/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/loop-invgen/up.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:32:19,455 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:32:19,457 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:32:19,492 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:32:19,548 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:32:19,549 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:32:19,550 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:32:19,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:32:19,564 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:32:19,565 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:32:19,568 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:32:19,568 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:32:19,568 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:32:19,568 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:32:19,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:32:19,569 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:32:19,569 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:32:19,569 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:32:19,570 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:32:19,570 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:32:19,570 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:32:19,570 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:32:19,570 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:32:19,571 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:32:19,571 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:32:19,571 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:32:19,873 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:32:19,895 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:32:19,897 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:32:19,898 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:32:19,914 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:32:19,915 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/up.i [2021-05-02 23:32:19,990 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70b23f520/04096be2a5bc4a3b8dcb35c4388ac869/FLAGd26fb1ebd [2021-05-02 23:32:20,374 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:32:20,374 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i [2021-05-02 23:32:20,379 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70b23f520/04096be2a5bc4a3b8dcb35c4388ac869/FLAGd26fb1ebd [2021-05-02 23:32:20,392 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70b23f520/04096be2a5bc4a3b8dcb35c4388ac869 [2021-05-02 23:32:20,394 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:32:20,395 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:32:20,399 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:32:20,399 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:32:20,402 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:32:20,402 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,403 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c459508 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20, skipping insertion in model container [2021-05-02 23:32:20,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,407 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:32:20,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:32:20,527 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i[893,906] [2021-05-02 23:32:20,536 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:32:20,541 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:32:20,579 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i[893,906] [2021-05-02 23:32:20,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:32:20,615 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:32:20,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20 WrapperNode [2021-05-02 23:32:20,624 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:32:20,625 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:32:20,625 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:32:20,626 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:32:20,632 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,633 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,638 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,646 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,649 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,653 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (1/1) ... [2021-05-02 23:32:20,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:32:20,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:32:20,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:32:20,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:32:20,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (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 [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:32:20,719 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:32:20,719 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:32:20,720 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:32:20,721 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:32:20,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:32:20,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:32:20,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:32:20,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:32:20,722 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:32:20,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:32:20,890 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:32:20,890 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 23:32:20,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:32:20 BoogieIcfgContainer [2021-05-02 23:32:20,891 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:32:20,892 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:32:20,892 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:32:20,894 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:32:20,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:32:20" (1/3) ... [2021-05-02 23:32:20,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c4cd7be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:32:20, skipping insertion in model container [2021-05-02 23:32:20,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:32:20" (2/3) ... [2021-05-02 23:32:20,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c4cd7be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:32:20, skipping insertion in model container [2021-05-02 23:32:20,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:32:20" (3/3) ... [2021-05-02 23:32:20,896 INFO L111 eAbstractionObserver]: Analyzing ICFG up.i [2021-05-02 23:32:20,899 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:32:20,901 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:32:20,911 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:32:20,922 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:32:20,922 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:32:20,922 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:32:20,922 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:32:20,923 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:32:20,923 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:32:20,923 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:32:20,923 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:32:20,931 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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) [2021-05-02 23:32:20,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 23:32:20,934 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:20,935 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:20,935 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:20,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:20,938 INFO L82 PathProgramCache]: Analyzing trace with hash 661364838, now seen corresponding path program 1 times [2021-05-02 23:32:20,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:20,943 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917917797] [2021-05-02 23:32:20,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:20,980 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:32:21,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:21,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:21,112 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:21,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917917797] [2021-05-02 23:32:21,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1917917797] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:21,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:21,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:32:21,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483694659] [2021-05-02 23:32:21,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:32:21,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:21,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:32:21,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:32:21,125 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:21,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:21,337 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2021-05-02 23:32:21,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 23:32:21,338 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 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 13 [2021-05-02 23:32:21,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:21,343 INFO L225 Difference]: With dead ends: 40 [2021-05-02 23:32:21,343 INFO L226 Difference]: Without dead ends: 18 [2021-05-02 23:32:21,345 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 142.9ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:32:21,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-02 23:32:21,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-02 23:32:21,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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) [2021-05-02 23:32:21,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-05-02 23:32:21,374 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-05-02 23:32:21,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:21,374 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-05-02 23:32:21,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:21,374 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-05-02 23:32:21,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 23:32:21,375 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:21,375 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:21,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:32:21,376 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:21,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:21,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1204460846, now seen corresponding path program 1 times [2021-05-02 23:32:21,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:21,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346233943] [2021-05-02 23:32:21,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:21,413 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_6 v_main_~n~0_8) InVars {main_~i~0=v_main_~i~0_6, main_~n~0=v_main_~n~0_8} OutVars{main_~i~0=v_main_~i~0_6, main_~n~0=v_main_~n~0_8} AuxVars[] AssignedVars[] [2021-05-02 23:32:21,435 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:21,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:21,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:21,506 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:21,550 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:21,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:21,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:21,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:21,774 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:21,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346233943] [2021-05-02 23:32:21,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [346233943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:21,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:21,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:32:21,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022976492] [2021-05-02 23:32:21,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:32:21,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:21,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:32:21,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:32:21,776 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:22,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:22,102 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 23:32:22,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:32:22,102 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 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 14 [2021-05-02 23:32:22,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:22,104 INFO L225 Difference]: With dead ends: 32 [2021-05-02 23:32:22,104 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 23:32:22,105 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 378.0ms TimeCoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:32:22,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 23:32:22,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-05-02 23:32:22,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 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) [2021-05-02 23:32:22,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 23:32:22,112 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 14 [2021-05-02 23:32:22,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:22,112 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 23:32:22,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:32:22,112 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 23:32:22,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 23:32:22,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:22,113 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:22,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:32:22,113 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:22,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:22,113 INFO L82 PathProgramCache]: Analyzing trace with hash -801413244, now seen corresponding path program 1 times [2021-05-02 23:32:22,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:22,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089921453] [2021-05-02 23:32:22,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:22,118 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_10 v_main_~n~0_9) InVars {main_~i~0=v_main_~i~0_10, main_~n~0=v_main_~n~0_9} OutVars{main_~i~0=v_main_~i~0_10, main_~n~0=v_main_~n~0_9} AuxVars[] AssignedVars[] [2021-05-02 23:32:22,121 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:22,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:22,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:22,151 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:22,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:22,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:22,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:22,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:22,417 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:22,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089921453] [2021-05-02 23:32:22,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2089921453] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:22,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:22,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-02 23:32:22,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226400307] [2021-05-02 23:32:22,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:32:22,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:22,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:32:22,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:32:22,419 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 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) [2021-05-02 23:32:22,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:22,773 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-05-02 23:32:22,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:32:22,774 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 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 21 [2021-05-02 23:32:22,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:22,775 INFO L225 Difference]: With dead ends: 39 [2021-05-02 23:32:22,775 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 23:32:22,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 399.0ms TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:32:22,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 23:32:22,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 23:32:22,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 18 states have internal predecessors, (19), 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) [2021-05-02 23:32:22,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-05-02 23:32:22,780 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2021-05-02 23:32:22,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:22,780 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-05-02 23:32:22,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 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) [2021-05-02 23:32:22,780 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-05-02 23:32:22,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:32:22,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:22,780 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:22,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:32:22,781 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:22,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:22,781 INFO L82 PathProgramCache]: Analyzing trace with hash -447407028, now seen corresponding path program 2 times [2021-05-02 23:32:22,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:22,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869415474] [2021-05-02 23:32:22,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:22,786 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_14 v_main_~n~0_10) InVars {main_~i~0=v_main_~i~0_14, main_~n~0=v_main_~n~0_10} OutVars{main_~i~0=v_main_~i~0_14, main_~n~0=v_main_~n~0_10} AuxVars[] AssignedVars[] [2021-05-02 23:32:22,789 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:22,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:22,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:22,826 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:22,840 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:22,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:22,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:22,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:22,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:23,064 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:23,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869415474] [2021-05-02 23:32:23,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1869415474] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:23,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:23,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:32:23,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256736961] [2021-05-02 23:32:23,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:32:23,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:23,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:32:23,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:32:23,066 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 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) [2021-05-02 23:32:23,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:23,511 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 23:32:23,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:32:23,511 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 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 22 [2021-05-02 23:32:23,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:23,512 INFO L225 Difference]: With dead ends: 41 [2021-05-02 23:32:23,512 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 23:32:23,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 408.4ms TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:32:23,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 23:32:23,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 23:32:23,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 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) [2021-05-02 23:32:23,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-05-02 23:32:23,518 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2021-05-02 23:32:23,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:23,519 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-05-02 23:32:23,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 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) [2021-05-02 23:32:23,519 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-05-02 23:32:23,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 23:32:23,519 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:23,520 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:23,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:32:23,520 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:23,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:23,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1936851076, now seen corresponding path program 3 times [2021-05-02 23:32:23,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:23,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673708514] [2021-05-02 23:32:23,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:23,525 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_19 v_main_~n~0_11) InVars {main_~i~0=v_main_~i~0_19, main_~n~0=v_main_~n~0_11} OutVars{main_~i~0=v_main_~i~0_19, main_~n~0=v_main_~n~0_11} AuxVars[] AssignedVars[] [2021-05-02 23:32:23,528 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:23,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:23,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:23,558 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:23,573 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:23,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:23,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:23,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:23,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:23,793 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:23,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673708514] [2021-05-02 23:32:23,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1673708514] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:23,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:23,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-02 23:32:23,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544241238] [2021-05-02 23:32:23,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 23:32:23,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:23,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 23:32:23,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:32:23,795 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 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) [2021-05-02 23:32:24,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:24,259 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2021-05-02 23:32:24,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:32:24,260 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 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 23 [2021-05-02 23:32:24,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:24,260 INFO L225 Difference]: With dead ends: 42 [2021-05-02 23:32:24,260 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 23:32:24,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 430.6ms TimeCoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:32:24,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 23:32:24,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 23:32:24,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.105263157894737) internal successors, (21), 20 states have internal predecessors, (21), 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) [2021-05-02 23:32:24,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 23:32:24,266 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 23:32:24,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:24,266 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 23:32:24,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 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) [2021-05-02 23:32:24,266 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 23:32:24,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 23:32:24,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:24,267 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:24,267 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:32:24,267 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:24,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:24,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1460559028, now seen corresponding path program 4 times [2021-05-02 23:32:24,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:24,268 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698717089] [2021-05-02 23:32:24,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:24,272 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_25 v_main_~n~0_12) InVars {main_~i~0=v_main_~i~0_25, main_~n~0=v_main_~n~0_12} OutVars{main_~i~0=v_main_~i~0_25, main_~n~0=v_main_~n~0_12} AuxVars[] AssignedVars[] [2021-05-02 23:32:24,275 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:24,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:24,282 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:24,303 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:24,314 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:24,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:24,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:24,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:24,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:24,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:24,515 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:24,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698717089] [2021-05-02 23:32:24,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1698717089] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:24,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:24,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-02 23:32:24,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349232122] [2021-05-02 23:32:24,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 23:32:24,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:24,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 23:32:24,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:32:24,517 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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) [2021-05-02 23:32:24,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:24,961 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2021-05-02 23:32:24,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:32:24,962 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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 24 [2021-05-02 23:32:24,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:24,962 INFO L225 Difference]: With dead ends: 43 [2021-05-02 23:32:24,962 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 23:32:24,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 417.3ms TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:32:24,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 23:32:24,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 23:32:24,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.1) internal successors, (22), 21 states have internal predecessors, (22), 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) [2021-05-02 23:32:24,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-05-02 23:32:24,968 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2021-05-02 23:32:24,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:24,969 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-05-02 23:32:24,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 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) [2021-05-02 23:32:24,969 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-05-02 23:32:24,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:32:24,969 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:24,969 INFO L523 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:24,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:32:24,970 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:24,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:24,970 INFO L82 PathProgramCache]: Analyzing trace with hash 593910148, now seen corresponding path program 5 times [2021-05-02 23:32:24,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:24,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847365705] [2021-05-02 23:32:24,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:24,975 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_32 v_main_~n~0_13) InVars {main_~i~0=v_main_~i~0_32, main_~n~0=v_main_~n~0_13} OutVars{main_~i~0=v_main_~i~0_32, main_~n~0=v_main_~n~0_13} AuxVars[] AssignedVars[] [2021-05-02 23:32:24,977 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:24,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:24,994 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:25,004 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:25,015 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:25,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:25,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:25,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:25,250 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:25,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847365705] [2021-05-02 23:32:25,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [847365705] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:25,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:25,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-02 23:32:25,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854640716] [2021-05-02 23:32:25,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 23:32:25,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:25,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 23:32:25,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:32:25,251 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-05-02 23:32:25,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:25,679 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 23:32:25,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 23:32:25,679 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 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 25 [2021-05-02 23:32:25,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:25,681 INFO L225 Difference]: With dead ends: 44 [2021-05-02 23:32:25,681 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 23:32:25,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 443.6ms TimeCoverageRelationStatistics Valid=142, Invalid=788, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:32:25,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 23:32:25,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 23:32:25,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 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) [2021-05-02 23:32:25,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-05-02 23:32:25,697 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2021-05-02 23:32:25,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:25,699 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-05-02 23:32:25,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 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) [2021-05-02 23:32:25,699 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-05-02 23:32:25,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 23:32:25,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:25,700 INFO L523 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:25,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:32:25,701 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:25,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:25,701 INFO L82 PathProgramCache]: Analyzing trace with hash -142054836, now seen corresponding path program 6 times [2021-05-02 23:32:25,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:25,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019704930] [2021-05-02 23:32:25,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:25,714 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_40 v_main_~n~0_14) InVars {main_~i~0=v_main_~i~0_40, main_~n~0=v_main_~n~0_14} OutVars{main_~i~0=v_main_~i~0_40, main_~n~0=v_main_~n~0_14} AuxVars[] AssignedVars[] [2021-05-02 23:32:25,723 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:25,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:25,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:25,757 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:25,770 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:25,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:25,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:25,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:25,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:26,005 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:26,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019704930] [2021-05-02 23:32:26,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2019704930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:26,005 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:26,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:32:26,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60598435] [2021-05-02 23:32:26,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:32:26,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:26,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:32:26,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:32:26,007 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 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) [2021-05-02 23:32:26,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:26,485 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-05-02 23:32:26,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 23:32:26,485 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 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 26 [2021-05-02 23:32:26,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:26,486 INFO L225 Difference]: With dead ends: 45 [2021-05-02 23:32:26,486 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 23:32:26,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 460.5ms TimeCoverageRelationStatistics Valid=153, Invalid=903, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:32:26,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 23:32:26,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-02 23:32:26,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 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) [2021-05-02 23:32:26,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 23:32:26,491 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-05-02 23:32:26,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:26,491 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 23:32:26,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 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) [2021-05-02 23:32:26,491 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 23:32:26,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 23:32:26,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:26,492 INFO L523 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:26,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:32:26,492 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:26,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:26,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1482132860, now seen corresponding path program 7 times [2021-05-02 23:32:26,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:26,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622347913] [2021-05-02 23:32:26,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:26,499 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_49 v_main_~n~0_15) InVars {main_~i~0=v_main_~i~0_49, main_~n~0=v_main_~n~0_15} OutVars{main_~i~0=v_main_~i~0_49, main_~n~0=v_main_~n~0_15} AuxVars[] AssignedVars[] [2021-05-02 23:32:26,501 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:26,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:26,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:26,530 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:26,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:26,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:26,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:26,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:26,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:26,790 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:26,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622347913] [2021-05-02 23:32:26,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1622347913] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:26,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:26,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-02 23:32:26,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564292144] [2021-05-02 23:32:26,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 23:32:26,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:26,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 23:32:26,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:32:26,791 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 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) [2021-05-02 23:32:27,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:27,282 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2021-05-02 23:32:27,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:32:27,283 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 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 27 [2021-05-02 23:32:27,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:27,283 INFO L225 Difference]: With dead ends: 46 [2021-05-02 23:32:27,284 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 23:32:27,284 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 512.3ms TimeCoverageRelationStatistics Valid=164, Invalid=1026, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:32:27,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 23:32:27,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 23:32:27,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 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) [2021-05-02 23:32:27,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 23:32:27,289 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2021-05-02 23:32:27,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:27,289 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 23:32:27,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.3125) internal successors, (21), 15 states have internal predecessors, (21), 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) [2021-05-02 23:32:27,289 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 23:32:27,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:32:27,289 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:27,290 INFO L523 BasicCegarLoop]: trace histogram [8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:27,290 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:32:27,290 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:27,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:27,290 INFO L82 PathProgramCache]: Analyzing trace with hash -74878644, now seen corresponding path program 8 times [2021-05-02 23:32:27,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:27,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602369032] [2021-05-02 23:32:27,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:27,295 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_59 v_main_~n~0_16) InVars {main_~i~0=v_main_~i~0_59, main_~n~0=v_main_~n~0_16} OutVars{main_~i~0=v_main_~i~0_59, main_~n~0=v_main_~n~0_16} AuxVars[] AssignedVars[] [2021-05-02 23:32:27,298 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:27,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:27,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:27,323 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:27,336 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:27,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:27,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:27,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:27,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:27,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:27,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:27,601 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:27,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602369032] [2021-05-02 23:32:27,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [602369032] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:27,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:27,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:32:27,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537753356] [2021-05-02 23:32:27,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:32:27,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:27,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:32:27,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:32:27,603 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-05-02 23:32:28,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:28,304 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-02 23:32:28,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 23:32:28,305 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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 28 [2021-05-02 23:32:28,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:28,306 INFO L225 Difference]: With dead ends: 47 [2021-05-02 23:32:28,306 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 23:32:28,306 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 655.7ms TimeCoverageRelationStatistics Valid=161, Invalid=1171, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:32:28,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 23:32:28,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 23:32:28,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 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) [2021-05-02 23:32:28,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-05-02 23:32:28,311 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2021-05-02 23:32:28,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:28,311 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-05-02 23:32:28,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 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) [2021-05-02 23:32:28,311 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-05-02 23:32:28,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 23:32:28,312 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:28,312 INFO L523 BasicCegarLoop]: trace histogram [9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:28,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:32:28,312 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:28,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:28,312 INFO L82 PathProgramCache]: Analyzing trace with hash 600329092, now seen corresponding path program 9 times [2021-05-02 23:32:28,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:28,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745433537] [2021-05-02 23:32:28,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:28,316 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_70 v_main_~n~0_17) InVars {main_~i~0=v_main_~i~0_70, main_~n~0=v_main_~n~0_17} OutVars{main_~i~0=v_main_~i~0_70, main_~n~0=v_main_~n~0_17} AuxVars[] AssignedVars[] [2021-05-02 23:32:28,318 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:28,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:28,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:28,346 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:28,360 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:28,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:28,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:28,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:28,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:28,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:28,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:28,727 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:28,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745433537] [2021-05-02 23:32:28,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1745433537] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:28,737 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:28,737 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:32:28,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730682376] [2021-05-02 23:32:28,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:32:28,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:28,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:32:28,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:32:28,738 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 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) [2021-05-02 23:32:29,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:29,563 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2021-05-02 23:32:29,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 23:32:29,563 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 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 29 [2021-05-02 23:32:29,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:29,564 INFO L225 Difference]: With dead ends: 48 [2021-05-02 23:32:29,565 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 23:32:29,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 897.3ms TimeCoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:32:29,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 23:32:29,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 23:32:29,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.08) internal successors, (27), 26 states have internal predecessors, (27), 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) [2021-05-02 23:32:29,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 23:32:29,571 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2021-05-02 23:32:29,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:29,573 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 23:32:29,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 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) [2021-05-02 23:32:29,573 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 23:32:29,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 23:32:29,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:29,577 INFO L523 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:29,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:32:29,577 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:29,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:29,578 INFO L82 PathProgramCache]: Analyzing trace with hash 56932428, now seen corresponding path program 10 times [2021-05-02 23:32:29,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:29,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722409232] [2021-05-02 23:32:29,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:29,584 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_82 v_main_~n~0_18) InVars {main_~i~0=v_main_~i~0_82, main_~n~0=v_main_~n~0_18} OutVars{main_~i~0=v_main_~i~0_82, main_~n~0=v_main_~n~0_18} AuxVars[] AssignedVars[] [2021-05-02 23:32:29,586 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:29,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:29,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:29,615 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:29,641 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:29,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:29,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:29,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:29,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:29,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:30,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:30,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722409232] [2021-05-02 23:32:30,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1722409232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:30,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:30,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-02 23:32:30,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79050603] [2021-05-02 23:32:30,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 23:32:30,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:30,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 23:32:30,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-05-02 23:32:30,022 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 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) [2021-05-02 23:32:30,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:30,768 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-05-02 23:32:30,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:32:30,769 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 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 30 [2021-05-02 23:32:30,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:30,769 INFO L225 Difference]: With dead ends: 49 [2021-05-02 23:32:30,770 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 23:32:30,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 833.8ms TimeCoverageRelationStatistics Valid=197, Invalid=1443, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:32:30,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 23:32:30,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 23:32:30,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 27 states have internal predecessors, (28), 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) [2021-05-02 23:32:30,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-05-02 23:32:30,774 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2021-05-02 23:32:30,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:30,774 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-05-02 23:32:30,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 18 states have internal predecessors, (24), 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) [2021-05-02 23:32:30,774 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-05-02 23:32:30,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:32:30,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:30,774 INFO L523 BasicCegarLoop]: trace histogram [11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:30,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:32:30,775 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:30,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:30,775 INFO L82 PathProgramCache]: Analyzing trace with hash 391505028, now seen corresponding path program 11 times [2021-05-02 23:32:30,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:30,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203886478] [2021-05-02 23:32:30,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:30,778 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_95 v_main_~n~0_19) InVars {main_~i~0=v_main_~i~0_95, main_~n~0=v_main_~n~0_19} OutVars{main_~i~0=v_main_~i~0_95, main_~n~0=v_main_~n~0_19} AuxVars[] AssignedVars[] [2021-05-02 23:32:30,780 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:30,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:30,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:30,803 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:30,816 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:30,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:30,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:30,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:30,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:30,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:31,144 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:31,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203886478] [2021-05-02 23:32:31,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [203886478] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:31,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:31,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:32:31,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698531898] [2021-05-02 23:32:31,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:32:31,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:31,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:32:31,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2021-05-02 23:32:31,145 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 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) [2021-05-02 23:32:31,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:31,904 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2021-05-02 23:32:31,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 23:32:31,905 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 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 31 [2021-05-02 23:32:31,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:31,905 INFO L225 Difference]: With dead ends: 50 [2021-05-02 23:32:31,905 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 23:32:31,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 828.7ms TimeCoverageRelationStatistics Valid=188, Invalid=1618, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:32:31,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 23:32:31,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 23:32:31,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 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) [2021-05-02 23:32:31,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 23:32:31,909 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2021-05-02 23:32:31,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:31,909 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 23:32:31,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.25) internal successors, (25), 19 states have internal predecessors, (25), 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) [2021-05-02 23:32:31,910 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 23:32:31,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 23:32:31,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:31,910 INFO L523 BasicCegarLoop]: trace histogram [12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:31,910 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:32:31,910 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:31,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:31,910 INFO L82 PathProgramCache]: Analyzing trace with hash -2121646260, now seen corresponding path program 12 times [2021-05-02 23:32:31,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:31,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1878181196] [2021-05-02 23:32:31,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:31,914 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_109 v_main_~n~0_20) InVars {main_~i~0=v_main_~i~0_109, main_~n~0=v_main_~n~0_20} OutVars{main_~i~0=v_main_~i~0_109, main_~n~0=v_main_~n~0_20} AuxVars[] AssignedVars[] [2021-05-02 23:32:31,926 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:31,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:31,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:31,952 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:31,966 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:31,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:32,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:32,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:32,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:32,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:32,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:32,321 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:32,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1878181196] [2021-05-02 23:32:32,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1878181196] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:32,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:32,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-02 23:32:32,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459638622] [2021-05-02 23:32:32,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 23:32:32,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:32,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 23:32:32,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:32:32,322 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 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) [2021-05-02 23:32:33,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:33,142 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-05-02 23:32:33,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 23:32:33,142 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 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 32 [2021-05-02 23:32:33,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:33,143 INFO L225 Difference]: With dead ends: 51 [2021-05-02 23:32:33,143 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 23:32:33,143 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 886.6ms TimeCoverageRelationStatistics Valid=219, Invalid=1761, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:32:33,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 23:32:33,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 23:32:33,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 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) [2021-05-02 23:32:33,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 23:32:33,149 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2021-05-02 23:32:33,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:33,149 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 23:32:33,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 20 states have internal predecessors, (26), 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) [2021-05-02 23:32:33,150 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 23:32:33,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:32:33,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:33,150 INFO L523 BasicCegarLoop]: trace histogram [13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:33,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:32:33,150 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:33,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:33,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1575042436, now seen corresponding path program 13 times [2021-05-02 23:32:33,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:33,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636046625] [2021-05-02 23:32:33,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:33,154 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_124 v_main_~n~0_21) InVars {main_~i~0=v_main_~i~0_124, main_~n~0=v_main_~n~0_21} OutVars{main_~i~0=v_main_~i~0_124, main_~n~0=v_main_~n~0_21} AuxVars[] AssignedVars[] [2021-05-02 23:32:33,155 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:33,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:33,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:33,180 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:33,193 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:33,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:33,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:33,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:33,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:33,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:33,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:33,577 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:33,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636046625] [2021-05-02 23:32:33,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [636046625] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:33,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:33,577 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-02 23:32:33,577 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373109348] [2021-05-02 23:32:33,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 23:32:33,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:33,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 23:32:33,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:32:33,578 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 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) [2021-05-02 23:32:34,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:34,441 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2021-05-02 23:32:34,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 23:32:34,442 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 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 [2021-05-02 23:32:34,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:34,442 INFO L225 Difference]: With dead ends: 52 [2021-05-02 23:32:34,442 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 23:32:34,443 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 962.9ms TimeCoverageRelationStatistics Valid=230, Invalid=1932, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:32:34,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 23:32:34,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 23:32:34,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 30 states have internal predecessors, (31), 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) [2021-05-02 23:32:34,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-05-02 23:32:34,446 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2021-05-02 23:32:34,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:34,447 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-05-02 23:32:34,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 21 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) [2021-05-02 23:32:34,447 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-05-02 23:32:34,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:32:34,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:34,447 INFO L523 BasicCegarLoop]: trace histogram [14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:34,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:32:34,447 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:34,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:34,448 INFO L82 PathProgramCache]: Analyzing trace with hash 208275020, now seen corresponding path program 14 times [2021-05-02 23:32:34,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:34,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381189150] [2021-05-02 23:32:34,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:34,451 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_140 v_main_~n~0_22) InVars {main_~i~0=v_main_~i~0_140, main_~n~0=v_main_~n~0_22} OutVars{main_~i~0=v_main_~i~0_140, main_~n~0=v_main_~n~0_22} AuxVars[] AssignedVars[] [2021-05-02 23:32:34,452 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:34,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:34,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:34,475 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:34,488 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:34,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:34,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:34,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:34,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:34,890 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:34,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381189150] [2021-05-02 23:32:34,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1381189150] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:34,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:34,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-02 23:32:34,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807964804] [2021-05-02 23:32:34,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 23:32:34,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:34,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 23:32:34,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=581, Unknown=0, NotChecked=0, Total=650 [2021-05-02 23:32:34,893 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 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) [2021-05-02 23:32:35,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:35,891 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 23:32:35,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 23:32:35,892 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 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 34 [2021-05-02 23:32:35,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:35,893 INFO L225 Difference]: With dead ends: 53 [2021-05-02 23:32:35,893 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 23:32:35,894 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 1027.8ms TimeCoverageRelationStatistics Valid=215, Invalid=2137, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:32:35,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 23:32:35,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-02 23:32:35,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 31 states have internal predecessors, (32), 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) [2021-05-02 23:32:35,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-05-02 23:32:35,904 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 34 [2021-05-02 23:32:35,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:35,904 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-05-02 23:32:35,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 22 states have internal predecessors, (28), 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) [2021-05-02 23:32:35,904 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-05-02 23:32:35,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 23:32:35,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:35,905 INFO L523 BasicCegarLoop]: trace histogram [15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:35,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:32:35,905 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:35,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:35,905 INFO L82 PathProgramCache]: Analyzing trace with hash 788158084, now seen corresponding path program 15 times [2021-05-02 23:32:35,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:35,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960519080] [2021-05-02 23:32:35,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:35,913 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_157 v_main_~n~0_23) InVars {main_~i~0=v_main_~i~0_157, main_~n~0=v_main_~n~0_23} OutVars{main_~i~0=v_main_~i~0_157, main_~n~0=v_main_~n~0_23} AuxVars[] AssignedVars[] [2021-05-02 23:32:35,915 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:35,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:35,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:35,948 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:35,962 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:35,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:36,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:36,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:36,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:36,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:36,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:36,462 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:36,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960519080] [2021-05-02 23:32:36,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [960519080] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:36,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:36,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-02 23:32:36,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781637843] [2021-05-02 23:32:36,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 23:32:36,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:36,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 23:32:36,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:32:36,464 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 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) [2021-05-02 23:32:37,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:37,349 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-05-02 23:32:37,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 23:32:37,350 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 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 35 [2021-05-02 23:32:37,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:37,350 INFO L225 Difference]: With dead ends: 54 [2021-05-02 23:32:37,350 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 23:32:37,351 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1009.6ms TimeCoverageRelationStatistics Valid=252, Invalid=2298, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:32:37,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 23:32:37,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 23:32:37,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.064516129032258) internal successors, (33), 32 states have internal predecessors, (33), 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) [2021-05-02 23:32:37,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 23:32:37,367 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2021-05-02 23:32:37,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:37,367 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 23:32:37,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 23 states have internal predecessors, (29), 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) [2021-05-02 23:32:37,367 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 23:32:37,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 23:32:37,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:37,368 INFO L523 BasicCegarLoop]: trace histogram [16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:37,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:32:37,368 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:37,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:37,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1584663884, now seen corresponding path program 16 times [2021-05-02 23:32:37,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:37,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202547051] [2021-05-02 23:32:37,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:37,384 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_175 v_main_~n~0_24) InVars {main_~i~0=v_main_~i~0_175, main_~n~0=v_main_~n~0_24} OutVars{main_~i~0=v_main_~i~0_175, main_~n~0=v_main_~n~0_24} AuxVars[] AssignedVars[] [2021-05-02 23:32:37,388 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:37,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:37,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:37,416 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:37,434 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:37,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:37,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:37,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:37,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:37,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:37,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:37,937 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:37,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202547051] [2021-05-02 23:32:37,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [202547051] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:37,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:37,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-02 23:32:37,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181088218] [2021-05-02 23:32:37,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 23:32:37,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:37,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 23:32:37,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-05-02 23:32:37,942 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 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) [2021-05-02 23:32:39,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:39,027 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2021-05-02 23:32:39,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 23:32:39,028 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 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 36 [2021-05-02 23:32:39,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:39,028 INFO L225 Difference]: With dead ends: 55 [2021-05-02 23:32:39,028 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 23:32:39,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 1106.2ms TimeCoverageRelationStatistics Valid=263, Invalid=2493, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:32:39,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 23:32:39,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 23:32:39,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 32 states have (on average 1.0625) internal successors, (34), 33 states have internal predecessors, (34), 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) [2021-05-02 23:32:39,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-05-02 23:32:39,032 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2021-05-02 23:32:39,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:39,033 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-05-02 23:32:39,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 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) [2021-05-02 23:32:39,033 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-05-02 23:32:39,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:32:39,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:39,033 INFO L523 BasicCegarLoop]: trace histogram [17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:39,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:32:39,033 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:39,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:39,034 INFO L82 PathProgramCache]: Analyzing trace with hash 506539908, now seen corresponding path program 17 times [2021-05-02 23:32:39,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:39,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077094404] [2021-05-02 23:32:39,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:39,037 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_194 v_main_~n~0_25) InVars {main_~i~0=v_main_~i~0_194, main_~n~0=v_main_~n~0_25} OutVars{main_~i~0=v_main_~i~0_194, main_~n~0=v_main_~n~0_25} AuxVars[] AssignedVars[] [2021-05-02 23:32:39,038 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:39,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:39,043 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:39,061 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:39,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:39,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:39,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:39,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:39,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:39,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:39,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:39,590 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:39,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077094404] [2021-05-02 23:32:39,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1077094404] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:39,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:39,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-02 23:32:39,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271347501] [2021-05-02 23:32:39,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 23:32:39,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:39,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 23:32:39,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-05-02 23:32:39,591 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 27 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-05-02 23:32:40,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:40,677 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2021-05-02 23:32:40,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 23:32:40,678 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 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 37 [2021-05-02 23:32:40,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:40,678 INFO L225 Difference]: With dead ends: 56 [2021-05-02 23:32:40,678 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 23:32:40,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1207.5ms TimeCoverageRelationStatistics Valid=274, Invalid=2696, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:32:40,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 23:32:40,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 23:32:40,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 34 states have internal predecessors, (35), 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) [2021-05-02 23:32:40,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-05-02 23:32:40,683 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 37 [2021-05-02 23:32:40,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:40,683 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-05-02 23:32:40,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 25 states have internal predecessors, (31), 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) [2021-05-02 23:32:40,683 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-05-02 23:32:40,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 23:32:40,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:40,683 INFO L523 BasicCegarLoop]: trace histogram [18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:40,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:32:40,684 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:40,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:40,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1444435020, now seen corresponding path program 18 times [2021-05-02 23:32:40,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:40,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990731996] [2021-05-02 23:32:40,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:40,687 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_214 v_main_~n~0_26) InVars {main_~i~0=v_main_~i~0_214, main_~n~0=v_main_~n~0_26} OutVars{main_~i~0=v_main_~i~0_214, main_~n~0=v_main_~n~0_26} AuxVars[] AssignedVars[] [2021-05-02 23:32:40,688 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:40,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:40,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:40,713 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:40,727 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:40,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:40,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:40,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:40,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:40,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:40,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:41,259 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:41,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990731996] [2021-05-02 23:32:41,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1990731996] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:41,259 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:41,259 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-02 23:32:41,259 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137568600] [2021-05-02 23:32:41,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 23:32:41,259 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:41,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 23:32:41,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=773, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:32:41,260 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 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) [2021-05-02 23:32:42,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:42,099 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2021-05-02 23:32:42,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 23:32:42,100 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 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 38 [2021-05-02 23:32:42,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:42,100 INFO L225 Difference]: With dead ends: 57 [2021-05-02 23:32:42,100 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 23:32:42,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 1068.8ms TimeCoverageRelationStatistics Valid=285, Invalid=2907, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:32:42,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 23:32:42,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 23:32:42,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 35 states have internal predecessors, (36), 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) [2021-05-02 23:32:42,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-05-02 23:32:42,105 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 38 [2021-05-02 23:32:42,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:42,105 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-05-02 23:32:42,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 26 states have internal predecessors, (32), 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) [2021-05-02 23:32:42,106 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-05-02 23:32:42,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:32:42,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:42,106 INFO L523 BasicCegarLoop]: trace histogram [19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:42,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:32:42,106 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:42,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:42,106 INFO L82 PathProgramCache]: Analyzing trace with hash 454412420, now seen corresponding path program 19 times [2021-05-02 23:32:42,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:42,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966753076] [2021-05-02 23:32:42,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:42,113 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_235 v_main_~n~0_27) InVars {main_~i~0=v_main_~i~0_235, main_~n~0=v_main_~n~0_27} OutVars{main_~i~0=v_main_~i~0_235, main_~n~0=v_main_~n~0_27} AuxVars[] AssignedVars[] [2021-05-02 23:32:42,115 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:42,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:42,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:42,142 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:42,153 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:42,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:42,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:42,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:42,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:42,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:42,575 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:42,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966753076] [2021-05-02 23:32:42,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [966753076] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:42,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:42,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-02 23:32:42,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574564661] [2021-05-02 23:32:42,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 23:32:42,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:42,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 23:32:42,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=829, Unknown=0, NotChecked=0, Total=930 [2021-05-02 23:32:42,576 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 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) [2021-05-02 23:32:43,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:43,384 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2021-05-02 23:32:43,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 23:32:43,385 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 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 39 [2021-05-02 23:32:43,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:43,386 INFO L225 Difference]: With dead ends: 58 [2021-05-02 23:32:43,386 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 23:32:43,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 891.8ms TimeCoverageRelationStatistics Valid=296, Invalid=3126, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:32:43,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 23:32:43,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 23:32:43,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 36 states have internal predecessors, (37), 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) [2021-05-02 23:32:43,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 23:32:43,391 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2021-05-02 23:32:43,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:43,391 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 23:32:43,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 27 states have internal predecessors, (33), 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) [2021-05-02 23:32:43,391 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 23:32:43,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:32:43,391 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:43,391 INFO L523 BasicCegarLoop]: trace histogram [20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:43,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:32:43,392 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:43,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:43,392 INFO L82 PathProgramCache]: Analyzing trace with hash -171517108, now seen corresponding path program 20 times [2021-05-02 23:32:43,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:43,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465796736] [2021-05-02 23:32:43,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:43,396 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_257 v_main_~n~0_28) InVars {main_~i~0=v_main_~i~0_257, main_~n~0=v_main_~n~0_28} OutVars{main_~i~0=v_main_~i~0_257, main_~n~0=v_main_~n~0_28} AuxVars[] AssignedVars[] [2021-05-02 23:32:43,398 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:43,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:43,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:43,418 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:43,429 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:43,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:43,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:43,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:43,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:43,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:43,963 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:43,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465796736] [2021-05-02 23:32:43,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [465796736] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:43,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:43,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-02 23:32:43,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275800022] [2021-05-02 23:32:43,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 23:32:43,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:43,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 23:32:43,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2021-05-02 23:32:43,964 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 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) [2021-05-02 23:32:45,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:45,017 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-05-02 23:32:45,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 23:32:45,018 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 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 40 [2021-05-02 23:32:45,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:45,018 INFO L225 Difference]: With dead ends: 59 [2021-05-02 23:32:45,018 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 23:32:45,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 1161.3ms TimeCoverageRelationStatistics Valid=307, Invalid=3353, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:32:45,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 23:32:45,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-05-02 23:32:45,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 37 states have internal predecessors, (38), 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) [2021-05-02 23:32:45,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-05-02 23:32:45,024 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 40 [2021-05-02 23:32:45,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:45,024 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-05-02 23:32:45,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 28 states have internal predecessors, (34), 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) [2021-05-02 23:32:45,024 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-05-02 23:32:45,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 23:32:45,025 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:45,025 INFO L523 BasicCegarLoop]: trace histogram [21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:45,025 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:32:45,025 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:45,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:45,025 INFO L82 PathProgramCache]: Analyzing trace with hash 1899504004, now seen corresponding path program 21 times [2021-05-02 23:32:45,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:45,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152569042] [2021-05-02 23:32:45,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:45,029 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_280 v_main_~n~0_29) InVars {main_~i~0=v_main_~i~0_280, main_~n~0=v_main_~n~0_29} OutVars{main_~i~0=v_main_~i~0_280, main_~n~0=v_main_~n~0_29} AuxVars[] AssignedVars[] [2021-05-02 23:32:45,030 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:45,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:45,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:45,056 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:45,069 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:45,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:45,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:45,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:45,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:45,716 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:45,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152569042] [2021-05-02 23:32:45,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [152569042] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:45,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:45,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-02 23:32:45,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105704353] [2021-05-02 23:32:45,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 23:32:45,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:45,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 23:32:45,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 23:32:45,717 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 31 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 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) [2021-05-02 23:32:47,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:47,014 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2021-05-02 23:32:47,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 23:32:47,015 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 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 [2021-05-02 23:32:47,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:47,015 INFO L225 Difference]: With dead ends: 60 [2021-05-02 23:32:47,015 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 23:32:47,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1475.3ms TimeCoverageRelationStatistics Valid=318, Invalid=3588, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:32:47,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 23:32:47,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 23:32:47,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.054054054054054) internal successors, (39), 38 states have internal predecessors, (39), 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) [2021-05-02 23:32:47,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-05-02 23:32:47,021 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 41 [2021-05-02 23:32:47,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:47,022 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-05-02 23:32:47,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 29 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) [2021-05-02 23:32:47,022 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-05-02 23:32:47,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 23:32:47,022 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:47,022 INFO L523 BasicCegarLoop]: trace histogram [22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:47,022 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:32:47,023 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:47,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:47,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1676649036, now seen corresponding path program 22 times [2021-05-02 23:32:47,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:47,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988026021] [2021-05-02 23:32:47,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:47,027 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_304 v_main_~n~0_30) InVars {main_~i~0=v_main_~i~0_304, main_~n~0=v_main_~n~0_30} OutVars{main_~i~0=v_main_~i~0_304, main_~n~0=v_main_~n~0_30} AuxVars[] AssignedVars[] [2021-05-02 23:32:47,031 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:47,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:47,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:47,058 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:47,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:47,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:47,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:47,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:47,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:47,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:47,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:47,703 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:47,703 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988026021] [2021-05-02 23:32:47,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [988026021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:47,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:47,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-02 23:32:47,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789899198] [2021-05-02 23:32:47,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 23:32:47,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:47,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 23:32:47,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1031, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 23:32:47,704 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 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) [2021-05-02 23:32:49,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:49,263 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-05-02 23:32:49,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 23:32:49,264 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 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 42 [2021-05-02 23:32:49,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:49,264 INFO L225 Difference]: With dead ends: 61 [2021-05-02 23:32:49,265 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 23:32:49,268 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1566.6ms TimeCoverageRelationStatistics Valid=285, Invalid=3875, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:32:49,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 23:32:49,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 23:32:49,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 39 states have internal predecessors, (40), 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) [2021-05-02 23:32:49,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-05-02 23:32:49,272 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2021-05-02 23:32:49,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:49,272 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-05-02 23:32:49,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 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) [2021-05-02 23:32:49,273 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-05-02 23:32:49,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:32:49,273 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:49,273 INFO L523 BasicCegarLoop]: trace histogram [23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:49,274 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:32:49,274 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:49,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:49,274 INFO L82 PathProgramCache]: Analyzing trace with hash -936887676, now seen corresponding path program 23 times [2021-05-02 23:32:49,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:49,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290614099] [2021-05-02 23:32:49,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:49,281 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_329 v_main_~n~0_31) InVars {main_~i~0=v_main_~i~0_329, main_~n~0=v_main_~n~0_31} OutVars{main_~i~0=v_main_~i~0_329, main_~n~0=v_main_~n~0_31} AuxVars[] AssignedVars[] [2021-05-02 23:32:49,293 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:49,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:49,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:49,318 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:49,330 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:49,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:49,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:49,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:49,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:49,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:49,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:49,963 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:49,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290614099] [2021-05-02 23:32:49,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [290614099] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:49,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:49,963 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-02 23:32:49,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139484579] [2021-05-02 23:32:49,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 23:32:49,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:49,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 23:32:49,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 23:32:49,964 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 33 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 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) [2021-05-02 23:32:51,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:51,065 INFO L93 Difference]: Finished difference Result 62 states and 65 transitions. [2021-05-02 23:32:51,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 23:32:51,066 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 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 43 [2021-05-02 23:32:51,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:51,066 INFO L225 Difference]: With dead ends: 62 [2021-05-02 23:32:51,066 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 23:32:51,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1248.3ms TimeCoverageRelationStatistics Valid=340, Invalid=4082, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:32:51,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 23:32:51,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-02 23:32:51,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 40 states have internal predecessors, (41), 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) [2021-05-02 23:32:51,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 23:32:51,072 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 43 [2021-05-02 23:32:51,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:51,072 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 23:32:51,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.15625) internal successors, (37), 31 states have internal predecessors, (37), 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) [2021-05-02 23:32:51,072 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 23:32:51,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 23:32:51,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:51,072 INFO L523 BasicCegarLoop]: trace histogram [24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:51,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:32:51,073 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:51,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:51,073 INFO L82 PathProgramCache]: Analyzing trace with hash -352147124, now seen corresponding path program 24 times [2021-05-02 23:32:51,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:51,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774873797] [2021-05-02 23:32:51,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:51,076 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_355 v_main_~n~0_32) InVars {main_~i~0=v_main_~i~0_355, main_~n~0=v_main_~n~0_32} OutVars{main_~i~0=v_main_~i~0_355, main_~n~0=v_main_~n~0_32} AuxVars[] AssignedVars[] [2021-05-02 23:32:51,077 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:51,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:51,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:51,119 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:51,129 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:51,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:51,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:51,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:51,764 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:51,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774873797] [2021-05-02 23:32:51,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1774873797] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:51,764 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:51,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-02 23:32:51,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989986682] [2021-05-02 23:32:51,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 23:32:51,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:51,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 23:32:51,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1139, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 23:32:51,766 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 34 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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) [2021-05-02 23:32:53,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:53,203 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2021-05-02 23:32:53,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 23:32:53,203 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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 [2021-05-02 23:32:53,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:53,204 INFO L225 Difference]: With dead ends: 63 [2021-05-02 23:32:53,204 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 23:32:53,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 1489.8ms TimeCoverageRelationStatistics Valid=351, Invalid=4341, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:32:53,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 23:32:53,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 23:32:53,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 40 states have (on average 1.05) internal successors, (42), 41 states have internal predecessors, (42), 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) [2021-05-02 23:32:53,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-05-02 23:32:53,208 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2021-05-02 23:32:53,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:53,208 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-05-02 23:32:53,208 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 32 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) [2021-05-02 23:32:53,209 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-05-02 23:32:53,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:32:53,209 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:53,209 INFO L523 BasicCegarLoop]: trace histogram [25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:53,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:32:53,209 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:53,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:53,209 INFO L82 PathProgramCache]: Analyzing trace with hash 594940804, now seen corresponding path program 25 times [2021-05-02 23:32:53,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:53,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113247968] [2021-05-02 23:32:53,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:53,212 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_382 v_main_~n~0_33) InVars {main_~i~0=v_main_~i~0_382, main_~n~0=v_main_~n~0_33} OutVars{main_~i~0=v_main_~i~0_382, main_~n~0=v_main_~n~0_33} AuxVars[] AssignedVars[] [2021-05-02 23:32:53,214 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:53,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:53,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:53,239 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:53,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:53,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:53,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:53,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:53,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:53,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:54,025 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:54,025 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113247968] [2021-05-02 23:32:54,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2113247968] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:54,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:54,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-02 23:32:54,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400915699] [2021-05-02 23:32:54,026 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 23:32:54,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:54,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 23:32:54,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1207, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 23:32:54,027 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 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) [2021-05-02 23:32:55,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:55,569 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2021-05-02 23:32:55,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 23:32:55,571 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 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 45 [2021-05-02 23:32:55,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:55,571 INFO L225 Difference]: With dead ends: 64 [2021-05-02 23:32:55,571 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 23:32:55,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 1755.8ms TimeCoverageRelationStatistics Valid=362, Invalid=4608, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:32:55,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 23:32:55,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 23:32:55,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.048780487804878) internal successors, (43), 42 states have internal predecessors, (43), 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) [2021-05-02 23:32:55,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-05-02 23:32:55,575 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2021-05-02 23:32:55,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:55,576 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-05-02 23:32:55,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 33 states have internal predecessors, (39), 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) [2021-05-02 23:32:55,576 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-05-02 23:32:55,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:32:55,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:55,576 INFO L523 BasicCegarLoop]: trace histogram [26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:55,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-02 23:32:55,576 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:55,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:55,577 INFO L82 PathProgramCache]: Analyzing trace with hash -110104500, now seen corresponding path program 26 times [2021-05-02 23:32:55,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:55,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82064864] [2021-05-02 23:32:55,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:55,580 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_410 v_main_~n~0_34) InVars {main_~i~0=v_main_~i~0_410, main_~n~0=v_main_~n~0_34} OutVars{main_~i~0=v_main_~i~0_410, main_~n~0=v_main_~n~0_34} AuxVars[] AssignedVars[] [2021-05-02 23:32:55,581 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:55,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:55,597 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:55,607 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:55,621 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:55,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:55,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:55,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:55,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:55,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:55,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:56,392 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:56,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82064864] [2021-05-02 23:32:56,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [82064864] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:56,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:56,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-02 23:32:56,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234340670] [2021-05-02 23:32:56,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 23:32:56,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:56,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 23:32:56,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 23:32:56,393 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 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) [2021-05-02 23:32:57,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:32:57,970 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-05-02 23:32:57,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 23:32:57,971 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 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 46 [2021-05-02 23:32:57,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:32:57,971 INFO L225 Difference]: With dead ends: 65 [2021-05-02 23:32:57,971 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 23:32:57,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 964 ImplicationChecksByTransitivity, 1759.1ms TimeCoverageRelationStatistics Valid=323, Invalid=4933, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:32:57,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 23:32:57,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-05-02 23:32:57,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 43 states have internal predecessors, (44), 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) [2021-05-02 23:32:57,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-05-02 23:32:57,976 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 46 [2021-05-02 23:32:57,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:32:57,976 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-05-02 23:32:57,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 34 states have internal predecessors, (40), 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) [2021-05-02 23:32:57,976 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-05-02 23:32:57,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:32:57,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:32:57,977 INFO L523 BasicCegarLoop]: trace histogram [27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:32:57,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-02 23:32:57,977 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:32:57,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:32:57,977 INFO L82 PathProgramCache]: Analyzing trace with hash -491672444, now seen corresponding path program 27 times [2021-05-02 23:32:57,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:32:57,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755508393] [2021-05-02 23:32:57,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:32:57,984 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_439 v_main_~n~0_35) InVars {main_~i~0=v_main_~i~0_439, main_~n~0=v_main_~n~0_35} OutVars{main_~i~0=v_main_~i~0_439, main_~n~0=v_main_~n~0_35} AuxVars[] AssignedVars[] [2021-05-02 23:32:57,986 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:32:57,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:32:57,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:32:58,017 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:32:58,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:32:58,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:32:58,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:32:58,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:32:58,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:32:58,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:32:58,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755508393] [2021-05-02 23:32:58,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [755508393] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:32:58,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:32:58,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-02 23:32:58,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288612455] [2021-05-02 23:32:58,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 23:32:58,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:32:58,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 23:32:58,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1349, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 23:32:58,877 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 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) [2021-05-02 23:33:00,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:00,551 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-05-02 23:33:00,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 23:33:00,551 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 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 [2021-05-02 23:33:00,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:00,554 INFO L225 Difference]: With dead ends: 66 [2021-05-02 23:33:00,555 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:33:00,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1803.9ms TimeCoverageRelationStatistics Valid=384, Invalid=5166, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:33:00,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:33:00,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 23:33:00,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 44 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) [2021-05-02 23:33:00,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 23:33:00,562 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2021-05-02 23:33:00,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:00,562 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 23:33:00,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 35 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) [2021-05-02 23:33:00,562 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 23:33:00,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:33:00,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:00,562 INFO L523 BasicCegarLoop]: trace histogram [28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:00,562 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-02 23:33:00,563 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:00,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:00,563 INFO L82 PathProgramCache]: Analyzing trace with hash 564623180, now seen corresponding path program 28 times [2021-05-02 23:33:00,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:00,563 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451651962] [2021-05-02 23:33:00,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:00,567 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_469 v_main_~n~0_36) InVars {main_~i~0=v_main_~i~0_469, main_~n~0=v_main_~n~0_36} OutVars{main_~i~0=v_main_~i~0_469, main_~n~0=v_main_~n~0_36} AuxVars[] AssignedVars[] [2021-05-02 23:33:00,569 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:00,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:00,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:00,614 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:00,626 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:00,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:00,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:00,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:00,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:00,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:00,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:01,421 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:01,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451651962] [2021-05-02 23:33:01,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1451651962] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:01,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:01,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-02 23:33:01,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440178979] [2021-05-02 23:33:01,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 23:33:01,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:01,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 23:33:01,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1423, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 23:33:01,423 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 38 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 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) [2021-05-02 23:33:03,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:03,276 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2021-05-02 23:33:03,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 23:33:03,276 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 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 48 [2021-05-02 23:33:03,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:03,277 INFO L225 Difference]: With dead ends: 67 [2021-05-02 23:33:03,277 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 23:33:03,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 1941.7ms TimeCoverageRelationStatistics Valid=395, Invalid=5457, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:33:03,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 23:33:03,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 23:33:03,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 45 states have internal predecessors, (46), 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) [2021-05-02 23:33:03,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-05-02 23:33:03,283 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2021-05-02 23:33:03,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:03,283 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-05-02 23:33:03,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.135135135135135) internal successors, (42), 36 states have internal predecessors, (42), 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) [2021-05-02 23:33:03,283 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-05-02 23:33:03,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 23:33:03,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:03,284 INFO L523 BasicCegarLoop]: trace histogram [29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:03,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-02 23:33:03,284 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:03,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:03,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1049950844, now seen corresponding path program 29 times [2021-05-02 23:33:03,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:03,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988607326] [2021-05-02 23:33:03,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:03,287 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_500 v_main_~n~0_37) InVars {main_~i~0=v_main_~i~0_500, main_~n~0=v_main_~n~0_37} OutVars{main_~i~0=v_main_~i~0_500, main_~n~0=v_main_~n~0_37} AuxVars[] AssignedVars[] [2021-05-02 23:33:03,288 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:03,289 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:03,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:03,328 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:03,346 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:03,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:03,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:03,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:03,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:04,203 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:04,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988607326] [2021-05-02 23:33:04,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1988607326] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:04,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:04,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-02 23:33:04,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965619792] [2021-05-02 23:33:04,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 23:33:04,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:04,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 23:33:04,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1526, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 23:33:04,215 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 39 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 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) [2021-05-02 23:33:06,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:06,154 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2021-05-02 23:33:06,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 23:33:06,155 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 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 49 [2021-05-02 23:33:06,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:06,158 INFO L225 Difference]: With dead ends: 68 [2021-05-02 23:33:06,159 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 23:33:06,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1111 ImplicationChecksByTransitivity, 1990.1ms TimeCoverageRelationStatistics Valid=350, Invalid=5812, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 23:33:06,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 23:33:06,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 23:33:06,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 46 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) [2021-05-02 23:33:06,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-05-02 23:33:06,168 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 49 [2021-05-02 23:33:06,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:06,168 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-05-02 23:33:06,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 1.131578947368421) internal successors, (43), 37 states have internal predecessors, (43), 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) [2021-05-02 23:33:06,170 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-05-02 23:33:06,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 23:33:06,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:06,185 INFO L523 BasicCegarLoop]: trace histogram [30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:06,185 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-02 23:33:06,185 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:06,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:06,185 INFO L82 PathProgramCache]: Analyzing trace with hash 437861964, now seen corresponding path program 30 times [2021-05-02 23:33:06,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:06,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257116604] [2021-05-02 23:33:06,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:06,199 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_532 v_main_~n~0_38) InVars {main_~i~0=v_main_~i~0_532, main_~n~0=v_main_~n~0_38} OutVars{main_~i~0=v_main_~i~0_532, main_~n~0=v_main_~n~0_38} AuxVars[] AssignedVars[] [2021-05-02 23:33:06,201 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:06,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:06,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:06,230 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:06,245 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:06,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:06,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:06,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:06,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:06,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:06,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:07,252 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:07,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257116604] [2021-05-02 23:33:07,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1257116604] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:07,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:07,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-02 23:33:07,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106886989] [2021-05-02 23:33:07,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 23:33:07,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:07,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 23:33:07,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1607, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 23:33:07,254 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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) [2021-05-02 23:33:09,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:09,017 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2021-05-02 23:33:09,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 23:33:09,017 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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 [2021-05-02 23:33:09,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:09,018 INFO L225 Difference]: With dead ends: 69 [2021-05-02 23:33:09,018 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 23:33:09,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 2028.0ms TimeCoverageRelationStatistics Valid=357, Invalid=6123, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:33:09,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 23:33:09,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 23:33:09,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 47 states have internal predecessors, (48), 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) [2021-05-02 23:33:09,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-05-02 23:33:09,023 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 50 [2021-05-02 23:33:09,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:09,023 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-05-02 23:33:09,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 38 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) [2021-05-02 23:33:09,023 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-05-02 23:33:09,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 23:33:09,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:09,024 INFO L523 BasicCegarLoop]: trace histogram [31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:09,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-02 23:33:09,024 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:09,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:09,024 INFO L82 PathProgramCache]: Analyzing trace with hash -684581244, now seen corresponding path program 31 times [2021-05-02 23:33:09,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:09,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847330157] [2021-05-02 23:33:09,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:09,028 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_565 v_main_~n~0_39) InVars {main_~i~0=v_main_~i~0_565, main_~n~0=v_main_~n~0_39} OutVars{main_~i~0=v_main_~i~0_565, main_~n~0=v_main_~n~0_39} AuxVars[] AssignedVars[] [2021-05-02 23:33:09,030 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:09,030 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:09,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:09,051 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:09,063 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:09,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:09,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:09,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:09,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:09,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:09,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:09,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:09,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847330157] [2021-05-02 23:33:09,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1847330157] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:09,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:09,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-02 23:33:09,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039834250] [2021-05-02 23:33:09,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 23:33:09,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:09,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 23:33:09,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1657, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 23:33:09,855 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 41 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 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) [2021-05-02 23:33:11,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:11,404 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2021-05-02 23:33:11,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 23:33:11,405 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 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 51 [2021-05-02 23:33:11,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:11,405 INFO L225 Difference]: With dead ends: 70 [2021-05-02 23:33:11,405 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 23:33:11,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1141 ImplicationChecksByTransitivity, 1684.2ms TimeCoverageRelationStatistics Valid=428, Invalid=6378, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 23:33:11,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 23:33:11,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 23:33:11,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 48 states have internal predecessors, (49), 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) [2021-05-02 23:33:11,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 23:33:11,411 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2021-05-02 23:33:11,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:11,411 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 23:33:11,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.125) internal successors, (45), 39 states have internal predecessors, (45), 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) [2021-05-02 23:33:11,411 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 23:33:11,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 23:33:11,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:11,412 INFO L523 BasicCegarLoop]: trace histogram [32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:11,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-02 23:33:11,412 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:11,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:11,412 INFO L82 PathProgramCache]: Analyzing trace with hash -1120582324, now seen corresponding path program 32 times [2021-05-02 23:33:11,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:11,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664067023] [2021-05-02 23:33:11,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:11,429 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_599 v_main_~n~0_40) InVars {main_~i~0=v_main_~i~0_599, main_~n~0=v_main_~n~0_40} OutVars{main_~i~0=v_main_~i~0_599, main_~n~0=v_main_~n~0_40} AuxVars[] AssignedVars[] [2021-05-02 23:33:11,431 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:11,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:11,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:11,462 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:11,479 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:11,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:11,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:11,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:11,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:11,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:11,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:12,455 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:12,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664067023] [2021-05-02 23:33:12,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1664067023] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:12,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:12,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-02 23:33:12,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207853736] [2021-05-02 23:33:12,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 23:33:12,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:12,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 23:33:12,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1739, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 23:33:12,457 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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) [2021-05-02 23:33:14,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:14,257 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2021-05-02 23:33:14,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 23:33:14,258 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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 [2021-05-02 23:33:14,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:14,261 INFO L225 Difference]: With dead ends: 71 [2021-05-02 23:33:14,261 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 23:33:14,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1192 ImplicationChecksByTransitivity, 2050.1ms TimeCoverageRelationStatistics Valid=439, Invalid=6701, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:33:14,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 23:33:14,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-02 23:33:14,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 49 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) [2021-05-02 23:33:14,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-05-02 23:33:14,268 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2021-05-02 23:33:14,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:14,268 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-05-02 23:33:14,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 40 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) [2021-05-02 23:33:14,268 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-05-02 23:33:14,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 23:33:14,268 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:14,268 INFO L523 BasicCegarLoop]: trace histogram [33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:14,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-02 23:33:14,268 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:14,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:14,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1751713916, now seen corresponding path program 33 times [2021-05-02 23:33:14,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:14,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970870644] [2021-05-02 23:33:14,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:14,286 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_634 v_main_~n~0_41) InVars {main_~i~0=v_main_~i~0_634, main_~n~0=v_main_~n~0_41} OutVars{main_~i~0=v_main_~i~0_634, main_~n~0=v_main_~n~0_41} AuxVars[] AssignedVars[] [2021-05-02 23:33:14,287 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:14,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:14,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:14,311 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:14,325 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:14,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:14,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:14,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:14,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:14,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:14,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:15,343 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:15,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970870644] [2021-05-02 23:33:15,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1970870644] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:15,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:15,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-02 23:33:15,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456616238] [2021-05-02 23:33:15,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 23:33:15,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:15,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 23:33:15,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1823, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 23:33:15,345 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 43 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 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) [2021-05-02 23:33:17,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:17,775 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2021-05-02 23:33:17,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 23:33:17,775 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 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 53 [2021-05-02 23:33:17,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:17,776 INFO L225 Difference]: With dead ends: 72 [2021-05-02 23:33:17,776 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 23:33:17,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 2422.7ms TimeCoverageRelationStatistics Valid=450, Invalid=7032, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 23:33:17,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 23:33:17,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-02 23:33:17,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 50 states have internal predecessors, (51), 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) [2021-05-02 23:33:17,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-05-02 23:33:17,792 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 53 [2021-05-02 23:33:17,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:17,792 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-05-02 23:33:17,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 1.119047619047619) internal successors, (47), 41 states have internal predecessors, (47), 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) [2021-05-02 23:33:17,792 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-05-02 23:33:17,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 23:33:17,792 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:17,792 INFO L523 BasicCegarLoop]: trace histogram [34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:17,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-02 23:33:17,792 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:17,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:17,793 INFO L82 PathProgramCache]: Analyzing trace with hash 158043212, now seen corresponding path program 34 times [2021-05-02 23:33:17,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:17,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907962486] [2021-05-02 23:33:17,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:17,796 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_670 v_main_~n~0_42) InVars {main_~i~0=v_main_~i~0_670, main_~n~0=v_main_~n~0_42} OutVars{main_~i~0=v_main_~i~0_670, main_~n~0=v_main_~n~0_42} AuxVars[] AssignedVars[] [2021-05-02 23:33:17,798 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:17,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:17,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:17,823 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:17,837 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:17,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:17,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:17,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:18,920 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:18,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907962486] [2021-05-02 23:33:18,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1907962486] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:18,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:18,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-02 23:33:18,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624727224] [2021-05-02 23:33:18,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 23:33:18,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:18,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 23:33:18,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1909, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 23:33:18,921 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 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) [2021-05-02 23:33:21,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:21,354 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2021-05-02 23:33:21,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 23:33:21,355 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 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 54 [2021-05-02 23:33:21,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:21,355 INFO L225 Difference]: With dead ends: 73 [2021-05-02 23:33:21,355 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 23:33:21,356 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 2524.3ms TimeCoverageRelationStatistics Valid=461, Invalid=7371, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:33:21,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 23:33:21,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 23:33:21,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 50 states have (on average 1.04) internal successors, (52), 51 states have internal predecessors, (52), 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) [2021-05-02 23:33:21,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-05-02 23:33:21,360 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2021-05-02 23:33:21,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:21,360 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-05-02 23:33:21,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 42 states have internal predecessors, (48), 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) [2021-05-02 23:33:21,360 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-05-02 23:33:21,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 23:33:21,361 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:21,361 INFO L523 BasicCegarLoop]: trace histogram [35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:21,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-02 23:33:21,361 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:21,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:21,361 INFO L82 PathProgramCache]: Analyzing trace with hash -769027964, now seen corresponding path program 35 times [2021-05-02 23:33:21,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:21,361 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106848573] [2021-05-02 23:33:21,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:21,364 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_707 v_main_~n~0_43) InVars {main_~i~0=v_main_~i~0_707, main_~n~0=v_main_~n~0_43} OutVars{main_~i~0=v_main_~i~0_707, main_~n~0=v_main_~n~0_43} AuxVars[] AssignedVars[] [2021-05-02 23:33:21,366 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:21,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:21,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:21,393 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:21,409 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:21,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:21,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:21,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:21,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:21,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:21,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:22,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:22,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106848573] [2021-05-02 23:33:22,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1106848573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:22,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:22,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-02 23:33:22,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739384203] [2021-05-02 23:33:22,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 23:33:22,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:22,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 23:33:22,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2030, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 23:33:22,584 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 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) [2021-05-02 23:33:25,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:25,271 INFO L93 Difference]: Finished difference Result 74 states and 77 transitions. [2021-05-02 23:33:25,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 23:33:25,272 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 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 [2021-05-02 23:33:25,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:25,272 INFO L225 Difference]: With dead ends: 74 [2021-05-02 23:33:25,272 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 23:33:25,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 2828.3ms TimeCoverageRelationStatistics Valid=404, Invalid=7786, Unknown=0, NotChecked=0, Total=8190 [2021-05-02 23:33:25,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 23:33:25,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 23:33:25,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 52 states have internal predecessors, (53), 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) [2021-05-02 23:33:25,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 23:33:25,286 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 55 [2021-05-02 23:33:25,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:25,287 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 23:33:25,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 43 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) [2021-05-02 23:33:25,287 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 23:33:25,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 23:33:25,287 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:25,287 INFO L523 BasicCegarLoop]: trace histogram [36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:25,287 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-02 23:33:25,287 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:25,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:25,290 INFO L82 PathProgramCache]: Analyzing trace with hash 556536652, now seen corresponding path program 36 times [2021-05-02 23:33:25,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:25,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512091611] [2021-05-02 23:33:25,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:25,295 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_745 v_main_~n~0_44) InVars {main_~i~0=v_main_~i~0_745, main_~n~0=v_main_~n~0_44} OutVars{main_~i~0=v_main_~i~0_745, main_~n~0=v_main_~n~0_44} AuxVars[] AssignedVars[] [2021-05-02 23:33:25,298 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:25,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:25,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:25,326 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:25,340 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:25,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:25,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:25,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:25,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:26,644 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:26,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512091611] [2021-05-02 23:33:26,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1512091611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:26,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:26,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-02 23:33:26,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147086560] [2021-05-02 23:33:26,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 23:33:26,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:26,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 23:33:26,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2087, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 23:33:26,645 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 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) [2021-05-02 23:33:29,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:29,316 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2021-05-02 23:33:29,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 23:33:29,316 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 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 56 [2021-05-02 23:33:29,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:29,317 INFO L225 Difference]: With dead ends: 75 [2021-05-02 23:33:29,317 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 23:33:29,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 2911.1ms TimeCoverageRelationStatistics Valid=483, Invalid=8073, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 23:33:29,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 23:33:29,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-05-02 23:33:29,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 53 states have internal predecessors, (54), 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) [2021-05-02 23:33:29,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-05-02 23:33:29,322 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2021-05-02 23:33:29,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:29,322 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-05-02 23:33:29,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 44 states have internal predecessors, (50), 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) [2021-05-02 23:33:29,322 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-05-02 23:33:29,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 23:33:29,323 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:29,323 INFO L523 BasicCegarLoop]: trace histogram [37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:29,323 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-02 23:33:29,323 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:29,323 INFO L82 PathProgramCache]: Analyzing trace with hash -1300633212, now seen corresponding path program 37 times [2021-05-02 23:33:29,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:29,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030052122] [2021-05-02 23:33:29,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:29,326 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_784 v_main_~n~0_45) InVars {main_~i~0=v_main_~i~0_784, main_~n~0=v_main_~n~0_45} OutVars{main_~i~0=v_main_~i~0_784, main_~n~0=v_main_~n~0_45} AuxVars[] AssignedVars[] [2021-05-02 23:33:29,327 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:29,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:29,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:29,355 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:29,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:29,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:29,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:29,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:29,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:29,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:29,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:30,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:30,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030052122] [2021-05-02 23:33:30,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1030052122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:30,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:30,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-02 23:33:30,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334774621] [2021-05-02 23:33:30,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 23:33:30,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:30,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 23:33:30,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2179, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 23:33:30,690 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 47 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 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) [2021-05-02 23:33:33,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:33,506 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2021-05-02 23:33:33,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 23:33:33,506 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 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 57 [2021-05-02 23:33:33,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:33,507 INFO L225 Difference]: With dead ends: 76 [2021-05-02 23:33:33,507 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 23:33:33,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1462 ImplicationChecksByTransitivity, 2970.9ms TimeCoverageRelationStatistics Valid=494, Invalid=8436, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 23:33:33,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 23:33:33,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 23:33:33,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 54 states have internal predecessors, (55), 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) [2021-05-02 23:33:33,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-05-02 23:33:33,512 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2021-05-02 23:33:33,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:33,512 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-05-02 23:33:33,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 46 states have (on average 1.108695652173913) internal successors, (51), 45 states have internal predecessors, (51), 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) [2021-05-02 23:33:33,513 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-05-02 23:33:33,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 23:33:33,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:33,513 INFO L523 BasicCegarLoop]: trace histogram [38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:33,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-02 23:33:33,513 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:33,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:33,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1256643148, now seen corresponding path program 38 times [2021-05-02 23:33:33,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:33,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701286143] [2021-05-02 23:33:33,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:33,517 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_824 v_main_~n~0_46) InVars {main_~i~0=v_main_~i~0_824, main_~n~0=v_main_~n~0_46} OutVars{main_~i~0=v_main_~i~0_824, main_~n~0=v_main_~n~0_46} AuxVars[] AssignedVars[] [2021-05-02 23:33:33,518 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:33,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:33,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:33,555 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:33,572 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:33,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:33,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:33,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:33,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:34,939 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:34,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701286143] [2021-05-02 23:33:34,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1701286143] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:34,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:34,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-02 23:33:34,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044515122] [2021-05-02 23:33:34,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 23:33:34,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:34,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 23:33:34,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2309, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 23:33:34,940 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 48 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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) [2021-05-02 23:33:37,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:37,968 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 23:33:37,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 23:33:37,969 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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 [2021-05-02 23:33:37,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:37,970 INFO L225 Difference]: With dead ends: 77 [2021-05-02 23:33:37,970 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 23:33:37,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1606 ImplicationChecksByTransitivity, 3187.6ms TimeCoverageRelationStatistics Valid=431, Invalid=8881, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 23:33:37,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 23:33:37,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-02 23:33:37,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.037037037037037) internal successors, (56), 55 states have internal predecessors, (56), 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) [2021-05-02 23:33:37,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-05-02 23:33:37,976 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 58 [2021-05-02 23:33:37,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:37,976 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-05-02 23:33:37,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 46 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) [2021-05-02 23:33:37,976 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-05-02 23:33:37,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 23:33:37,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:37,976 INFO L523 BasicCegarLoop]: trace histogram [39, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:37,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-02 23:33:37,977 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:37,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:37,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1072168316, now seen corresponding path program 39 times [2021-05-02 23:33:37,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:37,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553305920] [2021-05-02 23:33:37,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:37,980 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_865 v_main_~n~0_47) InVars {main_~i~0=v_main_~i~0_865, main_~n~0=v_main_~n~0_47} OutVars{main_~i~0=v_main_~i~0_865, main_~n~0=v_main_~n~0_47} AuxVars[] AssignedVars[] [2021-05-02 23:33:37,981 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:37,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:37,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:38,010 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:38,028 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:38,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:38,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:38,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:38,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:38,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:39,449 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:39,449 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553305920] [2021-05-02 23:33:39,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1553305920] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:39,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:39,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-02 23:33:39,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74373280] [2021-05-02 23:33:39,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 23:33:39,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:39,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 23:33:39,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2406, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 23:33:39,450 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 49 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 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) [2021-05-02 23:33:42,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:42,560 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-05-02 23:33:42,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 23:33:42,560 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 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 59 [2021-05-02 23:33:42,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:42,561 INFO L225 Difference]: With dead ends: 78 [2021-05-02 23:33:42,561 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 23:33:42,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 3322.8ms TimeCoverageRelationStatistics Valid=440, Invalid=9262, Unknown=0, NotChecked=0, Total=9702 [2021-05-02 23:33:42,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 23:33:42,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 23:33:42,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 56 states have internal predecessors, (57), 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) [2021-05-02 23:33:42,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 23:33:42,567 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2021-05-02 23:33:42,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:42,567 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 23:33:42,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 47 states have internal predecessors, (53), 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) [2021-05-02 23:33:42,567 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 23:33:42,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 23:33:42,567 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:42,568 INFO L523 BasicCegarLoop]: trace histogram [40, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:42,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-02 23:33:42,568 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:42,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:42,568 INFO L82 PathProgramCache]: Analyzing trace with hash -250879668, now seen corresponding path program 40 times [2021-05-02 23:33:42,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:42,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851421884] [2021-05-02 23:33:42,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:42,571 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_907 v_main_~n~0_48) InVars {main_~i~0=v_main_~i~0_907, main_~n~0=v_main_~n~0_48} OutVars{main_~i~0=v_main_~i~0_907, main_~n~0=v_main_~n~0_48} AuxVars[] AssignedVars[] [2021-05-02 23:33:42,573 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:42,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:42,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:42,604 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:42,621 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:42,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:42,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:42,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:42,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:42,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:42,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:44,123 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:44,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851421884] [2021-05-02 23:33:44,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1851421884] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:44,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:44,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-02 23:33:44,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647778362] [2021-05-02 23:33:44,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 23:33:44,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:44,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 23:33:44,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2467, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 23:33:44,124 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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) [2021-05-02 23:33:47,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:47,315 INFO L93 Difference]: Finished difference Result 79 states and 82 transitions. [2021-05-02 23:33:47,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 23:33:47,316 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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 [2021-05-02 23:33:47,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:47,316 INFO L225 Difference]: With dead ends: 79 [2021-05-02 23:33:47,316 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 23:33:47,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1636 ImplicationChecksByTransitivity, 3448.1ms TimeCoverageRelationStatistics Valid=527, Invalid=9573, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 23:33:47,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 23:33:47,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 23:33:47,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 57 states have internal predecessors, (58), 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) [2021-05-02 23:33:47,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-02 23:33:47,322 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2021-05-02 23:33:47,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:47,322 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-02 23:33:47,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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) [2021-05-02 23:33:47,322 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-02 23:33:47,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 23:33:47,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:47,322 INFO L523 BasicCegarLoop]: trace histogram [41, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:47,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-02 23:33:47,322 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:47,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:47,323 INFO L82 PathProgramCache]: Analyzing trace with hash -560735356, now seen corresponding path program 41 times [2021-05-02 23:33:47,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:47,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [384737724] [2021-05-02 23:33:47,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:47,326 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_950 v_main_~n~0_49) InVars {main_~i~0=v_main_~i~0_950, main_~n~0=v_main_~n~0_49} OutVars{main_~i~0=v_main_~i~0_950, main_~n~0=v_main_~n~0_49} AuxVars[] AssignedVars[] [2021-05-02 23:33:47,327 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:47,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:47,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:47,357 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:47,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:47,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:47,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:47,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:47,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:47,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:47,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:49,078 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:49,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [384737724] [2021-05-02 23:33:49,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [384737724] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:49,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:49,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-02 23:33:49,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059478465] [2021-05-02 23:33:49,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 23:33:49,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:49,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 23:33:49,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2567, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 23:33:49,079 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 51 states, 50 states have (on average 1.1) internal successors, (55), 49 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) [2021-05-02 23:33:52,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:52,039 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2021-05-02 23:33:52,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 23:33:52,039 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.1) internal successors, (55), 49 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 [2021-05-02 23:33:52,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:52,040 INFO L225 Difference]: With dead ends: 80 [2021-05-02 23:33:52,040 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 23:33:52,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 3498.7ms TimeCoverageRelationStatistics Valid=538, Invalid=9968, Unknown=0, NotChecked=0, Total=10506 [2021-05-02 23:33:52,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 23:33:52,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 23:33:52,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 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) [2021-05-02 23:33:52,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-05-02 23:33:52,046 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 61 [2021-05-02 23:33:52,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:52,046 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-05-02 23:33:52,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 50 states have (on average 1.1) internal successors, (55), 49 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) [2021-05-02 23:33:52,046 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-05-02 23:33:52,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 23:33:52,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:52,046 INFO L523 BasicCegarLoop]: trace histogram [42, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:52,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-02 23:33:52,047 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:52,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:52,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1576327092, now seen corresponding path program 42 times [2021-05-02 23:33:52,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:52,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992389234] [2021-05-02 23:33:52,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:52,050 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_994 v_main_~n~0_50) InVars {main_~i~0=v_main_~i~0_994, main_~n~0=v_main_~n~0_50} OutVars{main_~i~0=v_main_~i~0_994, main_~n~0=v_main_~n~0_50} AuxVars[] AssignedVars[] [2021-05-02 23:33:52,051 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:52,052 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:52,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:52,076 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:52,092 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:52,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:52,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:52,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:52,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:52,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:52,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:53,637 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:53,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992389234] [2021-05-02 23:33:53,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [992389234] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:53,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:53,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-02 23:33:53,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321102874] [2021-05-02 23:33:53,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 23:33:53,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:53,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 23:33:53,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2709, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 23:33:53,638 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 52 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 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) [2021-05-02 23:33:56,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:33:56,912 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2021-05-02 23:33:56,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 23:33:56,913 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 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 62 [2021-05-02 23:33:56,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:33:56,914 INFO L225 Difference]: With dead ends: 81 [2021-05-02 23:33:56,914 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 23:33:56,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1852 ImplicationChecksByTransitivity, 3543.7ms TimeCoverageRelationStatistics Valid=467, Invalid=10453, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 23:33:56,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 23:33:56,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-05-02 23:33:56,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 59 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) [2021-05-02 23:33:56,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-05-02 23:33:56,920 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 62 [2021-05-02 23:33:56,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:33:56,920 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-05-02 23:33:56,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 50 states have internal predecessors, (56), 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) [2021-05-02 23:33:56,920 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-05-02 23:33:56,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 23:33:56,920 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:33:56,920 INFO L523 BasicCegarLoop]: trace histogram [43, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:33:56,921 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-02 23:33:56,921 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:33:56,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:33:56,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1300067460, now seen corresponding path program 43 times [2021-05-02 23:33:56,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:33:56,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351758606] [2021-05-02 23:33:56,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:33:56,924 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1039 v_main_~n~0_51) InVars {main_~i~0=v_main_~i~0_1039, main_~n~0=v_main_~n~0_51} OutVars{main_~i~0=v_main_~i~0_1039, main_~n~0=v_main_~n~0_51} AuxVars[] AssignedVars[] [2021-05-02 23:33:56,925 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:33:56,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:33:56,932 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:33:56,955 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:33:56,972 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:33:56,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:57,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:33:57,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:57,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:33:57,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:33:57,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:33:58,534 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:33:58,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351758606] [2021-05-02 23:33:58,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [351758606] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:33:58,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:33:58,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-02 23:33:58,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219880980] [2021-05-02 23:33:58,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 23:33:58,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:33:58,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 23:33:58,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2773, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 23:33:58,537 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 53 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 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) [2021-05-02 23:34:01,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:01,742 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2021-05-02 23:34:01,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 23:34:01,743 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 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 [2021-05-02 23:34:01,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:01,743 INFO L225 Difference]: With dead ends: 82 [2021-05-02 23:34:01,743 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 23:34:01,744 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1819 ImplicationChecksByTransitivity, 3479.1ms TimeCoverageRelationStatistics Valid=560, Invalid=10782, Unknown=0, NotChecked=0, Total=11342 [2021-05-02 23:34:01,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 23:34:01,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 23:34:01,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 60 states have internal predecessors, (61), 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) [2021-05-02 23:34:01,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2021-05-02 23:34:01,749 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2021-05-02 23:34:01,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:01,750 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2021-05-02 23:34:01,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 51 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) [2021-05-02 23:34:01,750 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2021-05-02 23:34:01,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 23:34:01,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:01,750 INFO L523 BasicCegarLoop]: trace histogram [44, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:01,750 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-02 23:34:01,750 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:01,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:01,750 INFO L82 PathProgramCache]: Analyzing trace with hash 273985356, now seen corresponding path program 44 times [2021-05-02 23:34:01,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:01,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732079306] [2021-05-02 23:34:01,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:01,754 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1085 v_main_~n~0_52) InVars {main_~i~0=v_main_~i~0_1085, main_~n~0=v_main_~n~0_52} OutVars{main_~i~0=v_main_~i~0_1085, main_~n~0=v_main_~n~0_52} AuxVars[] AssignedVars[] [2021-05-02 23:34:01,755 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:01,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:01,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:01,785 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:01,801 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:01,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:01,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:01,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:01,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:01,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:01,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:03,522 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:03,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732079306] [2021-05-02 23:34:03,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [732079306] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:03,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:03,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-02 23:34:03,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042685810] [2021-05-02 23:34:03,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 23:34:03,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:03,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 23:34:03,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 23:34:03,523 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 54 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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) [2021-05-02 23:34:07,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:07,066 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-05-02 23:34:07,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 23:34:07,066 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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 [2021-05-02 23:34:07,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:07,067 INFO L225 Difference]: With dead ends: 83 [2021-05-02 23:34:07,067 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 23:34:07,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1882 ImplicationChecksByTransitivity, 3853.1ms TimeCoverageRelationStatistics Valid=571, Invalid=11201, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 23:34:07,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 23:34:07,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 23:34:07,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 61 states have internal predecessors, (62), 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) [2021-05-02 23:34:07,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-05-02 23:34:07,073 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 64 [2021-05-02 23:34:07,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:07,073 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-05-02 23:34:07,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 52 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) [2021-05-02 23:34:07,073 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-05-02 23:34:07,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 23:34:07,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:07,073 INFO L523 BasicCegarLoop]: trace histogram [45, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:07,073 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-02 23:34:07,073 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:07,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:07,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1469788796, now seen corresponding path program 45 times [2021-05-02 23:34:07,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:07,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848140727] [2021-05-02 23:34:07,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:07,077 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1132 v_main_~n~0_53) InVars {main_~i~0=v_main_~i~0_1132, main_~n~0=v_main_~n~0_53} OutVars{main_~i~0=v_main_~i~0_1132, main_~n~0=v_main_~n~0_53} AuxVars[] AssignedVars[] [2021-05-02 23:34:07,078 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:07,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:07,095 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:07,108 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:07,124 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:07,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:07,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:07,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:07,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:07,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:07,215 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:09,016 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:09,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848140727] [2021-05-02 23:34:09,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1848140727] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:09,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:09,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-02 23:34:09,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640551911] [2021-05-02 23:34:09,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 23:34:09,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:09,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 23:34:09,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2987, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 23:34:09,017 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 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) [2021-05-02 23:34:13,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:13,025 INFO L93 Difference]: Finished difference Result 84 states and 87 transitions. [2021-05-02 23:34:13,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-02 23:34:13,026 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 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 65 [2021-05-02 23:34:13,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:13,026 INFO L225 Difference]: With dead ends: 84 [2021-05-02 23:34:13,027 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 23:34:13,027 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1946 ImplicationChecksByTransitivity, 4196.7ms TimeCoverageRelationStatistics Valid=582, Invalid=11628, Unknown=0, NotChecked=0, Total=12210 [2021-05-02 23:34:13,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 23:34:13,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-02 23:34:13,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 62 states have internal predecessors, (63), 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) [2021-05-02 23:34:13,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-05-02 23:34:13,038 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 65 [2021-05-02 23:34:13,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:13,038 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-05-02 23:34:13,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 53 states have internal predecessors, (59), 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) [2021-05-02 23:34:13,038 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-05-02 23:34:13,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 23:34:13,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:13,038 INFO L523 BasicCegarLoop]: trace histogram [46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:13,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-02 23:34:13,039 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:13,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:13,039 INFO L82 PathProgramCache]: Analyzing trace with hash 307787340, now seen corresponding path program 46 times [2021-05-02 23:34:13,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:13,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220840655] [2021-05-02 23:34:13,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:13,042 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1180 v_main_~n~0_54) InVars {main_~i~0=v_main_~i~0_1180, main_~n~0=v_main_~n~0_54} OutVars{main_~i~0=v_main_~i~0_1180, main_~n~0=v_main_~n~0_54} AuxVars[] AssignedVars[] [2021-05-02 23:34:13,050 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:13,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:13,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:13,077 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:13,093 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:13,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:13,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:13,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:13,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:13,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:13,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:14,899 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:14,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220840655] [2021-05-02 23:34:14,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1220840655] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:14,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:14,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-02 23:34:14,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24528717] [2021-05-02 23:34:14,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 23:34:14,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:14,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 23:34:14,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3097, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 23:34:14,900 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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) [2021-05-02 23:34:18,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:18,809 INFO L93 Difference]: Finished difference Result 85 states and 88 transitions. [2021-05-02 23:34:18,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 23:34:18,810 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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 [2021-05-02 23:34:18,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:18,811 INFO L225 Difference]: With dead ends: 85 [2021-05-02 23:34:18,811 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 23:34:18,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 4130.1ms TimeCoverageRelationStatistics Valid=593, Invalid=12063, Unknown=0, NotChecked=0, Total=12656 [2021-05-02 23:34:18,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 23:34:18,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-02 23:34:18,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 62 states have (on average 1.032258064516129) internal successors, (64), 63 states have internal predecessors, (64), 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) [2021-05-02 23:34:18,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2021-05-02 23:34:18,817 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 66 [2021-05-02 23:34:18,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:18,817 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2021-05-02 23:34:18,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 54 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) [2021-05-02 23:34:18,817 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2021-05-02 23:34:18,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 23:34:18,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:18,818 INFO L523 BasicCegarLoop]: trace histogram [47, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:18,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-02 23:34:18,818 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:18,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:18,818 INFO L82 PathProgramCache]: Analyzing trace with hash -421927292, now seen corresponding path program 47 times [2021-05-02 23:34:18,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:18,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049891003] [2021-05-02 23:34:18,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:18,824 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1229 v_main_~n~0_55) InVars {main_~i~0=v_main_~i~0_1229, main_~n~0=v_main_~n~0_55} OutVars{main_~i~0=v_main_~i~0_1229, main_~n~0=v_main_~n~0_55} AuxVars[] AssignedVars[] [2021-05-02 23:34:18,826 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:18,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:18,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:18,855 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:18,872 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:18,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:18,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:18,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:18,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:18,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:18,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:20,729 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:20,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049891003] [2021-05-02 23:34:20,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2049891003] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:20,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:20,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-02 23:34:20,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262066302] [2021-05-02 23:34:20,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 23:34:20,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:20,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 23:34:20,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=3254, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 23:34:20,731 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 57 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 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) [2021-05-02 23:34:24,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:24,760 INFO L93 Difference]: Finished difference Result 86 states and 89 transitions. [2021-05-02 23:34:24,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 23:34:24,761 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 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 67 [2021-05-02 23:34:24,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:24,762 INFO L225 Difference]: With dead ends: 86 [2021-05-02 23:34:24,762 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 23:34:24,763 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 4277.3ms TimeCoverageRelationStatistics Valid=512, Invalid=12598, Unknown=0, NotChecked=0, Total=13110 [2021-05-02 23:34:24,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 23:34:24,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 23:34:24,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 64 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) [2021-05-02 23:34:24,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 23:34:24,769 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2021-05-02 23:34:24,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:24,769 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 23:34:24,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 55 states have internal predecessors, (61), 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) [2021-05-02 23:34:24,769 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 23:34:24,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 23:34:24,769 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:24,769 INFO L523 BasicCegarLoop]: trace histogram [48, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:24,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-02 23:34:24,769 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:24,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:24,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1568244404, now seen corresponding path program 48 times [2021-05-02 23:34:24,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:24,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101952844] [2021-05-02 23:34:24,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:24,774 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1279 v_main_~n~0_56) InVars {main_~i~0=v_main_~i~0_1279, main_~n~0=v_main_~n~0_56} OutVars{main_~i~0=v_main_~i~0_1279, main_~n~0=v_main_~n~0_56} AuxVars[] AssignedVars[] [2021-05-02 23:34:24,775 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:24,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:24,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:24,805 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:24,823 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:24,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:24,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:24,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:24,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:26,769 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:26,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101952844] [2021-05-02 23:34:26,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2101952844] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:26,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:26,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-02 23:34:26,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371451253] [2021-05-02 23:34:26,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 23:34:26,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:26,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 23:34:26,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3369, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 23:34:26,771 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 58 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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) [2021-05-02 23:34:30,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:30,963 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2021-05-02 23:34:30,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 23:34:30,964 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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 [2021-05-02 23:34:30,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:30,965 INFO L225 Difference]: With dead ends: 87 [2021-05-02 23:34:30,965 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 23:34:30,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2251 ImplicationChecksByTransitivity, 4451.7ms TimeCoverageRelationStatistics Valid=521, Invalid=13051, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 23:34:30,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 23:34:30,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2021-05-02 23:34:30,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 64 states have (on average 1.03125) internal successors, (66), 65 states have internal predecessors, (66), 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) [2021-05-02 23:34:30,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-05-02 23:34:30,971 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2021-05-02 23:34:30,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:30,971 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-05-02 23:34:30,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 57 states have (on average 1.087719298245614) internal successors, (62), 56 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) [2021-05-02 23:34:30,972 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-05-02 23:34:30,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 23:34:30,972 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:30,972 INFO L523 BasicCegarLoop]: trace histogram [49, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:30,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-02 23:34:30,972 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:30,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:30,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1550630788, now seen corresponding path program 49 times [2021-05-02 23:34:30,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:30,972 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547494102] [2021-05-02 23:34:30,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:30,976 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1330 v_main_~n~0_57) InVars {main_~i~0=v_main_~i~0_1330, main_~n~0=v_main_~n~0_57} OutVars{main_~i~0=v_main_~i~0_1330, main_~n~0=v_main_~n~0_57} AuxVars[] AssignedVars[] [2021-05-02 23:34:30,977 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:30,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:31,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:31,013 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:31,030 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:31,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:31,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:31,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:31,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:31,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:31,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:33,033 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:33,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547494102] [2021-05-02 23:34:33,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1547494102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:33,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:33,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-02 23:34:33,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092375810] [2021-05-02 23:34:33,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 23:34:33,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:33,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 23:34:33,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3486, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 23:34:33,034 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 59 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 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) [2021-05-02 23:34:37,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:37,393 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2021-05-02 23:34:37,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-02 23:34:37,394 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 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 [2021-05-02 23:34:37,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:37,394 INFO L225 Difference]: With dead ends: 88 [2021-05-02 23:34:37,394 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 23:34:37,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2321 ImplicationChecksByTransitivity, 4601.2ms TimeCoverageRelationStatistics Valid=530, Invalid=13512, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 23:34:37,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 23:34:37,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 23:34:37,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 66 states have internal predecessors, (67), 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) [2021-05-02 23:34:37,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2021-05-02 23:34:37,401 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 69 [2021-05-02 23:34:37,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:37,402 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2021-05-02 23:34:37,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 58 states have (on average 1.0862068965517242) internal successors, (63), 57 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) [2021-05-02 23:34:37,402 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2021-05-02 23:34:37,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 23:34:37,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:37,402 INFO L523 BasicCegarLoop]: trace histogram [50, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:37,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-02 23:34:37,402 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:37,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:37,403 INFO L82 PathProgramCache]: Analyzing trace with hash -548486068, now seen corresponding path program 50 times [2021-05-02 23:34:37,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:37,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548818540] [2021-05-02 23:34:37,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:37,406 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1382 v_main_~n~0_58) InVars {main_~i~0=v_main_~i~0_1382, main_~n~0=v_main_~n~0_58} OutVars{main_~i~0=v_main_~i~0_1382, main_~n~0=v_main_~n~0_58} AuxVars[] AssignedVars[] [2021-05-02 23:34:37,408 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:37,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:37,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:37,439 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:37,457 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:37,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:37,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:37,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:37,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:37,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:37,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:39,562 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:39,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548818540] [2021-05-02 23:34:39,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1548818540] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:39,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:39,563 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-02 23:34:39,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961976755] [2021-05-02 23:34:39,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 23:34:39,563 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:39,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 23:34:39,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=3605, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 23:34:39,564 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 58 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) [2021-05-02 23:34:44,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:44,089 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2021-05-02 23:34:44,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 23:34:44,090 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 58 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 70 [2021-05-02 23:34:44,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:44,090 INFO L225 Difference]: With dead ends: 89 [2021-05-02 23:34:44,090 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 23:34:44,091 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2392 ImplicationChecksByTransitivity, 4782.1ms TimeCoverageRelationStatistics Valid=539, Invalid=13981, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 23:34:44,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 23:34:44,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2021-05-02 23:34:44,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 67 states have internal predecessors, (68), 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) [2021-05-02 23:34:44,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-05-02 23:34:44,097 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 70 [2021-05-02 23:34:44,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:44,097 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-05-02 23:34:44,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 58 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) [2021-05-02 23:34:44,097 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-05-02 23:34:44,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 23:34:44,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:44,098 INFO L523 BasicCegarLoop]: trace histogram [51, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:44,098 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-02 23:34:44,098 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:44,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:44,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1196599164, now seen corresponding path program 51 times [2021-05-02 23:34:44,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:44,098 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951398561] [2021-05-02 23:34:44,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:44,102 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1435 v_main_~n~0_59) InVars {main_~i~0=v_main_~i~0_1435, main_~n~0=v_main_~n~0_59} OutVars{main_~i~0=v_main_~i~0_1435, main_~n~0=v_main_~n~0_59} AuxVars[] AssignedVars[] [2021-05-02 23:34:44,103 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:44,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:44,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:44,134 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:44,151 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:44,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:44,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:44,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:44,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:46,419 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:46,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951398561] [2021-05-02 23:34:46,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [951398561] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:46,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:46,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-02 23:34:46,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782203801] [2021-05-02 23:34:46,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 23:34:46,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:46,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 23:34:46,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=3677, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 23:34:46,421 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 61 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 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) [2021-05-02 23:34:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:51,143 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2021-05-02 23:34:51,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 23:34:51,144 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 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 [2021-05-02 23:34:51,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:51,144 INFO L225 Difference]: With dead ends: 90 [2021-05-02 23:34:51,145 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 23:34:51,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2351 ImplicationChecksByTransitivity, 5068.8ms TimeCoverageRelationStatistics Valid=648, Invalid=14358, Unknown=0, NotChecked=0, Total=15006 [2021-05-02 23:34:51,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 23:34:51,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 23:34:51,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 68 states have internal predecessors, (69), 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) [2021-05-02 23:34:51,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 23:34:51,152 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2021-05-02 23:34:51,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:51,152 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 23:34:51,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 59 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) [2021-05-02 23:34:51,152 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 23:34:51,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-02 23:34:51,152 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:51,152 INFO L523 BasicCegarLoop]: trace histogram [52, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:51,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-02 23:34:51,152 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:51,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:51,153 INFO L82 PathProgramCache]: Analyzing trace with hash 186731340, now seen corresponding path program 52 times [2021-05-02 23:34:51,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:51,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255499862] [2021-05-02 23:34:51,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:51,157 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1489 v_main_~n~0_60) InVars {main_~i~0=v_main_~i~0_1489, main_~n~0=v_main_~n~0_60} OutVars{main_~i~0=v_main_~i~0_1489, main_~n~0=v_main_~n~0_60} AuxVars[] AssignedVars[] [2021-05-02 23:34:51,158 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:51,172 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:51,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:51,190 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:51,208 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:51,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:51,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:51,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:51,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:51,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:51,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:34:53,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:34:53,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255499862] [2021-05-02 23:34:53,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255499862] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:34:53,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:34:53,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-02 23:34:53,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662780317] [2021-05-02 23:34:53,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 23:34:53,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:34:53,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 23:34:53,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3799, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 23:34:53,533 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 62 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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) [2021-05-02 23:34:58,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:34:58,399 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2021-05-02 23:34:58,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 23:34:58,400 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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 [2021-05-02 23:34:58,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:34:58,401 INFO L225 Difference]: With dead ends: 91 [2021-05-02 23:34:58,401 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 23:34:58,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2422 ImplicationChecksByTransitivity, 5176.4ms TimeCoverageRelationStatistics Valid=659, Invalid=14841, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 23:34:58,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 23:34:58,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 23:34:58,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 69 states have internal predecessors, (70), 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) [2021-05-02 23:34:58,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-05-02 23:34:58,408 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 72 [2021-05-02 23:34:58,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:34:58,408 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-05-02 23:34:58,409 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 60 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) [2021-05-02 23:34:58,409 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-05-02 23:34:58,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 23:34:58,409 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:34:58,409 INFO L523 BasicCegarLoop]: trace histogram [53, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:34:58,409 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-02 23:34:58,409 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:34:58,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:34:58,410 INFO L82 PathProgramCache]: Analyzing trace with hash 120304004, now seen corresponding path program 53 times [2021-05-02 23:34:58,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:34:58,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020994357] [2021-05-02 23:34:58,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:34:58,414 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1544 v_main_~n~0_61) InVars {main_~i~0=v_main_~i~0_1544, main_~n~0=v_main_~n~0_61} OutVars{main_~i~0=v_main_~i~0_1544, main_~n~0=v_main_~n~0_61} AuxVars[] AssignedVars[] [2021-05-02 23:34:58,415 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:34:58,416 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:34:58,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:34:58,447 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:34:58,464 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:34:58,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:34:58,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:34:58,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:34:58,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:00,926 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:00,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020994357] [2021-05-02 23:35:00,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2020994357] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:00,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:00,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-02 23:35:00,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410770425] [2021-05-02 23:35:00,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 23:35:00,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:00,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 23:35:00,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=3923, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 23:35:00,927 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 63 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 61 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) [2021-05-02 23:35:06,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:06,824 INFO L93 Difference]: Finished difference Result 92 states and 95 transitions. [2021-05-02 23:35:06,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 23:35:06,825 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 61 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 73 [2021-05-02 23:35:06,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:06,826 INFO L225 Difference]: With dead ends: 92 [2021-05-02 23:35:06,826 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 23:35:06,827 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2494 ImplicationChecksByTransitivity, 5910.1ms TimeCoverageRelationStatistics Valid=670, Invalid=15332, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 23:35:06,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 23:35:06,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-02 23:35:06,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 70 states have internal predecessors, (71), 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) [2021-05-02 23:35:06,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-05-02 23:35:06,833 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 73 [2021-05-02 23:35:06,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:06,834 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-05-02 23:35:06,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 61 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) [2021-05-02 23:35:06,834 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-05-02 23:35:06,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 23:35:06,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:06,834 INFO L523 BasicCegarLoop]: trace histogram [54, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:06,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-02 23:35:06,834 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:06,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:06,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1938943412, now seen corresponding path program 54 times [2021-05-02 23:35:06,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:06,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [236721407] [2021-05-02 23:35:06,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:06,854 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1600 v_main_~n~0_62) InVars {main_~i~0=v_main_~i~0_1600, main_~n~0=v_main_~n~0_62} OutVars{main_~i~0=v_main_~i~0_1600, main_~n~0=v_main_~n~0_62} AuxVars[] AssignedVars[] [2021-05-02 23:35:06,856 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:06,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:06,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:06,893 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:06,916 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:06,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:07,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:07,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:07,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:07,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:07,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:10,060 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:10,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [236721407] [2021-05-02 23:35:10,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [236721407] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:10,060 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:10,060 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-02 23:35:10,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364006518] [2021-05-02 23:35:10,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 23:35:10,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:10,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 23:35:10,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=4049, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 23:35:10,061 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 64 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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) [2021-05-02 23:35:16,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:16,648 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-05-02 23:35:16,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 23:35:16,649 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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 [2021-05-02 23:35:16,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:16,650 INFO L225 Difference]: With dead ends: 93 [2021-05-02 23:35:16,650 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 23:35:16,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2567 ImplicationChecksByTransitivity, 6904.9ms TimeCoverageRelationStatistics Valid=681, Invalid=15831, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 23:35:16,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 23:35:16,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-02 23:35:16,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 71 states have internal predecessors, (72), 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) [2021-05-02 23:35:16,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2021-05-02 23:35:16,659 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 74 [2021-05-02 23:35:16,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:16,659 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2021-05-02 23:35:16,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 62 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) [2021-05-02 23:35:16,660 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2021-05-02 23:35:16,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 23:35:16,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:16,660 INFO L523 BasicCegarLoop]: trace histogram [55, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:16,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-02 23:35:16,660 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:16,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:16,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1351103868, now seen corresponding path program 55 times [2021-05-02 23:35:16,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:16,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [802220817] [2021-05-02 23:35:16,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:16,666 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1657 v_main_~n~0_63) InVars {main_~i~0=v_main_~i~0_1657, main_~n~0=v_main_~n~0_63} OutVars{main_~i~0=v_main_~i~0_1657, main_~n~0=v_main_~n~0_63} AuxVars[] AssignedVars[] [2021-05-02 23:35:16,667 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:16,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:16,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:16,711 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:16,739 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:16,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:16,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:16,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:16,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:16,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:16,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:20,015 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:20,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [802220817] [2021-05-02 23:35:20,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [802220817] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:20,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:20,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-02 23:35:20,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550403030] [2021-05-02 23:35:20,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 23:35:20,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:20,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 23:35:20,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=4230, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 23:35:20,017 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 65 states, 64 states have (on average 1.078125) internal successors, (69), 63 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) [2021-05-02 23:35:27,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:27,284 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2021-05-02 23:35:27,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 23:35:27,286 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.078125) internal successors, (69), 63 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 [2021-05-02 23:35:27,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:27,287 INFO L225 Difference]: With dead ends: 94 [2021-05-02 23:35:27,287 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 23:35:27,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2762 ImplicationChecksByTransitivity, 7331.0ms TimeCoverageRelationStatistics Valid=584, Invalid=16446, Unknown=0, NotChecked=0, Total=17030 [2021-05-02 23:35:27,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 23:35:27,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 23:35:27,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 71 states have (on average 1.028169014084507) internal successors, (73), 72 states have internal predecessors, (73), 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) [2021-05-02 23:35:27,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 23:35:27,296 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2021-05-02 23:35:27,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:27,296 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 23:35:27,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 64 states have (on average 1.078125) internal successors, (69), 63 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) [2021-05-02 23:35:27,296 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 23:35:27,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 23:35:27,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:27,297 INFO L523 BasicCegarLoop]: trace histogram [56, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:27,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-02 23:35:27,297 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:27,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:27,297 INFO L82 PathProgramCache]: Analyzing trace with hash -307947188, now seen corresponding path program 56 times [2021-05-02 23:35:27,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:27,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850413320] [2021-05-02 23:35:27,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:27,302 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1715 v_main_~n~0_64) InVars {main_~i~0=v_main_~i~0_1715, main_~n~0=v_main_~n~0_64} OutVars{main_~i~0=v_main_~i~0_1715, main_~n~0=v_main_~n~0_64} AuxVars[] AssignedVars[] [2021-05-02 23:35:27,305 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:27,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:27,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:27,349 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:27,375 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:27,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:27,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:27,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:27,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:27,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:27,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:30,823 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:30,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850413320] [2021-05-02 23:35:30,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [850413320] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:30,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:30,824 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-02 23:35:30,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076241460] [2021-05-02 23:35:30,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 23:35:30,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:30,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 23:35:30,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4307, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 23:35:30,825 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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) [2021-05-02 23:35:37,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:38,000 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2021-05-02 23:35:38,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 23:35:38,001 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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 76 [2021-05-02 23:35:38,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:38,002 INFO L225 Difference]: With dead ends: 95 [2021-05-02 23:35:38,002 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 23:35:38,003 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2716 ImplicationChecksByTransitivity, 7616.6ms TimeCoverageRelationStatistics Valid=703, Invalid=16853, Unknown=0, NotChecked=0, Total=17556 [2021-05-02 23:35:38,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 23:35:38,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-05-02 23:35:38,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 73 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) [2021-05-02 23:35:38,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-05-02 23:35:38,009 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2021-05-02 23:35:38,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:38,009 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-05-02 23:35:38,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 64 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) [2021-05-02 23:35:38,009 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-05-02 23:35:38,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 23:35:38,010 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:38,010 INFO L523 BasicCegarLoop]: trace histogram [57, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:38,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-02 23:35:38,010 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:38,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:38,010 INFO L82 PathProgramCache]: Analyzing trace with hash 1965138820, now seen corresponding path program 57 times [2021-05-02 23:35:38,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:38,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1249400709] [2021-05-02 23:35:38,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:38,040 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1774 v_main_~n~0_65) InVars {main_~i~0=v_main_~i~0_1774, main_~n~0=v_main_~n~0_65} OutVars{main_~i~0=v_main_~i~0_1774, main_~n~0=v_main_~n~0_65} AuxVars[] AssignedVars[] [2021-05-02 23:35:38,042 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:38,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:38,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:38,087 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:38,114 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:38,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:38,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:38,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:38,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:38,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:38,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:41,646 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:41,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1249400709] [2021-05-02 23:35:41,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1249400709] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:41,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:41,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-02 23:35:41,647 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008744393] [2021-05-02 23:35:41,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 23:35:41,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:41,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 23:35:41,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=4494, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 23:35:41,649 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 67 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 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) [2021-05-02 23:35:49,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:49,190 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2021-05-02 23:35:49,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 23:35:49,191 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 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 [2021-05-02 23:35:49,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:49,192 INFO L225 Difference]: With dead ends: 96 [2021-05-02 23:35:49,192 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 23:35:49,193 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2917 ImplicationChecksByTransitivity, 7816.1ms TimeCoverageRelationStatistics Valid=602, Invalid=17488, Unknown=0, NotChecked=0, Total=18090 [2021-05-02 23:35:49,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 23:35:49,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 23:35:49,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 74 states have internal predecessors, (75), 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) [2021-05-02 23:35:49,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2021-05-02 23:35:49,199 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 77 [2021-05-02 23:35:49,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:49,199 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2021-05-02 23:35:49,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 65 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) [2021-05-02 23:35:49,199 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2021-05-02 23:35:49,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 23:35:49,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:49,200 INFO L523 BasicCegarLoop]: trace histogram [58, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:49,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-02 23:35:49,200 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:49,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:49,200 INFO L82 PathProgramCache]: Analyzing trace with hash -583638964, now seen corresponding path program 58 times [2021-05-02 23:35:49,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:49,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60416692] [2021-05-02 23:35:49,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:49,205 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1834 v_main_~n~0_66) InVars {main_~i~0=v_main_~i~0_1834, main_~n~0=v_main_~n~0_66} OutVars{main_~i~0=v_main_~i~0_1834, main_~n~0=v_main_~n~0_66} AuxVars[] AssignedVars[] [2021-05-02 23:35:49,206 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:49,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:49,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:49,238 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:49,258 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:49,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:49,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:49,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:49,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:49,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:49,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:35:52,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:35:52,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60416692] [2021-05-02 23:35:52,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [60416692] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:35:52,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:35:52,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-02 23:35:52,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919617649] [2021-05-02 23:35:52,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 23:35:52,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:35:52,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 23:35:52,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=4629, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 23:35:52,330 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand has 68 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 states have internal predecessors, (72), 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) [2021-05-02 23:35:59,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:35:59,394 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2021-05-02 23:35:59,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-02 23:35:59,395 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 states have internal predecessors, (72), 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 [2021-05-02 23:35:59,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:35:59,396 INFO L225 Difference]: With dead ends: 97 [2021-05-02 23:35:59,396 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 23:35:59,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2996 ImplicationChecksByTransitivity, 7021.1ms TimeCoverageRelationStatistics Valid=611, Invalid=18021, Unknown=0, NotChecked=0, Total=18632 [2021-05-02 23:35:59,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 23:35:59,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 23:35:59,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 74 states have (on average 1.027027027027027) internal successors, (76), 75 states have internal predecessors, (76), 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) [2021-05-02 23:35:59,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2021-05-02 23:35:59,405 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2021-05-02 23:35:59,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:35:59,405 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2021-05-02 23:35:59,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 66 states have internal predecessors, (72), 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) [2021-05-02 23:35:59,405 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2021-05-02 23:35:59,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 23:35:59,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:35:59,405 INFO L523 BasicCegarLoop]: trace histogram [59, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:35:59,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-02 23:35:59,405 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:35:59,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:35:59,406 INFO L82 PathProgramCache]: Analyzing trace with hash 2008628356, now seen corresponding path program 59 times [2021-05-02 23:35:59,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:35:59,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867957069] [2021-05-02 23:35:59,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:35:59,410 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1895 v_main_~n~0_67) InVars {main_~i~0=v_main_~i~0_1895, main_~n~0=v_main_~n~0_67} OutVars{main_~i~0=v_main_~i~0_1895, main_~n~0=v_main_~n~0_67} AuxVars[] AssignedVars[] [2021-05-02 23:35:59,426 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:35:59,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:35:59,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:35:59,470 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:35:59,493 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:35:59,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:59,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:35:59,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:59,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:35:59,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:35:59,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:36:02,870 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:02,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867957069] [2021-05-02 23:36:02,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1867957069] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:02,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:02,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-02 23:36:02,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972894522] [2021-05-02 23:36:02,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-02 23:36:02,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:02,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-02 23:36:02,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=4709, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 23:36:02,871 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 69 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 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) [2021-05-02 23:36:10,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:10,470 INFO L93 Difference]: Finished difference Result 98 states and 101 transitions. [2021-05-02 23:36:10,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 23:36:10,470 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 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 79 [2021-05-02 23:36:10,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:10,471 INFO L225 Difference]: With dead ends: 98 [2021-05-02 23:36:10,471 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 23:36:10,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2947 ImplicationChecksByTransitivity, 7676.0ms TimeCoverageRelationStatistics Valid=736, Invalid=18446, Unknown=0, NotChecked=0, Total=19182 [2021-05-02 23:36:10,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 23:36:10,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 23:36:10,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 76 states have internal predecessors, (77), 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) [2021-05-02 23:36:10,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 23:36:10,479 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2021-05-02 23:36:10,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:10,479 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 23:36:10,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 67 states have internal predecessors, (73), 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) [2021-05-02 23:36:10,479 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 23:36:10,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 23:36:10,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:10,479 INFO L523 BasicCegarLoop]: trace histogram [60, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:10,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-02 23:36:10,479 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:10,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:10,480 INFO L82 PathProgramCache]: Analyzing trace with hash 764536652, now seen corresponding path program 60 times [2021-05-02 23:36:10,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:10,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172315285] [2021-05-02 23:36:10,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:10,485 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_1957 v_main_~n~0_68) InVars {main_~i~0=v_main_~i~0_1957, main_~n~0=v_main_~n~0_68} OutVars{main_~i~0=v_main_~i~0_1957, main_~n~0=v_main_~n~0_68} AuxVars[] AssignedVars[] [2021-05-02 23:36:10,486 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:10,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:10,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:10,531 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:10,558 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:10,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:10,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:10,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:10,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:10,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:36:14,271 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:14,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172315285] [2021-05-02 23:36:14,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [172315285] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:14,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:14,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-02 23:36:14,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696978998] [2021-05-02 23:36:14,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 23:36:14,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:14,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 23:36:14,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=4847, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 23:36:14,272 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 states have internal predecessors, (74), 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) [2021-05-02 23:36:24,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:24,367 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2021-05-02 23:36:24,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-02 23:36:24,370 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 states have internal predecessors, (74), 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 80 [2021-05-02 23:36:24,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:24,371 INFO L225 Difference]: With dead ends: 99 [2021-05-02 23:36:24,371 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 23:36:24,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3026 ImplicationChecksByTransitivity, 9066.2ms TimeCoverageRelationStatistics Valid=747, Invalid=18993, Unknown=0, NotChecked=0, Total=19740 [2021-05-02 23:36:24,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 23:36:24,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2021-05-02 23:36:24,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 77 states have internal predecessors, (78), 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) [2021-05-02 23:36:24,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2021-05-02 23:36:24,378 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 80 [2021-05-02 23:36:24,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:24,379 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2021-05-02 23:36:24,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 69 states have (on average 1.0724637681159421) internal successors, (74), 68 states have internal predecessors, (74), 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) [2021-05-02 23:36:24,379 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2021-05-02 23:36:24,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 23:36:24,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:24,379 INFO L523 BasicCegarLoop]: trace histogram [61, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:24,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-02 23:36:24,379 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:24,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:24,380 INFO L82 PathProgramCache]: Analyzing trace with hash 852399492, now seen corresponding path program 61 times [2021-05-02 23:36:24,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:24,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270150316] [2021-05-02 23:36:24,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:24,385 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2020 v_main_~n~0_69) InVars {main_~i~0=v_main_~i~0_2020, main_~n~0=v_main_~n~0_69} OutVars{main_~i~0=v_main_~i~0_2020, main_~n~0=v_main_~n~0_69} AuxVars[] AssignedVars[] [2021-05-02 23:36:24,387 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:24,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:24,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:24,460 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:24,503 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:24,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:24,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:24,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:24,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:24,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:24,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:36:28,614 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:28,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270150316] [2021-05-02 23:36:28,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270150316] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:28,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:28,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-02 23:36:28,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418926156] [2021-05-02 23:36:28,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-02 23:36:28,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:28,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-02 23:36:28,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5046, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 23:36:28,616 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 71 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 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) [2021-05-02 23:36:37,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:37,441 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2021-05-02 23:36:37,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 23:36:37,443 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 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 81 [2021-05-02 23:36:37,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:37,446 INFO L225 Difference]: With dead ends: 100 [2021-05-02 23:36:37,446 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 23:36:37,447 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 8866.9ms TimeCoverageRelationStatistics Valid=638, Invalid=19668, Unknown=0, NotChecked=0, Total=20306 [2021-05-02 23:36:37,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 23:36:37,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 23:36:37,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 77 states have (on average 1.025974025974026) internal successors, (79), 78 states have internal predecessors, (79), 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) [2021-05-02 23:36:37,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2021-05-02 23:36:37,457 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 81 [2021-05-02 23:36:37,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:37,457 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2021-05-02 23:36:37,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 70 states have (on average 1.0714285714285714) internal successors, (75), 69 states have internal predecessors, (75), 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) [2021-05-02 23:36:37,457 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2021-05-02 23:36:37,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 23:36:37,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:37,458 INFO L523 BasicCegarLoop]: trace histogram [62, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:37,458 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-02 23:36:37,458 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:37,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:37,458 INFO L82 PathProgramCache]: Analyzing trace with hash -718819764, now seen corresponding path program 62 times [2021-05-02 23:36:37,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:37,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329107557] [2021-05-02 23:36:37,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:37,465 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2084 v_main_~n~0_70) InVars {main_~i~0=v_main_~i~0_2084, main_~n~0=v_main_~n~0_70} OutVars{main_~i~0=v_main_~i~0_2084, main_~n~0=v_main_~n~0_70} AuxVars[] AssignedVars[] [2021-05-02 23:36:37,466 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:37,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:37,474 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:37,503 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:37,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:37,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:37,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:37,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:37,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:37,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:37,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:36:44,820 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:36:44,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329107557] [2021-05-02 23:36:44,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [329107557] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:36:44,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:36:44,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-02 23:36:44,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401934386] [2021-05-02 23:36:44,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-02 23:36:44,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:36:44,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-02 23:36:44,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=5189, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 23:36:44,823 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 72 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 states have internal predecessors, (76), 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) [2021-05-02 23:36:54,681 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:36:55,464 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2021-05-02 23:36:56,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:36:56,484 INFO L93 Difference]: Finished difference Result 101 states and 104 transitions. [2021-05-02 23:36:56,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-02 23:36:56,489 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 states have internal predecessors, (76), 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 82 [2021-05-02 23:36:56,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:36:56,492 INFO L225 Difference]: With dead ends: 101 [2021-05-02 23:36:56,492 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 23:36:56,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3322 ImplicationChecksByTransitivity, 13607.5ms TimeCoverageRelationStatistics Valid=647, Invalid=20233, Unknown=0, NotChecked=0, Total=20880 [2021-05-02 23:36:56,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 23:36:56,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-02 23:36:56,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 79 states have internal predecessors, (80), 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) [2021-05-02 23:36:56,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-05-02 23:36:56,510 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 82 [2021-05-02 23:36:56,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:36:56,510 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-05-02 23:36:56,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 70 states have internal predecessors, (76), 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) [2021-05-02 23:36:56,510 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-05-02 23:36:56,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 23:36:56,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:36:56,511 INFO L523 BasicCegarLoop]: trace histogram [63, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:36:56,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-02 23:36:56,511 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:36:56,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:36:56,511 INFO L82 PathProgramCache]: Analyzing trace with hash 2112990852, now seen corresponding path program 63 times [2021-05-02 23:36:56,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:36:56,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686423712] [2021-05-02 23:36:56,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:36:56,522 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2149 v_main_~n~0_71) InVars {main_~i~0=v_main_~i~0_2149, main_~n~0=v_main_~n~0_71} OutVars{main_~i~0=v_main_~i~0_2149, main_~n~0=v_main_~n~0_71} AuxVars[] AssignedVars[] [2021-05-02 23:36:56,531 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:36:56,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:36:56,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:36:56,604 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:36:56,665 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:36:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:56,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:36:56,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:56,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:36:56,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:36:56,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:37:01,796 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:01,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686423712] [2021-05-02 23:37:01,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1686423712] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:01,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:01,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-02 23:37:01,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829521343] [2021-05-02 23:37:01,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 23:37:01,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:01,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 23:37:01,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=5273, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 23:37:01,798 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 73 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 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) [2021-05-02 23:37:14,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:14,909 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-05-02 23:37:14,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 23:37:14,911 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 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 83 [2021-05-02 23:37:14,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:14,912 INFO L225 Difference]: With dead ends: 102 [2021-05-02 23:37:14,912 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 23:37:14,913 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3269 ImplicationChecksByTransitivity, 11853.1ms TimeCoverageRelationStatistics Valid=780, Invalid=20682, Unknown=0, NotChecked=0, Total=21462 [2021-05-02 23:37:14,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 23:37:14,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 23:37:14,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 80 states have internal predecessors, (81), 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) [2021-05-02 23:37:14,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 23:37:14,942 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2021-05-02 23:37:14,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:14,942 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 23:37:14,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 72 states have (on average 1.0694444444444444) internal successors, (77), 71 states have internal predecessors, (77), 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) [2021-05-02 23:37:14,943 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 23:37:14,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 23:37:14,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:14,943 INFO L523 BasicCegarLoop]: trace histogram [64, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:37:14,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-02 23:37:14,943 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:14,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:14,944 INFO L82 PathProgramCache]: Analyzing trace with hash -295193268, now seen corresponding path program 64 times [2021-05-02 23:37:14,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:14,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453267509] [2021-05-02 23:37:14,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:14,950 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2215 v_main_~n~0_72) InVars {main_~i~0=v_main_~i~0_2215, main_~n~0=v_main_~n~0_72} OutVars{main_~i~0=v_main_~i~0_2215, main_~n~0=v_main_~n~0_72} AuxVars[] AssignedVars[] [2021-05-02 23:37:14,952 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:37:14,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:14,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:37:14,999 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:37:15,032 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:15,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:15,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:15,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:15,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:37:15,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:15,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:37:22,107 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:22,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453267509] [2021-05-02 23:37:22,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1453267509] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:22,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:22,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-02 23:37:22,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082631283] [2021-05-02 23:37:22,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 23:37:22,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:22,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 23:37:22,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=5481, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 23:37:22,109 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 74 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 states have internal predecessors, (78), 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) [2021-05-02 23:37:34,974 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:37:35,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:37:35,720 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2021-05-02 23:37:35,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-02 23:37:35,721 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 states have internal predecessors, (78), 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 84 [2021-05-02 23:37:35,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:37:35,722 INFO L225 Difference]: With dead ends: 103 [2021-05-02 23:37:35,722 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 23:37:35,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3491 ImplicationChecksByTransitivity, 14113.8ms TimeCoverageRelationStatistics Valid=665, Invalid=21387, Unknown=0, NotChecked=0, Total=22052 [2021-05-02 23:37:35,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 23:37:35,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 23:37:35,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 80 states have (on average 1.025) internal successors, (82), 81 states have internal predecessors, (82), 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) [2021-05-02 23:37:35,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-05-02 23:37:35,732 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2021-05-02 23:37:35,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:37:35,732 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-05-02 23:37:35,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 72 states have internal predecessors, (78), 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) [2021-05-02 23:37:35,732 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-05-02 23:37:35,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 23:37:35,737 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:37:35,738 INFO L523 BasicCegarLoop]: trace histogram [65, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:37:35,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-02 23:37:35,738 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:37:35,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:37:35,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1934456956, now seen corresponding path program 65 times [2021-05-02 23:37:35,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:37:35,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764302998] [2021-05-02 23:37:35,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:37:35,750 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2282 v_main_~n~0_73) InVars {main_~i~0=v_main_~i~0_2282, main_~n~0=v_main_~n~0_73} OutVars{main_~i~0=v_main_~i~0_2282, main_~n~0=v_main_~n~0_73} AuxVars[] AssignedVars[] [2021-05-02 23:37:35,764 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:37:35,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:37:35,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:37:35,874 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:37:35,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:37:35,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:36,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:37:36,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:36,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:37:36,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:37:36,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:37:42,980 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:37:42,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764302998] [2021-05-02 23:37:42,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1764302998] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:37:42,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:37:42,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-02 23:37:42,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153543896] [2021-05-02 23:37:42,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 23:37:42,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:37:42,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 23:37:42,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=5567, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 23:37:42,982 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 73 states have internal predecessors, (79), 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) [2021-05-02 23:37:59,478 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-05-02 23:38:00,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:38:00,352 INFO L93 Difference]: Finished difference Result 104 states and 107 transitions. [2021-05-02 23:38:00,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 23:38:00,356 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 73 states have internal predecessors, (79), 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 85 [2021-05-02 23:38:00,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:38:00,357 INFO L225 Difference]: With dead ends: 104 [2021-05-02 23:38:00,357 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 23:38:00,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3436 ImplicationChecksByTransitivity, 16023.3ms TimeCoverageRelationStatistics Valid=802, Invalid=21848, Unknown=0, NotChecked=0, Total=22650 [2021-05-02 23:38:00,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 23:38:00,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-02 23:38:00,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 82 states have internal predecessors, (83), 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) [2021-05-02 23:38:00,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2021-05-02 23:38:00,372 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 85 [2021-05-02 23:38:00,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:38:00,372 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2021-05-02 23:38:00,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 74 states have (on average 1.0675675675675675) internal successors, (79), 73 states have internal predecessors, (79), 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) [2021-05-02 23:38:00,373 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2021-05-02 23:38:00,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 23:38:00,373 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:38:00,373 INFO L523 BasicCegarLoop]: trace histogram [66, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:38:00,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-02 23:38:00,373 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:38:00,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:38:00,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1212023732, now seen corresponding path program 66 times [2021-05-02 23:38:00,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:38:00,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648018026] [2021-05-02 23:38:00,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:38:00,381 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2350 v_main_~n~0_74) InVars {main_~i~0=v_main_~i~0_2350, main_~n~0=v_main_~n~0_74} OutVars{main_~i~0=v_main_~i~0_2350, main_~n~0=v_main_~n~0_74} AuxVars[] AssignedVars[] [2021-05-02 23:38:00,404 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:38:00,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:38:00,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:38:00,490 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:38:00,593 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-02 23:38:00,600 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:38:00,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:00,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:38:00,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:00,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:38:00,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:01,004 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:38:09,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:09,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648018026] [2021-05-02 23:38:09,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [648018026] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:09,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:09,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-02 23:38:09,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489816944] [2021-05-02 23:38:09,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 23:38:09,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:09,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 23:38:09,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5717, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 23:38:09,855 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 states have internal predecessors, (80), 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) [2021-05-02 23:38:31,404 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2021-05-02 23:38:32,234 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 38 [2021-05-02 23:38:32,951 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2021-05-02 23:38:33,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:38:33,598 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2021-05-02 23:38:33,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-02 23:38:33,609 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 states have internal predecessors, (80), 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 86 [2021-05-02 23:38:33,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:38:33,610 INFO L225 Difference]: With dead ends: 105 [2021-05-02 23:38:33,610 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 23:38:33,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3521 ImplicationChecksByTransitivity, 20777.7ms TimeCoverageRelationStatistics Valid=813, Invalid=22443, Unknown=0, NotChecked=0, Total=23256 [2021-05-02 23:38:33,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 23:38:33,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-02 23:38:33,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 82 states have (on average 1.024390243902439) internal successors, (84), 83 states have internal predecessors, (84), 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) [2021-05-02 23:38:33,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2021-05-02 23:38:33,621 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 86 [2021-05-02 23:38:33,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:38:33,621 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2021-05-02 23:38:33,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 74 states have internal predecessors, (80), 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) [2021-05-02 23:38:33,621 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2021-05-02 23:38:33,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 23:38:33,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:38:33,621 INFO L523 BasicCegarLoop]: trace histogram [67, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:38:33,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-02 23:38:33,622 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:38:33,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:38:33,622 INFO L82 PathProgramCache]: Analyzing trace with hash -291430268, now seen corresponding path program 67 times [2021-05-02 23:38:33,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:38:33,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639331454] [2021-05-02 23:38:33,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:38:33,646 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2419 v_main_~n~0_75) InVars {main_~i~0=v_main_~i~0_2419, main_~n~0=v_main_~n~0_75} OutVars{main_~i~0=v_main_~i~0_2419, main_~n~0=v_main_~n~0_75} AuxVars[] AssignedVars[] [2021-05-02 23:38:33,649 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:38:33,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:38:33,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:38:33,726 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:38:33,788 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:38:33,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:34,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:38:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:34,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:38:34,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:38:34,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:38:34,382 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:38:43,828 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:38:43,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639331454] [2021-05-02 23:38:43,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [639331454] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:38:43,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:38:43,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-02 23:38:43,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683941720] [2021-05-02 23:38:43,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-02 23:38:43,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:38:43,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-02 23:38:43,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=5869, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 23:38:43,830 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 77 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 75 states have internal predecessors, (81), 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) [2021-05-02 23:39:02,259 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:39:02,780 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2021-05-02 23:39:03,845 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2021-05-02 23:39:04,316 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-02 23:39:05,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:05,184 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2021-05-02 23:39:05,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-02 23:39:05,191 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 75 states have internal predecessors, (81), 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 87 [2021-05-02 23:39:05,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:05,192 INFO L225 Difference]: With dead ends: 106 [2021-05-02 23:39:05,192 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 23:39:05,194 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3607 ImplicationChecksByTransitivity, 19871.0ms TimeCoverageRelationStatistics Valid=824, Invalid=23046, Unknown=0, NotChecked=0, Total=23870 [2021-05-02 23:39:05,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 23:39:05,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 23:39:05,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 84 states have internal predecessors, (85), 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) [2021-05-02 23:39:05,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-05-02 23:39:05,205 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2021-05-02 23:39:05,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:05,205 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-05-02 23:39:05,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 75 states have internal predecessors, (81), 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) [2021-05-02 23:39:05,205 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-05-02 23:39:05,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-02 23:39:05,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:05,206 INFO L523 BasicCegarLoop]: trace histogram [68, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:39:05,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-02 23:39:05,206 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:05,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:05,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1817803956, now seen corresponding path program 68 times [2021-05-02 23:39:05,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:05,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1203633044] [2021-05-02 23:39:05,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:05,219 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2489 v_main_~n~0_76) InVars {main_~i~0=v_main_~i~0_2489, main_~n~0=v_main_~n~0_76} OutVars{main_~i~0=v_main_~i~0_2489, main_~n~0=v_main_~n~0_76} AuxVars[] AssignedVars[] [2021-05-02 23:39:05,225 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:39:05,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:05,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:39:05,300 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:39:05,334 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:05,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:05,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:39:05,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:05,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:39:05,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:05,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:39:05,989 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:39:16,682 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:39:16,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1203633044] [2021-05-02 23:39:16,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1203633044] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:39:16,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:39:16,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-02 23:39:16,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446870264] [2021-05-02 23:39:16,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-02 23:39:16,683 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:39:16,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-02 23:39:16,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=6023, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 23:39:16,684 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 78 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 76 states have internal predecessors, (82), 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) [2021-05-02 23:39:35,925 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 36 [2021-05-02 23:39:36,733 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:39:38,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:39:38,856 INFO L93 Difference]: Finished difference Result 107 states and 110 transitions. [2021-05-02 23:39:38,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-02 23:39:38,858 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 76 states have internal predecessors, (82), 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 88 [2021-05-02 23:39:38,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:39:38,859 INFO L225 Difference]: With dead ends: 107 [2021-05-02 23:39:38,859 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 23:39:38,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3694 ImplicationChecksByTransitivity, 21402.0ms TimeCoverageRelationStatistics Valid=835, Invalid=23657, Unknown=0, NotChecked=0, Total=24492 [2021-05-02 23:39:38,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 23:39:38,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-02 23:39:38,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 84 states have (on average 1.0238095238095237) internal successors, (86), 85 states have internal predecessors, (86), 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) [2021-05-02 23:39:38,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2021-05-02 23:39:38,868 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 88 [2021-05-02 23:39:38,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:39:38,869 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2021-05-02 23:39:38,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 76 states have internal predecessors, (82), 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) [2021-05-02 23:39:38,869 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2021-05-02 23:39:38,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 23:39:38,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:39:38,869 INFO L523 BasicCegarLoop]: trace histogram [69, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:39:38,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-02 23:39:38,869 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:39:38,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:39:38,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1890748028, now seen corresponding path program 69 times [2021-05-02 23:39:38,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:39:38,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956413609] [2021-05-02 23:39:38,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:39:38,879 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2560 v_main_~n~0_77) InVars {main_~i~0=v_main_~i~0_2560, main_~n~0=v_main_~n~0_77} OutVars{main_~i~0=v_main_~i~0_2560, main_~n~0=v_main_~n~0_77} AuxVars[] AssignedVars[] [2021-05-02 23:39:38,882 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:39:38,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:39:38,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:39:38,954 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:39:39,007 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:39:39,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:39,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:39:39,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:39,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:39:39,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:39:39,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:39:46,532 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:39:46,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956413609] [2021-05-02 23:39:46,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1956413609] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:39:46,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:39:46,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-02 23:39:46,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930210272] [2021-05-02 23:39:46,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-02 23:39:46,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:39:46,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-02 23:39:46,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=6246, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 23:39:46,534 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 79 states, 78 states have (on average 1.064102564102564) internal successors, (83), 77 states have internal predecessors, (83), 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) [2021-05-02 23:40:06,310 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 36 [2021-05-02 23:40:06,909 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 39 [2021-05-02 23:40:08,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:40:08,287 INFO L93 Difference]: Finished difference Result 108 states and 111 transitions. [2021-05-02 23:40:08,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-02 23:40:08,289 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 1.064102564102564) internal successors, (83), 77 states have internal predecessors, (83), 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 89 [2021-05-02 23:40:08,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:40:08,290 INFO L225 Difference]: With dead ends: 108 [2021-05-02 23:40:08,290 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:40:08,291 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3931 ImplicationChecksByTransitivity, 17559.3ms TimeCoverageRelationStatistics Valid=710, Invalid=24412, Unknown=0, NotChecked=0, Total=25122 [2021-05-02 23:40:08,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:40:08,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 23:40:08,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 86 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) [2021-05-02 23:40:08,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2021-05-02 23:40:08,299 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 89 [2021-05-02 23:40:08,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:40:08,300 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2021-05-02 23:40:08,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 78 states have (on average 1.064102564102564) internal successors, (83), 77 states have internal predecessors, (83), 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) [2021-05-02 23:40:08,300 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2021-05-02 23:40:08,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 23:40:08,300 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:40:08,300 INFO L523 BasicCegarLoop]: trace histogram [70, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:40:08,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-02 23:40:08,300 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:40:08,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:40:08,301 INFO L82 PathProgramCache]: Analyzing trace with hash 142953036, now seen corresponding path program 70 times [2021-05-02 23:40:08,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:40:08,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584190283] [2021-05-02 23:40:08,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:40:08,307 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2632 v_main_~n~0_78) InVars {main_~i~0=v_main_~i~0_2632, main_~n~0=v_main_~n~0_78} OutVars{main_~i~0=v_main_~i~0_2632, main_~n~0=v_main_~n~0_78} AuxVars[] AssignedVars[] [2021-05-02 23:40:08,309 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:40:08,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:40:08,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:40:08,366 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:40:08,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:40:08,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:08,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:08,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:08,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:40:08,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:08,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:40:16,399 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:40:16,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584190283] [2021-05-02 23:40:16,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1584190283] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:40:16,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:40:16,400 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-02 23:40:16,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72677927] [2021-05-02 23:40:16,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-02 23:40:16,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:40:16,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-02 23:40:16,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=6337, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 23:40:16,401 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 78 states have internal predecessors, (84), 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) [2021-05-02 23:40:36,944 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 34 [2021-05-02 23:40:37,655 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-05-02 23:40:39,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:40:39,140 INFO L93 Difference]: Finished difference Result 109 states and 112 transitions. [2021-05-02 23:40:39,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-02 23:40:39,142 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 78 states have internal predecessors, (84), 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 90 [2021-05-02 23:40:39,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:40:39,143 INFO L225 Difference]: With dead ends: 109 [2021-05-02 23:40:39,143 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 23:40:39,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3871 ImplicationChecksByTransitivity, 18476.8ms TimeCoverageRelationStatistics Valid=857, Invalid=24903, Unknown=0, NotChecked=0, Total=25760 [2021-05-02 23:40:39,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 23:40:39,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 23:40:39,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 87 states have internal predecessors, (88), 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) [2021-05-02 23:40:39,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2021-05-02 23:40:39,154 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2021-05-02 23:40:39,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:40:39,154 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2021-05-02 23:40:39,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 79 states have (on average 1.0632911392405062) internal successors, (84), 78 states have internal predecessors, (84), 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) [2021-05-02 23:40:39,154 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2021-05-02 23:40:39,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 23:40:39,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:40:39,155 INFO L523 BasicCegarLoop]: trace histogram [71, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:40:39,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-02 23:40:39,155 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:40:39,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:40:39,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1236823420, now seen corresponding path program 71 times [2021-05-02 23:40:39,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:40:39,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602691635] [2021-05-02 23:40:39,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:40:39,164 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2705 v_main_~n~0_79) InVars {main_~i~0=v_main_~i~0_2705, main_~n~0=v_main_~n~0_79} OutVars{main_~i~0=v_main_~i~0_2705, main_~n~0=v_main_~n~0_79} AuxVars[] AssignedVars[] [2021-05-02 23:40:39,166 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:40:39,188 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:40:39,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:40:39,216 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:40:39,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:40:39,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:39,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:40:39,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:39,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:40:39,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:40:39,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:40:50,771 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:40:50,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602691635] [2021-05-02 23:40:50,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1602691635] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:40:50,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:40:50,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-02 23:40:50,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256614836] [2021-05-02 23:40:50,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-02 23:40:50,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:40:50,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-02 23:40:50,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=6497, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 23:40:50,773 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 81 states, 80 states have (on average 1.0625) internal successors, (85), 79 states have internal predecessors, (85), 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) [2021-05-02 23:40:58,674 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2021-05-02 23:41:17,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:41:17,916 INFO L93 Difference]: Finished difference Result 110 states and 113 transitions. [2021-05-02 23:41:17,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-02 23:41:17,920 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.0625) internal successors, (85), 79 states have internal predecessors, (85), 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 91 [2021-05-02 23:41:17,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:41:17,920 INFO L225 Difference]: With dead ends: 110 [2021-05-02 23:41:17,921 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 23:41:17,922 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3961 ImplicationChecksByTransitivity, 24145.7ms TimeCoverageRelationStatistics Valid=868, Invalid=25538, Unknown=0, NotChecked=0, Total=26406 [2021-05-02 23:41:17,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 23:41:17,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-05-02 23:41:17,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 88 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) [2021-05-02 23:41:17,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-05-02 23:41:17,931 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 91 [2021-05-02 23:41:17,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:41:17,931 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-05-02 23:41:17,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 80 states have (on average 1.0625) internal successors, (85), 79 states have internal predecessors, (85), 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) [2021-05-02 23:41:17,931 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-05-02 23:41:17,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 23:41:17,932 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:41:17,932 INFO L523 BasicCegarLoop]: trace histogram [72, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:41:17,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-02 23:41:17,932 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:41:17,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:41:17,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1060220596, now seen corresponding path program 72 times [2021-05-02 23:41:17,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:41:17,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286197334] [2021-05-02 23:41:17,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:41:17,940 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2779 v_main_~n~0_80) InVars {main_~i~0=v_main_~i~0_2779, main_~n~0=v_main_~n~0_80} OutVars{main_~i~0=v_main_~i~0_2779, main_~n~0=v_main_~n~0_80} AuxVars[] AssignedVars[] [2021-05-02 23:41:17,942 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:41:17,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:41:17,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:41:17,991 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:41:18,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:41:18,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:18,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:41:18,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:18,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:41:18,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:18,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:41:29,959 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:41:29,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286197334] [2021-05-02 23:41:29,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1286197334] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:41:29,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:41:29,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-02 23:41:29,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719792743] [2021-05-02 23:41:29,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-02 23:41:29,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:41:29,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-02 23:41:29,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=6659, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 23:41:29,961 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 82 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 80 states have internal predecessors, (86), 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) [2021-05-02 23:41:51,855 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:41:52,916 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2021-05-02 23:41:54,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:41:54,111 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2021-05-02 23:41:54,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-02 23:41:54,114 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 80 states have internal predecessors, (86), 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 92 [2021-05-02 23:41:54,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:41:54,115 INFO L225 Difference]: With dead ends: 111 [2021-05-02 23:41:54,115 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 23:41:54,116 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4052 ImplicationChecksByTransitivity, 23287.0ms TimeCoverageRelationStatistics Valid=879, Invalid=26181, Unknown=0, NotChecked=0, Total=27060 [2021-05-02 23:41:54,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 23:41:54,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-05-02 23:41:54,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 89 states have internal predecessors, (90), 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) [2021-05-02 23:41:54,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2021-05-02 23:41:54,125 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2021-05-02 23:41:54,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:41:54,125 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2021-05-02 23:41:54,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 80 states have internal predecessors, (86), 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) [2021-05-02 23:41:54,125 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2021-05-02 23:41:54,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 23:41:54,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:41:54,126 INFO L523 BasicCegarLoop]: trace histogram [73, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:41:54,126 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-02 23:41:54,126 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:41:54,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:41:54,126 INFO L82 PathProgramCache]: Analyzing trace with hash 119499652, now seen corresponding path program 73 times [2021-05-02 23:41:54,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:41:54,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522208173] [2021-05-02 23:41:54,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:41:54,133 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2854 v_main_~n~0_81) InVars {main_~i~0=v_main_~i~0_2854, main_~n~0=v_main_~n~0_81} OutVars{main_~i~0=v_main_~i~0_2854, main_~n~0=v_main_~n~0_81} AuxVars[] AssignedVars[] [2021-05-02 23:41:54,135 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:41:54,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:41:54,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:41:54,219 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:41:54,297 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:41:54,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:54,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:41:54,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:54,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:41:54,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:41:54,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:41:54,664 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:42:04,898 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:42:04,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522208173] [2021-05-02 23:42:04,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [522208173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:42:04,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:42:04,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-02 23:42:04,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125941557] [2021-05-02 23:42:04,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-02 23:42:04,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:42:04,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-02 23:42:04,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=6894, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 23:42:04,900 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 83 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 81 states have internal predecessors, (87), 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) [2021-05-02 23:42:05,074 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:42:31,407 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:42:32,294 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2021-05-02 23:42:33,026 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2021-05-02 23:42:33,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:42:33,613 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2021-05-02 23:42:33,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-02 23:42:33,618 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 81 states have internal predecessors, (87), 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 93 [2021-05-02 23:42:33,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:42:33,619 INFO L225 Difference]: With dead ends: 112 [2021-05-02 23:42:33,619 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 23:42:33,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4301 ImplicationChecksByTransitivity, 23977.8ms TimeCoverageRelationStatistics Valid=746, Invalid=26976, Unknown=0, NotChecked=0, Total=27722 [2021-05-02 23:42:33,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 23:42:33,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 23:42:33,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 90 states have internal predecessors, (91), 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) [2021-05-02 23:42:33,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2021-05-02 23:42:33,629 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2021-05-02 23:42:33,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:42:33,629 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2021-05-02 23:42:33,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 82 states have (on average 1.0609756097560976) internal successors, (87), 81 states have internal predecessors, (87), 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) [2021-05-02 23:42:33,629 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2021-05-02 23:42:33,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 23:42:33,629 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:42:33,630 INFO L523 BasicCegarLoop]: trace histogram [74, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:42:33,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-02 23:42:33,630 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:42:33,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:42:33,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1963878324, now seen corresponding path program 74 times [2021-05-02 23:42:33,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:42:33,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429753243] [2021-05-02 23:42:33,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:42:33,640 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_2930 v_main_~n~0_82) InVars {main_~i~0=v_main_~i~0_2930, main_~n~0=v_main_~n~0_82} OutVars{main_~i~0=v_main_~i~0_2930, main_~n~0=v_main_~n~0_82} AuxVars[] AssignedVars[] [2021-05-02 23:42:33,642 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:42:33,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:42:33,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:42:33,707 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:42:33,786 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:42:33,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:34,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:42:34,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:34,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:42:34,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:42:34,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:42:45,988 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:42:45,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429753243] [2021-05-02 23:42:45,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [429753243] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:42:45,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:42:45,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-02 23:42:45,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220566244] [2021-05-02 23:42:45,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-02 23:42:45,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:42:45,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-02 23:42:45,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=7061, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 23:42:45,990 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 84 states, 83 states have (on average 1.0602409638554218) internal successors, (88), 82 states have internal predecessors, (88), 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) [2021-05-02 23:42:46,374 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:43:18,802 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 35 [2021-05-02 23:43:20,218 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2021-05-02 23:43:22,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:43:22,188 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2021-05-02 23:43:22,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-02 23:43:22,193 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.0602409638554218) internal successors, (88), 82 states have internal predecessors, (88), 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 94 [2021-05-02 23:43:22,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:43:22,193 INFO L225 Difference]: With dead ends: 113 [2021-05-02 23:43:22,193 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 23:43:22,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4396 ImplicationChecksByTransitivity, 28639.0ms TimeCoverageRelationStatistics Valid=755, Invalid=27637, Unknown=0, NotChecked=0, Total=28392 [2021-05-02 23:43:22,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 23:43:22,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-05-02 23:43:22,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 91 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) [2021-05-02 23:43:22,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-05-02 23:43:22,204 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 94 [2021-05-02 23:43:22,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:43:22,204 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-05-02 23:43:22,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 83 states have (on average 1.0602409638554218) internal successors, (88), 82 states have internal predecessors, (88), 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) [2021-05-02 23:43:22,204 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-05-02 23:43:22,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 23:43:22,204 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:43:22,204 INFO L523 BasicCegarLoop]: trace histogram [75, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:43:22,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-02 23:43:22,205 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:43:22,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:43:22,205 INFO L82 PathProgramCache]: Analyzing trace with hash -2124086140, now seen corresponding path program 75 times [2021-05-02 23:43:22,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:43:22,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757041428] [2021-05-02 23:43:22,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:43:22,215 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3007 v_main_~n~0_83) InVars {main_~i~0=v_main_~i~0_3007, main_~n~0=v_main_~n~0_83} OutVars{main_~i~0=v_main_~i~0_3007, main_~n~0=v_main_~n~0_83} AuxVars[] AssignedVars[] [2021-05-02 23:43:22,218 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:43:22,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:43:22,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:43:22,288 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:43:22,356 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:43:22,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:22,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:43:22,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:22,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:43:22,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:43:22,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:43:36,512 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:43:36,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757041428] [2021-05-02 23:43:36,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1757041428] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:43:36,513 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:43:36,513 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-02 23:43:36,513 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607637347] [2021-05-02 23:43:36,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-02 23:43:36,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:43:36,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-02 23:43:36,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=7157, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 23:43:36,514 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 83 states have internal predecessors, (89), 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) [2021-05-02 23:43:36,692 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:44:10,052 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2021-05-02 23:44:11,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:44:11,763 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-05-02 23:44:11,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-02 23:44:11,768 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 83 states have internal predecessors, (89), 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 95 [2021-05-02 23:44:11,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:44:11,768 INFO L225 Difference]: With dead ends: 114 [2021-05-02 23:44:11,768 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 23:44:11,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4331 ImplicationChecksByTransitivity, 29587.0ms TimeCoverageRelationStatistics Valid=912, Invalid=28158, Unknown=0, NotChecked=0, Total=29070 [2021-05-02 23:44:11,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 23:44:11,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-05-02 23:44:11,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 91 states have (on average 1.021978021978022) internal successors, (93), 92 states have internal predecessors, (93), 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) [2021-05-02 23:44:11,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-05-02 23:44:11,778 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2021-05-02 23:44:11,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:44:11,778 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-05-02 23:44:11,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 83 states have internal predecessors, (89), 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) [2021-05-02 23:44:11,779 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-05-02 23:44:11,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-02 23:44:11,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:44:11,779 INFO L523 BasicCegarLoop]: trace histogram [76, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:44:11,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-02 23:44:11,779 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:44:11,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:44:11,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1499406156, now seen corresponding path program 76 times [2021-05-02 23:44:11,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:44:11,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318079105] [2021-05-02 23:44:11,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:44:11,787 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3085 v_main_~n~0_84) InVars {main_~i~0=v_main_~i~0_3085, main_~n~0=v_main_~n~0_84} OutVars{main_~i~0=v_main_~i~0_3085, main_~n~0=v_main_~n~0_84} AuxVars[] AssignedVars[] [2021-05-02 23:44:11,789 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:44:11,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:44:11,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:44:11,872 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:44:11,940 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:44:11,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:12,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:44:12,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:12,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:44:12,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:44:12,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:44:12,498 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:44:26,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:44:26,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318079105] [2021-05-02 23:44:26,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1318079105] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:44:26,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:44:26,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-02 23:44:26,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406745449] [2021-05-02 23:44:26,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-02 23:44:26,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:44:26,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-02 23:44:26,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=7327, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 23:44:26,543 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 84 states have internal predecessors, (90), 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) [2021-05-02 23:44:57,808 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 34 [2021-05-02 23:44:58,868 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-05-02 23:44:59,691 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2021-05-02 23:45:00,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:00,487 INFO L93 Difference]: Finished difference Result 115 states and 118 transitions. [2021-05-02 23:45:00,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-02 23:45:00,494 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 84 states have internal predecessors, (90), 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 96 [2021-05-02 23:45:00,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:00,494 INFO L225 Difference]: With dead ends: 115 [2021-05-02 23:45:00,495 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 23:45:00,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 29539.8ms TimeCoverageRelationStatistics Valid=923, Invalid=28833, Unknown=0, NotChecked=0, Total=29756 [2021-05-02 23:45:00,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 23:45:00,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-02 23:45:00,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 93 states have internal predecessors, (94), 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) [2021-05-02 23:45:00,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2021-05-02 23:45:00,506 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2021-05-02 23:45:00,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:00,537 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2021-05-02 23:45:00,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 84 states have internal predecessors, (90), 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) [2021-05-02 23:45:00,537 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2021-05-02 23:45:00,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 23:45:00,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:00,538 INFO L523 BasicCegarLoop]: trace histogram [77, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:00,538 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-02 23:45:00,538 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:00,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:00,538 INFO L82 PathProgramCache]: Analyzing trace with hash -2136449660, now seen corresponding path program 77 times [2021-05-02 23:45:00,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:00,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [802146415] [2021-05-02 23:45:00,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:00,557 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3164 v_main_~n~0_85) InVars {main_~i~0=v_main_~i~0_3164, main_~n~0=v_main_~n~0_85} OutVars{main_~i~0=v_main_~i~0_3164, main_~n~0=v_main_~n~0_85} AuxVars[] AssignedVars[] [2021-05-02 23:45:00,559 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:45:00,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:00,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:45:00,644 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:45:00,718 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:00,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:01,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:01,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:01,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:45:01,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:01,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:45:01,182 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:45:15,883 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:45:15,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [802146415] [2021-05-02 23:45:15,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [802146415] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:45:15,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:45:15,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-02 23:45:15,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585905054] [2021-05-02 23:45:15,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-02 23:45:15,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:45:15,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-02 23:45:15,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=7574, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 23:45:15,885 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 87 states, 86 states have (on average 1.058139534883721) internal successors, (91), 85 states have internal predecessors, (91), 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) [2021-05-02 23:45:48,907 WARN L205 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 36 [2021-05-02 23:45:50,198 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2021-05-02 23:45:51,608 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 32 [2021-05-02 23:45:52,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:45:52,889 INFO L93 Difference]: Finished difference Result 116 states and 119 transitions. [2021-05-02 23:45:52,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-02 23:45:52,895 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 1.058139534883721) internal successors, (91), 85 states have internal predecessors, (91), 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 97 [2021-05-02 23:45:52,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:45:52,895 INFO L225 Difference]: With dead ends: 116 [2021-05-02 23:45:52,895 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 23:45:52,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4687 ImplicationChecksByTransitivity, 31189.8ms TimeCoverageRelationStatistics Valid=782, Invalid=29668, Unknown=0, NotChecked=0, Total=30450 [2021-05-02 23:45:52,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 23:45:52,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-02 23:45:52,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 93 states have (on average 1.021505376344086) internal successors, (95), 94 states have internal predecessors, (95), 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) [2021-05-02 23:45:52,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2021-05-02 23:45:52,906 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 97 [2021-05-02 23:45:52,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:45:52,906 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2021-05-02 23:45:52,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 86 states have (on average 1.058139534883721) internal successors, (91), 85 states have internal predecessors, (91), 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) [2021-05-02 23:45:52,906 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2021-05-02 23:45:52,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 23:45:52,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:45:52,907 INFO L523 BasicCegarLoop]: trace histogram [78, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:45:52,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-02 23:45:52,907 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:45:52,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:45:52,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1116137036, now seen corresponding path program 78 times [2021-05-02 23:45:52,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:45:52,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657175543] [2021-05-02 23:45:52,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:45:52,917 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3244 v_main_~n~0_86) InVars {main_~i~0=v_main_~i~0_3244, main_~n~0=v_main_~n~0_86} OutVars{main_~i~0=v_main_~i~0_3244, main_~n~0=v_main_~n~0_86} AuxVars[] AssignedVars[] [2021-05-02 23:45:52,919 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:45:52,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:45:52,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:45:53,017 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:45:53,091 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:45:53,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:53,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:45:53,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:53,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:45:53,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:45:53,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:45:53,595 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 15 [2021-05-02 23:46:09,689 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:46:09,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657175543] [2021-05-02 23:46:09,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1657175543] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:46:09,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:46:09,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-02 23:46:09,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000571624] [2021-05-02 23:46:09,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-02 23:46:09,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:46:09,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-02 23:46:09,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=7673, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 23:46:09,691 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 88 states, 87 states have (on average 1.0574712643678161) internal successors, (92), 86 states have internal predecessors, (92), 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) [2021-05-02 23:46:09,897 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-02 23:46:44,262 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 34 [2021-05-02 23:46:45,135 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 37 [2021-05-02 23:46:46,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:46:46,486 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2021-05-02 23:46:46,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-02 23:46:46,491 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.0574712643678161) internal successors, (92), 86 states have internal predecessors, (92), 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 98 [2021-05-02 23:46:46,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:46:46,492 INFO L225 Difference]: With dead ends: 117 [2021-05-02 23:46:46,492 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 23:46:46,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4619 ImplicationChecksByTransitivity, 32780.4ms TimeCoverageRelationStatistics Valid=945, Invalid=30207, Unknown=0, NotChecked=0, Total=31152 [2021-05-02 23:46:46,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 23:46:46,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2021-05-02 23:46:46,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 95 states have internal predecessors, (96), 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) [2021-05-02 23:46:46,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2021-05-02 23:46:46,502 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 98 [2021-05-02 23:46:46,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:46:46,503 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2021-05-02 23:46:46,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 87 states have (on average 1.0574712643678161) internal successors, (92), 86 states have internal predecessors, (92), 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) [2021-05-02 23:46:46,503 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2021-05-02 23:46:46,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 23:46:46,503 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:46:46,503 INFO L523 BasicCegarLoop]: trace histogram [79, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:46:46,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-02 23:46:46,503 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:46:46,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:46:46,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1132890492, now seen corresponding path program 79 times [2021-05-02 23:46:46,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:46:46,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406189438] [2021-05-02 23:46:46,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:46:46,511 INFO L181 rdanLoopAcceleration]: Guard: Formula: (< v_main_~i~0_3325 v_main_~n~0_87) InVars {main_~i~0=v_main_~i~0_3325, main_~n~0=v_main_~n~0_87} OutVars{main_~i~0=v_main_~i~0_3325, main_~n~0=v_main_~n~0_87} AuxVars[] AssignedVars[] [2021-05-02 23:46:46,513 WARN L240 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size [2021-05-02 23:46:46,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 23:46:46,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-02 23:46:46,599 WARN L245 tifierPushTermWalker]: treesize reduction 7, result has 89.2 percent of original size 58 [2021-05-02 23:46:46,659 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-02 23:46:46,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:46,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:46:46,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:46,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 23:46:46,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:46:46,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.