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1067 states to 1067 states and 1274 transitions. [2021-05-06 11:10:59,917 INFO L78 Accepts]: Start accepts. Automaton has 1067 states and 1274 transitions. Word has length 63 [2021-05-06 11:10:59,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:10:59,917 INFO L480 AbstractCegarLoop]: Abstraction has 1067 states and 1274 transitions. [2021-05-06 11:10:59,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.7878787878787878) internal successors, (59), 32 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 11:10:59,917 INFO L276 IsEmpty]: Start isEmpty. Operand 1067 states and 1274 transitions. [2021-05-06 11:10:59,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:10:59,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:10:59,919 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 3, 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] [2021-05-06 11:10:59,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:10:59,919 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:10:59,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:10:59,919 INFO L82 PathProgramCache]: Analyzing trace with hash -500007896, now seen corresponding path program 8 times [2021-05-06 11:10:59,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:10:59,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155653889] [2021-05-06 11:10:59,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:10:59,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:10:59,922 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:10:59,923 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:10:59,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:00,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:00,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:00,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 11:11:00,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:00,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:00,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:00,352 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 11:11:00,352 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:00,353 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155653889] [2021-05-06 11:11:00,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [155653889] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:00,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:00,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:11:00,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981670739] [2021-05-06 11:11:00,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:11:00,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:00,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:11:00,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:11:00,353 INFO L87 Difference]: Start difference. First operand 1067 states and 1274 transitions. Second operand has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:02,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:02,230 INFO L93 Difference]: Finished difference Result 1172 states and 1396 transitions. [2021-05-06 11:11:02,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:11:02,231 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 66 [2021-05-06 11:11:02,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:02,232 INFO L225 Difference]: With dead ends: 1172 [2021-05-06 11:11:02,233 INFO L226 Difference]: Without dead ends: 1116 [2021-05-06 11:11:02,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 1065.0ms TimeCoverageRelationStatistics Valid=409, Invalid=2561, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:11:02,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2021-05-06 11:11:02,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 1017. [2021-05-06 11:11:02,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1017 states, 956 states have (on average 1.1882845188284519) internal successors, (1136), 982 states have internal predecessors, (1136), 42 states have call successors, (42), 19 states have call predecessors, (42), 18 states have return successors, (40), 15 states have call predecessors, (40), 40 states have call successors, (40) [2021-05-06 11:11:02,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1017 states to 1017 states and 1218 transitions. [2021-05-06 11:11:02,656 INFO L78 Accepts]: Start accepts. Automaton has 1017 states and 1218 transitions. Word has length 66 [2021-05-06 11:11:02,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:02,656 INFO L480 AbstractCegarLoop]: Abstraction has 1017 states and 1218 transitions. [2021-05-06 11:11:02,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:02,656 INFO L276 IsEmpty]: Start isEmpty. Operand 1017 states and 1218 transitions. [2021-05-06 11:11:02,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:02,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:02,657 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:02,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:11:02,657 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:02,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:02,658 INFO L82 PathProgramCache]: Analyzing trace with hash -683336596, now seen corresponding path program 13 times [2021-05-06 11:11:02,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:02,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [435306606] [2021-05-06 11:11:02,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:02,671 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:02,671 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:02,672 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:02,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:03,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-06 11:11:03,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:03,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:03,180 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 11:11:03,181 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:03,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [435306606] [2021-05-06 11:11:03,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [435306606] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:03,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:03,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:11:03,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507803965] [2021-05-06 11:11:03,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:11:03,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:03,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:11:03,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:11:03,181 INFO L87 Difference]: Start difference. First operand 1017 states and 1218 transitions. Second operand has 26 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:05,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:05,480 INFO L93 Difference]: Finished difference Result 1086 states and 1299 transitions. [2021-05-06 11:11:05,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:11:05,480 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 66 [2021-05-06 11:11:05,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:05,482 INFO L225 Difference]: With dead ends: 1086 [2021-05-06 11:11:05,482 INFO L226 Difference]: Without dead ends: 1041 [2021-05-06 11:11:05,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 1466.3ms TimeCoverageRelationStatistics Valid=410, Invalid=3130, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:11:05,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1041 states. [2021-05-06 11:11:05,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1041 to 992. [2021-05-06 11:11:05,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 933 states have (on average 1.1886387995712755) internal successors, (1109), 958 states have internal predecessors, (1109), 40 states have call successors, (40), 19 states have call predecessors, (40), 18 states have return successors, (38), 14 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:11:05,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1187 transitions. [2021-05-06 11:11:05,902 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1187 transitions. Word has length 66 [2021-05-06 11:11:05,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:05,902 INFO L480 AbstractCegarLoop]: Abstraction has 992 states and 1187 transitions. [2021-05-06 11:11:05,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:05,902 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1187 transitions. [2021-05-06 11:11:05,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:05,903 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:05,903 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:05,903 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:11:05,903 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:05,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:05,904 INFO L82 PathProgramCache]: Analyzing trace with hash 781141083, now seen corresponding path program 14 times [2021-05-06 11:11:05,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:05,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412164593] [2021-05-06 11:11:05,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:05,907 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:05,907 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:05,907 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:05,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:06,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:06,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:06,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:06,231 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 11:11:06,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:06,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412164593] [2021-05-06 11:11:06,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1412164593] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:06,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:06,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:11:06,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077550410] [2021-05-06 11:11:06,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:11:06,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:06,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:11:06,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:11:06,232 INFO L87 Difference]: Start difference. First operand 992 states and 1187 transitions. Second operand has 23 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:08,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:08,135 INFO L93 Difference]: Finished difference Result 1214 states and 1461 transitions. [2021-05-06 11:11:08,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:11:08,136 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 66 [2021-05-06 11:11:08,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:08,138 INFO L225 Difference]: With dead ends: 1214 [2021-05-06 11:11:08,138 INFO L226 Difference]: Without dead ends: 1212 [2021-05-06 11:11:08,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 961 ImplicationChecksByTransitivity, 894.7ms TimeCoverageRelationStatistics Valid=705, Invalid=3077, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:11:08,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1212 states. [2021-05-06 11:11:08,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1212 to 999. [2021-05-06 11:11:08,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 999 states, 940 states have (on average 1.1882978723404256) internal successors, (1117), 965 states have internal predecessors, (1117), 40 states have call successors, (40), 19 states have call predecessors, (40), 18 states have return successors, (38), 14 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:11:08,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 999 states to 999 states and 1195 transitions. [2021-05-06 11:11:08,582 INFO L78 Accepts]: Start accepts. Automaton has 999 states and 1195 transitions. Word has length 66 [2021-05-06 11:11:08,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:08,582 INFO L480 AbstractCegarLoop]: Abstraction has 999 states and 1195 transitions. [2021-05-06 11:11:08,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:08,582 INFO L276 IsEmpty]: Start isEmpty. Operand 999 states and 1195 transitions. [2021-05-06 11:11:08,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:08,583 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:08,583 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:08,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:11:08,583 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:08,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:08,584 INFO L82 PathProgramCache]: Analyzing trace with hash -907802659, now seen corresponding path program 9 times [2021-05-06 11:11:08,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:08,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553070133] [2021-05-06 11:11:08,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:08,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:08,587 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:08,587 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:08,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:08,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:08,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:08,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:08,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:08,674 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 11:11:08,674 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:08,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553070133] [2021-05-06 11:11:08,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1553070133] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:08,674 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:08,674 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:11:08,674 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52792895] [2021-05-06 11:11:08,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:11:08,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:08,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:11:08,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:11:08,675 INFO L87 Difference]: Start difference. First operand 999 states and 1195 transitions. Second operand has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:09,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:09,618 INFO L93 Difference]: Finished difference Result 1185 states and 1424 transitions. [2021-05-06 11:11:09,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:11:09,619 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 66 [2021-05-06 11:11:09,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:09,621 INFO L225 Difference]: With dead ends: 1185 [2021-05-06 11:11:09,621 INFO L226 Difference]: Without dead ends: 1144 [2021-05-06 11:11:09,621 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 198.3ms TimeCoverageRelationStatistics Valid=265, Invalid=727, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:11:09,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1144 states. [2021-05-06 11:11:10,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1144 to 1000. [2021-05-06 11:11:10,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1000 states, 941 states have (on average 1.1870350690754516) internal successors, (1117), 966 states have internal predecessors, (1117), 40 states have call successors, (40), 19 states have call predecessors, (40), 18 states have return successors, (38), 14 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:11:10,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1000 states to 1000 states and 1195 transitions. [2021-05-06 11:11:10,067 INFO L78 Accepts]: Start accepts. Automaton has 1000 states and 1195 transitions. Word has length 66 [2021-05-06 11:11:10,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:10,067 INFO L480 AbstractCegarLoop]: Abstraction has 1000 states and 1195 transitions. [2021-05-06 11:11:10,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 11 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:10,067 INFO L276 IsEmpty]: Start isEmpty. Operand 1000 states and 1195 transitions. [2021-05-06 11:11:10,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:10,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:10,068 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:10,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 11:11:10,068 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:10,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:10,068 INFO L82 PathProgramCache]: Analyzing trace with hash 958384667, now seen corresponding path program 15 times [2021-05-06 11:11:10,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:10,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699694719] [2021-05-06 11:11:10,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:10,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:10,072 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:10,072 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:10,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:10,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:10,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:10,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:10,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:10,495 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 11:11:10,496 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:10,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699694719] [2021-05-06 11:11:10,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1699694719] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:10,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:10,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:11:10,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139471219] [2021-05-06 11:11:10,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:11:10,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:10,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:11:10,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:11:10,496 INFO L87 Difference]: Start difference. First operand 1000 states and 1195 transitions. Second operand has 25 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:12,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:12,547 INFO L93 Difference]: Finished difference Result 1127 states and 1345 transitions. [2021-05-06 11:11:12,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:11:12,547 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 66 [2021-05-06 11:11:12,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:12,549 INFO L225 Difference]: With dead ends: 1127 [2021-05-06 11:11:12,549 INFO L226 Difference]: Without dead ends: 1125 [2021-05-06 11:11:12,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1023.1ms TimeCoverageRelationStatistics Valid=371, Invalid=2935, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:11:12,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1125 states. [2021-05-06 11:11:12,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1125 to 994. [2021-05-06 11:11:12,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 935 states have (on average 1.1871657754010696) internal successors, (1110), 960 states have internal predecessors, (1110), 40 states have call successors, (40), 19 states have call predecessors, (40), 18 states have return successors, (38), 14 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:11:12,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1188 transitions. [2021-05-06 11:11:12,991 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1188 transitions. Word has length 66 [2021-05-06 11:11:12,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:12,991 INFO L480 AbstractCegarLoop]: Abstraction has 994 states and 1188 transitions. [2021-05-06 11:11:12,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:12,991 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1188 transitions. [2021-05-06 11:11:12,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:12,992 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:12,992 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:12,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:11:12,992 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:12,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:12,993 INFO L82 PathProgramCache]: Analyzing trace with hash -614168551, now seen corresponding path program 10 times [2021-05-06 11:11:12,993 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:12,993 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001851012] [2021-05-06 11:11:12,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:12,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:12,996 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:12,997 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:13,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:13,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:13,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:11:13,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:13,739 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 11:11:13,739 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:13,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001851012] [2021-05-06 11:11:13,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2001851012] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:13,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:13,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:11:13,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974113113] [2021-05-06 11:11:13,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:11:13,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:13,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:11:13,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=985, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:11:13,740 INFO L87 Difference]: Start difference. First operand 994 states and 1188 transitions. Second operand has 34 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 32 states have internal predecessors, (60), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:16,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:16,561 INFO L93 Difference]: Finished difference Result 1204 states and 1441 transitions. [2021-05-06 11:11:16,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:11:16,561 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 32 states have internal predecessors, (60), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 66 [2021-05-06 11:11:16,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:16,563 INFO L225 Difference]: With dead ends: 1204 [2021-05-06 11:11:16,563 INFO L226 Difference]: Without dead ends: 1202 [2021-05-06 11:11:16,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1765 ImplicationChecksByTransitivity, 1906.5ms TimeCoverageRelationStatistics Valid=551, Invalid=5455, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:11:16,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1202 states. [2021-05-06 11:11:17,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1202 to 981. [2021-05-06 11:11:17,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 981 states, 922 states have (on average 1.185466377440347) internal successors, (1093), 946 states have internal predecessors, (1093), 40 states have call successors, (40), 19 states have call predecessors, (40), 18 states have return successors, (38), 15 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:11:17,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 981 states to 981 states and 1171 transitions. [2021-05-06 11:11:17,007 INFO L78 Accepts]: Start accepts. Automaton has 981 states and 1171 transitions. Word has length 66 [2021-05-06 11:11:17,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:17,007 INFO L480 AbstractCegarLoop]: Abstraction has 981 states and 1171 transitions. [2021-05-06 11:11:17,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.8181818181818181) internal successors, (60), 32 states have internal predecessors, (60), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:11:17,007 INFO L276 IsEmpty]: Start isEmpty. Operand 981 states and 1171 transitions. [2021-05-06 11:11:17,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:11:17,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:17,008 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:17,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:11:17,008 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:17,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:17,009 INFO L82 PathProgramCache]: Analyzing trace with hash -275259755, now seen corresponding path program 16 times [2021-05-06 11:11:17,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:17,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126561096] [2021-05-06 11:11:17,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:17,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:17,012 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:17,012 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:17,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:17,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:11:17,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:11:17,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:17,300 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 11:11:17,300 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:17,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126561096] [2021-05-06 11:11:17,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1126561096] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:17,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:17,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:11:17,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520931604] [2021-05-06 11:11:17,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:11:17,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:17,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:11:17,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:11:17,301 INFO L87 Difference]: Start difference. First operand 981 states and 1171 transitions. Second operand has 21 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:18,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:18,940 INFO L93 Difference]: Finished difference Result 1215 states and 1459 transitions. [2021-05-06 11:11:18,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:11:18,942 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 68 [2021-05-06 11:11:18,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:18,946 INFO L225 Difference]: With dead ends: 1215 [2021-05-06 11:11:18,946 INFO L226 Difference]: Without dead ends: 1213 [2021-05-06 11:11:18,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 619.7ms TimeCoverageRelationStatistics Valid=264, Invalid=1898, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:11:18,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2021-05-06 11:11:19,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1061. [2021-05-06 11:11:19,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1061 states, 988 states have (on average 1.1791497975708503) internal successors, (1165), 1020 states have internal predecessors, (1165), 53 states have call successors, (53), 20 states have call predecessors, (53), 19 states have return successors, (51), 20 states have call predecessors, (51), 51 states have call successors, (51) [2021-05-06 11:11:19,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1061 states to 1061 states and 1269 transitions. [2021-05-06 11:11:19,481 INFO L78 Accepts]: Start accepts. Automaton has 1061 states and 1269 transitions. Word has length 68 [2021-05-06 11:11:19,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:19,482 INFO L480 AbstractCegarLoop]: Abstraction has 1061 states and 1269 transitions. [2021-05-06 11:11:19,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:19,482 INFO L276 IsEmpty]: Start isEmpty. Operand 1061 states and 1269 transitions. [2021-05-06 11:11:19,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:11:19,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:19,483 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:19,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 11:11:19,483 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:19,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:19,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1734012123, now seen corresponding path program 17 times [2021-05-06 11:11:19,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:19,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696205028] [2021-05-06 11:11:19,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:19,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:19,487 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:19,487 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:19,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:19,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:19,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:19,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:11:19,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:19,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:11:19,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:19,902 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 11:11:19,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:19,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696205028] [2021-05-06 11:11:19,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1696205028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:19,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:19,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:11:19,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715925699] [2021-05-06 11:11:19,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:11:19,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:19,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:11:19,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:11:19,903 INFO L87 Difference]: Start difference. First operand 1061 states and 1269 transitions. Second operand has 24 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:21,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:21,240 INFO L93 Difference]: Finished difference Result 1131 states and 1349 transitions. [2021-05-06 11:11:21,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:11:21,241 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 68 [2021-05-06 11:11:21,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:21,242 INFO L225 Difference]: With dead ends: 1131 [2021-05-06 11:11:21,243 INFO L226 Difference]: Without dead ends: 1129 [2021-05-06 11:11:21,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 8 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 577.0ms TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:11:21,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1129 states. [2021-05-06 11:11:21,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1129 to 1061. [2021-05-06 11:11:21,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1061 states, 988 states have (on average 1.1791497975708503) internal successors, (1165), 1020 states have internal predecessors, (1165), 53 states have call successors, (53), 20 states have call predecessors, (53), 19 states have return successors, (51), 20 states have call predecessors, (51), 51 states have call successors, (51) [2021-05-06 11:11:21,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1061 states to 1061 states and 1269 transitions. [2021-05-06 11:11:21,760 INFO L78 Accepts]: Start accepts. Automaton has 1061 states and 1269 transitions. Word has length 68 [2021-05-06 11:11:21,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:21,760 INFO L480 AbstractCegarLoop]: Abstraction has 1061 states and 1269 transitions. [2021-05-06 11:11:21,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 2.590909090909091) internal successors, (57), 22 states have internal predecessors, (57), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:11:21,761 INFO L276 IsEmpty]: Start isEmpty. Operand 1061 states and 1269 transitions. [2021-05-06 11:11:21,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:21,762 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:21,762 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:21,762 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:11:21,762 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:21,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:21,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1737340720, now seen corresponding path program 21 times [2021-05-06 11:11:21,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:21,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278107820] [2021-05-06 11:11:21,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:21,766 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:21,766 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:21,766 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:21,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:22,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:22,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:22,739 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 11:11:22,739 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:22,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278107820] [2021-05-06 11:11:22,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [278107820] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:22,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:22,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:11:22,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356899478] [2021-05-06 11:11:22,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:11:22,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:22,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:11:22,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=816, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:11:22,740 INFO L87 Difference]: Start difference. First operand 1061 states and 1269 transitions. Second operand has 31 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 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 11:11:25,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:25,514 INFO L93 Difference]: Finished difference Result 1484 states and 1787 transitions. [2021-05-06 11:11:25,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:11:25,514 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 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 66 [2021-05-06 11:11:25,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:25,517 INFO L225 Difference]: With dead ends: 1484 [2021-05-06 11:11:25,517 INFO L226 Difference]: Without dead ends: 1482 [2021-05-06 11:11:25,517 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 5 SyntacticMatches, 8 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 1575.6ms TimeCoverageRelationStatistics Valid=351, Invalid=3189, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:11:25,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1482 states. [2021-05-06 11:11:26,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1482 to 1082. [2021-05-06 11:11:26,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1082 states, 1005 states have (on average 1.1771144278606964) internal successors, (1183), 1039 states have internal predecessors, (1183), 55 states have call successors, (55), 22 states have call predecessors, (55), 21 states have return successors, (53), 20 states have call predecessors, (53), 53 states have call successors, (53) [2021-05-06 11:11:26,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1082 states to 1082 states and 1291 transitions. [2021-05-06 11:11:26,057 INFO L78 Accepts]: Start accepts. Automaton has 1082 states and 1291 transitions. Word has length 66 [2021-05-06 11:11:26,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:26,058 INFO L480 AbstractCegarLoop]: Abstraction has 1082 states and 1291 transitions. [2021-05-06 11:11:26,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.066666666666667) internal successors, (62), 29 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 11:11:26,058 INFO L276 IsEmpty]: Start isEmpty. Operand 1082 states and 1291 transitions. [2021-05-06 11:11:26,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:26,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:26,059 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:26,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:11:26,059 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:26,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:26,059 INFO L82 PathProgramCache]: Analyzing trace with hash 688449750, now seen corresponding path program 22 times [2021-05-06 11:11:26,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:26,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002273334] [2021-05-06 11:11:26,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:26,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:26,063 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:26,063 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:26,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:26,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:26,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:26,570 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 11:11:26,570 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:26,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002273334] [2021-05-06 11:11:26,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1002273334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:26,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:26,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:11:26,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429107331] [2021-05-06 11:11:26,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:11:26,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:26,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:11:26,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:11:26,571 INFO L87 Difference]: Start difference. First operand 1082 states and 1291 transitions. Second operand has 28 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 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 11:11:29,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:29,223 INFO L93 Difference]: Finished difference Result 1345 states and 1614 transitions. [2021-05-06 11:11:29,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:11:29,223 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 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 66 [2021-05-06 11:11:29,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:29,226 INFO L225 Difference]: With dead ends: 1345 [2021-05-06 11:11:29,226 INFO L226 Difference]: Without dead ends: 1343 [2021-05-06 11:11:29,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 1266.6ms TimeCoverageRelationStatistics Valid=572, Invalid=3718, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:11:29,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1343 states. [2021-05-06 11:11:29,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1343 to 1094. [2021-05-06 11:11:29,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1094 states, 1015 states have (on average 1.1773399014778325) internal successors, (1195), 1050 states have internal predecessors, (1195), 56 states have call successors, (56), 23 states have call predecessors, (56), 22 states have return successors, (54), 20 states have call predecessors, (54), 54 states have call successors, (54) [2021-05-06 11:11:29,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1094 states to 1094 states and 1305 transitions. [2021-05-06 11:11:29,776 INFO L78 Accepts]: Start accepts. Automaton has 1094 states and 1305 transitions. Word has length 66 [2021-05-06 11:11:29,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:29,777 INFO L480 AbstractCegarLoop]: Abstraction has 1094 states and 1305 transitions. [2021-05-06 11:11:29,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.2962962962962963) internal successors, (62), 26 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 11:11:29,777 INFO L276 IsEmpty]: Start isEmpty. Operand 1094 states and 1305 transitions. [2021-05-06 11:11:29,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:29,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:29,778 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:29,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 11:11:29,778 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:29,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:29,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1136950192, now seen corresponding path program 23 times [2021-05-06 11:11:29,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:29,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269866636] [2021-05-06 11:11:29,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:29,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:29,782 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:29,782 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:29,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:30,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:30,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:30,364 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 11:11:30,364 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:30,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269866636] [2021-05-06 11:11:30,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1269866636] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:30,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:30,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:11:30,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458514573] [2021-05-06 11:11:30,365 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:11:30,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:30,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:11:30,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:11:30,365 INFO L87 Difference]: Start difference. First operand 1094 states and 1305 transitions. Second operand has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 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 11:11:32,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:32,998 INFO L93 Difference]: Finished difference Result 1363 states and 1636 transitions. [2021-05-06 11:11:32,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:11:32,998 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 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 66 [2021-05-06 11:11:32,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:33,000 INFO L225 Difference]: With dead ends: 1363 [2021-05-06 11:11:33,000 INFO L226 Difference]: Without dead ends: 1361 [2021-05-06 11:11:33,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 3 SyntacticMatches, 4 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 753 ImplicationChecksByTransitivity, 1397.7ms TimeCoverageRelationStatistics Valid=440, Invalid=2982, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:11:33,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1361 states. [2021-05-06 11:11:33,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1361 to 1113. [2021-05-06 11:11:33,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1113 states, 1032 states have (on average 1.177325581395349) internal successors, (1215), 1068 states have internal predecessors, (1215), 57 states have call successors, (57), 24 states have call predecessors, (57), 23 states have return successors, (55), 20 states have call predecessors, (55), 55 states have call successors, (55) [2021-05-06 11:11:33,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1113 states to 1113 states and 1327 transitions. [2021-05-06 11:11:33,560 INFO L78 Accepts]: Start accepts. Automaton has 1113 states and 1327 transitions. Word has length 66 [2021-05-06 11:11:33,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:33,561 INFO L480 AbstractCegarLoop]: Abstraction has 1113 states and 1327 transitions. [2021-05-06 11:11:33,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 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 11:11:33,561 INFO L276 IsEmpty]: Start isEmpty. Operand 1113 states and 1327 transitions. [2021-05-06 11:11:33,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:33,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:33,562 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:33,562 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:11:33,562 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:33,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:33,562 INFO L82 PathProgramCache]: Analyzing trace with hash -2061955934, now seen corresponding path program 24 times [2021-05-06 11:11:33,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:33,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903545523] [2021-05-06 11:11:33,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:33,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:33,566 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:33,566 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:33,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:34,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:34,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:34,216 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 11:11:34,216 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:34,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903545523] [2021-05-06 11:11:34,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [903545523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:34,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:34,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:11:34,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135567072] [2021-05-06 11:11:34,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:11:34,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:34,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:11:34,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:11:34,217 INFO L87 Difference]: Start difference. First operand 1113 states and 1327 transitions. Second operand has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 11:11:37,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:37,343 INFO L93 Difference]: Finished difference Result 1461 states and 1755 transitions. [2021-05-06 11:11:37,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:11:37,345 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 66 [2021-05-06 11:11:37,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:37,347 INFO L225 Difference]: With dead ends: 1461 [2021-05-06 11:11:37,347 INFO L226 Difference]: Without dead ends: 1459 [2021-05-06 11:11:37,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 1337.5ms TimeCoverageRelationStatistics Valid=361, Invalid=3179, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:11:37,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1459 states. [2021-05-06 11:11:37,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1459 to 1163. [2021-05-06 11:11:37,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1163 states, 1078 states have (on average 1.1799628942486085) internal successors, (1272), 1116 states have internal predecessors, (1272), 59 states have call successors, (59), 26 states have call predecessors, (59), 25 states have return successors, (57), 20 states have call predecessors, (57), 57 states have call successors, (57) [2021-05-06 11:11:37,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1163 states to 1163 states and 1388 transitions. [2021-05-06 11:11:37,944 INFO L78 Accepts]: Start accepts. Automaton has 1163 states and 1388 transitions. Word has length 66 [2021-05-06 11:11:37,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:37,944 INFO L480 AbstractCegarLoop]: Abstraction has 1163 states and 1388 transitions. [2021-05-06 11:11:37,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 11:11:37,944 INFO L276 IsEmpty]: Start isEmpty. Operand 1163 states and 1388 transitions. [2021-05-06 11:11:37,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:37,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:37,945 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:37,946 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:11:37,946 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:37,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:37,946 INFO L82 PathProgramCache]: Analyzing trace with hash 146305884, now seen corresponding path program 25 times [2021-05-06 11:11:37,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:37,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241138262] [2021-05-06 11:11:37,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:37,953 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:37,953 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:37,954 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:37,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:38,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:38,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:38,708 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 11:11:38,708 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:38,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241138262] [2021-05-06 11:11:38,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [241138262] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:38,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:38,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:11:38,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636207432] [2021-05-06 11:11:38,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:11:38,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:38,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:11:38,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=951, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:11:38,709 INFO L87 Difference]: Start difference. First operand 1163 states and 1388 transitions. Second operand has 34 states, 33 states have (on average 1.878787878787879) internal successors, (62), 32 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 11:11:40,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:40,993 INFO L93 Difference]: Finished difference Result 1278 states and 1521 transitions. [2021-05-06 11:11:40,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:11:40,993 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.878787878787879) internal successors, (62), 32 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 66 [2021-05-06 11:11:40,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:40,995 INFO L225 Difference]: With dead ends: 1278 [2021-05-06 11:11:40,995 INFO L226 Difference]: Without dead ends: 1276 [2021-05-06 11:11:40,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 5 SyntacticMatches, 6 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1143 ImplicationChecksByTransitivity, 1386.9ms TimeCoverageRelationStatistics Valid=553, Invalid=3737, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:11:40,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1276 states. [2021-05-06 11:11:41,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1276 to 1144. [2021-05-06 11:11:41,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1144 states, 1060 states have (on average 1.179245283018868) internal successors, (1250), 1097 states have internal predecessors, (1250), 58 states have call successors, (58), 26 states have call predecessors, (58), 25 states have return successors, (56), 20 states have call predecessors, (56), 56 states have call successors, (56) [2021-05-06 11:11:41,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1364 transitions. [2021-05-06 11:11:41,573 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1364 transitions. Word has length 66 [2021-05-06 11:11:41,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:41,573 INFO L480 AbstractCegarLoop]: Abstraction has 1144 states and 1364 transitions. [2021-05-06 11:11:41,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.878787878787879) internal successors, (62), 32 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 11:11:41,573 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1364 transitions. [2021-05-06 11:11:41,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:41,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:41,574 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:41,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 11:11:41,574 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:41,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:41,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1811130830, now seen corresponding path program 17 times [2021-05-06 11:11:41,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:41,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219417925] [2021-05-06 11:11:41,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:41,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:41,578 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:41,578 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:42,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:42,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:42,563 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 11:11:42,563 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:42,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219417925] [2021-05-06 11:11:42,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [219417925] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:42,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:42,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:11:42,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429693827] [2021-05-06 11:11:42,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:11:42,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:42,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:11:42,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=924, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:11:42,564 INFO L87 Difference]: Start difference. First operand 1144 states and 1364 transitions. Second operand has 33 states, 32 states have (on average 1.9375) internal successors, (62), 31 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 11:11:45,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:45,586 INFO L93 Difference]: Finished difference Result 1448 states and 1739 transitions. [2021-05-06 11:11:45,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:11:45,587 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.9375) internal successors, (62), 31 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 66 [2021-05-06 11:11:45,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:45,604 INFO L225 Difference]: With dead ends: 1448 [2021-05-06 11:11:45,605 INFO L226 Difference]: Without dead ends: 1446 [2021-05-06 11:11:45,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 1963.4ms TimeCoverageRelationStatistics Valid=565, Invalid=3857, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:11:45,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2021-05-06 11:11:46,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1169. [2021-05-06 11:11:46,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1169 states, 1084 states have (on average 1.1808118081180812) internal successors, (1280), 1121 states have internal predecessors, (1280), 58 states have call successors, (58), 27 states have call predecessors, (58), 26 states have return successors, (56), 20 states have call predecessors, (56), 56 states have call successors, (56) [2021-05-06 11:11:46,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1169 states to 1169 states and 1394 transitions. [2021-05-06 11:11:46,229 INFO L78 Accepts]: Start accepts. Automaton has 1169 states and 1394 transitions. Word has length 66 [2021-05-06 11:11:46,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:46,229 INFO L480 AbstractCegarLoop]: Abstraction has 1169 states and 1394 transitions. [2021-05-06 11:11:46,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.9375) internal successors, (62), 31 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 11:11:46,229 INFO L276 IsEmpty]: Start isEmpty. Operand 1169 states and 1394 transitions. [2021-05-06 11:11:46,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:46,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:46,231 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:46,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:11:46,231 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:46,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:46,231 INFO L82 PathProgramCache]: Analyzing trace with hash -337327382, now seen corresponding path program 18 times [2021-05-06 11:11:46,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:46,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162984181] [2021-05-06 11:11:46,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:46,235 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:46,235 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:46,236 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:46,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:46,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:46,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:46,852 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 11:11:46,852 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:46,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162984181] [2021-05-06 11:11:46,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1162984181] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:46,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:46,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:11:46,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29120238] [2021-05-06 11:11:46,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:11:46,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:46,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:11:46,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:11:46,853 INFO L87 Difference]: Start difference. First operand 1169 states and 1394 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:48,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:48,573 INFO L93 Difference]: Finished difference Result 1288 states and 1532 transitions. [2021-05-06 11:11:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:11:48,574 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 66 [2021-05-06 11:11:48,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:48,581 INFO L225 Difference]: With dead ends: 1288 [2021-05-06 11:11:48,582 INFO L226 Difference]: Without dead ends: 1286 [2021-05-06 11:11:48,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 931.9ms TimeCoverageRelationStatistics Valid=366, Invalid=1890, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:11:48,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1286 states. [2021-05-06 11:11:49,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1286 to 1188. [2021-05-06 11:11:49,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1188 states, 1102 states have (on average 1.1823956442831216) internal successors, (1303), 1139 states have internal predecessors, (1303), 58 states have call successors, (58), 28 states have call predecessors, (58), 27 states have return successors, (56), 20 states have call predecessors, (56), 56 states have call successors, (56) [2021-05-06 11:11:49,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1188 states to 1188 states and 1417 transitions. [2021-05-06 11:11:49,204 INFO L78 Accepts]: Start accepts. Automaton has 1188 states and 1417 transitions. Word has length 66 [2021-05-06 11:11:49,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:49,204 INFO L480 AbstractCegarLoop]: Abstraction has 1188 states and 1417 transitions. [2021-05-06 11:11:49,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:49,205 INFO L276 IsEmpty]: Start isEmpty. Operand 1188 states and 1417 transitions. [2021-05-06 11:11:49,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:49,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:49,206 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:49,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:11:49,206 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:49,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:49,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1584291114, now seen corresponding path program 19 times [2021-05-06 11:11:49,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:49,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588011393] [2021-05-06 11:11:49,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:49,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:49,210 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:49,210 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:49,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:49,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:49,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:49,780 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 11:11:49,780 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:49,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588011393] [2021-05-06 11:11:49,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1588011393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:49,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:49,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:11:49,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418899980] [2021-05-06 11:11:49,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:11:49,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:49,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:11:49,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:11:49,781 INFO L87 Difference]: Start difference. First operand 1188 states and 1417 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:51,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:51,880 INFO L93 Difference]: Finished difference Result 1316 states and 1566 transitions. [2021-05-06 11:11:51,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:11:51,881 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 66 [2021-05-06 11:11:51,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:51,883 INFO L225 Difference]: With dead ends: 1316 [2021-05-06 11:11:51,883 INFO L226 Difference]: Without dead ends: 1314 [2021-05-06 11:11:51,883 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 1030.8ms TimeCoverageRelationStatistics Valid=330, Invalid=2322, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:11:51,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1314 states. [2021-05-06 11:11:52,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1314 to 1188. [2021-05-06 11:11:52,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1188 states, 1102 states have (on average 1.1823956442831216) internal successors, (1303), 1139 states have internal predecessors, (1303), 58 states have call successors, (58), 28 states have call predecessors, (58), 27 states have return successors, (56), 20 states have call predecessors, (56), 56 states have call successors, (56) [2021-05-06 11:11:52,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1188 states to 1188 states and 1417 transitions. [2021-05-06 11:11:52,512 INFO L78 Accepts]: Start accepts. Automaton has 1188 states and 1417 transitions. Word has length 66 [2021-05-06 11:11:52,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:52,512 INFO L480 AbstractCegarLoop]: Abstraction has 1188 states and 1417 transitions. [2021-05-06 11:11:52,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:52,512 INFO L276 IsEmpty]: Start isEmpty. Operand 1188 states and 1417 transitions. [2021-05-06 11:11:52,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:52,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:52,513 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:52,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:11:52,513 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:52,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:52,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1237330082, now seen corresponding path program 20 times [2021-05-06 11:11:52,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:52,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032878587] [2021-05-06 11:11:52,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:52,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:52,518 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:52,518 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:52,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:53,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:53,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:53,043 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 11:11:53,043 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:53,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2032878587] [2021-05-06 11:11:53,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2032878587] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:53,043 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:53,043 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:11:53,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127219534] [2021-05-06 11:11:53,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:11:53,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:53,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:11:53,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:11:53,044 INFO L87 Difference]: Start difference. First operand 1188 states and 1417 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:54,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:54,768 INFO L93 Difference]: Finished difference Result 1307 states and 1551 transitions. [2021-05-06 11:11:54,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:11:54,768 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 66 [2021-05-06 11:11:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:54,770 INFO L225 Difference]: With dead ends: 1307 [2021-05-06 11:11:54,770 INFO L226 Difference]: Without dead ends: 1305 [2021-05-06 11:11:54,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 883.2ms TimeCoverageRelationStatistics Valid=282, Invalid=1788, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:11:54,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1305 states. [2021-05-06 11:11:55,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1305 to 1167. [2021-05-06 11:11:55,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1167 states, 1083 states have (on average 1.1809787626962143) internal successors, (1279), 1118 states have internal predecessors, (1279), 56 states have call successors, (56), 28 states have call predecessors, (56), 27 states have return successors, (54), 20 states have call predecessors, (54), 54 states have call successors, (54) [2021-05-06 11:11:55,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1167 states to 1167 states and 1389 transitions. [2021-05-06 11:11:55,368 INFO L78 Accepts]: Start accepts. Automaton has 1167 states and 1389 transitions. Word has length 66 [2021-05-06 11:11:55,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:55,369 INFO L480 AbstractCegarLoop]: Abstraction has 1167 states and 1389 transitions. [2021-05-06 11:11:55,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:55,369 INFO L276 IsEmpty]: Start isEmpty. Operand 1167 states and 1389 transitions. [2021-05-06 11:11:55,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:11:55,370 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:55,370 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:11:55,370 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:11:55,370 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:55,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:55,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1870934436, now seen corresponding path program 21 times [2021-05-06 11:11:55,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:55,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16754906] [2021-05-06 11:11:55,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:55,374 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:55,374 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:55,375 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:55,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:55,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:55,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:55,970 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 11:11:55,970 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:55,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16754906] [2021-05-06 11:11:55,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [16754906] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:55,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:55,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:11:55,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957676209] [2021-05-06 11:11:55,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:11:55,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:55,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:11:55,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:11:55,971 INFO L87 Difference]: Start difference. First operand 1167 states and 1389 transitions. Second operand has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:57,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:11:57,702 INFO L93 Difference]: Finished difference Result 1317 states and 1566 transitions. [2021-05-06 11:11:57,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:11:57,703 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 66 [2021-05-06 11:11:57,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:11:57,721 INFO L225 Difference]: With dead ends: 1317 [2021-05-06 11:11:57,721 INFO L226 Difference]: Without dead ends: 1315 [2021-05-06 11:11:57,722 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 536 ImplicationChecksByTransitivity, 940.3ms TimeCoverageRelationStatistics Valid=284, Invalid=1786, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:11:57,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2021-05-06 11:11:58,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1158. [2021-05-06 11:11:58,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1158 states, 1075 states have (on average 1.1813953488372093) internal successors, (1270), 1109 states have internal predecessors, (1270), 55 states have call successors, (55), 28 states have call predecessors, (55), 27 states have return successors, (53), 20 states have call predecessors, (53), 53 states have call successors, (53) [2021-05-06 11:11:58,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1158 states to 1158 states and 1378 transitions. [2021-05-06 11:11:58,513 INFO L78 Accepts]: Start accepts. Automaton has 1158 states and 1378 transitions. Word has length 66 [2021-05-06 11:11:58,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:11:58,513 INFO L480 AbstractCegarLoop]: Abstraction has 1158 states and 1378 transitions. [2021-05-06 11:11:58,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.074074074074074) internal successors, (56), 26 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 11:11:58,513 INFO L276 IsEmpty]: Start isEmpty. Operand 1158 states and 1378 transitions. [2021-05-06 11:11:58,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:11:58,514 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:11:58,515 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 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] [2021-05-06 11:11:58,515 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:11:58,515 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:11:58,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:11:58,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1360968119, now seen corresponding path program 11 times [2021-05-06 11:11:58,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:11:58,515 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774238325] [2021-05-06 11:11:58,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:11:58,531 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:11:58,531 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:11:58,531 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:58,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:11:59,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-06 11:11:59,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:11:59,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:59,541 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 11:11:59,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:11:59,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774238325] [2021-05-06 11:11:59,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1774238325] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:11:59,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:11:59,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:11:59,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104871072] [2021-05-06 11:11:59,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:11:59,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:11:59,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:11:59,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=936, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:11:59,542 INFO L87 Difference]: Start difference. First operand 1158 states and 1378 transitions. Second operand has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:12:03,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:03,060 INFO L93 Difference]: Finished difference Result 1276 states and 1512 transitions. [2021-05-06 11:12:03,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:12:03,062 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-05-06 11:12:03,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:03,064 INFO L225 Difference]: With dead ends: 1276 [2021-05-06 11:12:03,064 INFO L226 Difference]: Without dead ends: 1260 [2021-05-06 11:12:03,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2082 ImplicationChecksByTransitivity, 2545.0ms TimeCoverageRelationStatistics Valid=651, Invalid=6321, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:12:03,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1260 states. [2021-05-06 11:12:03,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1260 to 1218. [2021-05-06 11:12:03,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1218 states, 1134 states have (on average 1.1790123456790123) internal successors, (1337), 1169 states have internal predecessors, (1337), 56 states have call successors, (56), 28 states have call predecessors, (56), 27 states have return successors, (54), 20 states have call predecessors, (54), 54 states have call successors, (54) [2021-05-06 11:12:03,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1447 transitions. [2021-05-06 11:12:03,678 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1447 transitions. Word has length 69 [2021-05-06 11:12:03,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:03,678 INFO L480 AbstractCegarLoop]: Abstraction has 1218 states and 1447 transitions. [2021-05-06 11:12:03,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:12:03,678 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1447 transitions. [2021-05-06 11:12:03,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:12:03,680 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:03,680 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:03,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2021-05-06 11:12:03,680 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:03,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:03,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1404533430, now seen corresponding path program 18 times [2021-05-06 11:12:03,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:03,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954876481] [2021-05-06 11:12:03,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:03,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:03,684 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:03,684 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:03,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:04,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:04,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:04,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:12:04,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:04,187 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 11:12:04,187 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:04,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954876481] [2021-05-06 11:12:04,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [954876481] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:04,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:04,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:12:04,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595840840] [2021-05-06 11:12:04,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:12:04,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:04,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:12:04,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:12:04,188 INFO L87 Difference]: Start difference. First operand 1218 states and 1447 transitions. Second operand has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:06,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:06,617 INFO L93 Difference]: Finished difference Result 1516 states and 1816 transitions. [2021-05-06 11:12:06,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:12:06,617 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 68 [2021-05-06 11:12:06,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:06,620 INFO L225 Difference]: With dead ends: 1516 [2021-05-06 11:12:06,620 INFO L226 Difference]: Without dead ends: 1514 [2021-05-06 11:12:06,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 972.4ms TimeCoverageRelationStatistics Valid=321, Invalid=2541, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:12:06,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2021-05-06 11:12:07,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1076. [2021-05-06 11:12:07,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1076 states, 1022 states have (on average 1.1937377690802349) internal successors, (1220), 1043 states have internal predecessors, (1220), 35 states have call successors, (35), 19 states have call predecessors, (35), 18 states have return successors, (33), 13 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-06 11:12:07,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1076 states to 1076 states and 1288 transitions. [2021-05-06 11:12:07,149 INFO L78 Accepts]: Start accepts. Automaton has 1076 states and 1288 transitions. Word has length 68 [2021-05-06 11:12:07,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:07,149 INFO L480 AbstractCegarLoop]: Abstraction has 1076 states and 1288 transitions. [2021-05-06 11:12:07,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:07,149 INFO L276 IsEmpty]: Start isEmpty. Operand 1076 states and 1288 transitions. [2021-05-06 11:12:07,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:12:07,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:07,150 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:07,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:12:07,150 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:07,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:07,151 INFO L82 PathProgramCache]: Analyzing trace with hash 2068396432, now seen corresponding path program 19 times [2021-05-06 11:12:07,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:07,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965451346] [2021-05-06 11:12:07,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:07,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:07,154 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:07,155 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:07,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:07,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:07,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:07,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:12:07,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:07,677 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 11:12:07,677 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:07,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965451346] [2021-05-06 11:12:07,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [965451346] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:07,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:07,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:12:07,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132469154] [2021-05-06 11:12:07,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:12:07,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:07,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:12:07,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:12:07,678 INFO L87 Difference]: Start difference. First operand 1076 states and 1288 transitions. Second operand has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:09,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:09,751 INFO L93 Difference]: Finished difference Result 1388 states and 1673 transitions. [2021-05-06 11:12:09,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:12:09,751 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 68 [2021-05-06 11:12:09,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:09,753 INFO L225 Difference]: With dead ends: 1388 [2021-05-06 11:12:09,753 INFO L226 Difference]: Without dead ends: 1386 [2021-05-06 11:12:09,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 871.4ms TimeCoverageRelationStatistics Valid=294, Invalid=2358, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:12:09,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1386 states. [2021-05-06 11:12:10,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1386 to 1107. [2021-05-06 11:12:10,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 1050 states have (on average 1.1961904761904762) internal successors, (1256), 1073 states have internal predecessors, (1256), 38 states have call successors, (38), 19 states have call predecessors, (38), 18 states have return successors, (36), 14 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 11:12:10,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1330 transitions. [2021-05-06 11:12:10,314 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1330 transitions. Word has length 68 [2021-05-06 11:12:10,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:10,314 INFO L480 AbstractCegarLoop]: Abstraction has 1107 states and 1330 transitions. [2021-05-06 11:12:10,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:10,314 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1330 transitions. [2021-05-06 11:12:10,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:10,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:10,315 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:10,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:12:10,316 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:10,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:10,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1755632320, now seen corresponding path program 12 times [2021-05-06 11:12:10,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:10,316 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379035827] [2021-05-06 11:12:10,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:10,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:10,319 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:10,320 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:10,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:11,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:11,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:11,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:12:11,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:11,230 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 11:12:11,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:11,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379035827] [2021-05-06 11:12:11,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [379035827] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:11,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:11,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:12:11,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100044048] [2021-05-06 11:12:11,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:12:11,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:11,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:12:11,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:12:11,231 INFO L87 Difference]: Start difference. First operand 1107 states and 1330 transitions. Second operand has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:16,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:16,011 INFO L93 Difference]: Finished difference Result 1347 states and 1617 transitions. [2021-05-06 11:12:16,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:12:16,011 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 69 [2021-05-06 11:12:16,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:16,013 INFO L225 Difference]: With dead ends: 1347 [2021-05-06 11:12:16,013 INFO L226 Difference]: Without dead ends: 1345 [2021-05-06 11:12:16,013 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 10 SyntacticMatches, 5 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4227 ImplicationChecksByTransitivity, 3169.5ms TimeCoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:12:16,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1345 states. [2021-05-06 11:12:16,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1345 to 1130. [2021-05-06 11:12:16,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1130 states, 1074 states have (on average 1.1973929236499068) internal successors, (1286), 1097 states have internal predecessors, (1286), 37 states have call successors, (37), 19 states have call predecessors, (37), 18 states have return successors, (35), 13 states have call predecessors, (35), 35 states have call successors, (35) [2021-05-06 11:12:16,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1130 states to 1130 states and 1358 transitions. [2021-05-06 11:12:16,603 INFO L78 Accepts]: Start accepts. Automaton has 1130 states and 1358 transitions. Word has length 69 [2021-05-06 11:12:16,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:16,603 INFO L480 AbstractCegarLoop]: Abstraction has 1130 states and 1358 transitions. [2021-05-06 11:12:16,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:16,603 INFO L276 IsEmpty]: Start isEmpty. Operand 1130 states and 1358 transitions. [2021-05-06 11:12:16,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:16,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:16,605 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:16,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2021-05-06 11:12:16,605 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:16,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:16,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1758967990, now seen corresponding path program 13 times [2021-05-06 11:12:16,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:16,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879951818] [2021-05-06 11:12:16,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:16,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:16,609 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:16,609 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:16,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:17,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:17,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:17,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:12:17,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:17,550 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 11:12:17,550 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:17,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879951818] [2021-05-06 11:12:17,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1879951818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:17,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:17,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:12:17,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277058036] [2021-05-06 11:12:17,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:12:17,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:17,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:12:17,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1001, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:12:17,551 INFO L87 Difference]: Start difference. First operand 1130 states and 1358 transitions. Second operand has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:20,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:20,554 INFO L93 Difference]: Finished difference Result 1409 states and 1695 transitions. [2021-05-06 11:12:20,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:12:20,554 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 69 [2021-05-06 11:12:20,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:20,556 INFO L225 Difference]: With dead ends: 1409 [2021-05-06 11:12:20,556 INFO L226 Difference]: Without dead ends: 1407 [2021-05-06 11:12:20,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 7 SyntacticMatches, 6 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1604 ImplicationChecksByTransitivity, 1971.2ms TimeCoverageRelationStatistics Valid=517, Invalid=4885, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:12:20,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1407 states. [2021-05-06 11:12:21,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1407 to 1145. [2021-05-06 11:12:21,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1145 states, 1088 states have (on average 1.197610294117647) internal successors, (1303), 1112 states have internal predecessors, (1303), 38 states have call successors, (38), 19 states have call predecessors, (38), 18 states have return successors, (36), 13 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 11:12:21,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1145 states to 1145 states and 1377 transitions. [2021-05-06 11:12:21,137 INFO L78 Accepts]: Start accepts. Automaton has 1145 states and 1377 transitions. Word has length 69 [2021-05-06 11:12:21,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:21,137 INFO L480 AbstractCegarLoop]: Abstraction has 1145 states and 1377 transitions. [2021-05-06 11:12:21,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:21,137 INFO L276 IsEmpty]: Start isEmpty. Operand 1145 states and 1377 transitions. [2021-05-06 11:12:21,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:21,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:21,138 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:21,138 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:12:21,138 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:21,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:21,139 INFO L82 PathProgramCache]: Analyzing trace with hash -310743238, now seen corresponding path program 14 times [2021-05-06 11:12:21,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:21,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033829138] [2021-05-06 11:12:21,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:21,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:21,142 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:21,142 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:21,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:22,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:22,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:12:22,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:22,231 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 11:12:22,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:22,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033829138] [2021-05-06 11:12:22,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1033829138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:22,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:22,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:12:22,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884064001] [2021-05-06 11:12:22,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:12:22,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:22,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:12:22,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1225, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:12:22,232 INFO L87 Difference]: Start difference. First operand 1145 states and 1377 transitions. Second operand has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:26,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:26,514 INFO L93 Difference]: Finished difference Result 1276 states and 1533 transitions. [2021-05-06 11:12:26,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:12:26,514 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 69 [2021-05-06 11:12:26,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:26,516 INFO L225 Difference]: With dead ends: 1276 [2021-05-06 11:12:26,516 INFO L226 Difference]: Without dead ends: 1274 [2021-05-06 11:12:26,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2161 ImplicationChecksByTransitivity, 3394.2ms TimeCoverageRelationStatistics Valid=832, Invalid=7178, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:12:26,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2021-05-06 11:12:27,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 1133. [2021-05-06 11:12:27,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1133 states, 1077 states have (on average 1.1977715877437325) internal successors, (1290), 1100 states have internal predecessors, (1290), 37 states have call successors, (37), 19 states have call predecessors, (37), 18 states have return successors, (35), 13 states have call predecessors, (35), 35 states have call successors, (35) [2021-05-06 11:12:27,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1133 states to 1133 states and 1362 transitions. [2021-05-06 11:12:27,105 INFO L78 Accepts]: Start accepts. Automaton has 1133 states and 1362 transitions. Word has length 69 [2021-05-06 11:12:27,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:27,106 INFO L480 AbstractCegarLoop]: Abstraction has 1133 states and 1362 transitions. [2021-05-06 11:12:27,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:27,106 INFO L276 IsEmpty]: Start isEmpty. Operand 1133 states and 1362 transitions. [2021-05-06 11:12:27,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:27,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:27,107 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:27,107 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:12:27,107 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:27,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:27,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1944728152, now seen corresponding path program 15 times [2021-05-06 11:12:27,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:27,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314938299] [2021-05-06 11:12:27,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:27,111 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:27,111 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:27,112 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:27,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:28,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:28,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:28,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:12:28,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:28,121 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 11:12:28,121 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:28,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314938299] [2021-05-06 11:12:28,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1314938299] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:28,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:28,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:12:28,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960473555] [2021-05-06 11:12:28,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:12:28,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:28,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:12:28,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:12:28,122 INFO L87 Difference]: Start difference. First operand 1133 states and 1362 transitions. Second operand has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:30,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:30,449 INFO L93 Difference]: Finished difference Result 1209 states and 1448 transitions. [2021-05-06 11:12:30,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:12:30,449 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 69 [2021-05-06 11:12:30,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:30,450 INFO L225 Difference]: With dead ends: 1209 [2021-05-06 11:12:30,450 INFO L226 Difference]: Without dead ends: 1207 [2021-05-06 11:12:30,451 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1400 ImplicationChecksByTransitivity, 1723.8ms TimeCoverageRelationStatistics Valid=402, Invalid=4020, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:12:30,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1207 states. [2021-05-06 11:12:31,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1207 to 1108. [2021-05-06 11:12:31,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1108 states, 1055 states have (on average 1.2) internal successors, (1266), 1076 states have internal predecessors, (1266), 35 states have call successors, (35), 18 states have call predecessors, (35), 17 states have return successors, (33), 13 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-06 11:12:31,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1108 states to 1108 states and 1334 transitions. [2021-05-06 11:12:31,004 INFO L78 Accepts]: Start accepts. Automaton has 1108 states and 1334 transitions. Word has length 69 [2021-05-06 11:12:31,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:31,004 INFO L480 AbstractCegarLoop]: Abstraction has 1108 states and 1334 transitions. [2021-05-06 11:12:31,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 36 states have internal predecessors, (63), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:12:31,004 INFO L276 IsEmpty]: Start isEmpty. Operand 1108 states and 1334 transitions. [2021-05-06 11:12:31,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:12:31,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:31,005 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:31,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2021-05-06 11:12:31,005 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:31,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:31,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1004222264, now seen corresponding path program 20 times [2021-05-06 11:12:31,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:31,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246453046] [2021-05-06 11:12:31,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:31,009 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:31,009 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:31,009 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:31,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:31,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:12:31,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:12:31,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:31,268 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 11:12:31,268 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:31,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246453046] [2021-05-06 11:12:31,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1246453046] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:31,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:31,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:12:31,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447493162] [2021-05-06 11:12:31,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:12:31,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:31,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:12:31,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:12:31,269 INFO L87 Difference]: Start difference. First operand 1108 states and 1334 transitions. Second operand has 21 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:12:33,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:33,321 INFO L93 Difference]: Finished difference Result 1321 states and 1595 transitions. [2021-05-06 11:12:33,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:12:33,321 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 71 [2021-05-06 11:12:33,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:33,322 INFO L225 Difference]: With dead ends: 1321 [2021-05-06 11:12:33,322 INFO L226 Difference]: Without dead ends: 1319 [2021-05-06 11:12:33,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 607.2ms TimeCoverageRelationStatistics Valid=241, Invalid=2015, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:12:33,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1319 states. [2021-05-06 11:12:33,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1319 to 1150. [2021-05-06 11:12:33,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1150 states, 1091 states have (on average 1.1952337305224565) internal successors, (1304), 1116 states have internal predecessors, (1304), 41 states have call successors, (41), 18 states have call predecessors, (41), 17 states have return successors, (39), 15 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 11:12:33,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1150 states to 1150 states and 1384 transitions. [2021-05-06 11:12:33,958 INFO L78 Accepts]: Start accepts. Automaton has 1150 states and 1384 transitions. Word has length 71 [2021-05-06 11:12:33,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:33,959 INFO L480 AbstractCegarLoop]: Abstraction has 1150 states and 1384 transitions. [2021-05-06 11:12:33,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:12:33,959 INFO L276 IsEmpty]: Start isEmpty. Operand 1150 states and 1384 transitions. [2021-05-06 11:12:33,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:33,960 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:33,960 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:33,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:12:33,960 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:33,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:33,960 INFO L82 PathProgramCache]: Analyzing trace with hash 353640872, now seen corresponding path program 26 times [2021-05-06 11:12:33,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:33,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279651805] [2021-05-06 11:12:33,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:33,964 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:33,964 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:33,964 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:33,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:34,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:34,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:34,137 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 11:12:34,137 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:34,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279651805] [2021-05-06 11:12:34,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1279651805] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:34,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:34,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:12:34,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553526655] [2021-05-06 11:12:34,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:12:34,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:34,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:12:34,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:12:34,138 INFO L87 Difference]: Start difference. First operand 1150 states and 1384 transitions. Second operand has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 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 11:12:36,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:36,175 INFO L93 Difference]: Finished difference Result 2422 states and 2994 transitions. [2021-05-06 11:12:36,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:12:36,175 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 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 69 [2021-05-06 11:12:36,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:36,177 INFO L225 Difference]: With dead ends: 2422 [2021-05-06 11:12:36,178 INFO L226 Difference]: Without dead ends: 2118 [2021-05-06 11:12:36,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 446.7ms TimeCoverageRelationStatistics Valid=146, Invalid=784, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:12:36,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2118 states. [2021-05-06 11:12:37,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2118 to 1619. [2021-05-06 11:12:37,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1619 states, 1560 states have (on average 1.2128205128205127) internal successors, (1892), 1585 states have internal predecessors, (1892), 41 states have call successors, (41), 18 states have call predecessors, (41), 17 states have return successors, (39), 15 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 11:12:37,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1619 states to 1619 states and 1972 transitions. [2021-05-06 11:12:37,038 INFO L78 Accepts]: Start accepts. Automaton has 1619 states and 1972 transitions. Word has length 69 [2021-05-06 11:12:37,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:37,038 INFO L480 AbstractCegarLoop]: Abstraction has 1619 states and 1972 transitions. [2021-05-06 11:12:37,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 16 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 11:12:37,038 INFO L276 IsEmpty]: Start isEmpty. Operand 1619 states and 1972 transitions. [2021-05-06 11:12:37,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:37,040 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:37,040 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:37,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:12:37,040 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:37,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:37,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1795844299, now seen corresponding path program 27 times [2021-05-06 11:12:37,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:37,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249778832] [2021-05-06 11:12:37,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:37,044 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:37,044 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:37,044 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:37,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:37,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:37,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:37,311 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 11:12:37,312 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:37,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249778832] [2021-05-06 11:12:37,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [249778832] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:37,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:37,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:12:37,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765333906] [2021-05-06 11:12:37,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:12:37,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:37,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:12:37,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:12:37,312 INFO L87 Difference]: Start difference. First operand 1619 states and 1972 transitions. Second operand has 23 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 11:12:40,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:40,304 INFO L93 Difference]: Finished difference Result 2136 states and 2622 transitions. [2021-05-06 11:12:40,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:12:40,304 INFO L78 Accepts]: Start accepts. Automaton has has 23 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 69 [2021-05-06 11:12:40,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:40,307 INFO L225 Difference]: With dead ends: 2136 [2021-05-06 11:12:40,307 INFO L226 Difference]: Without dead ends: 2134 [2021-05-06 11:12:40,307 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2328 ImplicationChecksByTransitivity, 1150.3ms TimeCoverageRelationStatistics Valid=1637, Invalid=5335, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:12:40,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-05-06 11:12:41,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1723. [2021-05-06 11:12:41,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1723 states, 1662 states have (on average 1.2196149217809868) internal successors, (2027), 1688 states have internal predecessors, (2027), 42 states have call successors, (42), 19 states have call predecessors, (42), 18 states have return successors, (40), 15 states have call predecessors, (40), 40 states have call successors, (40) [2021-05-06 11:12:41,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1723 states to 1723 states and 2109 transitions. [2021-05-06 11:12:41,233 INFO L78 Accepts]: Start accepts. Automaton has 1723 states and 2109 transitions. Word has length 69 [2021-05-06 11:12:41,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:41,233 INFO L480 AbstractCegarLoop]: Abstraction has 1723 states and 2109 transitions. [2021-05-06 11:12:41,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 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 11:12:41,233 INFO L276 IsEmpty]: Start isEmpty. Operand 1723 states and 2109 transitions. [2021-05-06 11:12:41,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:41,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:41,235 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:41,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2021-05-06 11:12:41,235 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:41,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:41,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1094779721, now seen corresponding path program 22 times [2021-05-06 11:12:41,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:41,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887262205] [2021-05-06 11:12:41,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:41,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:41,239 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:41,240 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:41,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:41,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:41,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:41,323 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 11:12:41,323 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:41,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887262205] [2021-05-06 11:12:41,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [887262205] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:41,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:41,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:12:41,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525124768] [2021-05-06 11:12:41,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:12:41,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:41,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:12:41,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:12:41,324 INFO L87 Difference]: Start difference. First operand 1723 states and 2109 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 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 11:12:43,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:43,137 INFO L93 Difference]: Finished difference Result 2012 states and 2463 transitions. [2021-05-06 11:12:43,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:12:43,137 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 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 69 [2021-05-06 11:12:43,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:43,141 INFO L225 Difference]: With dead ends: 2012 [2021-05-06 11:12:43,141 INFO L226 Difference]: Without dead ends: 1979 [2021-05-06 11:12:43,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 279.0ms TimeCoverageRelationStatistics Valid=511, Invalid=1381, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:12:43,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1979 states. [2021-05-06 11:12:44,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1979 to 1730. [2021-05-06 11:12:44,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1730 states, 1669 states have (on average 1.21929298981426) internal successors, (2035), 1695 states have internal predecessors, (2035), 42 states have call successors, (42), 19 states have call predecessors, (42), 18 states have return successors, (40), 15 states have call predecessors, (40), 40 states have call successors, (40) [2021-05-06 11:12:44,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1730 states to 1730 states and 2117 transitions. [2021-05-06 11:12:44,082 INFO L78 Accepts]: Start accepts. Automaton has 1730 states and 2117 transitions. Word has length 69 [2021-05-06 11:12:44,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:44,083 INFO L480 AbstractCegarLoop]: Abstraction has 1730 states and 2117 transitions. [2021-05-06 11:12:44,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 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 11:12:44,083 INFO L276 IsEmpty]: Start isEmpty. Operand 1730 states and 2117 transitions. [2021-05-06 11:12:44,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:44,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:44,084 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:44,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2021-05-06 11:12:44,084 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:44,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:44,084 INFO L82 PathProgramCache]: Analyzing trace with hash 2103292271, now seen corresponding path program 28 times [2021-05-06 11:12:44,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:44,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495959754] [2021-05-06 11:12:44,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:44,088 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:44,088 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:44,089 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:44,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:44,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:44,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:44,600 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 11:12:44,600 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:44,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495959754] [2021-05-06 11:12:44,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [495959754] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:44,600 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:44,600 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:12:44,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616420948] [2021-05-06 11:12:44,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:12:44,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:44,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:12:44,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=503, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:12:44,601 INFO L87 Difference]: Start difference. First operand 1730 states and 2117 transitions. Second operand has 25 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 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 11:12:47,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:47,257 INFO L93 Difference]: Finished difference Result 1953 states and 2386 transitions. [2021-05-06 11:12:47,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:12:47,258 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 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 69 [2021-05-06 11:12:47,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:47,260 INFO L225 Difference]: With dead ends: 1953 [2021-05-06 11:12:47,260 INFO L226 Difference]: Without dead ends: 1951 [2021-05-06 11:12:47,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 928 ImplicationChecksByTransitivity, 1154.5ms TimeCoverageRelationStatistics Valid=584, Invalid=2956, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:12:47,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1951 states. [2021-05-06 11:12:48,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1951 to 1751. [2021-05-06 11:12:48,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1751 states, 1690 states have (on average 1.2207100591715976) internal successors, (2063), 1716 states have internal predecessors, (2063), 42 states have call successors, (42), 19 states have call predecessors, (42), 18 states have return successors, (40), 15 states have call predecessors, (40), 40 states have call successors, (40) [2021-05-06 11:12:48,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1751 states to 1751 states and 2145 transitions. [2021-05-06 11:12:48,185 INFO L78 Accepts]: Start accepts. Automaton has 1751 states and 2145 transitions. Word has length 69 [2021-05-06 11:12:48,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:48,186 INFO L480 AbstractCegarLoop]: Abstraction has 1751 states and 2145 transitions. [2021-05-06 11:12:48,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 23 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 11:12:48,188 INFO L276 IsEmpty]: Start isEmpty. Operand 1751 states and 2145 transitions. [2021-05-06 11:12:48,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:48,189 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:48,189 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:48,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:12:48,189 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:48,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:48,190 INFO L82 PathProgramCache]: Analyzing trace with hash -671758409, now seen corresponding path program 23 times [2021-05-06 11:12:48,190 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:48,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800511061] [2021-05-06 11:12:48,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:48,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:48,193 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:48,193 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:48,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:48,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:48,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:48,700 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 11:12:48,700 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:48,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800511061] [2021-05-06 11:12:48,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1800511061] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:48,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:48,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:12:48,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910084354] [2021-05-06 11:12:48,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:12:48,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:48,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:12:48,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:12:48,701 INFO L87 Difference]: Start difference. First operand 1751 states and 2145 transitions. Second operand has 27 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 11:12:53,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:53,829 INFO L93 Difference]: Finished difference Result 2150 states and 2617 transitions. [2021-05-06 11:12:53,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:12:53,830 INFO L78 Accepts]: Start accepts. Automaton has has 27 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 69 [2021-05-06 11:12:53,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:53,832 INFO L225 Difference]: With dead ends: 2150 [2021-05-06 11:12:53,832 INFO L226 Difference]: Without dead ends: 2148 [2021-05-06 11:12:53,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 3 SyntacticMatches, 7 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 2159.5ms TimeCoverageRelationStatistics Valid=765, Invalid=8165, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:12:53,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2148 states. [2021-05-06 11:12:54,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2148 to 1844. [2021-05-06 11:12:54,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1844 states, 1774 states have (on average 1.2198421645997746) internal successors, (2164), 1806 states have internal predecessors, (2164), 48 states have call successors, (48), 22 states have call predecessors, (48), 21 states have return successors, (46), 15 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-06 11:12:54,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1844 states to 1844 states and 2258 transitions. [2021-05-06 11:12:54,812 INFO L78 Accepts]: Start accepts. Automaton has 1844 states and 2258 transitions. Word has length 69 [2021-05-06 11:12:54,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:54,812 INFO L480 AbstractCegarLoop]: Abstraction has 1844 states and 2258 transitions. [2021-05-06 11:12:54,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 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 11:12:54,812 INFO L276 IsEmpty]: Start isEmpty. Operand 1844 states and 2258 transitions. [2021-05-06 11:12:54,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:54,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:54,823 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:54,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 11:12:54,823 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:54,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:54,823 INFO L82 PathProgramCache]: Analyzing trace with hash 194554805, now seen corresponding path program 29 times [2021-05-06 11:12:54,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:54,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7590884] [2021-05-06 11:12:54,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:54,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:54,827 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:54,827 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:54,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:55,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:55,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:55,567 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 11:12:55,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:55,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7590884] [2021-05-06 11:12:55,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [7590884] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:55,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:55,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:12:55,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068029356] [2021-05-06 11:12:55,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:12:55,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:55,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:12:55,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:12:55,568 INFO L87 Difference]: Start difference. First operand 1844 states and 2258 transitions. Second operand has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 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 11:12:58,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:58,789 INFO L93 Difference]: Finished difference Result 2130 states and 2592 transitions. [2021-05-06 11:12:58,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:12:58,789 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 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 69 [2021-05-06 11:12:58,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:58,792 INFO L225 Difference]: With dead ends: 2130 [2021-05-06 11:12:58,792 INFO L226 Difference]: Without dead ends: 2128 [2021-05-06 11:12:58,792 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1361.2ms TimeCoverageRelationStatistics Valid=409, Invalid=3251, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:12:58,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2128 states. [2021-05-06 11:12:59,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2128 to 1872. [2021-05-06 11:12:59,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1872 states, 1801 states have (on average 1.220988339811216) internal successors, (2199), 1833 states have internal predecessors, (2199), 48 states have call successors, (48), 23 states have call predecessors, (48), 22 states have return successors, (46), 15 states have call predecessors, (46), 46 states have call successors, (46) [2021-05-06 11:12:59,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1872 states to 1872 states and 2293 transitions. [2021-05-06 11:12:59,787 INFO L78 Accepts]: Start accepts. Automaton has 1872 states and 2293 transitions. Word has length 69 [2021-05-06 11:12:59,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:59,787 INFO L480 AbstractCegarLoop]: Abstraction has 1872 states and 2293 transitions. [2021-05-06 11:12:59,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 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 11:12:59,787 INFO L276 IsEmpty]: Start isEmpty. Operand 1872 states and 2293 transitions. [2021-05-06 11:12:59,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:12:59,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:59,789 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:59,789 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2021-05-06 11:12:59,789 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:59,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:59,789 INFO L82 PathProgramCache]: Analyzing trace with hash 2116173301, now seen corresponding path program 30 times [2021-05-06 11:12:59,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:59,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883205076] [2021-05-06 11:12:59,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:59,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:59,795 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:59,795 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:12:59,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:00,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:00,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:00,589 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 11:13:00,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:00,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883205076] [2021-05-06 11:13:00,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [883205076] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:00,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:00,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:13:00,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770860923] [2021-05-06 11:13:00,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:13:00,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:00,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:13:00,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:13:00,590 INFO L87 Difference]: Start difference. First operand 1872 states and 2293 transitions. Second operand has 29 states, 28 states have (on average 2.3214285714285716) internal successors, (65), 27 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 11:13:03,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:03,694 INFO L93 Difference]: Finished difference Result 2159 states and 2630 transitions. [2021-05-06 11:13:03,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:13:03,694 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.3214285714285716) internal successors, (65), 27 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 69 [2021-05-06 11:13:03,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:03,696 INFO L225 Difference]: With dead ends: 2159 [2021-05-06 11:13:03,696 INFO L226 Difference]: Without dead ends: 2157 [2021-05-06 11:13:03,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 1453.0ms TimeCoverageRelationStatistics Valid=434, Invalid=2988, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:13:03,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2157 states. [2021-05-06 11:13:04,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2157 to 1903. [2021-05-06 11:13:04,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1903 states, 1830 states have (on average 1.221311475409836) internal successors, (2235), 1863 states have internal predecessors, (2235), 49 states have call successors, (49), 24 states have call predecessors, (49), 23 states have return successors, (47), 15 states have call predecessors, (47), 47 states have call successors, (47) [2021-05-06 11:13:04,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1903 states to 1903 states and 2331 transitions. [2021-05-06 11:13:04,718 INFO L78 Accepts]: Start accepts. Automaton has 1903 states and 2331 transitions. Word has length 69 [2021-05-06 11:13:04,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:04,718 INFO L480 AbstractCegarLoop]: Abstraction has 1903 states and 2331 transitions. [2021-05-06 11:13:04,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.3214285714285716) internal successors, (65), 27 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 11:13:04,718 INFO L276 IsEmpty]: Start isEmpty. Operand 1903 states and 2331 transitions. [2021-05-06 11:13:04,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:13:04,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:04,720 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:04,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:13:04,720 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:04,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:04,720 INFO L82 PathProgramCache]: Analyzing trace with hash -643408281, now seen corresponding path program 24 times [2021-05-06 11:13:04,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:04,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578664451] [2021-05-06 11:13:04,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:04,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:04,724 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:04,724 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:04,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:05,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:05,503 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 11:13:05,503 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:05,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578664451] [2021-05-06 11:13:05,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1578664451] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:05,503 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:05,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:13:05,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006471322] [2021-05-06 11:13:05,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:13:05,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:05,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:13:05,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1054, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:13:05,504 INFO L87 Difference]: Start difference. First operand 1903 states and 2331 transitions. Second operand has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:13:12,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:12,117 INFO L93 Difference]: Finished difference Result 2407 states and 2926 transitions. [2021-05-06 11:13:12,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:13:12,117 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 69 [2021-05-06 11:13:12,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:12,120 INFO L225 Difference]: With dead ends: 2407 [2021-05-06 11:13:12,120 INFO L226 Difference]: Without dead ends: 2405 [2021-05-06 11:13:12,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2736 ImplicationChecksByTransitivity, 3480.7ms TimeCoverageRelationStatistics Valid=1161, Invalid=8739, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:13:12,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2405 states. [2021-05-06 11:13:13,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2405 to 1968. [2021-05-06 11:13:13,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1968 states, 1890 states have (on average 1.2195767195767195) internal successors, (2305), 1926 states have internal predecessors, (2305), 52 states have call successors, (52), 26 states have call predecessors, (52), 25 states have return successors, (50), 15 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-06 11:13:13,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1968 states to 1968 states and 2407 transitions. [2021-05-06 11:13:13,233 INFO L78 Accepts]: Start accepts. Automaton has 1968 states and 2407 transitions. Word has length 69 [2021-05-06 11:13:13,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:13,233 INFO L480 AbstractCegarLoop]: Abstraction has 1968 states and 2407 transitions. [2021-05-06 11:13:13,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:13:13,233 INFO L276 IsEmpty]: Start isEmpty. Operand 1968 states and 2407 transitions. [2021-05-06 11:13:13,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:13:13,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:13,235 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:13,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102 [2021-05-06 11:13:13,235 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:13,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:13,235 INFO L82 PathProgramCache]: Analyzing trace with hash -141333981, now seen corresponding path program 31 times [2021-05-06 11:13:13,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:13,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256199474] [2021-05-06 11:13:13,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:13,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:13,240 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:13,240 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:13,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:13,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:13,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:13,988 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 11:13:13,988 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:13,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256199474] [2021-05-06 11:13:13,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [256199474] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:13,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:13,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:13:13,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253030627] [2021-05-06 11:13:13,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:13:13,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:13,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:13:13,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=762, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:13:13,989 INFO L87 Difference]: Start difference. First operand 1968 states and 2407 transitions. Second operand has 30 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 28 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 11:13:17,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:17,618 INFO L93 Difference]: Finished difference Result 2384 states and 2900 transitions. [2021-05-06 11:13:17,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:13:17,619 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 28 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 69 [2021-05-06 11:13:17,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:17,621 INFO L225 Difference]: With dead ends: 2384 [2021-05-06 11:13:17,621 INFO L226 Difference]: Without dead ends: 2382 [2021-05-06 11:13:17,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 998 ImplicationChecksByTransitivity, 1314.3ms TimeCoverageRelationStatistics Valid=345, Invalid=3315, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:13:17,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2382 states. [2021-05-06 11:13:18,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2382 to 1972. [2021-05-06 11:13:18,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1972 states, 1892 states have (on average 1.2188160676532769) internal successors, (2306), 1929 states have internal predecessors, (2306), 53 states have call successors, (53), 27 states have call predecessors, (53), 26 states have return successors, (51), 15 states have call predecessors, (51), 51 states have call successors, (51) [2021-05-06 11:13:18,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1972 states to 1972 states and 2410 transitions. [2021-05-06 11:13:18,779 INFO L78 Accepts]: Start accepts. Automaton has 1972 states and 2410 transitions. Word has length 69 [2021-05-06 11:13:18,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:18,779 INFO L480 AbstractCegarLoop]: Abstraction has 1972 states and 2410 transitions. [2021-05-06 11:13:18,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 2.2413793103448274) internal successors, (65), 28 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 11:13:18,780 INFO L276 IsEmpty]: Start isEmpty. Operand 1972 states and 2410 transitions. [2021-05-06 11:13:18,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:13:18,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:18,781 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:18,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2021-05-06 11:13:18,781 INFO L428 AbstractCegarLoop]: === Iteration 105 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:18,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:18,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1309954697, now seen corresponding path program 25 times [2021-05-06 11:13:18,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:18,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710711905] [2021-05-06 11:13:18,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:18,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:18,787 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:18,788 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:18,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:19,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:19,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:19,795 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 11:13:19,795 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:19,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710711905] [2021-05-06 11:13:19,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1710711905] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:19,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:19,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:13:19,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347590715] [2021-05-06 11:13:19,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:13:19,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:19,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:13:19,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:13:19,796 INFO L87 Difference]: Start difference. First operand 1972 states and 2410 transitions. Second operand has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:13:23,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:23,809 INFO L93 Difference]: Finished difference Result 2360 states and 2868 transitions. [2021-05-06 11:13:23,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:13:23,810 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 69 [2021-05-06 11:13:23,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:23,812 INFO L225 Difference]: With dead ends: 2360 [2021-05-06 11:13:23,812 INFO L226 Difference]: Without dead ends: 2358 [2021-05-06 11:13:23,813 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1525 ImplicationChecksByTransitivity, 1976.9ms TimeCoverageRelationStatistics Valid=487, Invalid=5213, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:13:23,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2358 states. [2021-05-06 11:13:24,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2358 to 2023. [2021-05-06 11:13:24,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2023 states, 1943 states have (on average 1.2213072568193515) internal successors, (2373), 1980 states have internal predecessors, (2373), 53 states have call successors, (53), 27 states have call predecessors, (53), 26 states have return successors, (51), 15 states have call predecessors, (51), 51 states have call successors, (51) [2021-05-06 11:13:24,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2023 states to 2023 states and 2477 transitions. [2021-05-06 11:13:24,981 INFO L78 Accepts]: Start accepts. Automaton has 2023 states and 2477 transitions. Word has length 69 [2021-05-06 11:13:24,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:24,981 INFO L480 AbstractCegarLoop]: Abstraction has 2023 states and 2477 transitions. [2021-05-06 11:13:24,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:13:24,982 INFO L276 IsEmpty]: Start isEmpty. Operand 2023 states and 2477 transitions. [2021-05-06 11:13:24,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:13:24,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:24,983 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:24,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:13:24,983 INFO L428 AbstractCegarLoop]: === Iteration 106 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:24,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:24,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1869063899, now seen corresponding path program 26 times [2021-05-06 11:13:24,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:24,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583959143] [2021-05-06 11:13:24,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:24,988 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:24,988 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:24,989 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:25,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:25,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:25,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:25,606 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 11:13:25,606 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:25,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583959143] [2021-05-06 11:13:25,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [583959143] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:25,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:25,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:13:25,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824515853] [2021-05-06 11:13:25,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:13:25,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:25,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:13:25,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:13:25,607 INFO L87 Difference]: Start difference. First operand 2023 states and 2477 transitions. Second operand has 29 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 11:13:29,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:29,069 INFO L93 Difference]: Finished difference Result 2337 states and 2853 transitions. [2021-05-06 11:13:29,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:13:29,070 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 69 [2021-05-06 11:13:29,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:29,072 INFO L225 Difference]: With dead ends: 2337 [2021-05-06 11:13:29,072 INFO L226 Difference]: Without dead ends: 2335 [2021-05-06 11:13:29,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 1201.8ms TimeCoverageRelationStatistics Valid=320, Invalid=2986, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:13:29,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2335 states. [2021-05-06 11:13:30,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2335 to 1935. [2021-05-06 11:13:30,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1935 states, 1866 states have (on average 1.2245444801714898) internal successors, (2285), 1897 states have internal predecessors, (2285), 45 states have call successors, (45), 24 states have call predecessors, (45), 23 states have return successors, (43), 13 states have call predecessors, (43), 43 states have call successors, (43) [2021-05-06 11:13:30,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1935 states to 1935 states and 2373 transitions. [2021-05-06 11:13:30,178 INFO L78 Accepts]: Start accepts. Automaton has 1935 states and 2373 transitions. Word has length 69 [2021-05-06 11:13:30,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:30,178 INFO L480 AbstractCegarLoop]: Abstraction has 1935 states and 2373 transitions. [2021-05-06 11:13:30,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 11:13:30,179 INFO L276 IsEmpty]: Start isEmpty. Operand 1935 states and 2373 transitions. [2021-05-06 11:13:30,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:13:30,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:30,180 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 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] [2021-05-06 11:13:30,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105 [2021-05-06 11:13:30,180 INFO L428 AbstractCegarLoop]: === Iteration 107 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:30,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:30,181 INFO L82 PathProgramCache]: Analyzing trace with hash -306682746, now seen corresponding path program 16 times [2021-05-06 11:13:30,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:30,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117048333] [2021-05-06 11:13:30,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:30,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:30,185 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:30,186 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:30,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:31,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 11:13:31,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:13:31,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:31,136 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 11:13:31,136 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:31,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117048333] [2021-05-06 11:13:31,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [117048333] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:31,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:31,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:13:31,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175230174] [2021-05-06 11:13:31,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:13:31,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:31,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:13:31,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1123, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:13:31,137 INFO L87 Difference]: Start difference. First operand 1935 states and 2373 transitions. Second operand has 36 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:13:34,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:34,813 INFO L93 Difference]: Finished difference Result 2120 states and 2594 transitions. [2021-05-06 11:13:34,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:13:34,814 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 72 [2021-05-06 11:13:34,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:34,816 INFO L225 Difference]: With dead ends: 2120 [2021-05-06 11:13:34,816 INFO L226 Difference]: Without dead ends: 2077 [2021-05-06 11:13:34,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1639 ImplicationChecksByTransitivity, 2242.8ms TimeCoverageRelationStatistics Valid=525, Invalid=5175, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:13:34,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2077 states. [2021-05-06 11:13:35,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2077 to 2032. [2021-05-06 11:13:35,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2032 states, 1959 states have (on average 1.2256253190403268) internal successors, (2401), 1993 states have internal predecessors, (2401), 49 states have call successors, (49), 24 states have call predecessors, (49), 23 states have return successors, (47), 14 states have call predecessors, (47), 47 states have call successors, (47) [2021-05-06 11:13:35,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2032 states to 2032 states and 2497 transitions. [2021-05-06 11:13:35,981 INFO L78 Accepts]: Start accepts. Automaton has 2032 states and 2497 transitions. Word has length 72 [2021-05-06 11:13:35,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:35,981 INFO L480 AbstractCegarLoop]: Abstraction has 2032 states and 2497 transitions. [2021-05-06 11:13:35,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:13:35,981 INFO L276 IsEmpty]: Start isEmpty. Operand 2032 states and 2497 transitions. [2021-05-06 11:13:35,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:13:35,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:35,983 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 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] [2021-05-06 11:13:35,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2021-05-06 11:13:35,983 INFO L428 AbstractCegarLoop]: === Iteration 108 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:35,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:35,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1475670698, now seen corresponding path program 17 times [2021-05-06 11:13:35,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:35,983 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954349064] [2021-05-06 11:13:35,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:35,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:35,989 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:35,990 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:36,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:36,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:36,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:36,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-06 11:13:36,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:36,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:13:36,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:36,766 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 11:13:36,766 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:36,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954349064] [2021-05-06 11:13:36,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [954349064] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:36,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:36,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:13:36,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850868857] [2021-05-06 11:13:36,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:13:36,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:36,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:13:36,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:13:36,767 INFO L87 Difference]: Start difference. First operand 2032 states and 2497 transitions. Second operand has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:13:40,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:40,512 INFO L93 Difference]: Finished difference Result 2074 states and 2541 transitions. [2021-05-06 11:13:40,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:13:40,513 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 72 [2021-05-06 11:13:40,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:40,515 INFO L225 Difference]: With dead ends: 2074 [2021-05-06 11:13:40,515 INFO L226 Difference]: Without dead ends: 1997 [2021-05-06 11:13:40,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1729 ImplicationChecksByTransitivity, 2105.0ms TimeCoverageRelationStatistics Valid=513, Invalid=5187, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:13:40,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1997 states. [2021-05-06 11:13:41,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1997 to 1815. [2021-05-06 11:13:41,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1815 states, 1756 states have (on average 1.2317767653758542) internal successors, (2163), 1784 states have internal predecessors, (2163), 39 states have call successors, (39), 20 states have call predecessors, (39), 19 states have return successors, (38), 10 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-06 11:13:41,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1815 states to 1815 states and 2240 transitions. [2021-05-06 11:13:41,556 INFO L78 Accepts]: Start accepts. Automaton has 1815 states and 2240 transitions. Word has length 72 [2021-05-06 11:13:41,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:41,556 INFO L480 AbstractCegarLoop]: Abstraction has 1815 states and 2240 transitions. [2021-05-06 11:13:41,556 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:13:41,556 INFO L276 IsEmpty]: Start isEmpty. Operand 1815 states and 2240 transitions. [2021-05-06 11:13:41,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:13:41,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:41,558 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:41,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:13:41,558 INFO L428 AbstractCegarLoop]: === Iteration 109 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:41,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:41,558 INFO L82 PathProgramCache]: Analyzing trace with hash -501669198, now seen corresponding path program 7 times [2021-05-06 11:13:41,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:41,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299912160] [2021-05-06 11:13:41,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:41,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:41,562 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:41,562 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:41,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:41,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:41,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:41,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:13:41,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:41,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:13:41,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:41,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-06 11:13:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:41,894 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 11:13:41,895 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:41,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299912160] [2021-05-06 11:13:41,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1299912160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:41,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:41,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:13:41,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13320431] [2021-05-06 11:13:41,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:13:41,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:41,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:13:41,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:13:41,895 INFO L87 Difference]: Start difference. First operand 1815 states and 2240 transitions. Second operand has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:13:43,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:43,831 INFO L93 Difference]: Finished difference Result 1936 states and 2378 transitions. [2021-05-06 11:13:43,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:13:43,832 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 73 [2021-05-06 11:13:43,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:43,834 INFO L225 Difference]: With dead ends: 1936 [2021-05-06 11:13:43,834 INFO L226 Difference]: Without dead ends: 1934 [2021-05-06 11:13:43,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 517.4ms TimeCoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:13:43,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1934 states. [2021-05-06 11:13:45,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1934 to 1905. [2021-05-06 11:13:45,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1905 states, 1828 states have (on average 1.2226477024070022) internal successors, (2235), 1865 states have internal predecessors, (2235), 56 states have call successors, (56), 21 states have call predecessors, (56), 20 states have return successors, (55), 18 states have call predecessors, (55), 55 states have call successors, (55) [2021-05-06 11:13:45,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1905 states to 1905 states and 2346 transitions. [2021-05-06 11:13:45,070 INFO L78 Accepts]: Start accepts. Automaton has 1905 states and 2346 transitions. Word has length 73 [2021-05-06 11:13:45,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:45,070 INFO L480 AbstractCegarLoop]: Abstraction has 1905 states and 2346 transitions. [2021-05-06 11:13:45,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 2.85) internal successors, (57), 19 states have internal predecessors, (57), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:13:45,071 INFO L276 IsEmpty]: Start isEmpty. Operand 1905 states and 2346 transitions. [2021-05-06 11:13:45,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:13:45,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:45,072 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:45,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108 [2021-05-06 11:13:45,072 INFO L428 AbstractCegarLoop]: === Iteration 110 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:45,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:45,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1791898001, now seen corresponding path program 21 times [2021-05-06 11:13:45,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:45,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698094018] [2021-05-06 11:13:45,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:45,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:45,077 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:45,078 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:45,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:45,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:45,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:45,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:13:45,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:45,618 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 11:13:45,618 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:45,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698094018] [2021-05-06 11:13:45,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [698094018] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:45,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:45,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:13:45,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831698791] [2021-05-06 11:13:45,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:13:45,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:45,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:13:45,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:13:45,619 INFO L87 Difference]: Start difference. First operand 1905 states and 2346 transitions. Second operand has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:13:49,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:49,026 INFO L93 Difference]: Finished difference Result 2205 states and 2701 transitions. [2021-05-06 11:13:49,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:13:49,026 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 71 [2021-05-06 11:13:49,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:49,029 INFO L225 Difference]: With dead ends: 2205 [2021-05-06 11:13:49,029 INFO L226 Difference]: Without dead ends: 2203 [2021-05-06 11:13:49,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 932 ImplicationChecksByTransitivity, 1202.5ms TimeCoverageRelationStatistics Valid=462, Invalid=3320, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:13:49,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2203 states. [2021-05-06 11:13:50,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2203 to 1916. [2021-05-06 11:13:50,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1916 states, 1834 states have (on average 1.2208287895310797) internal successors, (2239), 1873 states have internal predecessors, (2239), 60 states have call successors, (60), 22 states have call predecessors, (60), 21 states have return successors, (59), 20 states have call predecessors, (59), 59 states have call successors, (59) [2021-05-06 11:13:50,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1916 states to 1916 states and 2358 transitions. [2021-05-06 11:13:50,382 INFO L78 Accepts]: Start accepts. Automaton has 1916 states and 2358 transitions. Word has length 71 [2021-05-06 11:13:50,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:50,382 INFO L480 AbstractCegarLoop]: Abstraction has 1916 states and 2358 transitions. [2021-05-06 11:13:50,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:13:50,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1916 states and 2358 transitions. [2021-05-06 11:13:50,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:13:50,384 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:50,384 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:50,384 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 11:13:50,384 INFO L428 AbstractCegarLoop]: === Iteration 111 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:50,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:50,385 INFO L82 PathProgramCache]: Analyzing trace with hash -2027609937, now seen corresponding path program 22 times [2021-05-06 11:13:50,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:50,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142212217] [2021-05-06 11:13:50,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:50,388 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:50,388 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:50,388 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:50,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:50,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:50,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:50,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:13:50,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:50,839 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 11:13:50,839 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:50,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142212217] [2021-05-06 11:13:50,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [142212217] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:50,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:50,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:13:50,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484783798] [2021-05-06 11:13:50,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:13:50,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:50,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:13:50,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:13:50,840 INFO L87 Difference]: Start difference. First operand 1916 states and 2358 transitions. Second operand has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:13:55,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:13:55,775 INFO L93 Difference]: Finished difference Result 2533 states and 3121 transitions. [2021-05-06 11:13:55,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:13:55,776 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 71 [2021-05-06 11:13:55,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:13:55,778 INFO L225 Difference]: With dead ends: 2533 [2021-05-06 11:13:55,778 INFO L226 Difference]: Without dead ends: 2531 [2021-05-06 11:13:55,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1750 ImplicationChecksByTransitivity, 1826.9ms TimeCoverageRelationStatistics Valid=701, Invalid=5461, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:13:55,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2531 states. [2021-05-06 11:13:57,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2531 to 2054. [2021-05-06 11:13:57,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2054 states, 1959 states have (on average 1.218989280245023) internal successors, (2388), 2003 states have internal predecessors, (2388), 71 states have call successors, (71), 24 states have call predecessors, (71), 23 states have return successors, (70), 26 states have call predecessors, (70), 70 states have call successors, (70) [2021-05-06 11:13:57,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2054 states to 2054 states and 2529 transitions. [2021-05-06 11:13:57,306 INFO L78 Accepts]: Start accepts. Automaton has 2054 states and 2529 transitions. Word has length 71 [2021-05-06 11:13:57,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:13:57,306 INFO L480 AbstractCegarLoop]: Abstraction has 2054 states and 2529 transitions. [2021-05-06 11:13:57,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:13:57,306 INFO L276 IsEmpty]: Start isEmpty. Operand 2054 states and 2529 transitions. [2021-05-06 11:13:57,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:13:57,308 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:13:57,308 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:13:57,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:13:57,308 INFO L428 AbstractCegarLoop]: === Iteration 112 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:13:57,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:13:57,309 INFO L82 PathProgramCache]: Analyzing trace with hash 952313571, now seen corresponding path program 23 times [2021-05-06 11:13:57,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:13:57,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814979786] [2021-05-06 11:13:57,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:13:57,312 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:13:57,312 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:13:57,312 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:13:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:57,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:13:57,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:57,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:13:57,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:13:57,729 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 11:13:57,730 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:13:57,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814979786] [2021-05-06 11:13:57,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [814979786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:13:57,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:13:57,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:13:57,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329979125] [2021-05-06 11:13:57,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:13:57,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:13:57,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:13:57,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=591, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:13:57,730 INFO L87 Difference]: Start difference. First operand 2054 states and 2529 transitions. Second operand has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:02,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:02,428 INFO L93 Difference]: Finished difference Result 2385 states and 2929 transitions. [2021-05-06 11:14:02,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:14:02,429 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 71 [2021-05-06 11:14:02,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:02,431 INFO L225 Difference]: With dead ends: 2385 [2021-05-06 11:14:02,431 INFO L226 Difference]: Without dead ends: 2383 [2021-05-06 11:14:02,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 6 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 1821.5ms TimeCoverageRelationStatistics Valid=597, Invalid=4515, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:14:02,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2383 states. [2021-05-06 11:14:03,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2383 to 2076. [2021-05-06 11:14:03,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2076 states, 1980 states have (on average 1.2196969696969697) internal successors, (2415), 2024 states have internal predecessors, (2415), 71 states have call successors, (71), 25 states have call predecessors, (71), 24 states have return successors, (70), 26 states have call predecessors, (70), 70 states have call successors, (70) [2021-05-06 11:14:03,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2076 states to 2076 states and 2556 transitions. [2021-05-06 11:14:03,962 INFO L78 Accepts]: Start accepts. Automaton has 2076 states and 2556 transitions. Word has length 71 [2021-05-06 11:14:03,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:03,962 INFO L480 AbstractCegarLoop]: Abstraction has 2076 states and 2556 transitions. [2021-05-06 11:14:03,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:03,962 INFO L276 IsEmpty]: Start isEmpty. Operand 2076 states and 2556 transitions. [2021-05-06 11:14:03,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:14:03,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:03,964 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:03,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2021-05-06 11:14:03,964 INFO L428 AbstractCegarLoop]: === Iteration 113 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:03,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:03,964 INFO L82 PathProgramCache]: Analyzing trace with hash -945381923, now seen corresponding path program 24 times [2021-05-06 11:14:03,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:03,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210787323] [2021-05-06 11:14:03,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:03,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:03,981 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:03,982 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:04,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:04,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:04,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:04,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:14:04,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:04,727 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 11:14:04,727 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:04,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210787323] [2021-05-06 11:14:04,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [210787323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:04,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:04,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:14:04,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825085098] [2021-05-06 11:14:04,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:14:04,728 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:04,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:14:04,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1014, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:14:04,728 INFO L87 Difference]: Start difference. First operand 2076 states and 2556 transitions. Second operand has 34 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:09,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:09,874 INFO L93 Difference]: Finished difference Result 2341 states and 2867 transitions. [2021-05-06 11:14:09,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:14:09,874 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 71 [2021-05-06 11:14:09,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:09,877 INFO L225 Difference]: With dead ends: 2341 [2021-05-06 11:14:09,877 INFO L226 Difference]: Without dead ends: 2339 [2021-05-06 11:14:09,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1863 ImplicationChecksByTransitivity, 2291.8ms TimeCoverageRelationStatistics Valid=732, Invalid=6074, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:14:09,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2339 states. [2021-05-06 11:14:11,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2339 to 2088. [2021-05-06 11:14:11,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2088 states, 1990 states have (on average 1.2180904522613065) internal successors, (2424), 2036 states have internal predecessors, (2424), 73 states have call successors, (73), 25 states have call predecessors, (73), 24 states have return successors, (72), 26 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-06 11:14:11,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 2569 transitions. [2021-05-06 11:14:11,462 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 2569 transitions. Word has length 71 [2021-05-06 11:14:11,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:11,463 INFO L480 AbstractCegarLoop]: Abstraction has 2088 states and 2569 transitions. [2021-05-06 11:14:11,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 32 states have (on average 2.03125) internal successors, (65), 32 states have internal predecessors, (65), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:11,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 2569 transitions. [2021-05-06 11:14:11,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:14:11,464 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:11,465 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:11,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2021-05-06 11:14:11,465 INFO L428 AbstractCegarLoop]: === Iteration 114 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:11,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:11,465 INFO L82 PathProgramCache]: Analyzing trace with hash 2062115907, now seen corresponding path program 18 times [2021-05-06 11:14:11,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:11,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925642776] [2021-05-06 11:14:11,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:11,468 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:11,468 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:11,469 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:11,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:12,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:12,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:12,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:14:12,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:12,296 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 11:14:12,296 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:12,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925642776] [2021-05-06 11:14:12,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1925642776] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:12,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:12,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:14:12,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585410165] [2021-05-06 11:14:12,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:14:12,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:12,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:14:12,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1051, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:14:12,297 INFO L87 Difference]: Start difference. First operand 2088 states and 2569 transitions. Second operand has 35 states, 33 states have (on average 2.0) internal successors, (66), 33 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:16,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:16,907 INFO L93 Difference]: Finished difference Result 2346 states and 2876 transitions. [2021-05-06 11:14:16,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:14:16,907 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.0) internal successors, (66), 33 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-06 11:14:16,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:16,909 INFO L225 Difference]: With dead ends: 2346 [2021-05-06 11:14:16,909 INFO L226 Difference]: Without dead ends: 2344 [2021-05-06 11:14:16,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 11 SyntacticMatches, 4 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 1859.7ms TimeCoverageRelationStatistics Valid=673, Invalid=5969, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:14:16,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2344 states. [2021-05-06 11:14:18,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2344 to 2107. [2021-05-06 11:14:18,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2107 states, 2008 states have (on average 1.217629482071713) internal successors, (2445), 2054 states have internal predecessors, (2445), 73 states have call successors, (73), 26 states have call predecessors, (73), 25 states have return successors, (72), 26 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-06 11:14:18,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 2590 transitions. [2021-05-06 11:14:18,541 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 2590 transitions. Word has length 72 [2021-05-06 11:14:18,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:18,541 INFO L480 AbstractCegarLoop]: Abstraction has 2107 states and 2590 transitions. [2021-05-06 11:14:18,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 33 states have (on average 2.0) internal successors, (66), 33 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:18,541 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 2590 transitions. [2021-05-06 11:14:18,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:14:18,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:18,543 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:18,543 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:14:18,543 INFO L428 AbstractCegarLoop]: === Iteration 115 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:18,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:18,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1824795895, now seen corresponding path program 19 times [2021-05-06 11:14:18,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:18,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170923164] [2021-05-06 11:14:18,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:18,546 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:18,546 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:18,547 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:18,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:19,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:19,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:19,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:14:19,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:19,592 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 11:14:19,592 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:19,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170923164] [2021-05-06 11:14:19,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [170923164] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:19,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:19,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:14:19,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656146245] [2021-05-06 11:14:19,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:14:19,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:19,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:14:19,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1132, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:14:19,593 INFO L87 Difference]: Start difference. First operand 2107 states and 2590 transitions. Second operand has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:28,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:28,137 INFO L93 Difference]: Finished difference Result 2587 states and 3174 transitions. [2021-05-06 11:14:28,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-05-06 11:14:28,138 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-06 11:14:28,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:28,141 INFO L225 Difference]: With dead ends: 2587 [2021-05-06 11:14:28,141 INFO L226 Difference]: Without dead ends: 2585 [2021-05-06 11:14:28,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 8 SyntacticMatches, 7 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6126 ImplicationChecksByTransitivity, 4607.4ms TimeCoverageRelationStatistics Valid=1872, Invalid=17034, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 11:14:28,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2585 states. [2021-05-06 11:14:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2585 to 2110. [2021-05-06 11:14:29,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2110 states, 2014 states have (on average 1.2194637537239326) internal successors, (2456), 2057 states have internal predecessors, (2456), 70 states have call successors, (70), 26 states have call predecessors, (70), 25 states have return successors, (69), 26 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-06 11:14:29,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2110 states to 2110 states and 2595 transitions. [2021-05-06 11:14:29,733 INFO L78 Accepts]: Start accepts. Automaton has 2110 states and 2595 transitions. Word has length 72 [2021-05-06 11:14:29,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:29,733 INFO L480 AbstractCegarLoop]: Abstraction has 2110 states and 2595 transitions. [2021-05-06 11:14:29,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:29,733 INFO L276 IsEmpty]: Start isEmpty. Operand 2110 states and 2595 transitions. [2021-05-06 11:14:29,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:14:29,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:29,735 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:29,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2021-05-06 11:14:29,735 INFO L428 AbstractCegarLoop]: === Iteration 116 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:29,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:29,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1689804415, now seen corresponding path program 20 times [2021-05-06 11:14:29,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:29,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562802963] [2021-05-06 11:14:29,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:29,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:29,753 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:29,754 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:29,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:30,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:30,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:30,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:14:30,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:30,573 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 11:14:30,573 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:30,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562802963] [2021-05-06 11:14:30,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1562802963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:30,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:30,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:14:30,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315148759] [2021-05-06 11:14:30,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:14:30,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:30,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:14:30,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:14:30,574 INFO L87 Difference]: Start difference. First operand 2110 states and 2595 transitions. Second operand has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:32,244 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 42 [2021-05-06 11:14:35,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:35,612 INFO L93 Difference]: Finished difference Result 2425 states and 2980 transitions. [2021-05-06 11:14:35,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:14:35,613 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-06 11:14:35,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:35,615 INFO L225 Difference]: With dead ends: 2425 [2021-05-06 11:14:35,615 INFO L226 Difference]: Without dead ends: 2423 [2021-05-06 11:14:35,616 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 7 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1658 ImplicationChecksByTransitivity, 2431.6ms TimeCoverageRelationStatistics Valid=793, Invalid=5687, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:14:35,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2423 states. [2021-05-06 11:14:37,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2423 to 2170. [2021-05-06 11:14:37,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2170 states, 2069 states have (on average 1.2194296761720638) internal successors, (2523), 2114 states have internal predecessors, (2523), 74 states have call successors, (74), 27 states have call predecessors, (74), 26 states have return successors, (73), 28 states have call predecessors, (73), 73 states have call successors, (73) [2021-05-06 11:14:37,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2170 states to 2170 states and 2670 transitions. [2021-05-06 11:14:37,394 INFO L78 Accepts]: Start accepts. Automaton has 2170 states and 2670 transitions. Word has length 72 [2021-05-06 11:14:37,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:37,394 INFO L480 AbstractCegarLoop]: Abstraction has 2170 states and 2670 transitions. [2021-05-06 11:14:37,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 34 states have internal predecessors, (66), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:37,408 INFO L276 IsEmpty]: Start isEmpty. Operand 2170 states and 2670 transitions. [2021-05-06 11:14:37,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:14:37,411 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:37,411 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:37,411 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2021-05-06 11:14:37,411 INFO L428 AbstractCegarLoop]: === Iteration 117 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:37,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:37,411 INFO L82 PathProgramCache]: Analyzing trace with hash 2091436369, now seen corresponding path program 21 times [2021-05-06 11:14:37,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:37,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611151633] [2021-05-06 11:14:37,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:37,447 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:37,447 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:37,448 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:37,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:38,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:38,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:38,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:14:38,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:38,167 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 11:14:38,167 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:38,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611151633] [2021-05-06 11:14:38,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1611151633] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:38,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:38,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:14:38,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814496370] [2021-05-06 11:14:38,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:14:38,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:38,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:14:38,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=889, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:14:38,168 INFO L87 Difference]: Start difference. First operand 2170 states and 2670 transitions. Second operand has 33 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:42,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:42,950 INFO L93 Difference]: Finished difference Result 2387 states and 2926 transitions. [2021-05-06 11:14:42,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:14:42,950 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-06 11:14:42,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:42,952 INFO L225 Difference]: With dead ends: 2387 [2021-05-06 11:14:42,952 INFO L226 Difference]: Without dead ends: 2385 [2021-05-06 11:14:42,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1967 ImplicationChecksByTransitivity, 2268.6ms TimeCoverageRelationStatistics Valid=1049, Invalid=5271, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:14:42,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2385 states. [2021-05-06 11:14:44,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2385 to 2223. [2021-05-06 11:14:44,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2223 states, 2119 states have (on average 1.2189712128362435) internal successors, (2583), 2165 states have internal predecessors, (2583), 76 states have call successors, (76), 28 states have call predecessors, (76), 27 states have return successors, (75), 29 states have call predecessors, (75), 75 states have call successors, (75) [2021-05-06 11:14:44,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2223 states to 2223 states and 2734 transitions. [2021-05-06 11:14:44,659 INFO L78 Accepts]: Start accepts. Automaton has 2223 states and 2734 transitions. Word has length 72 [2021-05-06 11:14:44,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:44,660 INFO L480 AbstractCegarLoop]: Abstraction has 2223 states and 2734 transitions. [2021-05-06 11:14:44,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:44,660 INFO L276 IsEmpty]: Start isEmpty. Operand 2223 states and 2734 transitions. [2021-05-06 11:14:44,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:14:44,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:44,661 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 5, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:44,662 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:14:44,662 INFO L428 AbstractCegarLoop]: === Iteration 118 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:44,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:44,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1311069383, now seen corresponding path program 22 times [2021-05-06 11:14:44,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:44,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877696330] [2021-05-06 11:14:44,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:44,665 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:44,665 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:44,666 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:45,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:45,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:45,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-06 11:14:45,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:45,432 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 11:14:45,432 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:45,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877696330] [2021-05-06 11:14:45,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [877696330] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:45,432 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:45,432 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:14:45,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891309816] [2021-05-06 11:14:45,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:14:45,432 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:45,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:14:45,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:14:45,433 INFO L87 Difference]: Start difference. First operand 2223 states and 2734 transitions. Second operand has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:49,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:49,463 INFO L93 Difference]: Finished difference Result 2376 states and 2916 transitions. [2021-05-06 11:14:49,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:14:49,464 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 72 [2021-05-06 11:14:49,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:49,466 INFO L225 Difference]: With dead ends: 2376 [2021-05-06 11:14:49,466 INFO L226 Difference]: Without dead ends: 2374 [2021-05-06 11:14:49,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1574.1ms TimeCoverageRelationStatistics Valid=474, Invalid=3816, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:14:49,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2374 states. [2021-05-06 11:14:51,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2374 to 2258. [2021-05-06 11:14:51,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2258 states, 2150 states have (on average 1.218139534883721) internal successors, (2619), 2198 states have internal predecessors, (2619), 79 states have call successors, (79), 29 states have call predecessors, (79), 28 states have return successors, (78), 30 states have call predecessors, (78), 78 states have call successors, (78) [2021-05-06 11:14:51,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2258 states to 2258 states and 2776 transitions. [2021-05-06 11:14:51,235 INFO L78 Accepts]: Start accepts. Automaton has 2258 states and 2776 transitions. Word has length 72 [2021-05-06 11:14:51,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:51,235 INFO L480 AbstractCegarLoop]: Abstraction has 2258 states and 2776 transitions. [2021-05-06 11:14:51,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:14:51,235 INFO L276 IsEmpty]: Start isEmpty. Operand 2258 states and 2776 transitions. [2021-05-06 11:14:51,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:14:51,237 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:51,237 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:51,237 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2021-05-06 11:14:51,237 INFO L428 AbstractCegarLoop]: === Iteration 119 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:51,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:51,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1383260442, now seen corresponding path program 32 times [2021-05-06 11:14:51,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:51,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110358564] [2021-05-06 11:14:51,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:51,257 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:51,257 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:51,258 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:51,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:52,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:14:52,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:14:52,137 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 11:14:52,137 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:14:52,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110358564] [2021-05-06 11:14:52,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2110358564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:14:52,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:14:52,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:14:52,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578800540] [2021-05-06 11:14:52,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:14:52,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:14:52,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:14:52,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:14:52,138 INFO L87 Difference]: Start difference. First operand 2258 states and 2776 transitions. Second operand has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 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 11:14:57,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:14:57,979 INFO L93 Difference]: Finished difference Result 3004 states and 3704 transitions. [2021-05-06 11:14:57,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:14:57,979 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 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 71 [2021-05-06 11:14:57,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:14:57,982 INFO L225 Difference]: With dead ends: 3004 [2021-05-06 11:14:57,982 INFO L226 Difference]: Without dead ends: 3002 [2021-05-06 11:14:57,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 8 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 2061.5ms TimeCoverageRelationStatistics Valid=866, Invalid=3964, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:14:57,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3002 states. [2021-05-06 11:14:59,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3002 to 2302. [2021-05-06 11:14:59,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2302 states, 2189 states have (on average 1.2169940612151668) internal successors, (2664), 2240 states have internal predecessors, (2664), 82 states have call successors, (82), 31 states have call predecessors, (82), 30 states have return successors, (81), 30 states have call predecessors, (81), 81 states have call successors, (81) [2021-05-06 11:14:59,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2302 states to 2302 states and 2827 transitions. [2021-05-06 11:14:59,794 INFO L78 Accepts]: Start accepts. Automaton has 2302 states and 2827 transitions. Word has length 71 [2021-05-06 11:14:59,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:14:59,794 INFO L480 AbstractCegarLoop]: Abstraction has 2302 states and 2827 transitions. [2021-05-06 11:14:59,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 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 11:14:59,794 INFO L276 IsEmpty]: Start isEmpty. Operand 2302 states and 2827 transitions. [2021-05-06 11:14:59,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:14:59,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:14:59,797 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:14:59,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2021-05-06 11:14:59,797 INFO L428 AbstractCegarLoop]: === Iteration 120 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:14:59,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:14:59,797 INFO L82 PathProgramCache]: Analyzing trace with hash 218298293, now seen corresponding path program 25 times [2021-05-06 11:14:59,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:14:59,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722226094] [2021-05-06 11:14:59,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:14:59,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:14:59,811 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:14:59,812 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:14:59,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:00,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:00,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:00,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-06 11:15:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:00,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:15:00,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:00,467 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 11:15:00,468 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:00,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722226094] [2021-05-06 11:15:00,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [722226094] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:00,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:00,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:15:00,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865167227] [2021-05-06 11:15:00,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:15:00,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:00,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:15:00,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:15:00,469 INFO L87 Difference]: Start difference. First operand 2302 states and 2827 transitions. Second operand has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:15:06,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:06,174 INFO L93 Difference]: Finished difference Result 2629 states and 3222 transitions. [2021-05-06 11:15:06,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:15:06,174 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 74 [2021-05-06 11:15:06,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:06,177 INFO L225 Difference]: With dead ends: 2629 [2021-05-06 11:15:06,177 INFO L226 Difference]: Without dead ends: 2627 [2021-05-06 11:15:06,178 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 2161.2ms TimeCoverageRelationStatistics Valid=781, Invalid=5381, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:15:06,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2627 states. [2021-05-06 11:15:08,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2627 to 2451. [2021-05-06 11:15:08,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2451 states, 2321 states have (on average 1.211977595863852) internal successors, (2813), 2377 states have internal predecessors, (2813), 98 states have call successors, (98), 32 states have call predecessors, (98), 31 states have return successors, (97), 41 states have call predecessors, (97), 97 states have call successors, (97) [2021-05-06 11:15:08,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2451 states to 2451 states and 3008 transitions. [2021-05-06 11:15:08,425 INFO L78 Accepts]: Start accepts. Automaton has 2451 states and 3008 transitions. Word has length 74 [2021-05-06 11:15:08,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:08,425 INFO L480 AbstractCegarLoop]: Abstraction has 2451 states and 3008 transitions. [2021-05-06 11:15:08,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 31 states have internal predecessors, (63), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:15:08,425 INFO L276 IsEmpty]: Start isEmpty. Operand 2451 states and 3008 transitions. [2021-05-06 11:15:08,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:15:08,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:08,427 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:08,427 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:15:08,427 INFO L428 AbstractCegarLoop]: === Iteration 121 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:08,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:08,427 INFO L82 PathProgramCache]: Analyzing trace with hash -218179534, now seen corresponding path program 27 times [2021-05-06 11:15:08,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:08,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147946488] [2021-05-06 11:15:08,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:08,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:08,431 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:08,431 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:08,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:08,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:08,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:08,812 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 11:15:08,812 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:08,812 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147946488] [2021-05-06 11:15:08,812 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [147946488] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:08,812 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:08,812 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:15:08,812 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115833786] [2021-05-06 11:15:08,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:15:08,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:08,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:15:08,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:15:08,813 INFO L87 Difference]: Start difference. First operand 2451 states and 3008 transitions. Second operand has 24 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 22 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 11:15:17,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:17,056 INFO L93 Difference]: Finished difference Result 3447 states and 4237 transitions. [2021-05-06 11:15:17,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:15:17,057 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 22 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 72 [2021-05-06 11:15:17,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:17,060 INFO L225 Difference]: With dead ends: 3447 [2021-05-06 11:15:17,060 INFO L226 Difference]: Without dead ends: 3445 [2021-05-06 11:15:17,061 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2974 ImplicationChecksByTransitivity, 1511.1ms TimeCoverageRelationStatistics Valid=640, Invalid=8866, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:15:17,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3445 states. [2021-05-06 11:15:19,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3445 to 2643. [2021-05-06 11:15:19,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2643 states, 2499 states have (on average 1.2160864345738296) internal successors, (3039), 2565 states have internal predecessors, (3039), 108 states have call successors, (108), 36 states have call predecessors, (108), 35 states have return successors, (107), 41 states have call predecessors, (107), 107 states have call successors, (107) [2021-05-06 11:15:19,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2643 states to 2643 states and 3254 transitions. [2021-05-06 11:15:19,457 INFO L78 Accepts]: Start accepts. Automaton has 2643 states and 3254 transitions. Word has length 72 [2021-05-06 11:15:19,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:19,457 INFO L480 AbstractCegarLoop]: Abstraction has 2643 states and 3254 transitions. [2021-05-06 11:15:19,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 22 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 11:15:19,457 INFO L276 IsEmpty]: Start isEmpty. Operand 2643 states and 3254 transitions. [2021-05-06 11:15:19,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:15:19,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:19,459 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:19,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120 [2021-05-06 11:15:19,460 INFO L428 AbstractCegarLoop]: === Iteration 122 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:19,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:19,460 INFO L82 PathProgramCache]: Analyzing trace with hash 867792438, now seen corresponding path program 33 times [2021-05-06 11:15:19,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:19,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565113034] [2021-05-06 11:15:19,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:19,468 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:19,468 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:19,469 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:19,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:19,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:19,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:19,865 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 11:15:19,865 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:19,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565113034] [2021-05-06 11:15:19,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1565113034] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:19,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:19,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:15:19,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488176276] [2021-05-06 11:15:19,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:15:19,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:19,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:15:19,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:15:19,866 INFO L87 Difference]: Start difference. First operand 2643 states and 3254 transitions. Second operand has 26 states, 25 states have (on average 2.48) internal successors, (62), 24 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 11:15:24,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:24,332 INFO L93 Difference]: Finished difference Result 2827 states and 3478 transitions. [2021-05-06 11:15:24,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:15:24,333 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.48) internal successors, (62), 24 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 72 [2021-05-06 11:15:24,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:24,336 INFO L225 Difference]: With dead ends: 2827 [2021-05-06 11:15:24,336 INFO L226 Difference]: Without dead ends: 2825 [2021-05-06 11:15:24,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 1162.7ms TimeCoverageRelationStatistics Valid=597, Invalid=3435, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:15:24,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2825 states. [2021-05-06 11:15:26,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2825 to 2665. [2021-05-06 11:15:26,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2665 states, 2520 states have (on average 1.2166666666666666) internal successors, (3066), 2586 states have internal predecessors, (3066), 108 states have call successors, (108), 37 states have call predecessors, (108), 36 states have return successors, (107), 41 states have call predecessors, (107), 107 states have call successors, (107) [2021-05-06 11:15:26,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2665 states to 2665 states and 3281 transitions. [2021-05-06 11:15:26,755 INFO L78 Accepts]: Start accepts. Automaton has 2665 states and 3281 transitions. Word has length 72 [2021-05-06 11:15:26,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:26,755 INFO L480 AbstractCegarLoop]: Abstraction has 2665 states and 3281 transitions. [2021-05-06 11:15:26,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.48) internal successors, (62), 24 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 11:15:26,755 INFO L276 IsEmpty]: Start isEmpty. Operand 2665 states and 3281 transitions. [2021-05-06 11:15:26,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:15:26,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:26,757 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:26,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2021-05-06 11:15:26,757 INFO L428 AbstractCegarLoop]: === Iteration 123 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:26,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:26,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1258025424, now seen corresponding path program 34 times [2021-05-06 11:15:26,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:26,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479978178] [2021-05-06 11:15:26,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:26,761 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:26,761 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:26,761 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:26,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:27,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:27,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:27,815 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 11:15:27,815 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:27,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479978178] [2021-05-06 11:15:27,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1479978178] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:27,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:27,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:15:27,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429990199] [2021-05-06 11:15:27,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:15:27,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:27,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:15:27,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:15:27,816 INFO L87 Difference]: Start difference. First operand 2665 states and 3281 transitions. Second operand has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 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 11:15:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:33,173 INFO L93 Difference]: Finished difference Result 3000 states and 3681 transitions. [2021-05-06 11:15:33,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:15:33,174 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 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 72 [2021-05-06 11:15:33,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:33,177 INFO L225 Difference]: With dead ends: 3000 [2021-05-06 11:15:33,177 INFO L226 Difference]: Without dead ends: 2998 [2021-05-06 11:15:33,177 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1026 ImplicationChecksByTransitivity, 1666.9ms TimeCoverageRelationStatistics Valid=363, Invalid=3419, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:15:33,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2998 states. [2021-05-06 11:15:35,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2998 to 2684. [2021-05-06 11:15:35,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2684 states, 2535 states have (on average 1.2161735700197238) internal successors, (3083), 2604 states have internal predecessors, (3083), 111 states have call successors, (111), 38 states have call predecessors, (111), 37 states have return successors, (110), 41 states have call predecessors, (110), 110 states have call successors, (110) [2021-05-06 11:15:35,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2684 states to 2684 states and 3304 transitions. [2021-05-06 11:15:35,616 INFO L78 Accepts]: Start accepts. Automaton has 2684 states and 3304 transitions. Word has length 72 [2021-05-06 11:15:35,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:35,616 INFO L480 AbstractCegarLoop]: Abstraction has 2684 states and 3304 transitions. [2021-05-06 11:15:35,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 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 11:15:35,616 INFO L276 IsEmpty]: Start isEmpty. Operand 2684 states and 3304 transitions. [2021-05-06 11:15:35,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:15:35,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:35,619 INFO L523 BasicCegarLoop]: trace histogram [5, 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] [2021-05-06 11:15:35,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:15:35,619 INFO L428 AbstractCegarLoop]: === Iteration 124 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:35,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:35,619 INFO L82 PathProgramCache]: Analyzing trace with hash 139638767, now seen corresponding path program 26 times [2021-05-06 11:15:35,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:35,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976413353] [2021-05-06 11:15:35,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:35,625 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:35,625 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:35,626 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:35,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:35,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:35,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:35,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-06 11:15:35,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:35,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:15:35,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:35,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 11:15:35,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:35,967 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 11:15:35,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:35,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976413353] [2021-05-06 11:15:35,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [976413353] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:35,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:35,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:15:35,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449683361] [2021-05-06 11:15:35,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:15:35,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:35,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:15:35,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:15:35,968 INFO L87 Difference]: Start difference. First operand 2684 states and 3304 transitions. Second operand has 21 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:15:39,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:39,534 INFO L93 Difference]: Finished difference Result 2769 states and 3404 transitions. [2021-05-06 11:15:39,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:15:39,534 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 76 [2021-05-06 11:15:39,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:39,537 INFO L225 Difference]: With dead ends: 2769 [2021-05-06 11:15:39,537 INFO L226 Difference]: Without dead ends: 2767 [2021-05-06 11:15:39,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 508.5ms TimeCoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:15:39,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2767 states. [2021-05-06 11:15:42,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2767 to 2714. [2021-05-06 11:15:42,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2714 states, 2559 states have (on average 1.2141461508401719) internal successors, (3107), 2631 states have internal predecessors, (3107), 117 states have call successors, (117), 38 states have call predecessors, (117), 37 states have return successors, (116), 44 states have call predecessors, (116), 116 states have call successors, (116) [2021-05-06 11:15:42,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2714 states to 2714 states and 3340 transitions. [2021-05-06 11:15:42,074 INFO L78 Accepts]: Start accepts. Automaton has 2714 states and 3340 transitions. Word has length 76 [2021-05-06 11:15:42,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:42,075 INFO L480 AbstractCegarLoop]: Abstraction has 2714 states and 3340 transitions. [2021-05-06 11:15:42,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:15:42,075 INFO L276 IsEmpty]: Start isEmpty. Operand 2714 states and 3340 transitions. [2021-05-06 11:15:42,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:15:42,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:42,077 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:42,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable123 [2021-05-06 11:15:42,077 INFO L428 AbstractCegarLoop]: === Iteration 125 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:42,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:42,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1192708310, now seen corresponding path program 27 times [2021-05-06 11:15:42,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:42,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183722661] [2021-05-06 11:15:42,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:42,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:42,081 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:42,081 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:42,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:42,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:42,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:42,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:15:42,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:42,501 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 11:15:42,502 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:42,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183722661] [2021-05-06 11:15:42,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1183722661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:42,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:42,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:15:42,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322865136] [2021-05-06 11:15:42,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:15:42,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:42,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:15:42,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:15:42,502 INFO L87 Difference]: Start difference. First operand 2714 states and 3340 transitions. Second operand has 25 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:15:49,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:49,179 INFO L93 Difference]: Finished difference Result 3476 states and 4283 transitions. [2021-05-06 11:15:49,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:15:49,180 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:15:49,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:49,183 INFO L225 Difference]: With dead ends: 3476 [2021-05-06 11:15:49,183 INFO L226 Difference]: Without dead ends: 3474 [2021-05-06 11:15:49,184 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 7 SyntacticMatches, 12 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3179 ImplicationChecksByTransitivity, 1394.2ms TimeCoverageRelationStatistics Valid=656, Invalid=9046, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:15:49,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3474 states. [2021-05-06 11:15:51,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3474 to 2849. [2021-05-06 11:15:51,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2849 states, 2678 states have (on average 1.212471994025392) internal successors, (3247), 2760 states have internal predecessors, (3247), 131 states have call successors, (131), 40 states have call predecessors, (131), 39 states have return successors, (130), 48 states have call predecessors, (130), 130 states have call successors, (130) [2021-05-06 11:15:51,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2849 states to 2849 states and 3508 transitions. [2021-05-06 11:15:51,971 INFO L78 Accepts]: Start accepts. Automaton has 2849 states and 3508 transitions. Word has length 74 [2021-05-06 11:15:51,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:15:51,971 INFO L480 AbstractCegarLoop]: Abstraction has 2849 states and 3508 transitions. [2021-05-06 11:15:51,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:15:51,972 INFO L276 IsEmpty]: Start isEmpty. Operand 2849 states and 3508 transitions. [2021-05-06 11:15:51,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:15:51,974 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:15:51,974 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:15:51,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 11:15:51,974 INFO L428 AbstractCegarLoop]: === Iteration 126 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:15:51,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:15:51,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1837502160, now seen corresponding path program 28 times [2021-05-06 11:15:51,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:15:51,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431708748] [2021-05-06 11:15:51,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:15:51,981 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:15:51,981 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:15:51,982 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:15:51,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:52,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:15:52,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:52,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:15:52,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:15:52,453 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 11:15:52,453 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:15:52,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431708748] [2021-05-06 11:15:52,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1431708748] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:15:52,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:15:52,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:15:52,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888113664] [2021-05-06 11:15:52,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:15:52,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:15:52,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:15:52,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:15:52,454 INFO L87 Difference]: Start difference. First operand 2849 states and 3508 transitions. Second operand has 28 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:15:59,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:15:59,311 INFO L93 Difference]: Finished difference Result 3197 states and 3937 transitions. [2021-05-06 11:15:59,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:15:59,311 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:15:59,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:15:59,315 INFO L225 Difference]: With dead ends: 3197 [2021-05-06 11:15:59,315 INFO L226 Difference]: Without dead ends: 3195 [2021-05-06 11:15:59,315 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1783 ImplicationChecksByTransitivity, 1960.5ms TimeCoverageRelationStatistics Valid=818, Invalid=6154, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:15:59,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3195 states. [2021-05-06 11:16:02,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3195 to 2884. [2021-05-06 11:16:02,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2884 states, 2706 states have (on average 1.2110125646711012) internal successors, (3277), 2790 states have internal predecessors, (3277), 136 states have call successors, (136), 42 states have call predecessors, (136), 41 states have return successors, (135), 51 states have call predecessors, (135), 135 states have call successors, (135) [2021-05-06 11:16:02,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2884 states to 2884 states and 3548 transitions. [2021-05-06 11:16:02,174 INFO L78 Accepts]: Start accepts. Automaton has 2884 states and 3548 transitions. Word has length 74 [2021-05-06 11:16:02,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:02,174 INFO L480 AbstractCegarLoop]: Abstraction has 2884 states and 3548 transitions. [2021-05-06 11:16:02,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.5185185185185186) internal successors, (68), 26 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:02,174 INFO L276 IsEmpty]: Start isEmpty. Operand 2884 states and 3548 transitions. [2021-05-06 11:16:02,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:16:02,176 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:02,176 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:02,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 11:16:02,176 INFO L428 AbstractCegarLoop]: === Iteration 127 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:02,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:02,176 INFO L82 PathProgramCache]: Analyzing trace with hash -344034646, now seen corresponding path program 29 times [2021-05-06 11:16:02,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:02,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017060252] [2021-05-06 11:16:02,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:02,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:02,181 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:02,181 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:02,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:02,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:02,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:02,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:16:02,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:02,567 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 11:16:02,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:02,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017060252] [2021-05-06 11:16:02,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2017060252] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:02,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:02,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:16:02,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391035109] [2021-05-06 11:16:02,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:16:02,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:02,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:16:02,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:16:02,568 INFO L87 Difference]: Start difference. First operand 2884 states and 3548 transitions. Second operand has 26 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:07,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:07,095 INFO L93 Difference]: Finished difference Result 2984 states and 3670 transitions. [2021-05-06 11:16:07,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:16:07,096 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:16:07,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:07,099 INFO L225 Difference]: With dead ends: 2984 [2021-05-06 11:16:07,099 INFO L226 Difference]: Without dead ends: 2982 [2021-05-06 11:16:07,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 970.0ms TimeCoverageRelationStatistics Valid=381, Invalid=2375, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:16:07,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2982 states. [2021-05-06 11:16:10,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2982 to 2900. [2021-05-06 11:16:10,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2900 states, 2724 states have (on average 1.2125550660792952) internal successors, (3303), 2808 states have internal predecessors, (3303), 134 states have call successors, (134), 42 states have call predecessors, (134), 41 states have return successors, (133), 49 states have call predecessors, (133), 133 states have call successors, (133) [2021-05-06 11:16:10,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2900 states to 2900 states and 3570 transitions. [2021-05-06 11:16:10,034 INFO L78 Accepts]: Start accepts. Automaton has 2900 states and 3570 transitions. Word has length 74 [2021-05-06 11:16:10,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:10,035 INFO L480 AbstractCegarLoop]: Abstraction has 2900 states and 3570 transitions. [2021-05-06 11:16:10,035 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:10,035 INFO L276 IsEmpty]: Start isEmpty. Operand 2900 states and 3570 transitions. [2021-05-06 11:16:10,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:16:10,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:10,037 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:10,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126 [2021-05-06 11:16:10,037 INFO L428 AbstractCegarLoop]: === Iteration 128 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:10,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:10,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1166072080, now seen corresponding path program 30 times [2021-05-06 11:16:10,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:10,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042582449] [2021-05-06 11:16:10,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:10,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:10,041 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:10,042 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:10,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:10,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:10,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:16:10,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:10,694 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 11:16:10,694 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:10,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042582449] [2021-05-06 11:16:10,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2042582449] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:10,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:10,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:16:10,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425538146] [2021-05-06 11:16:10,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:16:10,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:10,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:16:10,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=815, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:16:10,695 INFO L87 Difference]: Start difference. First operand 2900 states and 3570 transitions. Second operand has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:17,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:17,510 INFO L93 Difference]: Finished difference Result 3195 states and 3932 transitions. [2021-05-06 11:16:17,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:16:17,511 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:16:17,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:17,514 INFO L225 Difference]: With dead ends: 3195 [2021-05-06 11:16:17,514 INFO L226 Difference]: Without dead ends: 3193 [2021-05-06 11:16:17,515 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1738 ImplicationChecksByTransitivity, 2104.0ms TimeCoverageRelationStatistics Valid=697, Invalid=5945, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:16:17,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3193 states. [2021-05-06 11:16:20,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3193 to 2909. [2021-05-06 11:16:20,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2909 states, 2733 states have (on average 1.212952799121844) internal successors, (3315), 2817 states have internal predecessors, (3315), 134 states have call successors, (134), 42 states have call predecessors, (134), 41 states have return successors, (133), 49 states have call predecessors, (133), 133 states have call successors, (133) [2021-05-06 11:16:20,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2909 states to 2909 states and 3582 transitions. [2021-05-06 11:16:20,435 INFO L78 Accepts]: Start accepts. Automaton has 2909 states and 3582 transitions. Word has length 74 [2021-05-06 11:16:20,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:20,435 INFO L480 AbstractCegarLoop]: Abstraction has 2909 states and 3582 transitions. [2021-05-06 11:16:20,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.2666666666666666) internal successors, (68), 29 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:20,435 INFO L276 IsEmpty]: Start isEmpty. Operand 2909 states and 3582 transitions. [2021-05-06 11:16:20,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:16:20,437 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:20,438 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:20,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127 [2021-05-06 11:16:20,438 INFO L428 AbstractCegarLoop]: === Iteration 129 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:20,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:20,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1614776572, now seen corresponding path program 31 times [2021-05-06 11:16:20,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:20,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635992424] [2021-05-06 11:16:20,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:20,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:20,442 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:20,442 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:20,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:21,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:21,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:21,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:16:21,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:21,175 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 11:16:21,175 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:21,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635992424] [2021-05-06 11:16:21,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1635992424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:21,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:21,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:16:21,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33235998] [2021-05-06 11:16:21,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:16:21,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:21,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:16:21,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:16:21,176 INFO L87 Difference]: Start difference. First operand 2909 states and 3582 transitions. Second operand has 33 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:26,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:26,597 INFO L93 Difference]: Finished difference Result 3042 states and 3738 transitions. [2021-05-06 11:16:26,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:16:26,598 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:16:26,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:26,601 INFO L225 Difference]: With dead ends: 3042 [2021-05-06 11:16:26,601 INFO L226 Difference]: Without dead ends: 3040 [2021-05-06 11:16:26,602 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1142 ImplicationChecksByTransitivity, 1495.7ms TimeCoverageRelationStatistics Valid=393, Invalid=4029, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:16:26,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3040 states. [2021-05-06 11:16:29,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3040 to 2889. [2021-05-06 11:16:29,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2889 states, 2712 states have (on average 1.2120206489675516) internal successors, (3287), 2796 states have internal predecessors, (3287), 134 states have call successors, (134), 43 states have call predecessors, (134), 42 states have return successors, (133), 49 states have call predecessors, (133), 133 states have call successors, (133) [2021-05-06 11:16:29,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2889 states to 2889 states and 3554 transitions. [2021-05-06 11:16:29,503 INFO L78 Accepts]: Start accepts. Automaton has 2889 states and 3554 transitions. Word has length 74 [2021-05-06 11:16:29,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:29,504 INFO L480 AbstractCegarLoop]: Abstraction has 2889 states and 3554 transitions. [2021-05-06 11:16:29,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.125) internal successors, (68), 31 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:29,504 INFO L276 IsEmpty]: Start isEmpty. Operand 2889 states and 3554 transitions. [2021-05-06 11:16:29,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:16:29,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:29,506 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:29,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 11:16:29,506 INFO L428 AbstractCegarLoop]: === Iteration 130 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:29,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:29,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1089485352, now seen corresponding path program 23 times [2021-05-06 11:16:29,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:29,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244737797] [2021-05-06 11:16:29,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:29,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:29,510 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:29,510 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:29,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:30,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:30,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:30,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-06 11:16:30,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:30,436 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 11:16:30,436 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:30,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244737797] [2021-05-06 11:16:30,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1244737797] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:30,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:30,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:16:30,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150652304] [2021-05-06 11:16:30,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:16:30,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:30,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:16:30,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1263, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:16:30,437 INFO L87 Difference]: Start difference. First operand 2889 states and 3554 transitions. Second operand has 38 states, 37 states have (on average 1.837837837837838) internal successors, (68), 36 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:39,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:39,097 INFO L93 Difference]: Finished difference Result 3391 states and 4165 transitions. [2021-05-06 11:16:39,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:16:39,097 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.837837837837838) internal successors, (68), 36 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 74 [2021-05-06 11:16:39,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:39,101 INFO L225 Difference]: With dead ends: 3391 [2021-05-06 11:16:39,101 INFO L226 Difference]: Without dead ends: 3389 [2021-05-06 11:16:39,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3632 ImplicationChecksByTransitivity, 3565.8ms TimeCoverageRelationStatistics Valid=1092, Invalid=10464, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:16:39,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3389 states. [2021-05-06 11:16:41,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3389 to 2904. [2021-05-06 11:16:41,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2904 states, 2730 states have (on average 1.2139194139194138) internal successors, (3314), 2814 states have internal predecessors, (3314), 131 states have call successors, (131), 43 states have call predecessors, (131), 42 states have return successors, (130), 46 states have call predecessors, (130), 130 states have call successors, (130) [2021-05-06 11:16:41,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 3575 transitions. [2021-05-06 11:16:41,934 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 3575 transitions. Word has length 74 [2021-05-06 11:16:41,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:41,934 INFO L480 AbstractCegarLoop]: Abstraction has 2904 states and 3575 transitions. [2021-05-06 11:16:41,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.837837837837838) internal successors, (68), 36 states have internal predecessors, (68), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:41,934 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 3575 transitions. [2021-05-06 11:16:41,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:16:41,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:41,936 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:41,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2021-05-06 11:16:41,937 INFO L428 AbstractCegarLoop]: === Iteration 131 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:41,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:41,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1570581088, now seen corresponding path program 24 times [2021-05-06 11:16:41,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:41,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890437900] [2021-05-06 11:16:41,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:41,945 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:41,945 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:41,945 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:41,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:42,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:42,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:42,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-06 11:16:42,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:42,713 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 11:16:42,713 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:42,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890437900] [2021-05-06 11:16:42,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [890437900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:42,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:42,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:16:42,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044863525] [2021-05-06 11:16:42,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:16:42,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:42,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:16:42,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=987, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:16:42,714 INFO L87 Difference]: Start difference. First operand 2904 states and 3575 transitions. Second operand has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:48,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:48,125 INFO L93 Difference]: Finished difference Result 3022 states and 3719 transitions. [2021-05-06 11:16:48,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:16:48,126 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 75 [2021-05-06 11:16:48,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:48,129 INFO L225 Difference]: With dead ends: 3022 [2021-05-06 11:16:48,129 INFO L226 Difference]: Without dead ends: 3020 [2021-05-06 11:16:48,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1675 ImplicationChecksByTransitivity, 1970.5ms TimeCoverageRelationStatistics Valid=931, Invalid=4471, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:16:48,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3020 states. [2021-05-06 11:16:50,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3020 to 2916. [2021-05-06 11:16:50,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2916 states, 2742 states have (on average 1.214442013129103) internal successors, (3330), 2826 states have internal predecessors, (3330), 131 states have call successors, (131), 43 states have call predecessors, (131), 42 states have return successors, (130), 46 states have call predecessors, (130), 130 states have call successors, (130) [2021-05-06 11:16:50,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2916 states to 2916 states and 3591 transitions. [2021-05-06 11:16:50,955 INFO L78 Accepts]: Start accepts. Automaton has 2916 states and 3591 transitions. Word has length 75 [2021-05-06 11:16:50,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:50,955 INFO L480 AbstractCegarLoop]: Abstraction has 2916 states and 3591 transitions. [2021-05-06 11:16:50,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:50,955 INFO L276 IsEmpty]: Start isEmpty. Operand 2916 states and 3591 transitions. [2021-05-06 11:16:50,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:16:50,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:50,957 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:50,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130 [2021-05-06 11:16:50,957 INFO L428 AbstractCegarLoop]: === Iteration 132 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:50,957 INFO L82 PathProgramCache]: Analyzing trace with hash -1589949918, now seen corresponding path program 25 times [2021-05-06 11:16:50,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:50,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053768538] [2021-05-06 11:16:50,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:50,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:50,961 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:50,961 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:50,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:51,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:51,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:51,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-06 11:16:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:51,951 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 11:16:51,951 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:51,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053768538] [2021-05-06 11:16:51,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2053768538] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:51,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:51,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:16:51,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872465828] [2021-05-06 11:16:51,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:16:51,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:51,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:16:51,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:16:51,952 INFO L87 Difference]: Start difference. First operand 2916 states and 3591 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:16:59,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:59,914 INFO L93 Difference]: Finished difference Result 3152 states and 3876 transitions. [2021-05-06 11:16:59,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 11:16:59,914 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 75 [2021-05-06 11:16:59,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:59,918 INFO L225 Difference]: With dead ends: 3152 [2021-05-06 11:16:59,918 INFO L226 Difference]: Without dead ends: 3150 [2021-05-06 11:16:59,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2875 ImplicationChecksByTransitivity, 3005.7ms TimeCoverageRelationStatistics Valid=841, Invalid=8861, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:16:59,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3150 states. [2021-05-06 11:17:02,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3150 to 2968. [2021-05-06 11:17:02,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2968 states, 2794 states have (on average 1.2151037938439513) internal successors, (3395), 2877 states have internal predecessors, (3395), 130 states have call successors, (130), 44 states have call predecessors, (130), 43 states have return successors, (129), 46 states have call predecessors, (129), 129 states have call successors, (129) [2021-05-06 11:17:02,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2968 states to 2968 states and 3654 transitions. [2021-05-06 11:17:02,748 INFO L78 Accepts]: Start accepts. Automaton has 2968 states and 3654 transitions. Word has length 75 [2021-05-06 11:17:02,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:02,748 INFO L480 AbstractCegarLoop]: Abstraction has 2968 states and 3654 transitions. [2021-05-06 11:17:02,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:17:02,749 INFO L276 IsEmpty]: Start isEmpty. Operand 2968 states and 3654 transitions. [2021-05-06 11:17:02,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:17:02,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:02,751 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:02,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 11:17:02,751 INFO L428 AbstractCegarLoop]: === Iteration 133 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:02,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:02,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1924650392, now seen corresponding path program 26 times [2021-05-06 11:17:02,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:02,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212423596] [2021-05-06 11:17:02,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:02,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:02,754 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:02,755 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:02,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:03,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:03,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:03,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-06 11:17:03,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:03,722 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 11:17:03,722 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:03,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212423596] [2021-05-06 11:17:03,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1212423596] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:03,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:03,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:17:03,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426922871] [2021-05-06 11:17:03,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:17:03,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:03,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:17:03,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1177, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:17:03,723 INFO L87 Difference]: Start difference. First operand 2968 states and 3654 transitions. Second operand has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:17:10,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:10,797 INFO L93 Difference]: Finished difference Result 3111 states and 3829 transitions. [2021-05-06 11:17:10,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:17:10,798 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 75 [2021-05-06 11:17:10,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:10,801 INFO L225 Difference]: With dead ends: 3111 [2021-05-06 11:17:10,801 INFO L226 Difference]: Without dead ends: 3109 [2021-05-06 11:17:10,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2582 ImplicationChecksByTransitivity, 2890.2ms TimeCoverageRelationStatistics Valid=824, Invalid=7732, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:17:10,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3109 states. [2021-05-06 11:17:13,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3109 to 2939. [2021-05-06 11:17:13,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2939 states, 2768 states have (on average 1.2153179190751444) internal successors, (3364), 2850 states have internal predecessors, (3364), 127 states have call successors, (127), 44 states have call predecessors, (127), 43 states have return successors, (126), 44 states have call predecessors, (126), 126 states have call successors, (126) [2021-05-06 11:17:13,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2939 states to 2939 states and 3617 transitions. [2021-05-06 11:17:13,729 INFO L78 Accepts]: Start accepts. Automaton has 2939 states and 3617 transitions. Word has length 75 [2021-05-06 11:17:13,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:13,729 INFO L480 AbstractCegarLoop]: Abstraction has 2939 states and 3617 transitions. [2021-05-06 11:17:13,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:17:13,729 INFO L276 IsEmpty]: Start isEmpty. Operand 2939 states and 3617 transitions. [2021-05-06 11:17:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:17:13,731 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:13,731 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 6, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:13,731 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132 [2021-05-06 11:17:13,731 INFO L428 AbstractCegarLoop]: === Iteration 134 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:13,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:13,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1116863854, now seen corresponding path program 27 times [2021-05-06 11:17:13,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:13,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849227372] [2021-05-06 11:17:13,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:13,735 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:13,735 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:13,736 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:13,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:14,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:14,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:14,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-06 11:17:14,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:14,533 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 11:17:14,533 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:14,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849227372] [2021-05-06 11:17:14,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1849227372] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:14,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:14,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:17:14,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841764858] [2021-05-06 11:17:14,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:17:14,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:14,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:17:14,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1007, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:17:14,534 INFO L87 Difference]: Start difference. First operand 2939 states and 3617 transitions. Second operand has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:17:22,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:22,393 INFO L93 Difference]: Finished difference Result 3213 states and 3947 transitions. [2021-05-06 11:17:22,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:17:22,393 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 75 [2021-05-06 11:17:22,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:22,396 INFO L225 Difference]: With dead ends: 3213 [2021-05-06 11:17:22,396 INFO L226 Difference]: Without dead ends: 3211 [2021-05-06 11:17:22,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2574 ImplicationChecksByTransitivity, 2613.7ms TimeCoverageRelationStatistics Valid=993, Invalid=7749, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:17:22,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3211 states. [2021-05-06 11:17:25,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3211 to 2940. [2021-05-06 11:17:25,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2940 states, 2768 states have (on average 1.214956647398844) internal successors, (3363), 2850 states have internal predecessors, (3363), 127 states have call successors, (127), 45 states have call predecessors, (127), 44 states have return successors, (126), 44 states have call predecessors, (126), 126 states have call successors, (126) [2021-05-06 11:17:25,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2940 states to 2940 states and 3616 transitions. [2021-05-06 11:17:25,226 INFO L78 Accepts]: Start accepts. Automaton has 2940 states and 3616 transitions. Word has length 75 [2021-05-06 11:17:25,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:25,226 INFO L480 AbstractCegarLoop]: Abstraction has 2940 states and 3616 transitions. [2021-05-06 11:17:25,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:17:25,226 INFO L276 IsEmpty]: Start isEmpty. Operand 2940 states and 3616 transitions. [2021-05-06 11:17:25,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:17:25,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:25,229 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:25,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133 [2021-05-06 11:17:25,229 INFO L428 AbstractCegarLoop]: === Iteration 135 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:25,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:25,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1231018404, now seen corresponding path program 32 times [2021-05-06 11:17:25,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:25,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701217677] [2021-05-06 11:17:25,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:25,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:25,232 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:25,233 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:25,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:25,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:25,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:25,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:17:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:25,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 11:17:25,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:25,768 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 11:17:25,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:25,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701217677] [2021-05-06 11:17:25,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1701217677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:25,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:25,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:17:25,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274156625] [2021-05-06 11:17:25,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:17:25,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:25,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:17:25,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:17:25,769 INFO L87 Difference]: Start difference. First operand 2940 states and 3616 transitions. Second operand has 27 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:30,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:30,395 INFO L93 Difference]: Finished difference Result 3220 states and 3959 transitions. [2021-05-06 11:17:30,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:17:30,396 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 76 [2021-05-06 11:17:30,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:30,399 INFO L225 Difference]: With dead ends: 3220 [2021-05-06 11:17:30,399 INFO L226 Difference]: Without dead ends: 3218 [2021-05-06 11:17:30,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 8 SyntacticMatches, 5 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 903.5ms TimeCoverageRelationStatistics Valid=239, Invalid=1923, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:17:30,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3218 states. [2021-05-06 11:17:33,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3218 to 3067. [2021-05-06 11:17:33,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3067 states, 2878 states have (on average 1.2126476719944406) internal successors, (3490), 2967 states have internal predecessors, (3490), 142 states have call successors, (142), 47 states have call predecessors, (142), 46 states have return successors, (141), 52 states have call predecessors, (141), 141 states have call successors, (141) [2021-05-06 11:17:33,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3067 states to 3067 states and 3773 transitions. [2021-05-06 11:17:33,505 INFO L78 Accepts]: Start accepts. Automaton has 3067 states and 3773 transitions. Word has length 76 [2021-05-06 11:17:33,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:33,506 INFO L480 AbstractCegarLoop]: Abstraction has 3067 states and 3773 transitions. [2021-05-06 11:17:33,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 25 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:33,506 INFO L276 IsEmpty]: Start isEmpty. Operand 3067 states and 3773 transitions. [2021-05-06 11:17:33,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:17:33,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:33,508 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:33,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:17:33,508 INFO L428 AbstractCegarLoop]: === Iteration 136 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:33,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:33,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1054677014, now seen corresponding path program 33 times [2021-05-06 11:17:33,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:33,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118453723] [2021-05-06 11:17:33,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:33,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:33,512 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:33,512 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:33,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:34,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:34,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:17:34,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:34,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 11:17:34,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:34,012 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 11:17:34,012 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:34,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118453723] [2021-05-06 11:17:34,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1118453723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:34,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:34,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:17:34,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559380371] [2021-05-06 11:17:34,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:17:34,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:34,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:17:34,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:17:34,013 INFO L87 Difference]: Start difference. First operand 3067 states and 3773 transitions. Second operand has 26 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:41,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:41,082 INFO L93 Difference]: Finished difference Result 3594 states and 4434 transitions. [2021-05-06 11:17:41,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:17:41,082 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 76 [2021-05-06 11:17:41,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:41,086 INFO L225 Difference]: With dead ends: 3594 [2021-05-06 11:17:41,086 INFO L226 Difference]: Without dead ends: 3592 [2021-05-06 11:17:41,086 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 8 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1468 ImplicationChecksByTransitivity, 2024.4ms TimeCoverageRelationStatistics Valid=676, Invalid=4874, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:17:41,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3592 states. [2021-05-06 11:17:44,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3592 to 3186. [2021-05-06 11:17:44,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3186 states, 2986 states have (on average 1.2136637642330876) internal successors, (3624), 3081 states have internal predecessors, (3624), 152 states have call successors, (152), 48 states have call predecessors, (152), 47 states have return successors, (151), 56 states have call predecessors, (151), 151 states have call successors, (151) [2021-05-06 11:17:44,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3186 states to 3186 states and 3927 transitions. [2021-05-06 11:17:44,437 INFO L78 Accepts]: Start accepts. Automaton has 3186 states and 3927 transitions. Word has length 76 [2021-05-06 11:17:44,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:44,437 INFO L480 AbstractCegarLoop]: Abstraction has 3186 states and 3927 transitions. [2021-05-06 11:17:44,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:44,438 INFO L276 IsEmpty]: Start isEmpty. Operand 3186 states and 3927 transitions. [2021-05-06 11:17:44,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:17:44,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:44,440 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:44,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable135 [2021-05-06 11:17:44,440 INFO L428 AbstractCegarLoop]: === Iteration 137 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:44,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:44,440 INFO L82 PathProgramCache]: Analyzing trace with hash 685222320, now seen corresponding path program 34 times [2021-05-06 11:17:44,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:44,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174212554] [2021-05-06 11:17:44,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:44,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:44,444 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:44,444 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:44,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:44,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:44,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:44,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-05-06 11:17:44,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:44,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-06 11:17:44,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:44,917 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 11:17:44,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:44,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174212554] [2021-05-06 11:17:44,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1174212554] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:44,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:44,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:17:44,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512273167] [2021-05-06 11:17:44,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:17:44,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:44,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:17:44,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=563, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:17:44,917 INFO L87 Difference]: Start difference. First operand 3186 states and 3927 transitions. Second operand has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:50,250 INFO L93 Difference]: Finished difference Result 3332 states and 4100 transitions. [2021-05-06 11:17:50,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:17:50,250 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 76 [2021-05-06 11:17:50,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:50,253 INFO L225 Difference]: With dead ends: 3332 [2021-05-06 11:17:50,253 INFO L226 Difference]: Without dead ends: 3330 [2021-05-06 11:17:50,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1089.7ms TimeCoverageRelationStatistics Valid=390, Invalid=2366, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:17:50,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3330 states. [2021-05-06 11:17:53,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3330 to 3194. [2021-05-06 11:17:53,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3194 states, 2992 states have (on average 1.213235294117647) internal successors, (3630), 3087 states have internal predecessors, (3630), 153 states have call successors, (153), 49 states have call predecessors, (153), 48 states have return successors, (152), 57 states have call predecessors, (152), 152 states have call successors, (152) [2021-05-06 11:17:53,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3194 states to 3194 states and 3935 transitions. [2021-05-06 11:17:53,661 INFO L78 Accepts]: Start accepts. Automaton has 3194 states and 3935 transitions. Word has length 76 [2021-05-06 11:17:53,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:17:53,661 INFO L480 AbstractCegarLoop]: Abstraction has 3194 states and 3935 transitions. [2021-05-06 11:17:53,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.6) internal successors, (65), 24 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:17:53,661 INFO L276 IsEmpty]: Start isEmpty. Operand 3194 states and 3935 transitions. [2021-05-06 11:17:53,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:17:53,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:17:53,663 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:17:53,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2021-05-06 11:17:53,664 INFO L428 AbstractCegarLoop]: === Iteration 138 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:17:53,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:17:53,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1829961377, now seen corresponding path program 35 times [2021-05-06 11:17:53,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:17:53,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632829095] [2021-05-06 11:17:53,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:17:53,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:17:53,667 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:17:53,668 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:17:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:54,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:17:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:17:54,212 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 11:17:54,212 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:17:54,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632829095] [2021-05-06 11:17:54,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1632829095] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:17:54,212 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:17:54,212 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:17:54,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610386476] [2021-05-06 11:17:54,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:17:54,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:17:54,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:17:54,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=690, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:17:54,213 INFO L87 Difference]: Start difference. First operand 3194 states and 3935 transitions. Second operand has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 11:17:59,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:17:59,941 INFO L93 Difference]: Finished difference Result 3441 states and 4238 transitions. [2021-05-06 11:17:59,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:17:59,942 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 74 [2021-05-06 11:17:59,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:17:59,945 INFO L225 Difference]: With dead ends: 3441 [2021-05-06 11:17:59,945 INFO L226 Difference]: Without dead ends: 3439 [2021-05-06 11:17:59,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 758 ImplicationChecksByTransitivity, 1217.3ms TimeCoverageRelationStatistics Valid=701, Invalid=2721, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:17:59,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3439 states. [2021-05-06 11:18:03,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3439 to 3249. [2021-05-06 11:18:03,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3249 states, 3040 states have (on average 1.2125) internal successors, (3686), 3139 states have internal predecessors, (3686), 157 states have call successors, (157), 52 states have call predecessors, (157), 51 states have return successors, (156), 57 states have call predecessors, (156), 156 states have call successors, (156) [2021-05-06 11:18:03,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3249 states to 3249 states and 3999 transitions. [2021-05-06 11:18:03,452 INFO L78 Accepts]: Start accepts. Automaton has 3249 states and 3999 transitions. Word has length 74 [2021-05-06 11:18:03,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:03,452 INFO L480 AbstractCegarLoop]: Abstraction has 3249 states and 3999 transitions. [2021-05-06 11:18:03,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 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 11:18:03,452 INFO L276 IsEmpty]: Start isEmpty. Operand 3249 states and 3999 transitions. [2021-05-06 11:18:03,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:18:03,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:03,455 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:03,455 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 11:18:03,455 INFO L428 AbstractCegarLoop]: === Iteration 139 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:03,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:03,455 INFO L82 PathProgramCache]: Analyzing trace with hash 595829093, now seen corresponding path program 36 times [2021-05-06 11:18:03,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:03,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780323078] [2021-05-06 11:18:03,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:03,460 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:18:03,460 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:18:03,461 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:18:03,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:04,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:04,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:04,459 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 11:18:04,460 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:04,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780323078] [2021-05-06 11:18:04,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1780323078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:04,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:04,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:18:04,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600095574] [2021-05-06 11:18:04,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:18:04,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:04,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:18:04,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1028, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:18:04,461 INFO L87 Difference]: Start difference. First operand 3249 states and 3999 transitions. Second operand has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 11:18:11,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:11,670 INFO L93 Difference]: Finished difference Result 4027 states and 4960 transitions. [2021-05-06 11:18:11,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:18:11,671 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 74 [2021-05-06 11:18:11,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:11,675 INFO L225 Difference]: With dead ends: 4027 [2021-05-06 11:18:11,675 INFO L226 Difference]: Without dead ends: 4025 [2021-05-06 11:18:11,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 6 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1201 ImplicationChecksByTransitivity, 1676.4ms TimeCoverageRelationStatistics Valid=510, Invalid=3912, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:18:11,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4025 states. [2021-05-06 11:18:15,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4025 to 3330. [2021-05-06 11:18:15,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3330 states, 3114 states have (on average 1.2129094412331407) internal successors, (3777), 3217 states have internal predecessors, (3777), 161 states have call successors, (161), 55 states have call predecessors, (161), 54 states have return successors, (160), 57 states have call predecessors, (160), 160 states have call successors, (160) [2021-05-06 11:18:15,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3330 states to 3330 states and 4098 transitions. [2021-05-06 11:18:15,295 INFO L78 Accepts]: Start accepts. Automaton has 3330 states and 4098 transitions. Word has length 74 [2021-05-06 11:18:15,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:15,296 INFO L480 AbstractCegarLoop]: Abstraction has 3330 states and 4098 transitions. [2021-05-06 11:18:15,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 11:18:15,296 INFO L276 IsEmpty]: Start isEmpty. Operand 3330 states and 4098 transitions. [2021-05-06 11:18:15,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:18:15,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:15,299 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:15,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138 [2021-05-06 11:18:15,299 INFO L428 AbstractCegarLoop]: === Iteration 140 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:15,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:15,299 INFO L82 PathProgramCache]: Analyzing trace with hash -853594761, now seen corresponding path program 37 times [2021-05-06 11:18:15,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:15,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801990160] [2021-05-06 11:18:15,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:15,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:18:15,317 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:18:15,317 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:18:15,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:16,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:16,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:16,150 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 11:18:16,150 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:16,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801990160] [2021-05-06 11:18:16,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [801990160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:16,150 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:16,150 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:18:16,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555101557] [2021-05-06 11:18:16,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:18:16,151 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:16,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:18:16,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:18:16,151 INFO L87 Difference]: Start difference. First operand 3330 states and 4098 transitions. Second operand has 32 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 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 11:18:23,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:23,331 INFO L93 Difference]: Finished difference Result 4012 states and 4937 transitions. [2021-05-06 11:18:23,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:18:23,332 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 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 74 [2021-05-06 11:18:23,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:23,336 INFO L225 Difference]: With dead ends: 4012 [2021-05-06 11:18:23,336 INFO L226 Difference]: Without dead ends: 4010 [2021-05-06 11:18:23,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 5 SyntacticMatches, 13 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1650.0ms TimeCoverageRelationStatistics Valid=575, Invalid=3847, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:18:23,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4010 states. [2021-05-06 11:18:26,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4010 to 3374. [2021-05-06 11:18:26,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3374 states, 3153 states have (on average 1.2124960355217254) internal successors, (3823), 3257 states have internal predecessors, (3823), 162 states have call successors, (162), 59 states have call predecessors, (162), 58 states have return successors, (161), 57 states have call predecessors, (161), 161 states have call successors, (161) [2021-05-06 11:18:26,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3374 states to 3374 states and 4146 transitions. [2021-05-06 11:18:26,981 INFO L78 Accepts]: Start accepts. Automaton has 3374 states and 4146 transitions. Word has length 74 [2021-05-06 11:18:26,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:26,981 INFO L480 AbstractCegarLoop]: Abstraction has 3374 states and 4146 transitions. [2021-05-06 11:18:26,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 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 11:18:26,981 INFO L276 IsEmpty]: Start isEmpty. Operand 3374 states and 4146 transitions. [2021-05-06 11:18:26,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:18:26,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:26,984 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:26,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 11:18:26,984 INFO L428 AbstractCegarLoop]: === Iteration 141 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:26,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:26,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1068023735, now seen corresponding path program 38 times [2021-05-06 11:18:26,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:26,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124371253] [2021-05-06 11:18:26,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:26,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:18:26,987 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:18:26,988 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:18:27,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:27,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:27,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:27,925 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 11:18:27,926 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:27,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124371253] [2021-05-06 11:18:27,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [124371253] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:27,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:27,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:18:27,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241951425] [2021-05-06 11:18:27,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:18:27,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:27,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:18:27,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=913, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:18:27,927 INFO L87 Difference]: Start difference. First operand 3374 states and 4146 transitions. Second operand has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 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 11:18:35,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:35,362 INFO L93 Difference]: Finished difference Result 4145 states and 5097 transitions. [2021-05-06 11:18:35,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:18:35,363 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 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 74 [2021-05-06 11:18:35,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:35,367 INFO L225 Difference]: With dead ends: 4145 [2021-05-06 11:18:35,367 INFO L226 Difference]: Without dead ends: 4143 [2021-05-06 11:18:35,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 6 SyntacticMatches, 11 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 1796.3ms TimeCoverageRelationStatistics Valid=512, Invalid=4044, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:18:35,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4143 states. [2021-05-06 11:18:39,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4143 to 3395. [2021-05-06 11:18:39,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3395 states, 3174 states have (on average 1.2132955261499685) internal successors, (3851), 3278 states have internal predecessors, (3851), 162 states have call successors, (162), 59 states have call predecessors, (162), 58 states have return successors, (161), 57 states have call predecessors, (161), 161 states have call successors, (161) [2021-05-06 11:18:39,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3395 states to 3395 states and 4174 transitions. [2021-05-06 11:18:39,030 INFO L78 Accepts]: Start accepts. Automaton has 3395 states and 4174 transitions. Word has length 74 [2021-05-06 11:18:39,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:39,031 INFO L480 AbstractCegarLoop]: Abstraction has 3395 states and 4174 transitions. [2021-05-06 11:18:39,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 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 11:18:39,031 INFO L276 IsEmpty]: Start isEmpty. Operand 3395 states and 4174 transitions. [2021-05-06 11:18:39,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:18:39,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:39,034 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 7, 6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:39,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 11:18:39,034 INFO L428 AbstractCegarLoop]: === Iteration 142 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:39,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:39,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1858839031, now seen corresponding path program 39 times [2021-05-06 11:18:39,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:39,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002498989] [2021-05-06 11:18:39,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:39,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:18:39,037 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:18:39,038 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:18:39,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:40,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:40,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:40,004 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 11:18:40,004 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:40,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002498989] [2021-05-06 11:18:40,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2002498989] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:40,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:40,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:18:40,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509445086] [2021-05-06 11:18:40,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:18:40,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:40,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:18:40,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1029, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:18:40,005 INFO L87 Difference]: Start difference. First operand 3395 states and 4174 transitions. Second operand has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 11:18:47,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:47,422 INFO L93 Difference]: Finished difference Result 3628 states and 4450 transitions. [2021-05-06 11:18:47,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:18:47,423 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 74 [2021-05-06 11:18:47,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:47,427 INFO L225 Difference]: With dead ends: 3628 [2021-05-06 11:18:47,427 INFO L226 Difference]: Without dead ends: 3626 [2021-05-06 11:18:47,427 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 5 SyntacticMatches, 10 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1578 ImplicationChecksByTransitivity, 1926.0ms TimeCoverageRelationStatistics Valid=598, Invalid=5102, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:18:47,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3626 states. [2021-05-06 11:18:51,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3626 to 3421. [2021-05-06 11:18:51,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3421 states, 3196 states have (on average 1.213078848560701) internal successors, (3877), 3302 states have internal predecessors, (3877), 164 states have call successors, (164), 61 states have call predecessors, (164), 60 states have return successors, (163), 57 states have call predecessors, (163), 163 states have call successors, (163) [2021-05-06 11:18:51,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3421 states to 3421 states and 4204 transitions. [2021-05-06 11:18:51,214 INFO L78 Accepts]: Start accepts. Automaton has 3421 states and 4204 transitions. Word has length 74 [2021-05-06 11:18:51,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:18:51,215 INFO L480 AbstractCegarLoop]: Abstraction has 3421 states and 4204 transitions. [2021-05-06 11:18:51,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 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 11:18:51,215 INFO L276 IsEmpty]: Start isEmpty. Operand 3421 states and 4204 transitions. [2021-05-06 11:18:51,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:18:51,217 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:18:51,217 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:18:51,217 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141 [2021-05-06 11:18:51,217 INFO L428 AbstractCegarLoop]: === Iteration 143 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:18:51,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:18:51,218 INFO L82 PathProgramCache]: Analyzing trace with hash 299739794, now seen corresponding path program 35 times [2021-05-06 11:18:51,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:18:51,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797469595] [2021-05-06 11:18:51,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:18:51,221 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:18:51,221 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:18:51,221 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:18:51,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:51,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:18:51,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:51,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:18:51,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:51,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:18:51,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:18:51,879 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 11:18:51,879 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:18:51,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797469595] [2021-05-06 11:18:51,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1797469595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:18:51,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:18:51,879 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:18:51,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55072503] [2021-05-06 11:18:51,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:18:51,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:18:51,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:18:51,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:18:51,880 INFO L87 Difference]: Start difference. First operand 3421 states and 4204 transitions. Second operand has 33 states, 32 states have (on average 2.0625) internal successors, (66), 31 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:18:58,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:18:58,921 INFO L93 Difference]: Finished difference Result 3669 states and 4511 transitions. [2021-05-06 11:18:58,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:18:58,922 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.0625) internal successors, (66), 31 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 77 [2021-05-06 11:18:58,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:18:58,925 INFO L225 Difference]: With dead ends: 3669 [2021-05-06 11:18:58,925 INFO L226 Difference]: Without dead ends: 3667 [2021-05-06 11:18:58,926 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 1987.4ms TimeCoverageRelationStatistics Valid=735, Invalid=4965, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:18:58,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3667 states. [2021-05-06 11:19:02,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3667 to 3556. [2021-05-06 11:19:02,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3556 states, 3326 states have (on average 1.2134696331930246) internal successors, (4036), 3437 states have internal predecessors, (4036), 169 states have call successors, (169), 61 states have call predecessors, (169), 60 states have return successors, (168), 57 states have call predecessors, (168), 168 states have call successors, (168) [2021-05-06 11:19:02,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3556 states to 3556 states and 4373 transitions. [2021-05-06 11:19:02,737 INFO L78 Accepts]: Start accepts. Automaton has 3556 states and 4373 transitions. Word has length 77 [2021-05-06 11:19:02,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:02,737 INFO L480 AbstractCegarLoop]: Abstraction has 3556 states and 4373 transitions. [2021-05-06 11:19:02,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.0625) internal successors, (66), 31 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:19:02,737 INFO L276 IsEmpty]: Start isEmpty. Operand 3556 states and 4373 transitions. [2021-05-06 11:19:02,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:19:02,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:02,740 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:02,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2021-05-06 11:19:02,740 INFO L428 AbstractCegarLoop]: === Iteration 144 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:02,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:02,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1673496460, now seen corresponding path program 36 times [2021-05-06 11:19:02,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:02,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716431924] [2021-05-06 11:19:02,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:02,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:02,743 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:02,744 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:02,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:03,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:03,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:03,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-06 11:19:03,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:03,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:19:03,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:03,433 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 11:19:03,433 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:03,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716431924] [2021-05-06 11:19:03,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1716431924] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:03,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:03,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:19:03,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416074417] [2021-05-06 11:19:03,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:19:03,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:03,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:19:03,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:19:03,434 INFO L87 Difference]: Start difference. First operand 3556 states and 4373 transitions. Second operand has 31 states, 30 states have (on average 2.2) internal successors, (66), 29 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:19:10,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:10,653 INFO L93 Difference]: Finished difference Result 3697 states and 4546 transitions. [2021-05-06 11:19:10,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:19:10,653 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.2) internal successors, (66), 29 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 77 [2021-05-06 11:19:10,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:10,657 INFO L225 Difference]: With dead ends: 3697 [2021-05-06 11:19:10,657 INFO L226 Difference]: Without dead ends: 3695 [2021-05-06 11:19:10,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 1542.4ms TimeCoverageRelationStatistics Valid=461, Invalid=4369, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:19:10,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3695 states. [2021-05-06 11:19:14,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3695 to 3496. [2021-05-06 11:19:14,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3496 states, 3269 states have (on average 1.214132762312634) internal successors, (3969), 3381 states have internal predecessors, (3969), 166 states have call successors, (166), 61 states have call predecessors, (166), 60 states have return successors, (165), 53 states have call predecessors, (165), 165 states have call successors, (165) [2021-05-06 11:19:14,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3496 states to 3496 states and 4300 transitions. [2021-05-06 11:19:14,332 INFO L78 Accepts]: Start accepts. Automaton has 3496 states and 4300 transitions. Word has length 77 [2021-05-06 11:19:14,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:14,332 INFO L480 AbstractCegarLoop]: Abstraction has 3496 states and 4300 transitions. [2021-05-06 11:19:14,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 2.2) internal successors, (66), 29 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:19:14,332 INFO L276 IsEmpty]: Start isEmpty. Operand 3496 states and 4300 transitions. [2021-05-06 11:19:14,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:19:14,335 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:14,335 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:14,335 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 11:19:14,335 INFO L428 AbstractCegarLoop]: === Iteration 145 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:14,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:14,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1176831703, now seen corresponding path program 28 times [2021-05-06 11:19:14,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:14,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716697582] [2021-05-06 11:19:14,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:14,338 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:14,339 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:14,339 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:14,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:14,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:14,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:14,425 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 11:19:14,426 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:14,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716697582] [2021-05-06 11:19:14,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [716697582] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:14,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:14,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:19:14,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623738465] [2021-05-06 11:19:14,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:19:14,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:14,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:19:14,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:19:14,426 INFO L87 Difference]: Start difference. First operand 3496 states and 4300 transitions. Second operand has 15 states, 15 states have (on average 4.066666666666666) internal successors, (61), 14 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 11:19:20,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:20,393 INFO L93 Difference]: Finished difference Result 4038 states and 4971 transitions. [2021-05-06 11:19:20,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:19:20,393 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.066666666666666) internal successors, (61), 14 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 75 [2021-05-06 11:19:20,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:20,397 INFO L225 Difference]: With dead ends: 4038 [2021-05-06 11:19:20,398 INFO L226 Difference]: Without dead ends: 3968 [2021-05-06 11:19:20,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 229.8ms TimeCoverageRelationStatistics Valid=522, Invalid=1038, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:19:20,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3968 states. [2021-05-06 11:19:24,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3968 to 3484. [2021-05-06 11:19:24,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3484 states, 3257 states have (on average 1.2124654590113602) internal successors, (3949), 3369 states have internal predecessors, (3949), 166 states have call successors, (166), 61 states have call predecessors, (166), 60 states have return successors, (165), 53 states have call predecessors, (165), 165 states have call successors, (165) [2021-05-06 11:19:24,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3484 states to 3484 states and 4280 transitions. [2021-05-06 11:19:24,060 INFO L78 Accepts]: Start accepts. Automaton has 3484 states and 4280 transitions. Word has length 75 [2021-05-06 11:19:24,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:24,060 INFO L480 AbstractCegarLoop]: Abstraction has 3484 states and 4280 transitions. [2021-05-06 11:19:24,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.066666666666666) internal successors, (61), 14 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 11:19:24,060 INFO L276 IsEmpty]: Start isEmpty. Operand 3484 states and 4280 transitions. [2021-05-06 11:19:24,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:19:24,063 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:24,063 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:24,063 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2021-05-06 11:19:24,063 INFO L428 AbstractCegarLoop]: === Iteration 146 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:24,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:24,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1961994255, now seen corresponding path program 40 times [2021-05-06 11:19:24,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:24,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033242886] [2021-05-06 11:19:24,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:24,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:24,067 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:24,068 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:24,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:24,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:24,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:24,929 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 11:19:24,929 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:24,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033242886] [2021-05-06 11:19:24,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1033242886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:24,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:24,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:19:24,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779637156] [2021-05-06 11:19:24,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:19:24,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:24,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:19:24,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:19:24,930 INFO L87 Difference]: Start difference. First operand 3484 states and 4280 transitions. Second operand has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 27 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:31,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:31,221 INFO L93 Difference]: Finished difference Result 3693 states and 4534 transitions. [2021-05-06 11:19:31,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:19:31,221 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 27 states have internal predecessors, (71), 2 states have call successors, (3), 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 11:19:31,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:31,225 INFO L225 Difference]: With dead ends: 3693 [2021-05-06 11:19:31,225 INFO L226 Difference]: Without dead ends: 3691 [2021-05-06 11:19:31,225 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 1350.8ms TimeCoverageRelationStatistics Valid=293, Invalid=2787, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:19:31,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3691 states. [2021-05-06 11:19:34,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3691 to 3481. [2021-05-06 11:19:34,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3481 states, 3255 states have (on average 1.2125960061443932) internal successors, (3947), 3366 states have internal predecessors, (3947), 165 states have call successors, (165), 61 states have call predecessors, (165), 60 states have return successors, (164), 53 states have call predecessors, (164), 164 states have call successors, (164) [2021-05-06 11:19:34,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3481 states to 3481 states and 4276 transitions. [2021-05-06 11:19:34,869 INFO L78 Accepts]: Start accepts. Automaton has 3481 states and 4276 transitions. Word has length 75 [2021-05-06 11:19:34,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:34,869 INFO L480 AbstractCegarLoop]: Abstraction has 3481 states and 4276 transitions. [2021-05-06 11:19:34,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 27 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:34,869 INFO L276 IsEmpty]: Start isEmpty. Operand 3481 states and 4276 transitions. [2021-05-06 11:19:34,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:19:34,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:34,872 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:34,872 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145 [2021-05-06 11:19:34,872 INFO L428 AbstractCegarLoop]: === Iteration 147 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:34,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:34,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1330691474, now seen corresponding path program 37 times [2021-05-06 11:19:34,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:34,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48199849] [2021-05-06 11:19:34,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:34,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:34,880 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:34,881 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:34,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:35,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:35,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:35,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-06 11:19:35,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:35,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:19:35,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:35,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 11:19:35,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:35,495 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 11:19:35,495 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:35,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48199849] [2021-05-06 11:19:35,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [48199849] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:35,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:35,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:19:35,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205750815] [2021-05-06 11:19:35,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:19:35,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:35,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:19:35,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:19:35,496 INFO L87 Difference]: Start difference. First operand 3481 states and 4276 transitions. Second operand has 26 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:19:40,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:40,939 INFO L93 Difference]: Finished difference Result 3667 states and 4508 transitions. [2021-05-06 11:19:40,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:19:40,939 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 79 [2021-05-06 11:19:40,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:40,943 INFO L225 Difference]: With dead ends: 3667 [2021-05-06 11:19:40,943 INFO L226 Difference]: Without dead ends: 3665 [2021-05-06 11:19:40,943 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 10 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 837.4ms TimeCoverageRelationStatistics Valid=189, Invalid=1533, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:19:40,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3665 states. [2021-05-06 11:19:44,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3665 to 3596. [2021-05-06 11:19:44,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3596 states, 3357 states have (on average 1.2117962466487935) internal successors, (4068), 3477 states have internal predecessors, (4068), 178 states have call successors, (178), 61 states have call predecessors, (178), 60 states have return successors, (177), 57 states have call predecessors, (177), 177 states have call successors, (177) [2021-05-06 11:19:44,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3596 states to 3596 states and 4423 transitions. [2021-05-06 11:19:44,935 INFO L78 Accepts]: Start accepts. Automaton has 3596 states and 4423 transitions. Word has length 79 [2021-05-06 11:19:44,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:44,935 INFO L480 AbstractCegarLoop]: Abstraction has 3596 states and 4423 transitions. [2021-05-06 11:19:44,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.52) internal successors, (63), 24 states have internal predecessors, (63), 5 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:19:44,935 INFO L276 IsEmpty]: Start isEmpty. Operand 3596 states and 4423 transitions. [2021-05-06 11:19:44,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:19:44,939 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:44,939 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:44,939 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 11:19:44,939 INFO L428 AbstractCegarLoop]: === Iteration 148 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:44,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:44,939 INFO L82 PathProgramCache]: Analyzing trace with hash -616705905, now seen corresponding path program 38 times [2021-05-06 11:19:44,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:44,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788419072] [2021-05-06 11:19:44,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:44,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:44,943 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:44,944 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:44,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:45,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:45,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:45,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:19:45,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:45,233 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 11:19:45,233 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:45,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788419072] [2021-05-06 11:19:45,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1788419072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:45,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:45,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:19:45,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508170307] [2021-05-06 11:19:45,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:19:45,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:45,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:19:45,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:19:45,234 INFO L87 Difference]: Start difference. First operand 3596 states and 4423 transitions. Second operand has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:19:52,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:19:52,517 INFO L93 Difference]: Finished difference Result 4106 states and 5054 transitions. [2021-05-06 11:19:52,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:19:52,518 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:19:52,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:19:52,522 INFO L225 Difference]: With dead ends: 4106 [2021-05-06 11:19:52,522 INFO L226 Difference]: Without dead ends: 4104 [2021-05-06 11:19:52,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1381 ImplicationChecksByTransitivity, 961.5ms TimeCoverageRelationStatistics Valid=1014, Invalid=3956, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:19:52,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4104 states. [2021-05-06 11:19:56,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4104 to 3613. [2021-05-06 11:19:56,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3613 states, 3370 states have (on average 1.210979228486647) internal successors, (4081), 3490 states have internal predecessors, (4081), 181 states have call successors, (181), 62 states have call predecessors, (181), 61 states have return successors, (180), 60 states have call predecessors, (180), 180 states have call successors, (180) [2021-05-06 11:19:56,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3613 states to 3613 states and 4442 transitions. [2021-05-06 11:19:56,591 INFO L78 Accepts]: Start accepts. Automaton has 3613 states and 4442 transitions. Word has length 77 [2021-05-06 11:19:56,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:19:56,591 INFO L480 AbstractCegarLoop]: Abstraction has 3613 states and 4442 transitions. [2021-05-06 11:19:56,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:19:56,592 INFO L276 IsEmpty]: Start isEmpty. Operand 3613 states and 4442 transitions. [2021-05-06 11:19:56,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:19:56,594 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:19:56,594 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:19:56,594 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable147 [2021-05-06 11:19:56,595 INFO L428 AbstractCegarLoop]: === Iteration 149 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:19:56,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:19:56,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1718423753, now seen corresponding path program 39 times [2021-05-06 11:19:56,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:19:56,595 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320847503] [2021-05-06 11:19:56,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:19:56,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:19:56,598 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:19:56,599 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:56,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:56,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:56,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:56,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:19:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:56,971 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 11:19:56,971 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:56,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320847503] [2021-05-06 11:19:56,971 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1320847503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:56,971 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:56,971 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:19:56,971 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666493171] [2021-05-06 11:19:56,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:19:56,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:56,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:19:56,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=500, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:19:56,972 INFO L87 Difference]: Start difference. First operand 3613 states and 4442 transitions. Second operand has 24 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:03,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:03,276 INFO L93 Difference]: Finished difference Result 3771 states and 4631 transitions. [2021-05-06 11:20:03,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:20:03,277 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:20:03,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:03,281 INFO L225 Difference]: With dead ends: 3771 [2021-05-06 11:20:03,281 INFO L226 Difference]: Without dead ends: 3769 [2021-05-06 11:20:03,282 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 6 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 902.6ms TimeCoverageRelationStatistics Valid=257, Invalid=2193, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:20:03,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3769 states. [2021-05-06 11:20:07,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3769 to 3613. [2021-05-06 11:20:07,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3613 states, 3370 states have (on average 1.210979228486647) internal successors, (4081), 3490 states have internal predecessors, (4081), 181 states have call successors, (181), 62 states have call predecessors, (181), 61 states have return successors, (180), 60 states have call predecessors, (180), 180 states have call successors, (180) [2021-05-06 11:20:07,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3613 states to 3613 states and 4442 transitions. [2021-05-06 11:20:07,619 INFO L78 Accepts]: Start accepts. Automaton has 3613 states and 4442 transitions. Word has length 77 [2021-05-06 11:20:07,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:07,620 INFO L480 AbstractCegarLoop]: Abstraction has 3613 states and 4442 transitions. [2021-05-06 11:20:07,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 3.0869565217391304) internal successors, (71), 22 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:07,620 INFO L276 IsEmpty]: Start isEmpty. Operand 3613 states and 4442 transitions. [2021-05-06 11:20:07,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:20:07,623 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:07,623 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:07,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2021-05-06 11:20:07,623 INFO L428 AbstractCegarLoop]: === Iteration 150 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:07,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:07,623 INFO L82 PathProgramCache]: Analyzing trace with hash 2042914063, now seen corresponding path program 40 times [2021-05-06 11:20:07,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:07,623 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461721804] [2021-05-06 11:20:07,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:07,626 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:07,626 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:07,627 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:07,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:08,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:08,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:08,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:20:08,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:08,331 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 11:20:08,331 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:08,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461721804] [2021-05-06 11:20:08,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [461721804] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:08,331 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:08,331 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:20:08,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71210252] [2021-05-06 11:20:08,332 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:20:08,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:08,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:20:08,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:20:08,332 INFO L87 Difference]: Start difference. First operand 3613 states and 4442 transitions. Second operand has 28 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:15,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:15,904 INFO L93 Difference]: Finished difference Result 3865 states and 4743 transitions. [2021-05-06 11:20:15,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:20:15,909 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:20:15,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:15,913 INFO L225 Difference]: With dead ends: 3865 [2021-05-06 11:20:15,913 INFO L226 Difference]: Without dead ends: 3863 [2021-05-06 11:20:15,913 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1234.4ms TimeCoverageRelationStatistics Valid=306, Invalid=2664, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:20:15,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3863 states. [2021-05-06 11:20:20,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3863 to 3656. [2021-05-06 11:20:20,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3656 states, 3403 states have (on average 1.2089332941522186) internal successors, (4114), 3526 states have internal predecessors, (4114), 189 states have call successors, (189), 64 states have call predecessors, (189), 63 states have return successors, (188), 65 states have call predecessors, (188), 188 states have call successors, (188) [2021-05-06 11:20:20,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3656 states to 3656 states and 4491 transitions. [2021-05-06 11:20:20,345 INFO L78 Accepts]: Start accepts. Automaton has 3656 states and 4491 transitions. Word has length 77 [2021-05-06 11:20:20,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:20,346 INFO L480 AbstractCegarLoop]: Abstraction has 3656 states and 4491 transitions. [2021-05-06 11:20:20,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 2.6296296296296298) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:20,346 INFO L276 IsEmpty]: Start isEmpty. Operand 3656 states and 4491 transitions. [2021-05-06 11:20:20,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:20:20,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:20,349 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:20,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:20:20,349 INFO L428 AbstractCegarLoop]: === Iteration 151 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:20,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:20,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1751824959, now seen corresponding path program 28 times [2021-05-06 11:20:20,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:20,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086333832] [2021-05-06 11:20:20,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:20,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:20,352 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:20,353 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:20,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:21,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:21,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:21,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:20:21,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:21,467 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 11:20:21,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:21,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086333832] [2021-05-06 11:20:21,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086333832] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:21,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:21,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:20:21,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161574265] [2021-05-06 11:20:21,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:20:21,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:21,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:20:21,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:20:21,468 INFO L87 Difference]: Start difference. First operand 3656 states and 4491 transitions. Second operand has 40 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:31,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:31,288 INFO L93 Difference]: Finished difference Result 4094 states and 5032 transitions. [2021-05-06 11:20:31,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:20:31,288 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:20:31,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:31,292 INFO L225 Difference]: With dead ends: 4094 [2021-05-06 11:20:31,296 INFO L226 Difference]: Without dead ends: 4092 [2021-05-06 11:20:31,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 8 SyntacticMatches, 6 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3045 ImplicationChecksByTransitivity, 3371.5ms TimeCoverageRelationStatistics Valid=1151, Invalid=8749, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:20:31,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4092 states. [2021-05-06 11:20:35,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4092 to 3646. [2021-05-06 11:20:35,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3646 states, 3395 states have (on average 1.2094256259204712) internal successors, (4106), 3517 states have internal predecessors, (4106), 187 states have call successors, (187), 64 states have call predecessors, (187), 63 states have return successors, (186), 64 states have call predecessors, (186), 186 states have call successors, (186) [2021-05-06 11:20:35,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3646 states to 3646 states and 4479 transitions. [2021-05-06 11:20:35,849 INFO L78 Accepts]: Start accepts. Automaton has 3646 states and 4479 transitions. Word has length 77 [2021-05-06 11:20:35,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:35,850 INFO L480 AbstractCegarLoop]: Abstraction has 3646 states and 4479 transitions. [2021-05-06 11:20:35,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:35,850 INFO L276 IsEmpty]: Start isEmpty. Operand 3646 states and 4479 transitions. [2021-05-06 11:20:35,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:20:35,853 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:35,853 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:35,853 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150 [2021-05-06 11:20:35,853 INFO L428 AbstractCegarLoop]: === Iteration 152 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:35,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:35,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1721104903, now seen corresponding path program 29 times [2021-05-06 11:20:35,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:35,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [789994045] [2021-05-06 11:20:35,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:35,857 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:35,857 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:35,858 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:35,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:36,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:37,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:37,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:20:37,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:37,007 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 11:20:37,007 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:37,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [789994045] [2021-05-06 11:20:37,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [789994045] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:37,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:37,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:20:37,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820301873] [2021-05-06 11:20:37,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:20:37,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:37,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:20:37,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1260, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:20:37,008 INFO L87 Difference]: Start difference. First operand 3646 states and 4479 transitions. Second operand has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:44,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:44,660 INFO L93 Difference]: Finished difference Result 3883 states and 4761 transitions. [2021-05-06 11:20:44,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:20:44,665 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:20:44,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:44,669 INFO L225 Difference]: With dead ends: 3883 [2021-05-06 11:20:44,669 INFO L226 Difference]: Without dead ends: 3881 [2021-05-06 11:20:44,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 2024.4ms TimeCoverageRelationStatistics Valid=534, Invalid=5016, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:20:44,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3881 states. [2021-05-06 11:20:49,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3881 to 3687. [2021-05-06 11:20:49,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3687 states, 3432 states have (on average 1.2092074592074593) internal successors, (4150), 3556 states have internal predecessors, (4150), 190 states have call successors, (190), 65 states have call predecessors, (190), 64 states have return successors, (189), 65 states have call predecessors, (189), 189 states have call successors, (189) [2021-05-06 11:20:49,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3687 states to 3687 states and 4529 transitions. [2021-05-06 11:20:49,068 INFO L78 Accepts]: Start accepts. Automaton has 3687 states and 4529 transitions. Word has length 77 [2021-05-06 11:20:49,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:49,068 INFO L480 AbstractCegarLoop]: Abstraction has 3687 states and 4529 transitions. [2021-05-06 11:20:49,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:49,068 INFO L276 IsEmpty]: Start isEmpty. Operand 3687 states and 4529 transitions. [2021-05-06 11:20:49,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:20:49,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:49,071 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:49,071 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2021-05-06 11:20:49,071 INFO L428 AbstractCegarLoop]: === Iteration 153 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:49,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:49,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1117616943, now seen corresponding path program 30 times [2021-05-06 11:20:49,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:49,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207641563] [2021-05-06 11:20:49,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:49,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:49,075 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:49,075 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:49,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:49,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:49,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:49,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:20:49,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:49,722 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 11:20:49,722 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:49,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207641563] [2021-05-06 11:20:49,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1207641563] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:49,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:49,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:20:49,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575024098] [2021-05-06 11:20:49,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:20:49,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:49,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:20:49,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:20:49,723 INFO L87 Difference]: Start difference. First operand 3687 states and 4529 transitions. Second operand has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:20:57,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:57,410 INFO L93 Difference]: Finished difference Result 3987 states and 4888 transitions. [2021-05-06 11:20:57,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:20:57,410 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:20:57,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:57,415 INFO L225 Difference]: With dead ends: 3987 [2021-05-06 11:20:57,415 INFO L226 Difference]: Without dead ends: 3985 [2021-05-06 11:20:57,415 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1650 ImplicationChecksByTransitivity, 1755.9ms TimeCoverageRelationStatistics Valid=621, Invalid=5231, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:20:57,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3985 states. [2021-05-06 11:21:01,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3985 to 3736. [2021-05-06 11:21:01,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3736 states, 3477 states have (on average 1.2093758987633016) internal successors, (4205), 3605 states have internal predecessors, (4205), 194 states have call successors, (194), 65 states have call predecessors, (194), 64 states have return successors, (193), 65 states have call predecessors, (193), 193 states have call successors, (193) [2021-05-06 11:21:01,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3736 states to 3736 states and 4592 transitions. [2021-05-06 11:21:01,905 INFO L78 Accepts]: Start accepts. Automaton has 3736 states and 4592 transitions. Word has length 77 [2021-05-06 11:21:01,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:01,905 INFO L480 AbstractCegarLoop]: Abstraction has 3736 states and 4592 transitions. [2021-05-06 11:21:01,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:01,906 INFO L276 IsEmpty]: Start isEmpty. Operand 3736 states and 4592 transitions. [2021-05-06 11:21:01,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:21:01,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:01,908 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:01,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 11:21:01,909 INFO L428 AbstractCegarLoop]: === Iteration 154 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:01,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:01,909 INFO L82 PathProgramCache]: Analyzing trace with hash -761766605, now seen corresponding path program 31 times [2021-05-06 11:21:01,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:01,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604449921] [2021-05-06 11:21:01,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:01,912 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:01,912 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:01,913 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:01,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:21:02,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,649 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 11:21:02,650 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604449921] [2021-05-06 11:21:02,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1604449921] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:21:02,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269311442] [2021-05-06 11:21:02,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:21:02,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:21:02,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1043, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:21:02,650 INFO L87 Difference]: Start difference. First operand 3736 states and 4592 transitions. Second operand has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:09,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:09,738 INFO L93 Difference]: Finished difference Result 3892 states and 4777 transitions. [2021-05-06 11:21:09,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:21:09,739 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:21:09,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:09,743 INFO L225 Difference]: With dead ends: 3892 [2021-05-06 11:21:09,743 INFO L226 Difference]: Without dead ends: 3890 [2021-05-06 11:21:09,743 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1237 ImplicationChecksByTransitivity, 1904.2ms TimeCoverageRelationStatistics Valid=640, Invalid=3916, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:21:09,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3890 states. [2021-05-06 11:21:14,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3890 to 3753. [2021-05-06 11:21:14,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3753 states, 3492 states have (on average 1.2093356242840778) internal successors, (4223), 3620 states have internal predecessors, (4223), 194 states have call successors, (194), 67 states have call predecessors, (194), 66 states have return successors, (193), 65 states have call predecessors, (193), 193 states have call successors, (193) [2021-05-06 11:21:14,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3753 states to 3753 states and 4610 transitions. [2021-05-06 11:21:14,163 INFO L78 Accepts]: Start accepts. Automaton has 3753 states and 4610 transitions. Word has length 77 [2021-05-06 11:21:14,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:14,163 INFO L480 AbstractCegarLoop]: Abstraction has 3753 states and 4610 transitions. [2021-05-06 11:21:14,163 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:14,163 INFO L276 IsEmpty]: Start isEmpty. Operand 3753 states and 4610 transitions. [2021-05-06 11:21:14,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:21:14,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:14,166 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 5, 5, 5, 5, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:14,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153 [2021-05-06 11:21:14,166 INFO L428 AbstractCegarLoop]: === Iteration 155 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:14,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:14,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1583804039, now seen corresponding path program 32 times [2021-05-06 11:21:14,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:14,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807841224] [2021-05-06 11:21:14,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:14,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:14,170 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:14,170 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:14,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:15,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:15,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:15,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-06 11:21:15,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:15,242 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 11:21:15,243 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:15,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807841224] [2021-05-06 11:21:15,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [807841224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:15,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:15,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:21:15,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767244346] [2021-05-06 11:21:15,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:21:15,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:15,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:21:15,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1467, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:21:15,244 INFO L87 Difference]: Start difference. First operand 3753 states and 4610 transitions. Second operand has 41 states, 40 states have (on average 1.775) internal successors, (71), 39 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:23,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:23,074 INFO L93 Difference]: Finished difference Result 3946 states and 4840 transitions. [2021-05-06 11:21:23,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:21:23,074 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.775) internal successors, (71), 39 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 77 [2021-05-06 11:21:23,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:23,078 INFO L225 Difference]: With dead ends: 3946 [2021-05-06 11:21:23,078 INFO L226 Difference]: Without dead ends: 3944 [2021-05-06 11:21:23,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1836 ImplicationChecksByTransitivity, 2215.4ms TimeCoverageRelationStatistics Valid=533, Invalid=5473, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:21:23,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3944 states. [2021-05-06 11:21:27,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3944 to 3753. [2021-05-06 11:21:27,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3753 states, 3492 states have (on average 1.2093356242840778) internal successors, (4223), 3620 states have internal predecessors, (4223), 194 states have call successors, (194), 67 states have call predecessors, (194), 66 states have return successors, (193), 65 states have call predecessors, (193), 193 states have call successors, (193) [2021-05-06 11:21:27,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3753 states to 3753 states and 4610 transitions. [2021-05-06 11:21:27,458 INFO L78 Accepts]: Start accepts. Automaton has 3753 states and 4610 transitions. Word has length 77 [2021-05-06 11:21:27,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:27,458 INFO L480 AbstractCegarLoop]: Abstraction has 3753 states and 4610 transitions. [2021-05-06 11:21:27,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.775) internal successors, (71), 39 states have internal predecessors, (71), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:27,458 INFO L276 IsEmpty]: Start isEmpty. Operand 3753 states and 4610 transitions. [2021-05-06 11:21:27,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:21:27,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:27,461 INFO L523 BasicCegarLoop]: trace histogram [5, 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] [2021-05-06 11:21:27,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2021-05-06 11:21:27,461 INFO L428 AbstractCegarLoop]: === Iteration 156 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:27,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:27,461 INFO L82 PathProgramCache]: Analyzing trace with hash -485454068, now seen corresponding path program 8 times [2021-05-06 11:21:27,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:27,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757504374] [2021-05-06 11:21:27,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:27,464 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:27,464 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:27,465 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:27,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:27,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-06 11:21:27,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-06 11:21:27,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-06 11:21:27,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-06 11:21:27,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:27,609 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 11:21:27,609 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:27,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757504374] [2021-05-06 11:21:27,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1757504374] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:27,609 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:27,609 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:21:27,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596851107] [2021-05-06 11:21:27,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:21:27,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:27,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:21:27,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:27,610 INFO L87 Difference]: Start difference. First operand 3753 states and 4610 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:21:32,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:32,929 INFO L93 Difference]: Finished difference Result 3866 states and 4744 transitions. [2021-05-06 11:21:32,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:21:32,930 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 81 [2021-05-06 11:21:32,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:32,933 INFO L225 Difference]: With dead ends: 3866 [2021-05-06 11:21:32,934 INFO L226 Difference]: Without dead ends: 3529 [2021-05-06 11:21:32,934 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 288.1ms TimeCoverageRelationStatistics Valid=105, Invalid=597, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:21:32,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3529 states. [2021-05-06 11:21:36,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3529 to 3158. [2021-05-06 11:21:36,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3158 states, 2994 states have (on average 1.2050768203072812) internal successors, (3608), 3076 states have internal predecessors, (3608), 126 states have call successors, (126), 38 states have call predecessors, (126), 37 states have return successors, (124), 43 states have call predecessors, (124), 124 states have call successors, (124) [2021-05-06 11:21:36,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3158 states to 3158 states and 3858 transitions. [2021-05-06 11:21:36,404 INFO L78 Accepts]: Start accepts. Automaton has 3158 states and 3858 transitions. Word has length 81 [2021-05-06 11:21:36,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:36,404 INFO L480 AbstractCegarLoop]: Abstraction has 3158 states and 3858 transitions. [2021-05-06 11:21:36,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 11:21:36,404 INFO L276 IsEmpty]: Start isEmpty. Operand 3158 states and 3858 transitions. [2021-05-06 11:21:36,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-06 11:21:36,406 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:36,406 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 7, 5, 5, 4, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:36,406 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 11:21:36,406 INFO L428 AbstractCegarLoop]: === Iteration 157 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:36,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:36,407 INFO L82 PathProgramCache]: Analyzing trace with hash 459831845, now seen corresponding path program 33 times [2021-05-06 11:21:36,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:36,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884948222] [2021-05-06 11:21:36,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:36,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:36,410 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:36,411 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:36,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:37,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:37,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:37,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-06 11:21:37,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:37,182 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 11:21:37,182 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:37,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884948222] [2021-05-06 11:21:37,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1884948222] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:37,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:37,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:21:37,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686655243] [2021-05-06 11:21:37,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:21:37,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:37,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:21:37,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:21:37,183 INFO L87 Difference]: Start difference. First operand 3158 states and 3858 transitions. Second operand has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:42,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:42,787 INFO L93 Difference]: Finished difference Result 3236 states and 3950 transitions. [2021-05-06 11:21:42,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:21:42,788 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 78 [2021-05-06 11:21:42,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:42,792 INFO L225 Difference]: With dead ends: 3236 [2021-05-06 11:21:42,792 INFO L226 Difference]: Without dead ends: 3234 [2021-05-06 11:21:42,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1732.7ms TimeCoverageRelationStatistics Valid=708, Invalid=4122, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:21:42,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3234 states. [2021-05-06 11:21:46,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3234 to 3184. [2021-05-06 11:21:46,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3184 states, 3016 states have (on average 1.2045755968169762) internal successors, (3633), 3100 states have internal predecessors, (3633), 129 states have call successors, (129), 39 states have call predecessors, (129), 38 states have return successors, (127), 44 states have call predecessors, (127), 127 states have call successors, (127) [2021-05-06 11:21:46,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3184 states to 3184 states and 3889 transitions. [2021-05-06 11:21:46,393 INFO L78 Accepts]: Start accepts. Automaton has 3184 states and 3889 transitions. Word has length 78 [2021-05-06 11:21:46,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:46,393 INFO L480 AbstractCegarLoop]: Abstraction has 3184 states and 3889 transitions. [2021-05-06 11:21:46,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:21:46,393 INFO L276 IsEmpty]: Start isEmpty. Operand 3184 states and 3889 transitions. [2021-05-06 11:21:46,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:21:46,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:46,396 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:46,396 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable156 [2021-05-06 11:21:46,396 INFO L428 AbstractCegarLoop]: === Iteration 158 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:46,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:46,397 INFO L82 PathProgramCache]: Analyzing trace with hash 718548425, now seen corresponding path program 41 times [2021-05-06 11:21:46,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:46,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412695332] [2021-05-06 11:21:46,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:46,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:46,400 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:46,400 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:46,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:46,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:46,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:46,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:21:46,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:46,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 11:21:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:46,758 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 11:21:46,758 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:46,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412695332] [2021-05-06 11:21:46,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [412695332] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:46,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:46,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:21:46,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645753106] [2021-05-06 11:21:46,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:21:46,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:46,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:21:46,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:21:46,759 INFO L87 Difference]: Start difference. First operand 3184 states and 3889 transitions. Second operand has 23 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:21:54,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:54,189 INFO L93 Difference]: Finished difference Result 3984 states and 4883 transitions. [2021-05-06 11:21:54,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:21:54,189 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 79 [2021-05-06 11:21:54,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:54,194 INFO L225 Difference]: With dead ends: 3984 [2021-05-06 11:21:54,194 INFO L226 Difference]: Without dead ends: 3982 [2021-05-06 11:21:54,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1526 ImplicationChecksByTransitivity, 1140.6ms TimeCoverageRelationStatistics Valid=483, Invalid=5067, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:21:54,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3982 states. [2021-05-06 11:21:58,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3982 to 3303. [2021-05-06 11:21:58,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3303 states, 3119 states have (on average 1.2026290477717216) internal successors, (3751), 3214 states have internal predecessors, (3751), 145 states have call successors, (145), 39 states have call predecessors, (145), 38 states have return successors, (143), 49 states have call predecessors, (143), 143 states have call successors, (143) [2021-05-06 11:21:58,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3303 states to 3303 states and 4039 transitions. [2021-05-06 11:21:58,047 INFO L78 Accepts]: Start accepts. Automaton has 3303 states and 4039 transitions. Word has length 79 [2021-05-06 11:21:58,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:58,047 INFO L480 AbstractCegarLoop]: Abstraction has 3303 states and 4039 transitions. [2021-05-06 11:21:58,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 21 states have (on average 3.142857142857143) internal successors, (66), 21 states have internal predecessors, (66), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:21:58,047 INFO L276 IsEmpty]: Start isEmpty. Operand 3303 states and 4039 transitions. [2021-05-06 11:21:58,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:21:58,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:58,050 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:58,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable157 [2021-05-06 11:21:58,050 INFO L428 AbstractCegarLoop]: === Iteration 159 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:58,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:58,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1987133449, now seen corresponding path program 42 times [2021-05-06 11:21:58,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:58,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314585419] [2021-05-06 11:21:58,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:58,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:58,054 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:58,054 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:58,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:58,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:21:58,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 11:21:58,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:58,554 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 11:21:58,554 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:58,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314585419] [2021-05-06 11:21:58,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [314585419] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:58,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:58,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:21:58,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837069456] [2021-05-06 11:21:58,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:21:58,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:58,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:21:58,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=620, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:21:58,555 INFO L87 Difference]: Start difference. First operand 3303 states and 4039 transitions. Second operand has 27 states, 25 states have (on average 2.72) internal successors, (68), 25 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:22:04,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:04,054 INFO L93 Difference]: Finished difference Result 3415 states and 4161 transitions. [2021-05-06 11:22:04,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:22:04,054 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.72) internal successors, (68), 25 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 79 [2021-05-06 11:22:04,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:04,058 INFO L225 Difference]: With dead ends: 3415 [2021-05-06 11:22:04,058 INFO L226 Difference]: Without dead ends: 3413 [2021-05-06 11:22:04,059 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 8 SyntacticMatches, 6 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 967.1ms TimeCoverageRelationStatistics Valid=291, Invalid=2159, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:22:04,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3413 states. [2021-05-06 11:22:08,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3413 to 3357. [2021-05-06 11:22:08,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3357 states, 3161 states have (on average 1.1999367288832647) internal successors, (3793), 3262 states have internal predecessors, (3793), 155 states have call successors, (155), 41 states have call predecessors, (155), 40 states have return successors, (153), 53 states have call predecessors, (153), 153 states have call successors, (153) [2021-05-06 11:22:08,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3357 states to 3357 states and 4101 transitions. [2021-05-06 11:22:08,138 INFO L78 Accepts]: Start accepts. Automaton has 3357 states and 4101 transitions. Word has length 79 [2021-05-06 11:22:08,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:08,138 INFO L480 AbstractCegarLoop]: Abstraction has 3357 states and 4101 transitions. [2021-05-06 11:22:08,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 25 states have (on average 2.72) internal successors, (68), 25 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:22:08,138 INFO L276 IsEmpty]: Start isEmpty. Operand 3357 states and 4101 transitions. [2021-05-06 11:22:08,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:22:08,141 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:08,141 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:08,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 11:22:08,141 INFO L428 AbstractCegarLoop]: === Iteration 160 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:08,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:08,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1653592637, now seen corresponding path program 43 times [2021-05-06 11:22:08,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:08,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350845014] [2021-05-06 11:22:08,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:08,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:08,145 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:08,145 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:08,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:08,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:08,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:08,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-06 11:22:08,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:08,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-06 11:22:08,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:08,626 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 11:22:08,626 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:08,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350845014] [2021-05-06 11:22:08,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [350845014] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:08,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:08,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:22:08,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116086705] [2021-05-06 11:22:08,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:22:08,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:08,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:22:08,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=564, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:22:08,626 INFO L87 Difference]: Start difference. First operand 3357 states and 4101 transitions. Second operand has 26 states, 25 states have (on average 2.72) internal successors, (68), 24 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:22:14,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:14,122 INFO L93 Difference]: Finished difference Result 3493 states and 4255 transitions. [2021-05-06 11:22:14,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:22:14,122 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.72) internal successors, (68), 24 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 79 [2021-05-06 11:22:14,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:14,126 INFO L225 Difference]: With dead ends: 3493 [2021-05-06 11:22:14,126 INFO L226 Difference]: Without dead ends: 3491 [2021-05-06 11:22:14,127 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 712.8ms TimeCoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:22:14,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3491 states. [2021-05-06 11:22:18,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3491 to 3336. [2021-05-06 11:22:18,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3336 states, 3141 states have (on average 1.1999363260108247) internal successors, (3769), 3241 states have internal predecessors, (3769), 154 states have call successors, (154), 41 states have call predecessors, (154), 40 states have return successors, (152), 53 states have call predecessors, (152), 152 states have call successors, (152) [2021-05-06 11:22:18,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3336 states to 3336 states and 4075 transitions. [2021-05-06 11:22:18,145 INFO L78 Accepts]: Start accepts. Automaton has 3336 states and 4075 transitions. Word has length 79 [2021-05-06 11:22:18,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:18,145 INFO L480 AbstractCegarLoop]: Abstraction has 3336 states and 4075 transitions. [2021-05-06 11:22:18,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 2.72) internal successors, (68), 24 states have internal predecessors, (68), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:22:18,145 INFO L276 IsEmpty]: Start isEmpty. Operand 3336 states and 4075 transitions. [2021-05-06 11:22:18,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:22:18,148 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:18,148 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:18,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2021-05-06 11:22:18,148 INFO L428 AbstractCegarLoop]: === Iteration 161 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:18,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:18,149 INFO L82 PathProgramCache]: Analyzing trace with hash 606134342, now seen corresponding path program 41 times [2021-05-06 11:22:18,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:18,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259760901] [2021-05-06 11:22:18,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:18,152 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:18,152 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:18,153 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:18,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:19,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:19,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:19,323 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 11:22:19,323 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:19,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259760901] [2021-05-06 11:22:19,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1259760901] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:19,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:19,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:22:19,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625635445] [2021-05-06 11:22:19,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:22:19,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:19,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:22:19,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:22:19,324 INFO L87 Difference]: Start difference. First operand 3336 states and 4075 transitions. Second operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 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 11:22:29,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:29,304 INFO L93 Difference]: Finished difference Result 4539 states and 5565 transitions. [2021-05-06 11:22:29,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:22:29,304 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 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 77 [2021-05-06 11:22:29,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:29,309 INFO L225 Difference]: With dead ends: 4539 [2021-05-06 11:22:29,310 INFO L226 Difference]: Without dead ends: 4537 [2021-05-06 11:22:29,310 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 7 SyntacticMatches, 8 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1591 ImplicationChecksByTransitivity, 2054.3ms TimeCoverageRelationStatistics Valid=468, Invalid=5082, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:22:29,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4537 states.